Merge commit 'v2.6.36-rc3' into x86/memblock

Conflicts:
	arch/x86/kernel/trampoline.c
	mm/memblock.c

Merge reason: Resolve the conflicts, update to latest upstream.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

109 files changed, 8887 insertions, 7136 deletions

diff --git a/kernel/Makefile b/kernel/Makefile
index 80e61c3e44ae..4c19ebe9053c 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -69,14 +69,15 @@ obj-$(CONFIG_IKCONFIG) += configs.o
 obj-$(CONFIG_RESOURCE_COUNTERS) += res_counter.o
 obj-$(CONFIG_SMP) += stop_machine.o
 obj-$(CONFIG_KPROBES_SANITY_TEST) += test_kprobes.o
-obj-$(CONFIG_AUDIT) += audit.o auditfilter.o audit_watch.o
+obj-$(CONFIG_AUDIT) += audit.o auditfilter.o
 obj-$(CONFIG_AUDITSYSCALL) += auditsc.o
-obj-$(CONFIG_GCOV_KERNEL) += gcov/
+obj-$(CONFIG_AUDIT_WATCH) += audit_watch.o
 obj-$(CONFIG_AUDIT_TREE) += audit_tree.o
+obj-$(CONFIG_GCOV_KERNEL) += gcov/
 obj-$(CONFIG_KPROBES) += kprobes.o
 obj-$(CONFIG_KGDB) += debug/
-obj-$(CONFIG_DETECT_SOFTLOCKUP) += softlockup.o
 obj-$(CONFIG_DETECT_HUNG_TASK) += hung_task.o
+obj-$(CONFIG_LOCKUP_DETECTOR) += watchdog.o
 obj-$(CONFIG_GENERIC_HARDIRQS) += irq/
 obj-$(CONFIG_SECCOMP) += seccomp.o
 obj-$(CONFIG_RCU_TORTURE_TEST) += rcutorture.o
@@ -98,8 +99,6 @@ obj-$(CONFIG_TRACING) += trace/
 obj-$(CONFIG_X86_DS) += trace/
 obj-$(CONFIG_RING_BUFFER) += trace/
 obj-$(CONFIG_SMP) += sched_cpupri.o
-obj-$(CONFIG_SLOW_WORK) += slow-work.o
-obj-$(CONFIG_SLOW_WORK_DEBUG) += slow-work-debugfs.o
 obj-$(CONFIG_PERF_EVENTS) += perf_event.o
 obj-$(CONFIG_HAVE_HW_BREAKPOINT) += hw_breakpoint.o
 obj-$(CONFIG_USER_RETURN_NOTIFIER) += user-return-notifier.o
diff --git a/kernel/acct.c b/kernel/acct.c
index 385b88461c29..fa7eb3de2ddc 100644
--- a/kernel/acct.c
+++ b/kernel/acct.c
@@ -122,7 +122,7 @@ static int check_free_space(struct bsd_acct_struct *acct, struct file *file)
         spin_unlock(&acct_lock);
 
         /* May block */
-        if (vfs_statfs(file->f_path.dentry, &sbuf))
+        if (vfs_statfs(&file->f_path, &sbuf))
                 return res;
         suspend = sbuf.f_blocks * SUSPEND;
         resume = sbuf.f_blocks * RESUME;
diff --git a/kernel/async.c b/kernel/async.c
index 15319d6c18fe..cd9dbb913c77 100644
--- a/kernel/async.c
+++ b/kernel/async.c
@@ -49,40 +49,33 @@ asynchronous and synchronous parts of the kernel.
 */
 
 #include <linux/async.h>
-#include <linux/bug.h>
 #include <linux/module.h>
 #include <linux/wait.h>
 #include <linux/sched.h>
-#include <linux/init.h>
-#include <linux/kthread.h>
-#include <linux/delay.h>
 #include <linux/slab.h>
+#include <linux/workqueue.h>
 #include <asm/atomic.h>
 
 static async_cookie_t next_cookie = 1;
 
-#define MAX_THREADS     256
 #define MAX_WORK        32768
 
 static LIST_HEAD(async_pending);
 static LIST_HEAD(async_running);
 static DEFINE_SPINLOCK(async_lock);
 
-static int async_enabled = 0;
-
 struct async_entry {
-        struct list_head list;
-        async_cookie_t   cookie;
-        async_func_ptr   *func;
-        void             *data;
-        struct list_head *running;
+        struct list_head        list;
+        struct work_struct      work;
+        async_cookie_t          cookie;
+        async_func_ptr          *func;
+        void                    *data;
+        struct list_head        *running;
 };
 
 static DECLARE_WAIT_QUEUE_HEAD(async_done);
-static DECLARE_WAIT_QUEUE_HEAD(async_new);
 
 static atomic_t entry_count;
-static atomic_t thread_count;
 
 extern int initcall_debug;
 
@@ -117,27 +110,23 @@ static async_cookie_t  lowest_in_progress(struct list_head *running)
         spin_unlock_irqrestore(&async_lock, flags);
         return ret;
 }
+
 /*
  * pick the first pending entry and run it
  */
-static void run_one_entry(void)
+static void async_run_entry_fn(struct work_struct *work)
 {
+        struct async_entry *entry =
+                container_of(work, struct async_entry, work);
         unsigned long flags;
-        struct async_entry *entry;
         ktime_t calltime, delta, rettime;
 
-        /* 1) pick one task from the pending queue */
-
+        /* 1) move self to the running queue */
         spin_lock_irqsave(&async_lock, flags);
-        if (list_empty(&async_pending))
-                goto out;
-        entry = list_first_entry(&async_pending, struct async_entry, list);
-
-        /* 2) move it to the running queue */
         list_move_tail(&entry->list, entry->running);
         spin_unlock_irqrestore(&async_lock, flags);
 
-        /* 3) run it (and print duration)*/
+        /* 2) run (and print duration) */
         if (initcall_debug && system_state == SYSTEM_BOOTING) {
                 printk("calling  %lli_%pF @ %i\n", (long long)entry->cookie,
                         entry->func, task_pid_nr(current));
@@ -153,31 +142,25 @@ static void run_one_entry(void)
                         (long long)ktime_to_ns(delta) >> 10);
         }
 
-        /* 4) remove it from the running queue */
+        /* 3) remove self from the running queue */
         spin_lock_irqsave(&async_lock, flags);
         list_del(&entry->list);
 
-        /* 5) free the entry  */
+        /* 4) free the entry */
         kfree(entry);
         atomic_dec(&entry_count);
 
         spin_unlock_irqrestore(&async_lock, flags);
 
-        /* 6) wake up any waiters. */
+        /* 5) wake up any waiters */
         wake_up(&async_done);
-        return;
-
-out:
-        spin_unlock_irqrestore(&async_lock, flags);
 }
 
-
 static async_cookie_t __async_schedule(async_func_ptr *ptr, void *data, struct list_head *running)
 {
         struct async_entry *entry;
         unsigned long flags;
         async_cookie_t newcookie;
-        
 
         /* allow irq-off callers */
         entry = kzalloc(sizeof(struct async_entry), GFP_ATOMIC);
@@ -186,7 +169,7 @@ static async_cookie_t __async_schedule(async_func_ptr *ptr, void *data, struct l
          * If we're out of memory or if there's too much work
          * pending already, we execute synchronously.
          */
-        if (!async_enabled || !entry || atomic_read(&entry_count) > MAX_WORK) {
+        if (!entry || atomic_read(&entry_count) > MAX_WORK) {
                 kfree(entry);
                 spin_lock_irqsave(&async_lock, flags);
                 newcookie = next_cookie++;
@@ -196,6 +179,7 @@ static async_cookie_t __async_schedule(async_func_ptr *ptr, void *data, struct l
                 ptr(data, newcookie);
                 return newcookie;
         }
+        INIT_WORK(&entry->work, async_run_entry_fn);
         entry->func = ptr;
         entry->data = data;
         entry->running = running;
@@ -205,7 +189,10 @@ static async_cookie_t __async_schedule(async_func_ptr *ptr, void *data, struct l
         list_add_tail(&entry->list, &async_pending);
         atomic_inc(&entry_count);
         spin_unlock_irqrestore(&async_lock, flags);
-        wake_up(&async_new);
+
+        /* schedule for execution */
+        queue_work(system_unbound_wq, &entry->work);
+
         return newcookie;
 }
 
@@ -312,87 +299,3 @@ void async_synchronize_cookie(async_cookie_t cookie)
         async_synchronize_cookie_domain(cookie, &async_running);
 }
 EXPORT_SYMBOL_GPL(async_synchronize_cookie);
-
-
-static int async_thread(void *unused)
-{
-        DECLARE_WAITQUEUE(wq, current);
-        add_wait_queue(&async_new, &wq);
-
-        while (!kthread_should_stop()) {
-                int ret = HZ;
-                set_current_state(TASK_INTERRUPTIBLE);
-                /*
-                 * check the list head without lock.. false positives
-                 * are dealt with inside run_one_entry() while holding
-                 * the lock.
-                 */
-                rmb();
-                if (!list_empty(&async_pending))
-                        run_one_entry();
-                else
-                        ret = schedule_timeout(HZ);
-
-                if (ret == 0) {
-                        /*
-                         * we timed out, this means we as thread are redundant.
-                         * we sign off and die, but we to avoid any races there
-                         * is a last-straw check to see if work snuck in.
-                         */
-                        atomic_dec(&thread_count);
-                        wmb(); /* manager must see our departure first */
-                        if (list_empty(&async_pending))
-                                break;
-                        /*
-                         * woops work came in between us timing out and us
-                         * signing off; we need to stay alive and keep working.
-                         */
-                        atomic_inc(&thread_count);
-                }
-        }
-        remove_wait_queue(&async_new, &wq);
-
-        return 0;
-}
-
-static int async_manager_thread(void *unused)
-{
-        DECLARE_WAITQUEUE(wq, current);
-        add_wait_queue(&async_new, &wq);
-
-        while (!kthread_should_stop()) {
-                int tc, ec;
-
-                set_current_state(TASK_INTERRUPTIBLE);
-
-                tc = atomic_read(&thread_count);
-                rmb();
-                ec = atomic_read(&entry_count);
-
-                while (tc < ec && tc < MAX_THREADS) {
-                        if (IS_ERR(kthread_run(async_thread, NULL, "async/%i",
-                                               tc))) {
-                                msleep(100);
-                                continue;
-                        }
-                        atomic_inc(&thread_count);
-                        tc++;
-                }
-
-                schedule();
-        }
-        remove_wait_queue(&async_new, &wq);
-
-        return 0;
-}
-
-static int __init async_init(void)
-{
-        async_enabled =
-                !IS_ERR(kthread_run(async_manager_thread, NULL, "async/mgr"));
-
-        WARN_ON(!async_enabled);
-        return 0;
-}
-
-core_initcall(async_init);
diff --git a/kernel/audit.c b/kernel/audit.c
index c71bd26631a2..d96045789b54 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -56,7 +56,6 @@
 #include <net/netlink.h>
 #include <linux/skbuff.h>
 #include <linux/netlink.h>
-#include <linux/inotify.h>
 #include <linux/freezer.h>
 #include <linux/tty.h>
 
@@ -407,7 +406,7 @@ static void kauditd_send_skb(struct sk_buff *skb)
                 audit_hold_skb(skb);
         } else
                 /* drop the extra reference if sent ok */
-                kfree_skb(skb);
+                consume_skb(skb);
 }
 
 static int kauditd_thread(void *dummy)
diff --git a/kernel/audit.h b/kernel/audit.h
index 208687be4f30..f7206db4e13d 100644
--- a/kernel/audit.h
+++ b/kernel/audit.h
@@ -103,21 +103,27 @@ extern struct mutex audit_filter_mutex;
 extern void audit_free_rule_rcu(struct rcu_head *);
 extern struct list_head audit_filter_list[];
 
+extern struct audit_entry *audit_dupe_rule(struct audit_krule *old);
+
 /* audit watch functions */
-extern unsigned long audit_watch_inode(struct audit_watch *watch);
-extern dev_t audit_watch_dev(struct audit_watch *watch);
+#ifdef CONFIG_AUDIT_WATCH
 extern void audit_put_watch(struct audit_watch *watch);
 extern void audit_get_watch(struct audit_watch *watch);
 extern int audit_to_watch(struct audit_krule *krule, char *path, int len, u32 op);
-extern int audit_add_watch(struct audit_krule *krule);
-extern void audit_remove_watch(struct audit_watch *watch);
-extern void audit_remove_watch_rule(struct audit_krule *krule, struct list_head *list);
-extern void audit_inotify_unregister(struct list_head *in_list);
+extern int audit_add_watch(struct audit_krule *krule, struct list_head **list);
+extern void audit_remove_watch_rule(struct audit_krule *krule);
 extern char *audit_watch_path(struct audit_watch *watch);
-extern struct list_head *audit_watch_rules(struct audit_watch *watch);
-
-extern struct audit_entry *audit_dupe_rule(struct audit_krule *old,
-                                           struct audit_watch *watch);
+extern int audit_watch_compare(struct audit_watch *watch, unsigned long ino, dev_t dev);
+#else
+#define audit_put_watch(w) {}
+#define audit_get_watch(w) {}
+#define audit_to_watch(k, p, l, o) (-EINVAL)
+#define audit_add_watch(k, l) (-EINVAL)
+#define audit_remove_watch_rule(k) BUG()
+#define audit_watch_path(w) ""
+#define audit_watch_compare(w, i, d) 0
+
+#endif /* CONFIG_AUDIT_WATCH */
 
 #ifdef CONFIG_AUDIT_TREE
 extern struct audit_chunk *audit_tree_lookup(const struct inode *);
diff --git a/kernel/audit_tree.c b/kernel/audit_tree.c
index 46a57b57a335..7f18d3a4527e 100644
--- a/kernel/audit_tree.c
+++ b/kernel/audit_tree.c
@@ -1,5 +1,5 @@
 #include "audit.h"
-#include <linux/inotify.h>
+#include <linux/fsnotify_backend.h>
 #include <linux/namei.h>
 #include <linux/mount.h>
 #include <linux/kthread.h>
@@ -22,7 +22,7 @@ struct audit_tree {
 
 struct audit_chunk {
         struct list_head hash;
-        struct inotify_watch watch;
+        struct fsnotify_mark mark;
         struct list_head trees;         /* with root here */
         int dead;
         int count;
@@ -59,7 +59,7 @@ static LIST_HEAD(prune_list);
  * tree is refcounted; one reference for "some rules on rules_list refer to
  * it", one for each chunk with pointer to it.
  *
- * chunk is refcounted by embedded inotify_watch + .refs (non-zero refcount
+ * chunk is refcounted by embedded fsnotify_mark + .refs (non-zero refcount
  * of watch contributes 1 to .refs).
  *
  * node.index allows to get from node.list to containing chunk.
@@ -68,7 +68,7 @@ static LIST_HEAD(prune_list);
  * that makes a difference.  Some.
  */
 
-static struct inotify_handle *rtree_ih;
+static struct fsnotify_group *audit_tree_group;
 
 static struct audit_tree *alloc_tree(const char *s)
 {
@@ -111,29 +111,6 @@ const char *audit_tree_path(struct audit_tree *tree)
         return tree->pathname;
 }
 
-static struct audit_chunk *alloc_chunk(int count)
-{
-        struct audit_chunk *chunk;
-        size_t size;
-        int i;
-
-        size = offsetof(struct audit_chunk, owners) + count * sizeof(struct node);
-        chunk = kzalloc(size, GFP_KERNEL);
-        if (!chunk)
-                return NULL;
-
-        INIT_LIST_HEAD(&chunk->hash);
-        INIT_LIST_HEAD(&chunk->trees);
-        chunk->count = count;
-        atomic_long_set(&chunk->refs, 1);
-        for (i = 0; i < count; i++) {
-                INIT_LIST_HEAD(&chunk->owners[i].list);
-                chunk->owners[i].index = i;
-        }
-        inotify_init_watch(&chunk->watch);
-        return chunk;
-}
-
 static void free_chunk(struct audit_chunk *chunk)
 {
         int i;
@@ -157,6 +134,35 @@ static void __put_chunk(struct rcu_head *rcu)
         audit_put_chunk(chunk);
 }
 
+static void audit_tree_destroy_watch(struct fsnotify_mark *entry)
+{
+        struct audit_chunk *chunk = container_of(entry, struct audit_chunk, mark);
+        call_rcu(&chunk->head, __put_chunk);
+}
+
+static struct audit_chunk *alloc_chunk(int count)
+{
+        struct audit_chunk *chunk;
+        size_t size;
+        int i;
+
+        size = offsetof(struct audit_chunk, owners) + count * sizeof(struct node);
+        chunk = kzalloc(size, GFP_KERNEL);
+        if (!chunk)
+                return NULL;
+
+        INIT_LIST_HEAD(&chunk->hash);
+        INIT_LIST_HEAD(&chunk->trees);
+        chunk->count = count;
+        atomic_long_set(&chunk->refs, 1);
+        for (i = 0; i < count; i++) {
+                INIT_LIST_HEAD(&chunk->owners[i].list);
+                chunk->owners[i].index = i;
+        }
+        fsnotify_init_mark(&chunk->mark, audit_tree_destroy_watch);
+        return chunk;
+}
+
 enum {HASH_SIZE = 128};
 static struct list_head chunk_hash_heads[HASH_SIZE];
 static __cacheline_aligned_in_smp DEFINE_SPINLOCK(hash_lock);
@@ -167,10 +173,15 @@ static inline struct list_head *chunk_hash(const struct inode *inode)
         return chunk_hash_heads + n % HASH_SIZE;
 }
 
-/* hash_lock is held by caller */
+/* hash_lock & entry->lock is held by caller */
 static void insert_hash(struct audit_chunk *chunk)
 {
-        struct list_head *list = chunk_hash(chunk->watch.inode);
+        struct fsnotify_mark *entry = &chunk->mark;
+        struct list_head *list;
+
+        if (!entry->i.inode)
+                return;
+        list = chunk_hash(entry->i.inode);
         list_add_rcu(&chunk->hash, list);
 }
 
@@ -181,7 +192,8 @@ struct audit_chunk *audit_tree_lookup(const struct inode *inode)
         struct audit_chunk *p;
 
         list_for_each_entry_rcu(p, list, hash) {
-                if (p->watch.inode == inode) {
+                /* mark.inode may have gone NULL, but who cares? */
+                if (p->mark.i.inode == inode) {
                         atomic_long_inc(&p->refs);
                         return p;
                 }
@@ -210,38 +222,19 @@ static struct audit_chunk *find_chunk(struct node *p)
 static void untag_chunk(struct node *p)
 {
         struct audit_chunk *chunk = find_chunk(p);
+        struct fsnotify_mark *entry = &chunk->mark;
         struct audit_chunk *new;
         struct audit_tree *owner;
         int size = chunk->count - 1;
         int i, j;
 
-        if (!pin_inotify_watch(&chunk->watch)) {
-                /*
-                 * Filesystem is shutting down; all watches are getting
-                 * evicted, just take it off the node list for this
-                 * tree and let the eviction logics take care of the
-                 * rest.
-                 */
-                owner = p->owner;
-                if (owner->root == chunk) {
-                        list_del_init(&owner->same_root);
-                        owner->root = NULL;
-                }
-                list_del_init(&p->list);
-                p->owner = NULL;
-                put_tree(owner);
-                return;
-        }
+        fsnotify_get_mark(entry);
 
         spin_unlock(&hash_lock);
 
-        /*
-         * pin_inotify_watch() succeeded, so the watch won't go away
-         * from under us.
-         */
-        mutex_lock(&chunk->watch.inode->inotify_mutex);
-        if (chunk->dead) {
-                mutex_unlock(&chunk->watch.inode->inotify_mutex);
+        spin_lock(&entry->lock);
+        if (chunk->dead || !entry->i.inode) {
+                spin_unlock(&entry->lock);
                 goto out;
         }
 
@@ -256,16 +249,17 @@ static void untag_chunk(struct node *p)
                 list_del_init(&p->list);
                 list_del_rcu(&chunk->hash);
                 spin_unlock(&hash_lock);
-                inotify_evict_watch(&chunk->watch);
-                mutex_unlock(&chunk->watch.inode->inotify_mutex);
-                put_inotify_watch(&chunk->watch);
+                spin_unlock(&entry->lock);
+                fsnotify_destroy_mark(entry);
+                fsnotify_put_mark(entry);
                 goto out;
         }
 
         new = alloc_chunk(size);
         if (!new)
                 goto Fallback;
-        if (inotify_clone_watch(&chunk->watch, &new->watch) < 0) {
+        fsnotify_duplicate_mark(&new->mark, entry);
+        if (fsnotify_add_mark(&new->mark, new->mark.group, new->mark.i.inode, NULL, 1)) {
                 free_chunk(new);
                 goto Fallback;
         }
@@ -298,9 +292,9 @@ static void untag_chunk(struct node *p)
         list_for_each_entry(owner, &new->trees, same_root)
                 owner->root = new;
         spin_unlock(&hash_lock);
-        inotify_evict_watch(&chunk->watch);
-        mutex_unlock(&chunk->watch.inode->inotify_mutex);
-        put_inotify_watch(&chunk->watch);
+        spin_unlock(&entry->lock);
+        fsnotify_destroy_mark(entry);
+        fsnotify_put_mark(entry);
         goto out;
 
 Fallback:
@@ -314,31 +308,33 @@ Fallback:
         p->owner = NULL;
         put_tree(owner);
         spin_unlock(&hash_lock);
-        mutex_unlock(&chunk->watch.inode->inotify_mutex);
+        spin_unlock(&entry->lock);
 out:
-        unpin_inotify_watch(&chunk->watch);
+        fsnotify_put_mark(entry);
         spin_lock(&hash_lock);
 }
 
 static int create_chunk(struct inode *inode, struct audit_tree *tree)
 {
+        struct fsnotify_mark *entry;
         struct audit_chunk *chunk = alloc_chunk(1);
         if (!chunk)
                 return -ENOMEM;
 
-        if (inotify_add_watch(rtree_ih, &chunk->watch, inode, IN_IGNORED | IN_DELETE_SELF) < 0) {
+        entry = &chunk->mark;
+        if (fsnotify_add_mark(entry, audit_tree_group, inode, NULL, 0)) {
                 free_chunk(chunk);
                 return -ENOSPC;
         }
 
-        mutex_lock(&inode->inotify_mutex);
+        spin_lock(&entry->lock);
         spin_lock(&hash_lock);
         if (tree->goner) {
                 spin_unlock(&hash_lock);
                 chunk->dead = 1;
-                inotify_evict_watch(&chunk->watch);
-                mutex_unlock(&inode->inotify_mutex);
-                put_inotify_watch(&chunk->watch);
+                spin_unlock(&entry->lock);
+                fsnotify_destroy_mark(entry);
+                fsnotify_put_mark(entry);
                 return 0;
         }
         chunk->owners[0].index = (1U << 31);
@@ -351,30 +347,31 @@ static int create_chunk(struct inode *inode, struct audit_tree *tree)
         }
         insert_hash(chunk);
         spin_unlock(&hash_lock);
-        mutex_unlock(&inode->inotify_mutex);
+        spin_unlock(&entry->lock);
         return 0;
 }
 
 /* the first tagged inode becomes root of tree */
 static int tag_chunk(struct inode *inode, struct audit_tree *tree)
 {
-        struct inotify_watch *watch;
+        struct fsnotify_mark *old_entry, *chunk_entry;
         struct audit_tree *owner;
         struct audit_chunk *chunk, *old;
         struct node *p;
         int n;
 
-        if (inotify_find_watch(rtree_ih, inode, &watch) < 0)
+        old_entry = fsnotify_find_inode_mark(audit_tree_group, inode);
+        if (!old_entry)
                 return create_chunk(inode, tree);
 
-        old = container_of(watch, struct audit_chunk, watch);
+        old = container_of(old_entry, struct audit_chunk, mark);
 
         /* are we already there? */
         spin_lock(&hash_lock);
         for (n = 0; n < old->count; n++) {
                 if (old->owners[n].owner == tree) {
                         spin_unlock(&hash_lock);
-                        put_inotify_watch(&old->watch);
+                        fsnotify_put_mark(old_entry);
                         return 0;
                 }
         }
@@ -382,25 +379,44 @@ static int tag_chunk(struct inode *inode, struct audit_tree *tree)
 
         chunk = alloc_chunk(old->count + 1);
         if (!chunk) {
-                put_inotify_watch(&old->watch);
+                fsnotify_put_mark(old_entry);
                 return -ENOMEM;
         }
 
-        mutex_lock(&inode->inotify_mutex);
-        if (inotify_clone_watch(&old->watch, &chunk->watch) < 0) {
-                mutex_unlock(&inode->inotify_mutex);
-                put_inotify_watch(&old->watch);
+        chunk_entry = &chunk->mark;
+
+        spin_lock(&old_entry->lock);
+        if (!old_entry->i.inode) {
+                /* old_entry is being shot, lets just lie */
+                spin_unlock(&old_entry->lock);
+                fsnotify_put_mark(old_entry);
                 free_chunk(chunk);
+                return -ENOENT;
+        }
+
+        fsnotify_duplicate_mark(chunk_entry, old_entry);
+        if (fsnotify_add_mark(chunk_entry, chunk_entry->group, chunk_entry->i.inode, NULL, 1)) {
+                spin_unlock(&old_entry->lock);
+                free_chunk(chunk);
+                fsnotify_put_mark(old_entry);
                 return -ENOSPC;
         }
+
+        /* even though we hold old_entry->lock, this is safe since chunk_entry->lock could NEVER have been grabbed before */
+        spin_lock(&chunk_entry->lock);
         spin_lock(&hash_lock);
+
+        /* we now hold old_entry->lock, chunk_entry->lock, and hash_lock */
         if (tree->goner) {
                 spin_unlock(&hash_lock);
                 chunk->dead = 1;
-                inotify_evict_watch(&chunk->watch);
-                mutex_unlock(&inode->inotify_mutex);
-                put_inotify_watch(&old->watch);
-                put_inotify_watch(&chunk->watch);
+                spin_unlock(&chunk_entry->lock);
+                spin_unlock(&old_entry->lock);
+
+                fsnotify_destroy_mark(chunk_entry);
+
+                fsnotify_put_mark(chunk_entry);
+                fsnotify_put_mark(old_entry);
                 return 0;
         }
         list_replace_init(&old->trees, &chunk->trees);
@@ -426,10 +442,11 @@ static int tag_chunk(struct inode *inode, struct audit_tree *tree)
                 list_add(&tree->same_root, &chunk->trees);
         }
         spin_unlock(&hash_lock);
-        inotify_evict_watch(&old->watch);
-        mutex_unlock(&inode->inotify_mutex);
-        put_inotify_watch(&old->watch); /* pair to inotify_find_watch */
-        put_inotify_watch(&old->watch); /* and kill it */
+        spin_unlock(&chunk_entry->lock);
+        spin_unlock(&old_entry->lock);
+        fsnotify_destroy_mark(old_entry);
+        fsnotify_put_mark(old_entry); /* pair to fsnotify_find mark_entry */
+        fsnotify_put_mark(old_entry); /* and kill it */
         return 0;
 }
 
@@ -584,7 +601,9 @@ void audit_trim_trees(void)
 
                 spin_lock(&hash_lock);
                 list_for_each_entry(node, &tree->chunks, list) {
-                        struct inode *inode = find_chunk(node)->watch.inode;
+                        struct audit_chunk *chunk = find_chunk(node);
+                        /* this could be NULL if the watch is dieing else where... */
+                        struct inode *inode = chunk->mark.i.inode;
                         node->index |= 1U<<31;
                         if (iterate_mounts(compare_root, inode, root_mnt))
                                 node->index &= ~(1U<<31);
@@ -846,7 +865,6 @@ void audit_kill_trees(struct list_head *list)
  *  Here comes the stuff asynchronous to auditctl operations
  */
 
-/* inode->inotify_mutex is locked */
 static void evict_chunk(struct audit_chunk *chunk)
 {
         struct audit_tree *owner;
@@ -885,35 +903,46 @@ static void evict_chunk(struct audit_chunk *chunk)
         mutex_unlock(&audit_filter_mutex);
 }
 
-static void handle_event(struct inotify_watch *watch, u32 wd, u32 mask,
-                         u32 cookie, const char *dname, struct inode *inode)
+static int audit_tree_handle_event(struct fsnotify_group *group,
+                                   struct fsnotify_mark *inode_mark,
+                                   struct fsnotify_mark *vfsmonut_mark,
+                                   struct fsnotify_event *event)
+{
+        BUG();
+        return -EOPNOTSUPP;
+}
+
+static void audit_tree_freeing_mark(struct fsnotify_mark *entry, struct fsnotify_group *group)
 {
-        struct audit_chunk *chunk = container_of(watch, struct audit_chunk, watch);
+        struct audit_chunk *chunk = container_of(entry, struct audit_chunk, mark);
 
-        if (mask & IN_IGNORED) {
-                evict_chunk(chunk);
-                put_inotify_watch(watch);
-        }
+        evict_chunk(chunk);
+        fsnotify_put_mark(entry);
 }
 
-static void destroy_watch(struct inotify_watch *watch)
+static bool audit_tree_send_event(struct fsnotify_group *group, struct inode *inode,
+                                  struct fsnotify_mark *inode_mark,
+                                  struct fsnotify_mark *vfsmount_mark,
+                                  __u32 mask, void *data, int data_type)
 {
-        struct audit_chunk *chunk = container_of(watch, struct audit_chunk, watch);
-        call_rcu(&chunk->head, __put_chunk);
+        return false;
 }
 
-static const struct inotify_operations rtree_inotify_ops = {
-        .handle_event   = handle_event,
-        .destroy_watch  = destroy_watch,
+static const struct fsnotify_ops audit_tree_ops = {
+        .handle_event = audit_tree_handle_event,
+        .should_send_event = audit_tree_send_event,
+        .free_group_priv = NULL,
+        .free_event_priv = NULL,
+        .freeing_mark = audit_tree_freeing_mark,
 };
 
 static int __init audit_tree_init(void)
 {
         int i;
 
-        rtree_ih = inotify_init(&rtree_inotify_ops);
-        if (IS_ERR(rtree_ih))
-                audit_panic("cannot initialize inotify handle for rectree watches");
+        audit_tree_group = fsnotify_alloc_group(&audit_tree_ops);
+        if (IS_ERR(audit_tree_group))
+                audit_panic("cannot initialize fsnotify group for rectree watches");
 
         for (i = 0; i < HASH_SIZE; i++)
                 INIT_LIST_HEAD(&chunk_hash_heads[i]);
diff --git a/kernel/audit_watch.c b/kernel/audit_watch.c
index 8df43696f4ba..f0c9b2e7542d 100644
--- a/kernel/audit_watch.c
+++ b/kernel/audit_watch.c
@@ -24,18 +24,18 @@
 #include <linux/kthread.h>
 #include <linux/mutex.h>
 #include <linux/fs.h>
+#include <linux/fsnotify_backend.h>
 #include <linux/namei.h>
 #include <linux/netlink.h>
 #include <linux/sched.h>
 #include <linux/slab.h>
-#include <linux/inotify.h>
 #include <linux/security.h>
 #include "audit.h"
 
 /*
  * Reference counting:
  *
- * audit_parent: lifetime is from audit_init_parent() to receipt of an IN_IGNORED
+ * audit_parent: lifetime is from audit_init_parent() to receipt of an FS_IGNORED
  *      event.  Each audit_watch holds a reference to its associated parent.
  *
  * audit_watch: if added to lists, lifetime is from audit_init_watch() to
@@ -51,40 +51,61 @@ struct audit_watch {
         unsigned long           ino;    /* associated inode number */
         struct audit_parent     *parent; /* associated parent */
         struct list_head        wlist;  /* entry in parent->watches list */
-        struct list_head        rules;  /* associated rules */
+        struct list_head        rules;  /* anchor for krule->rlist */
 };
 
 struct audit_parent {
-        struct list_head        ilist;  /* entry in inotify registration list */
-        struct list_head        watches; /* associated watches */
-        struct inotify_watch    wdata;  /* inotify watch data */
-        unsigned                flags;  /* status flags */
+        struct list_head        watches; /* anchor for audit_watch->wlist */
+        struct fsnotify_mark mark; /* fsnotify mark on the inode */
 };
 
-/* Inotify handle. */
-struct inotify_handle *audit_ih;
+/* fsnotify handle. */
+struct fsnotify_group *audit_watch_group;
 
-/*
- * audit_parent status flags:
- *
- * AUDIT_PARENT_INVALID - set anytime rules/watches are auto-removed due to
- * a filesystem event to ensure we're adding audit watches to a valid parent.
- * Technically not needed for IN_DELETE_SELF or IN_UNMOUNT events, as we cannot
- * receive them while we have nameidata, but must be used for IN_MOVE_SELF which
- * we can receive while holding nameidata.
- */
-#define AUDIT_PARENT_INVALID    0x001
+/* fsnotify events we care about. */
+#define AUDIT_FS_WATCH (FS_MOVE | FS_CREATE | FS_DELETE | FS_DELETE_SELF |\
+                        FS_MOVE_SELF | FS_EVENT_ON_CHILD)
 
-/* Inotify events we care about. */
-#define AUDIT_IN_WATCH IN_MOVE|IN_CREATE|IN_DELETE|IN_DELETE_SELF|IN_MOVE_SELF
+static void audit_free_parent(struct audit_parent *parent)
+{
+        WARN_ON(!list_empty(&parent->watches));
+        kfree(parent);
+}
 
-static void audit_free_parent(struct inotify_watch *i_watch)
+static void audit_watch_free_mark(struct fsnotify_mark *entry)
 {
         struct audit_parent *parent;
 
-        parent = container_of(i_watch, struct audit_parent, wdata);
-        WARN_ON(!list_empty(&parent->watches));
-        kfree(parent);
+        parent = container_of(entry, struct audit_parent, mark);
+        audit_free_parent(parent);
+}
+
+static void audit_get_parent(struct audit_parent *parent)
+{
+        if (likely(parent))
+                fsnotify_get_mark(&parent->mark);
+}
+
+static void audit_put_parent(struct audit_parent *parent)
+{
+        if (likely(parent))
+                fsnotify_put_mark(&parent->mark);
+}
+
+/*
+ * Find and return the audit_parent on the given inode.  If found a reference
+ * is taken on this parent.
+ */
+static inline struct audit_parent *audit_find_parent(struct inode *inode)
+{
+        struct audit_parent *parent = NULL;
+        struct fsnotify_mark *entry;
+
+        entry = fsnotify_find_inode_mark(audit_watch_group, inode);
+        if (entry)
+                parent = container_of(entry, struct audit_parent, mark);
+
+        return parent;
 }
 
 void audit_get_watch(struct audit_watch *watch)
@@ -105,7 +126,7 @@ void audit_put_watch(struct audit_watch *watch)
 void audit_remove_watch(struct audit_watch *watch)
 {
         list_del(&watch->wlist);
-        put_inotify_watch(&watch->parent->wdata);
+        audit_put_parent(watch->parent);
         watch->parent = NULL;
         audit_put_watch(watch); /* match initial get */
 }
@@ -115,42 +136,32 @@ char *audit_watch_path(struct audit_watch *watch)
         return watch->path;
 }
 
-struct list_head *audit_watch_rules(struct audit_watch *watch)
-{
-        return &watch->rules;
-}
-
-unsigned long audit_watch_inode(struct audit_watch *watch)
+int audit_watch_compare(struct audit_watch *watch, unsigned long ino, dev_t dev)
 {
-        return watch->ino;
-}
-
-dev_t audit_watch_dev(struct audit_watch *watch)
-{
-        return watch->dev;
+        return (watch->ino != (unsigned long)-1) &&
+                (watch->ino == ino) &&
+                (watch->dev == dev);
 }
 
 /* Initialize a parent watch entry. */
 static struct audit_parent *audit_init_parent(struct nameidata *ndp)
 {
+        struct inode *inode = ndp->path.dentry->d_inode;
         struct audit_parent *parent;
-        s32 wd;
+        int ret;
 
         parent = kzalloc(sizeof(*parent), GFP_KERNEL);
         if (unlikely(!parent))
                 return ERR_PTR(-ENOMEM);
 
         INIT_LIST_HEAD(&parent->watches);
-        parent->flags = 0;
-
-        inotify_init_watch(&parent->wdata);
-        /* grab a ref so inotify watch hangs around until we take audit_filter_mutex */
-        get_inotify_watch(&parent->wdata);
-        wd = inotify_add_watch(audit_ih, &parent->wdata,
-                               ndp->path.dentry->d_inode, AUDIT_IN_WATCH);
-        if (wd < 0) {
-                audit_free_parent(&parent->wdata);
-                return ERR_PTR(wd);
+
+        fsnotify_init_mark(&parent->mark, audit_watch_free_mark);
+        parent->mark.mask = AUDIT_FS_WATCH;
+        ret = fsnotify_add_mark(&parent->mark, audit_watch_group, inode, NULL, 0);
+        if (ret < 0) {
+                audit_free_parent(parent);
+                return ERR_PTR(ret);
         }
 
         return parent;
@@ -179,7 +190,7 @@ int audit_to_watch(struct audit_krule *krule, char *path, int len, u32 op)
 {
         struct audit_watch *watch;
 
-        if (!audit_ih)
+        if (!audit_watch_group)
                 return -EOPNOTSUPP;
 
         if (path[0] != '/' || path[len-1] == '/' ||
@@ -217,7 +228,7 @@ static struct audit_watch *audit_dupe_watch(struct audit_watch *old)
 
         new->dev = old->dev;
         new->ino = old->ino;
-        get_inotify_watch(&old->parent->wdata);
+        audit_get_parent(old->parent);
         new->parent = old->parent;
 
 out:
@@ -251,15 +262,19 @@ static void audit_update_watch(struct audit_parent *parent,
         struct audit_entry *oentry, *nentry;
 
         mutex_lock(&audit_filter_mutex);
+        /* Run all of the watches on this parent looking for the one that
+         * matches the given dname */
         list_for_each_entry_safe(owatch, nextw, &parent->watches, wlist) {
                 if (audit_compare_dname_path(dname, owatch->path, NULL))
                         continue;
 
                 /* If the update involves invalidating rules, do the inode-based
                  * filtering now, so we don't omit records. */
-                if (invalidating && current->audit_context)
+                if (invalidating && !audit_dummy_context())
                         audit_filter_inodes(current, current->audit_context);
 
+                /* updating ino will likely change which audit_hash_list we
+                 * are on so we need a new watch for the new list */
                 nwatch = audit_dupe_watch(owatch);
                 if (IS_ERR(nwatch)) {
                         mutex_unlock(&audit_filter_mutex);
@@ -275,12 +290,21 @@ static void audit_update_watch(struct audit_parent *parent,
                         list_del(&oentry->rule.rlist);
                         list_del_rcu(&oentry->list);
 
-                        nentry = audit_dupe_rule(&oentry->rule, nwatch);
+                        nentry = audit_dupe_rule(&oentry->rule);
                         if (IS_ERR(nentry)) {
                                 list_del(&oentry->rule.list);
                                 audit_panic("error updating watch, removing");
                         } else {
                                 int h = audit_hash_ino((u32)ino);
+
+                                /*
+                                 * nentry->rule.watch == oentry->rule.watch so
+                                 * we must drop that reference and set it to our
+                                 * new watch.
+                                 */
+                                audit_put_watch(nentry->rule.watch);
+                                audit_get_watch(nwatch);
+                                nentry->rule.watch = nwatch;
                                 list_add(&nentry->rule.rlist, &nwatch->rules);
                                 list_add_rcu(&nentry->list, &audit_inode_hash[h]);
                                 list_replace(&oentry->rule.list,
@@ -312,7 +336,6 @@ static void audit_remove_parent_watches(struct audit_parent *parent)
         struct audit_entry *e;
 
         mutex_lock(&audit_filter_mutex);
-        parent->flags |= AUDIT_PARENT_INVALID;
         list_for_each_entry_safe(w, nextw, &parent->watches, wlist) {
                 list_for_each_entry_safe(r, nextr, &w->rules, rlist) {
                         e = container_of(r, struct audit_entry, rule);
@@ -325,20 +348,8 @@ static void audit_remove_parent_watches(struct audit_parent *parent)
                 audit_remove_watch(w);
         }
         mutex_unlock(&audit_filter_mutex);
-}
-
-/* Unregister inotify watches for parents on in_list.
- * Generates an IN_IGNORED event. */
-void audit_inotify_unregister(struct list_head *in_list)
-{
-        struct audit_parent *p, *n;
 
-        list_for_each_entry_safe(p, n, in_list, ilist) {
-                list_del(&p->ilist);
-                inotify_rm_watch(audit_ih, &p->wdata);
-                /* the unpin matching the pin in audit_do_del_rule() */
-                unpin_inotify_watch(&p->wdata);
-        }
+        fsnotify_destroy_mark(&parent->mark);
 }
 
 /* Get path information necessary for adding watches. */
@@ -389,7 +400,7 @@ static void audit_put_nd(struct nameidata *ndp, struct nameidata *ndw)
         }
 }
 
-/* Associate the given rule with an existing parent inotify_watch.
+/* Associate the given rule with an existing parent.
  * Caller must hold audit_filter_mutex. */
 static void audit_add_to_parent(struct audit_krule *krule,
                                 struct audit_parent *parent)
@@ -397,6 +408,8 @@ static void audit_add_to_parent(struct audit_krule *krule,
         struct audit_watch *w, *watch = krule->watch;
         int watch_found = 0;
 
+        BUG_ON(!mutex_is_locked(&audit_filter_mutex));
+
         list_for_each_entry(w, &parent->watches, wlist) {
                 if (strcmp(watch->path, w->path))
                         continue;
@@ -413,7 +426,7 @@ static void audit_add_to_parent(struct audit_krule *krule,
         }
 
         if (!watch_found) {
-                get_inotify_watch(&parent->wdata);
+                audit_get_parent(parent);
                 watch->parent = parent;
 
                 list_add(&watch->wlist, &parent->watches);
@@ -423,13 +436,12 @@ static void audit_add_to_parent(struct audit_krule *krule,
 
 /* Find a matching watch entry, or add this one.
  * Caller must hold audit_filter_mutex. */
-int audit_add_watch(struct audit_krule *krule)
+int audit_add_watch(struct audit_krule *krule, struct list_head **list)
 {
         struct audit_watch *watch = krule->watch;
-        struct inotify_watch *i_watch;
         struct audit_parent *parent;
         struct nameidata *ndp = NULL, *ndw = NULL;
-        int ret = 0;
+        int h, ret = 0;
 
         mutex_unlock(&audit_filter_mutex);
 
@@ -441,47 +453,38 @@ int audit_add_watch(struct audit_krule *krule)
                 goto error;
         }
 
+        mutex_lock(&audit_filter_mutex);
+
         /* update watch filter fields */
         if (ndw) {
                 watch->dev = ndw->path.dentry->d_inode->i_sb->s_dev;
                 watch->ino = ndw->path.dentry->d_inode->i_ino;
         }
 
-        /* The audit_filter_mutex must not be held during inotify calls because
-         * we hold it during inotify event callback processing.  If an existing
-         * inotify watch is found, inotify_find_watch() grabs a reference before
-         * returning.
-         */
-        if (inotify_find_watch(audit_ih, ndp->path.dentry->d_inode,
-                               &i_watch) < 0) {
+        /* either find an old parent or attach a new one */
+        parent = audit_find_parent(ndp->path.dentry->d_inode);
+        if (!parent) {
                 parent = audit_init_parent(ndp);
                 if (IS_ERR(parent)) {
-                        /* caller expects mutex locked */
-                        mutex_lock(&audit_filter_mutex);
                         ret = PTR_ERR(parent);
                         goto error;
                 }
-        } else
-                parent = container_of(i_watch, struct audit_parent, wdata);
-
-        mutex_lock(&audit_filter_mutex);
+        }
 
-        /* parent was moved before we took audit_filter_mutex */
-        if (parent->flags & AUDIT_PARENT_INVALID)
-                ret = -ENOENT;
-        else
-                audit_add_to_parent(krule, parent);
+        audit_add_to_parent(krule, parent);
 
-        /* match get in audit_init_parent or inotify_find_watch */
-        put_inotify_watch(&parent->wdata);
+        /* match get in audit_find_parent or audit_init_parent */
+        audit_put_parent(parent);
 
+        h = audit_hash_ino((u32)watch->ino);
+        *list = &audit_inode_hash[h];
 error:
         audit_put_nd(ndp, ndw);         /* NULL args OK */
         return ret;
 
 }
 
-void audit_remove_watch_rule(struct audit_krule *krule, struct list_head *list)
+void audit_remove_watch_rule(struct audit_krule *krule)
 {
         struct audit_watch *watch = krule->watch;
         struct audit_parent *parent = watch->parent;
@@ -492,53 +495,74 @@ void audit_remove_watch_rule(struct audit_krule *krule, struct list_head *list)
                 audit_remove_watch(watch);
 
                 if (list_empty(&parent->watches)) {
-                        /* Put parent on the inotify un-registration
-                         * list.  Grab a reference before releasing
-                         * audit_filter_mutex, to be released in
-                         * audit_inotify_unregister().
-                         * If filesystem is going away, just leave
-                         * the sucker alone, eviction will take
-                         * care of it. */
-                        if (pin_inotify_watch(&parent->wdata))
-                                list_add(&parent->ilist, list);
+                        audit_get_parent(parent);
+                        fsnotify_destroy_mark(&parent->mark);
+                        audit_put_parent(parent);
                 }
         }
 }
 
-/* Update watch data in audit rules based on inotify events. */
-static void audit_handle_ievent(struct inotify_watch *i_watch, u32 wd, u32 mask,
-                         u32 cookie, const char *dname, struct inode *inode)
+static bool audit_watch_should_send_event(struct fsnotify_group *group, struct inode *inode,
+                                          struct fsnotify_mark *inode_mark,
+                                          struct fsnotify_mark *vfsmount_mark,
+                                          __u32 mask, void *data, int data_type)
+{
+       return true;
+}
+
+/* Update watch data in audit rules based on fsnotify events. */
+static int audit_watch_handle_event(struct fsnotify_group *group,
+                                    struct fsnotify_mark *inode_mark,
+                                    struct fsnotify_mark *vfsmount_mark,
+                                    struct fsnotify_event *event)
 {
+        struct inode *inode;
+        __u32 mask = event->mask;
+        const char *dname = event->file_name;
         struct audit_parent *parent;
 
-        parent = container_of(i_watch, struct audit_parent, wdata);
+        parent = container_of(inode_mark, struct audit_parent, mark);
 
-        if (mask & (IN_CREATE|IN_MOVED_TO) && inode)
-                audit_update_watch(parent, dname, inode->i_sb->s_dev,
-                                   inode->i_ino, 0);
-        else if (mask & (IN_DELETE|IN_MOVED_FROM))
+        BUG_ON(group != audit_watch_group);
+
+        switch (event->data_type) {
+        case (FSNOTIFY_EVENT_PATH):
+                inode = event->path.dentry->d_inode;
+                break;
+        case (FSNOTIFY_EVENT_INODE):
+                inode = event->inode;
+                break;
+        default:
+                BUG();
+                inode = NULL;
+                break;
+        };
+
+        if (mask & (FS_CREATE|FS_MOVED_TO) && inode)
+                audit_update_watch(parent, dname, inode->i_sb->s_dev, inode->i_ino, 0);
+        else if (mask & (FS_DELETE|FS_MOVED_FROM))
                 audit_update_watch(parent, dname, (dev_t)-1, (unsigned long)-1, 1);
-        /* inotify automatically removes the watch and sends IN_IGNORED */
-        else if (mask & (IN_DELETE_SELF|IN_UNMOUNT))
-                audit_remove_parent_watches(parent);
-        /* inotify does not remove the watch, so remove it manually */
-        else if(mask & IN_MOVE_SELF) {
+        else if (mask & (FS_DELETE_SELF|FS_UNMOUNT|FS_MOVE_SELF))
                 audit_remove_parent_watches(parent);
-                inotify_remove_watch_locked(audit_ih, i_watch);
-        } else if (mask & IN_IGNORED)
-                put_inotify_watch(i_watch);
+
+        return 0;
 }
 
-static const struct inotify_operations audit_inotify_ops = {
-        .handle_event   = audit_handle_ievent,
-        .destroy_watch  = audit_free_parent,
+static const struct fsnotify_ops audit_watch_fsnotify_ops = {
+        .should_send_event =    audit_watch_should_send_event,
+        .handle_event =         audit_watch_handle_event,
+        .free_group_priv =      NULL,
+        .freeing_mark =         NULL,
+        .free_event_priv =      NULL,
 };
 
 static int __init audit_watch_init(void)
 {
-        audit_ih = inotify_init(&audit_inotify_ops);
-        if (IS_ERR(audit_ih))
-                audit_panic("cannot initialize inotify handle");
+        audit_watch_group = fsnotify_alloc_group(&audit_watch_fsnotify_ops);
+        if (IS_ERR(audit_watch_group)) {
+                audit_watch_group = NULL;
+                audit_panic("cannot create audit fsnotify group");
+        }
         return 0;
 }
-subsys_initcall(audit_watch_init);
+device_initcall(audit_watch_init);
diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
index ce08041f578d..eb7675499fb5 100644
--- a/kernel/auditfilter.c
+++ b/kernel/auditfilter.c
@@ -71,6 +71,7 @@ static inline void audit_free_rule(struct audit_entry *e)
 {
         int i;
         struct audit_krule *erule = &e->rule;
+
         /* some rules don't have associated watches */
         if (erule->watch)
                 audit_put_watch(erule->watch);
@@ -746,8 +747,7 @@ static inline int audit_dupe_lsm_field(struct audit_field *df,
  * rule with the new rule in the filterlist, then free the old rule.
  * The rlist element is undefined; list manipulations are handled apart from
  * the initial copy. */
-struct audit_entry *audit_dupe_rule(struct audit_krule *old,
-                                    struct audit_watch *watch)
+struct audit_entry *audit_dupe_rule(struct audit_krule *old)
 {
         u32 fcount = old->field_count;
         struct audit_entry *entry;
@@ -769,8 +769,8 @@ struct audit_entry *audit_dupe_rule(struct audit_krule *old,
         new->prio = old->prio;
         new->buflen = old->buflen;
         new->inode_f = old->inode_f;
-        new->watch = NULL;
         new->field_count = old->field_count;
+
         /*
          * note that we are OK with not refcounting here; audit_match_tree()
          * never dereferences tree and we can't get false positives there
@@ -811,9 +811,9 @@ struct audit_entry *audit_dupe_rule(struct audit_krule *old,
                 }
         }
 
-        if (watch) {
-                audit_get_watch(watch);
-                new->watch = watch;
+        if (old->watch) {
+                audit_get_watch(old->watch);
+                new->watch = old->watch;
         }
 
         return entry;
@@ -866,7 +866,7 @@ static inline int audit_add_rule(struct audit_entry *entry)
         struct audit_watch *watch = entry->rule.watch;
         struct audit_tree *tree = entry->rule.tree;
         struct list_head *list;
-        int h, err;
+        int err;
 #ifdef CONFIG_AUDITSYSCALL
         int dont_count = 0;
 
@@ -889,15 +889,11 @@ static inline int audit_add_rule(struct audit_entry *entry)
 
         if (watch) {
                 /* audit_filter_mutex is dropped and re-taken during this call */
-                err = audit_add_watch(&entry->rule);
+                err = audit_add_watch(&entry->rule, &list);
                 if (err) {
                         mutex_unlock(&audit_filter_mutex);
                         goto error;
                 }
-                /* entry->rule.watch may have changed during audit_add_watch() */
-                watch = entry->rule.watch;
-                h = audit_hash_ino((u32)audit_watch_inode(watch));
-                list = &audit_inode_hash[h];
         }
         if (tree) {
                 err = audit_add_tree_rule(&entry->rule);
@@ -949,7 +945,6 @@ static inline int audit_del_rule(struct audit_entry *entry)
         struct audit_watch *watch = entry->rule.watch;
         struct audit_tree *tree = entry->rule.tree;
         struct list_head *list;
-        LIST_HEAD(inotify_list);
         int ret = 0;
 #ifdef CONFIG_AUDITSYSCALL
         int dont_count = 0;
@@ -969,7 +964,7 @@ static inline int audit_del_rule(struct audit_entry *entry)
         }
 
         if (e->rule.watch)
-                audit_remove_watch_rule(&e->rule, &inotify_list);
+                audit_remove_watch_rule(&e->rule);
 
         if (e->rule.tree)
                 audit_remove_tree_rule(&e->rule);
@@ -987,9 +982,6 @@ static inline int audit_del_rule(struct audit_entry *entry)
 #endif
         mutex_unlock(&audit_filter_mutex);
 
-        if (!list_empty(&inotify_list))
-                audit_inotify_unregister(&inotify_list);
-
 out:
         if (watch)
                 audit_put_watch(watch); /* match initial get */
@@ -1323,30 +1315,23 @@ static int update_lsm_rule(struct audit_krule *r)
 {
         struct audit_entry *entry = container_of(r, struct audit_entry, rule);
         struct audit_entry *nentry;
-        struct audit_watch *watch;
-        struct audit_tree *tree;
         int err = 0;
 
         if (!security_audit_rule_known(r))
                 return 0;
 
-        watch = r->watch;
-        tree = r->tree;
-        nentry = audit_dupe_rule(r, watch);
+        nentry = audit_dupe_rule(r);
         if (IS_ERR(nentry)) {
                 /* save the first error encountered for the
                  * return value */
                 err = PTR_ERR(nentry);
                 audit_panic("error updating LSM filters");
-                if (watch)
+                if (r->watch)
                         list_del(&r->rlist);
                 list_del_rcu(&entry->list);
                 list_del(&r->list);
         } else {
-                if (watch) {
-                        list_add(&nentry->rule.rlist, audit_watch_rules(watch));
-                        list_del(&r->rlist);
-                } else if (tree)
+                if (r->watch || r->tree)
                         list_replace_init(&r->rlist, &nentry->rule.rlist);
                 list_replace_rcu(&entry->list, &nentry->list);
                 list_replace(&r->list, &nentry->rule.list);
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 3828ad5fb8f1..1b31c130d034 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -65,7 +65,6 @@
 #include <linux/binfmts.h>
 #include <linux/highmem.h>
 #include <linux/syscalls.h>
-#include <linux/inotify.h>
 #include <linux/capability.h>
 #include <linux/fs_struct.h>
 
@@ -549,9 +548,8 @@ static int audit_filter_rules(struct task_struct *tsk,
                         }
                         break;
                 case AUDIT_WATCH:
-                        if (name && audit_watch_inode(rule->watch) != (unsigned long)-1)
-                                result = (name->dev == audit_watch_dev(rule->watch) &&
-                                          name->ino == audit_watch_inode(rule->watch));
+                        if (name)
+                                result = audit_watch_compare(rule->watch, name->ino, name->dev);
                         break;
                 case AUDIT_DIR:
                         if (ctx)
@@ -1726,7 +1724,7 @@ static inline void handle_one(const struct inode *inode)
         struct audit_tree_refs *p;
         struct audit_chunk *chunk;
         int count;
-        if (likely(list_empty(&inode->inotify_watches)))
+        if (likely(hlist_empty(&inode->i_fsnotify_marks)))
                 return;
         context = current->audit_context;
         p = context->trees;
@@ -1769,7 +1767,7 @@ retry:
         seq = read_seqbegin(&rename_lock);
         for(;;) {
                 struct inode *inode = d->d_inode;
-                if (inode && unlikely(!list_empty(&inode->inotify_watches))) {
+                if (inode && unlikely(!hlist_empty(&inode->i_fsnotify_marks))) {
                         struct audit_chunk *chunk;
                         chunk = audit_tree_lookup(inode);
                         if (chunk) {
@@ -1837,13 +1835,8 @@ void __audit_getname(const char *name)
         context->names[context->name_count].ino  = (unsigned long)-1;
         context->names[context->name_count].osid = 0;
         ++context->name_count;
-        if (!context->pwd.dentry) {
-                read_lock(&current->fs->lock);
-                context->pwd = current->fs->pwd;
-                path_get(&current->fs->pwd);
-                read_unlock(&current->fs->lock);
-        }
-
+        if (!context->pwd.dentry)
+                get_fs_pwd(current->fs, &context->pwd);
 }
 
 /* audit_putname - intercept a putname request
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 3ac6f5b0a64b..192f88c5b0f9 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -1102,7 +1102,7 @@ static int parse_cgroupfs_options(char *data, struct cgroup_sb_opts *opts)
                         if (opts->release_agent)
                                 return -EINVAL;
                         opts->release_agent =
-                                kstrndup(token + 14, PATH_MAX, GFP_KERNEL);
+                                kstrndup(token + 14, PATH_MAX - 1, GFP_KERNEL);
                         if (!opts->release_agent)
                                 return -ENOMEM;
                 } else if (!strncmp(token, "name=", 5)) {
@@ -1123,7 +1123,7 @@ static int parse_cgroupfs_options(char *data, struct cgroup_sb_opts *opts)
                         if (opts->name)
                                 return -EINVAL;
                         opts->name = kstrndup(name,
-                                              MAX_CGROUP_ROOT_NAMELEN,
+                                              MAX_CGROUP_ROOT_NAMELEN - 1,
                                               GFP_KERNEL);
                         if (!opts->name)
                                 return -ENOMEM;
@@ -1623,6 +1623,8 @@ static struct file_system_type cgroup_fs_type = {
         .kill_sb = cgroup_kill_sb,
 };
 
+static struct kobject *cgroup_kobj;
+
 static inline struct cgroup *__d_cgrp(struct dentry *dentry)
 {
         return dentry->d_fsdata;
@@ -1788,6 +1790,29 @@ out:
         return retval;
 }
 
+/**
+ * cgroup_attach_task_current_cg - attach task 'tsk' to current task's cgroup
+ * @tsk: the task to be attached
+ */
+int cgroup_attach_task_current_cg(struct task_struct *tsk)
+{
+        struct cgroupfs_root *root;
+        struct cgroup *cur_cg;
+        int retval = 0;
+
+        cgroup_lock();
+        for_each_active_root(root) {
+                cur_cg = task_cgroup_from_root(current, root);
+                retval = cgroup_attach_task(cur_cg, tsk);
+                if (retval)
+                        break;
+        }
+        cgroup_unlock();
+
+        return retval;
+}
+EXPORT_SYMBOL_GPL(cgroup_attach_task_current_cg);
+
 /*
  * Attach task with pid 'pid' to cgroup 'cgrp'. Call with cgroup_mutex
  * held. May take task_lock of task
@@ -3871,9 +3896,18 @@ int __init cgroup_init(void)
         hhead = css_set_hash(init_css_set.subsys);
         hlist_add_head(&init_css_set.hlist, hhead);
         BUG_ON(!init_root_id(&rootnode));
+
+        cgroup_kobj = kobject_create_and_add("cgroup", fs_kobj);
+        if (!cgroup_kobj) {
+                err = -ENOMEM;
+                goto out;
+        }
+
         err = register_filesystem(&cgroup_fs_type);
-        if (err < 0)
+        if (err < 0) {
+                kobject_put(cgroup_kobj);
                 goto out;
+        }
 
         proc_create("cgroups", 0, NULL, &proc_cgroupstats_operations);
 
diff --git a/kernel/compat.c b/kernel/compat.c
index 5adab05a3172..e167efce8423 100644
--- a/kernel/compat.c
+++ b/kernel/compat.c
@@ -279,11 +279,6 @@ asmlinkage long compat_sys_setrlimit(unsigned int resource,
                 struct compat_rlimit __user *rlim)
 {
         struct rlimit r;
-        int ret;
-        mm_segment_t old_fs = get_fs ();
-
-        if (resource >= RLIM_NLIMITS)
-                return -EINVAL;
 
         if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
             __get_user(r.rlim_cur, &rlim->rlim_cur) ||
@@ -294,10 +289,7 @@ asmlinkage long compat_sys_setrlimit(unsigned int resource,
                 r.rlim_cur = RLIM_INFINITY;
         if (r.rlim_max == COMPAT_RLIM_INFINITY)
                 r.rlim_max = RLIM_INFINITY;
-        set_fs(KERNEL_DS);
-        ret = sys_setrlimit(resource, (struct rlimit __user *) &r);
-        set_fs(old_fs);
-        return ret;
+        return do_prlimit(current, resource, &r, NULL);
 }
 
 #ifdef COMPAT_RLIM_OLD_INFINITY
@@ -329,16 +321,13 @@ asmlinkage long compat_sys_old_getrlimit(unsigned int resource,
 
 #endif
 
-asmlinkage long compat_sys_getrlimit (unsigned int resource,
+asmlinkage long compat_sys_getrlimit(unsigned int resource,
                 struct compat_rlimit __user *rlim)
 {
         struct rlimit r;
         int ret;
-        mm_segment_t old_fs = get_fs();
 
-        set_fs(KERNEL_DS);
-        ret = sys_getrlimit(resource, (struct rlimit __user *) &r);
-        set_fs(old_fs);
+        ret = do_prlimit(current, resource, NULL, &r);
         if (!ret) {
                 if (r.rlim_cur > COMPAT_RLIM_INFINITY)
                         r.rlim_cur = COMPAT_RLIM_INFINITY;
diff --git a/kernel/cpu.c b/kernel/cpu.c
index 97d1b426a4ac..f6e726f18491 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -235,11 +235,8 @@ static int __ref _cpu_down(unsigned int cpu, int tasks_frozen)
                 return -EINVAL;
 
         cpu_hotplug_begin();
-        set_cpu_active(cpu, false);
         err = __cpu_notify(CPU_DOWN_PREPARE | mod, hcpu, -1, &nr_calls);
         if (err) {
-                set_cpu_active(cpu, true);
-
                 nr_calls--;
                 __cpu_notify(CPU_DOWN_FAILED | mod, hcpu, nr_calls, NULL);
                 printk("%s: attempt to take down CPU %u failed\n",
@@ -249,7 +246,6 @@ static int __ref _cpu_down(unsigned int cpu, int tasks_frozen)
 
         err = __stop_machine(take_cpu_down, &tcd_param, cpumask_of(cpu));
         if (err) {
-                set_cpu_active(cpu, true);
                 /* CPU didn't die: tell everyone.  Can't complain. */
                 cpu_notify_nofail(CPU_DOWN_FAILED | mod, hcpu);
 
@@ -321,8 +317,6 @@ static int __cpuinit _cpu_up(unsigned int cpu, int tasks_frozen)
                 goto out_notify;
         BUG_ON(!cpu_online(cpu));
 
-        set_cpu_active(cpu, true);
-
         /* Now call notifier in preparation. */
         cpu_notify(CPU_ONLINE | mod, hcpu);
 
diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 02b9611eadde..b23c0979bbe7 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -105,7 +105,7 @@ struct cpuset {
         /* for custom sched domain */
         int relax_domain_level;
 
-        /* used for walking a cpuset heirarchy */
+        /* used for walking a cpuset hierarchy */
         struct list_head stack_list;
 };
 
@@ -2113,31 +2113,17 @@ static void scan_for_empty_cpusets(struct cpuset *root)
  * but making no active use of cpusets.
  *
  * This routine ensures that top_cpuset.cpus_allowed tracks
- * cpu_online_map on each CPU hotplug (cpuhp) event.
+ * cpu_active_mask on each CPU hotplug (cpuhp) event.
  *
  * Called within get_online_cpus().  Needs to call cgroup_lock()
  * before calling generate_sched_domains().
  */
-static int cpuset_track_online_cpus(struct notifier_block *unused_nb,
-                                unsigned long phase, void *unused_cpu)
+void cpuset_update_active_cpus(void)
 {
         struct sched_domain_attr *attr;
         cpumask_var_t *doms;
         int ndoms;
 
-        switch (phase) {
-        case CPU_ONLINE:
-        case CPU_ONLINE_FROZEN:
-        case CPU_DOWN_PREPARE:
-        case CPU_DOWN_PREPARE_FROZEN:
-        case CPU_DOWN_FAILED:
-        case CPU_DOWN_FAILED_FROZEN:
-                break;
-
-        default:
-                return NOTIFY_DONE;
-        }
-
         cgroup_lock();
         mutex_lock(&callback_mutex);
         cpumask_copy(top_cpuset.cpus_allowed, cpu_active_mask);
@@ -2148,8 +2134,6 @@ static int cpuset_track_online_cpus(struct notifier_block *unused_nb,
 
         /* Have scheduler rebuild the domains */
         partition_sched_domains(ndoms, doms, attr);
-
-        return NOTIFY_OK;
 }
 
 #ifdef CONFIG_MEMORY_HOTPLUG
@@ -2203,7 +2187,6 @@ void __init cpuset_init_smp(void)
         cpumask_copy(top_cpuset.cpus_allowed, cpu_active_mask);
         top_cpuset.mems_allowed = node_states[N_HIGH_MEMORY];
 
-        hotcpu_notifier(cpuset_track_online_cpus, 0);
         hotplug_memory_notifier(cpuset_track_online_nodes, 10);
 
         cpuset_wq = create_singlethread_workqueue("cpuset");
diff --git a/kernel/cred.c b/kernel/cred.c
index 60bc8b1e32e6..9a3e22641fe7 100644
--- a/kernel/cred.c
+++ b/kernel/cred.c
@@ -22,10 +22,6 @@
 #define kdebug(FMT, ...) \
         printk("[%-5.5s%5u] "FMT"\n", current->comm, current->pid ,##__VA_ARGS__)
 #else
-static inline __attribute__((format(printf, 1, 2)))
-void no_printk(const char *fmt, ...)
-{
-}
 #define kdebug(FMT, ...) \
         no_printk("[%-5.5s%5u] "FMT"\n", current->comm, current->pid ,##__VA_ARGS__)
 #endif
diff --git a/kernel/debug/debug_core.c b/kernel/debug/debug_core.c
index 8bc5eeffec8a..de407c78178d 100644
--- a/kernel/debug/debug_core.c
+++ b/kernel/debug/debug_core.c
@@ -6,7 +6,7 @@
  * Copyright (C) 2000-2001 VERITAS Software Corporation.
  * Copyright (C) 2002-2004 Timesys Corporation
  * Copyright (C) 2003-2004 Amit S. Kale <amitkale@linsyssoft.com>
- * Copyright (C) 2004 Pavel Machek <pavel@suse.cz>
+ * Copyright (C) 2004 Pavel Machek <pavel@ucw.cz>
  * Copyright (C) 2004-2006 Tom Rini <trini@kernel.crashing.org>
  * Copyright (C) 2004-2006 LinSysSoft Technologies Pvt. Ltd.
  * Copyright (C) 2005-2009 Wind River Systems, Inc.
@@ -605,6 +605,8 @@ cpu_master_loop:
                 if (dbg_kdb_mode) {
                         kgdb_connected = 1;
                         error = kdb_stub(ks);
+                        if (error == -1)
+                                continue;
                         kgdb_connected = 0;
                 } else {
                         error = gdb_serial_stub(ks);
@@ -739,7 +741,7 @@ static struct console kgdbcons = {
 };
 
 #ifdef CONFIG_MAGIC_SYSRQ
-static void sysrq_handle_dbg(int key, struct tty_struct *tty)
+static void sysrq_handle_dbg(int key)
 {
         if (!dbg_io_ops) {
                 printk(KERN_CRIT "ERROR: No KGDB I/O module available\n");
diff --git a/kernel/debug/gdbstub.c b/kernel/debug/gdbstub.c
index e8fd6868682d..481a7bd2dfe7 100644
--- a/kernel/debug/gdbstub.c
+++ b/kernel/debug/gdbstub.c
@@ -6,7 +6,7 @@
  * Copyright (C) 2000-2001 VERITAS Software Corporation.
  * Copyright (C) 2002-2004 Timesys Corporation
  * Copyright (C) 2003-2004 Amit S. Kale <amitkale@linsyssoft.com>
- * Copyright (C) 2004 Pavel Machek <pavel@suse.cz>
+ * Copyright (C) 2004 Pavel Machek <pavel@ucw.cz>
  * Copyright (C) 2004-2006 Tom Rini <trini@kernel.crashing.org>
  * Copyright (C) 2004-2006 LinSysSoft Technologies Pvt. Ltd.
  * Copyright (C) 2005-2009 Wind River Systems, Inc.
@@ -52,17 +52,6 @@ static unsigned long		gdb_regs[(NUMREGBYTES +
  * GDB remote protocol parser:
  */
 
-static int hex(char ch)
-{
-        if ((ch >= 'a') && (ch <= 'f'))
-                return ch - 'a' + 10;
-        if ((ch >= '0') && (ch <= '9'))
-                return ch - '0';
-        if ((ch >= 'A') && (ch <= 'F'))
-                return ch - 'A' + 10;
-        return -1;
-}
-
 #ifdef CONFIG_KGDB_KDB
 static int gdbstub_read_wait(void)
 {
@@ -123,8 +112,8 @@ static void get_packet(char *buffer)
                 buffer[count] = 0;
 
                 if (ch == '#') {
-                        xmitcsum = hex(gdbstub_read_wait()) << 4;
-                        xmitcsum += hex(gdbstub_read_wait());
+                        xmitcsum = hex_to_bin(gdbstub_read_wait()) << 4;
+                        xmitcsum += hex_to_bin(gdbstub_read_wait());
 
                         if (checksum != xmitcsum)
                                 /* failed checksum */
@@ -236,7 +225,7 @@ void gdbstub_msg_write(const char *s, int len)
  * buf.  Return a pointer to the last char put in buf (null). May
  * return an error.
  */
-int kgdb_mem2hex(char *mem, char *buf, int count)
+char *kgdb_mem2hex(char *mem, char *buf, int count)
 {
         char *tmp;
         int err;
@@ -248,17 +237,16 @@ int kgdb_mem2hex(char *mem, char *buf, int count)
         tmp = buf + count;
 
         err = probe_kernel_read(tmp, mem, count);
-        if (!err) {
-                while (count > 0) {
-                        buf = pack_hex_byte(buf, *tmp);
-                        tmp++;
-                        count--;
-                }
-
-                *buf = 0;
+        if (err)
+                return NULL;
+        while (count > 0) {
+                buf = pack_hex_byte(buf, *tmp);
+                tmp++;
+                count--;
         }
+        *buf = 0;
 
-        return err;
+        return buf;
 }
 
 /*
@@ -280,8 +268,8 @@ int kgdb_hex2mem(char *buf, char *mem, int count)
         tmp_hex = tmp_raw - 1;
         while (tmp_hex >= buf) {
                 tmp_raw--;
-                *tmp_raw = hex(*tmp_hex--);
-                *tmp_raw |= hex(*tmp_hex--) << 4;
+                *tmp_raw = hex_to_bin(*tmp_hex--);
+                *tmp_raw |= hex_to_bin(*tmp_hex--) << 4;
         }
 
         return probe_kernel_write(mem, tmp_raw, count);
@@ -304,7 +292,7 @@ int kgdb_hex2long(char **ptr, unsigned long *long_val)
                 (*ptr)++;
         }
         while (**ptr) {
-                hex_val = hex(**ptr);
+                hex_val = hex_to_bin(**ptr);
                 if (hex_val < 0)
                         break;
 
@@ -339,6 +327,32 @@ static int kgdb_ebin2mem(char *buf, char *mem, int count)
         return probe_kernel_write(mem, c, size);
 }
 
+#if DBG_MAX_REG_NUM > 0
+void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs)
+{
+        int i;
+        int idx = 0;
+        char *ptr = (char *)gdb_regs;
+
+        for (i = 0; i < DBG_MAX_REG_NUM; i++) {
+                dbg_get_reg(i, ptr + idx, regs);
+                idx += dbg_reg_def[i].size;
+        }
+}
+
+void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs)
+{
+        int i;
+        int idx = 0;
+        char *ptr = (char *)gdb_regs;
+
+        for (i = 0; i < DBG_MAX_REG_NUM; i++) {
+                dbg_set_reg(i, ptr + idx, regs);
+                idx += dbg_reg_def[i].size;
+        }
+}
+#endif /* DBG_MAX_REG_NUM > 0 */
+
 /* Write memory due to an 'M' or 'X' packet. */
 static int write_mem_msg(int binary)
 {
@@ -378,28 +392,31 @@ static void error_packet(char *pkt, int error)
  * remapped to negative TIDs.
  */
 
-#define BUF_THREAD_ID_SIZE      16
+#define BUF_THREAD_ID_SIZE      8
 
 static char *pack_threadid(char *pkt, unsigned char *id)
 {
-        char *limit;
+        unsigned char *limit;
+        int lzero = 1;
+
+        limit = id + (BUF_THREAD_ID_SIZE / 2);
+        while (id < limit) {
+                if (!lzero || *id != 0) {
+                        pkt = pack_hex_byte(pkt, *id);
+                        lzero = 0;
+                }
+                id++;
+        }
 
-        limit = pkt + BUF_THREAD_ID_SIZE;
-        while (pkt < limit)
-                pkt = pack_hex_byte(pkt, *id++);
+        if (lzero)
+                pkt = pack_hex_byte(pkt, 0);
 
         return pkt;
 }
 
 static void int_to_threadref(unsigned char *id, int value)
 {
-        unsigned char *scan;
-        int i = 4;
-
-        scan = (unsigned char *)id;
-        while (i--)
-                *scan++ = 0;
-        put_unaligned_be32(value, scan);
+        put_unaligned_be32(value, id);
 }
 
 static struct task_struct *getthread(struct pt_regs *regs, int tid)
@@ -463,8 +480,7 @@ static void gdb_cmd_status(struct kgdb_state *ks)
         pack_hex_byte(&remcom_out_buffer[1], ks->signo);
 }
 
-/* Handle the 'g' get registers request */
-static void gdb_cmd_getregs(struct kgdb_state *ks)
+static void gdb_get_regs_helper(struct kgdb_state *ks)
 {
         struct task_struct *thread;
         void *local_debuggerinfo;
@@ -505,6 +521,12 @@ static void gdb_cmd_getregs(struct kgdb_state *ks)
                  */
                 sleeping_thread_to_gdb_regs(gdb_regs, thread);
         }
+}
+
+/* Handle the 'g' get registers request */
+static void gdb_cmd_getregs(struct kgdb_state *ks)
+{
+        gdb_get_regs_helper(ks);
         kgdb_mem2hex((char *)gdb_regs, remcom_out_buffer, NUMREGBYTES);
 }
 
@@ -527,13 +549,13 @@ static void gdb_cmd_memread(struct kgdb_state *ks)
         char *ptr = &remcom_in_buffer[1];
         unsigned long length;
         unsigned long addr;
-        int err;
+        char *err;
 
         if (kgdb_hex2long(&ptr, &addr) > 0 && *ptr++ == ',' &&
                                         kgdb_hex2long(&ptr, &length) > 0) {
                 err = kgdb_mem2hex((char *)addr, remcom_out_buffer, length);
-                if (err)
-                        error_packet(remcom_out_buffer, err);
+                if (!err)
+                        error_packet(remcom_out_buffer, -EINVAL);
         } else {
                 error_packet(remcom_out_buffer, -EINVAL);
         }
@@ -550,6 +572,60 @@ static void gdb_cmd_memwrite(struct kgdb_state *ks)
                 strcpy(remcom_out_buffer, "OK");
 }
 
+#if DBG_MAX_REG_NUM > 0
+static char *gdb_hex_reg_helper(int regnum, char *out)
+{
+        int i;
+        int offset = 0;
+
+        for (i = 0; i < regnum; i++)
+                offset += dbg_reg_def[i].size;
+        return kgdb_mem2hex((char *)gdb_regs + offset, out,
+                            dbg_reg_def[i].size);
+}
+
+/* Handle the 'p' individual regster get */
+static void gdb_cmd_reg_get(struct kgdb_state *ks)
+{
+        unsigned long regnum;
+        char *ptr = &remcom_in_buffer[1];
+
+        kgdb_hex2long(&ptr, &regnum);
+        if (regnum >= DBG_MAX_REG_NUM) {
+                error_packet(remcom_out_buffer, -EINVAL);
+                return;
+        }
+        gdb_get_regs_helper(ks);
+        gdb_hex_reg_helper(regnum, remcom_out_buffer);
+}
+
+/* Handle the 'P' individual regster set */
+static void gdb_cmd_reg_set(struct kgdb_state *ks)
+{
+        unsigned long regnum;
+        char *ptr = &remcom_in_buffer[1];
+        int i = 0;
+
+        kgdb_hex2long(&ptr, &regnum);
+        if (*ptr++ != '=' ||
+            !(!kgdb_usethread || kgdb_usethread == current) ||
+            !dbg_get_reg(regnum, gdb_regs, ks->linux_regs)) {
+                error_packet(remcom_out_buffer, -EINVAL);
+                return;
+        }
+        memset(gdb_regs, 0, sizeof(gdb_regs));
+        while (i < sizeof(gdb_regs) * 2)
+                if (hex_to_bin(ptr[i]) >= 0)
+                        i++;
+                else
+                        break;
+        i = i / 2;
+        kgdb_hex2mem(ptr, (char *)gdb_regs, i);
+        dbg_set_reg(regnum, gdb_regs, ks->linux_regs);
+        strcpy(remcom_out_buffer, "OK");
+}
+#endif /* DBG_MAX_REG_NUM > 0 */
+
 /* Handle the 'X' memory binary write bytes */
 static void gdb_cmd_binwrite(struct kgdb_state *ks)
 {
@@ -612,7 +688,7 @@ static void gdb_cmd_query(struct kgdb_state *ks)
 {
         struct task_struct *g;
         struct task_struct *p;
-        unsigned char thref[8];
+        unsigned char thref[BUF_THREAD_ID_SIZE];
         char *ptr;
         int i;
         int cpu;
@@ -632,8 +708,7 @@ static void gdb_cmd_query(struct kgdb_state *ks)
                         for_each_online_cpu(cpu) {
                                 ks->thr_query = 0;
                                 int_to_threadref(thref, -cpu - 2);
-                                pack_threadid(ptr, thref);
-                                ptr += BUF_THREAD_ID_SIZE;
+                                ptr = pack_threadid(ptr, thref);
                                 *(ptr++) = ',';
                                 i++;
                         }
@@ -642,8 +717,7 @@ static void gdb_cmd_query(struct kgdb_state *ks)
                 do_each_thread(g, p) {
                         if (i >= ks->thr_query && !finished) {
                                 int_to_threadref(thref, p->pid);
-                                pack_threadid(ptr, thref);
-                                ptr += BUF_THREAD_ID_SIZE;
+                                ptr = pack_threadid(ptr, thref);
                                 *(ptr++) = ',';
                                 ks->thr_query++;
                                 if (ks->thr_query % KGDB_MAX_THREAD_QUERY == 0)
@@ -858,11 +932,14 @@ int gdb_serial_stub(struct kgdb_state *ks)
         int error = 0;
         int tmp;
 
-        /* Clear the out buffer. */
+        /* Initialize comm buffer and globals. */
         memset(remcom_out_buffer, 0, sizeof(remcom_out_buffer));
+        kgdb_usethread = kgdb_info[ks->cpu].task;
+        ks->kgdb_usethreadid = shadow_pid(kgdb_info[ks->cpu].task->pid);
+        ks->pass_exception = 0;
 
         if (kgdb_connected) {
-                unsigned char thref[8];
+                unsigned char thref[BUF_THREAD_ID_SIZE];
                 char *ptr;
 
                 /* Reply to host that an exception has occurred */
@@ -876,10 +953,6 @@ int gdb_serial_stub(struct kgdb_state *ks)
                 put_packet(remcom_out_buffer);
         }
 
-        kgdb_usethread = kgdb_info[ks->cpu].task;
-        ks->kgdb_usethreadid = shadow_pid(kgdb_info[ks->cpu].task->pid);
-        ks->pass_exception = 0;
-
         while (1) {
                 error = 0;
 
@@ -904,6 +977,14 @@ int gdb_serial_stub(struct kgdb_state *ks)
                 case 'M': /* MAA..AA,LLLL: Write LLLL bytes at address AA..AA */
                         gdb_cmd_memwrite(ks);
                         break;
+#if DBG_MAX_REG_NUM > 0
+                case 'p': /* pXX Return gdb register XX (in hex) */
+                        gdb_cmd_reg_get(ks);
+                        break;
+                case 'P': /* PXX=aaaa Set gdb register XX to aaaa (in hex) */
+                        gdb_cmd_reg_set(ks);
+                        break;
+#endif /* DBG_MAX_REG_NUM > 0 */
                 case 'X': /* XAA..AA,LLLL: Write LLLL bytes at address AA..AA */
                         gdb_cmd_binwrite(ks);
                         break;
diff --git a/kernel/debug/kdb/kdb_main.c b/kernel/debug/kdb/kdb_main.c
index ebe4a287419e..caf057a3de0e 100644
--- a/kernel/debug/kdb/kdb_main.c
+++ b/kernel/debug/kdb/kdb_main.c
@@ -312,7 +312,7 @@ int kdbgetularg(const char *arg, unsigned long *value)
 
         if (endp == arg) {
                 /*
-                 * Try base 16, for us folks too lazy to type the
+                 * Also try base 16, for us folks too lazy to type the
                  * leading 0x...
                  */
                 val = simple_strtoul(arg, &endp, 16);
@@ -325,6 +325,25 @@ int kdbgetularg(const char *arg, unsigned long *value)
         return 0;
 }
 
+int kdbgetu64arg(const char *arg, u64 *value)
+{
+        char *endp;
+        u64 val;
+
+        val = simple_strtoull(arg, &endp, 0);
+
+        if (endp == arg) {
+
+                val = simple_strtoull(arg, &endp, 16);
+                if (endp == arg)
+                        return KDB_BADINT;
+        }
+
+        *value = val;
+
+        return 0;
+}
+
 /*
  * kdb_set - This function implements the 'set' command.  Alter an
  *      existing environment variable or create a new one.
@@ -1770,11 +1789,65 @@ static int kdb_go(int argc, const char **argv)
  */
 static int kdb_rd(int argc, const char **argv)
 {
-        int diag = kdb_check_regs();
-        if (diag)
-                return diag;
+        int len = kdb_check_regs();
+#if DBG_MAX_REG_NUM > 0
+        int i;
+        char *rname;
+        int rsize;
+        u64 reg64;
+        u32 reg32;
+        u16 reg16;
+        u8 reg8;
+
+        if (len)
+                return len;
+
+        for (i = 0; i < DBG_MAX_REG_NUM; i++) {
+                rsize = dbg_reg_def[i].size * 2;
+                if (rsize > 16)
+                        rsize = 2;
+                if (len + strlen(dbg_reg_def[i].name) + 4 + rsize > 80) {
+                        len = 0;
+                        kdb_printf("\n");
+                }
+                if (len)
+                        len += kdb_printf("  ");
+                switch(dbg_reg_def[i].size * 8) {
+                case 8:
+                        rname = dbg_get_reg(i, &reg8, kdb_current_regs);
+                        if (!rname)
+                                break;
+                        len += kdb_printf("%s: %02x", rname, reg8);
+                        break;
+                case 16:
+                        rname = dbg_get_reg(i, &reg16, kdb_current_regs);
+                        if (!rname)
+                                break;
+                        len += kdb_printf("%s: %04x", rname, reg16);
+                        break;
+                case 32:
+                        rname = dbg_get_reg(i, &reg32, kdb_current_regs);
+                        if (!rname)
+                                break;
+                        len += kdb_printf("%s: %08x", rname, reg32);
+                        break;
+                case 64:
+                        rname = dbg_get_reg(i, &reg64, kdb_current_regs);
+                        if (!rname)
+                                break;
+                        len += kdb_printf("%s: %016llx", rname, reg64);
+                        break;
+                default:
+                        len += kdb_printf("%s: ??", dbg_reg_def[i].name);
+                }
+        }
+        kdb_printf("\n");
+#else
+        if (len)
+                return len;
 
         kdb_dumpregs(kdb_current_regs);
+#endif
         return 0;
 }
 
@@ -1782,32 +1855,67 @@ static int kdb_rd(int argc, const char **argv)
  * kdb_rm - This function implements the 'rm' (register modify)  command.
  *      rm register-name new-contents
  * Remarks:
- *      Currently doesn't allow modification of control or
- *      debug registers.
+ *      Allows register modification with the same restrictions as gdb
  */
 static int kdb_rm(int argc, const char **argv)
 {
+#if DBG_MAX_REG_NUM > 0
         int diag;
-        int ind = 0;
-        unsigned long contents;
+        const char *rname;
+        int i;
+        u64 reg64;
+        u32 reg32;
+        u16 reg16;
+        u8 reg8;
 
         if (argc != 2)
                 return KDB_ARGCOUNT;
         /*
          * Allow presence or absence of leading '%' symbol.
          */
-        if (argv[1][0] == '%')
-                ind = 1;
+        rname = argv[1];
+        if (*rname == '%')
+                rname++;
 
-        diag = kdbgetularg(argv[2], &contents);
+        diag = kdbgetu64arg(argv[2], &reg64);
         if (diag)
                 return diag;
 
         diag = kdb_check_regs();
         if (diag)
                 return diag;
+
+        diag = KDB_BADREG;
+        for (i = 0; i < DBG_MAX_REG_NUM; i++) {
+                if (strcmp(rname, dbg_reg_def[i].name) == 0) {
+                        diag = 0;
+                        break;
+                }
+        }
+        if (!diag) {
+                switch(dbg_reg_def[i].size * 8) {
+                case 8:
+                        reg8 = reg64;
+                        dbg_set_reg(i, &reg8, kdb_current_regs);
+                        break;
+                case 16:
+                        reg16 = reg64;
+                        dbg_set_reg(i, &reg16, kdb_current_regs);
+                        break;
+                case 32:
+                        reg32 = reg64;
+                        dbg_set_reg(i, &reg32, kdb_current_regs);
+                        break;
+                case 64:
+                        dbg_set_reg(i, &reg64, kdb_current_regs);
+                        break;
+                }
+        }
+        return diag;
+#else
         kdb_printf("ERROR: Register set currently not implemented\n");
-        return 0;
+    return 0;
+#endif
 }
 
 #if defined(CONFIG_MAGIC_SYSRQ)
@@ -1821,7 +1929,7 @@ static int kdb_sr(int argc, const char **argv)
         if (argc != 1)
                 return KDB_ARGCOUNT;
         kdb_trap_printk++;
-        __handle_sysrq(*argv[1], NULL, 0);
+        __handle_sysrq(*argv[1], false);
         kdb_trap_printk--;
 
         return 0;
@@ -2440,6 +2548,7 @@ static void kdb_sysinfo(struct sysinfo *val)
  */
 static int kdb_summary(int argc, const char **argv)
 {
+        struct timespec now;
         struct kdb_tm tm;
         struct sysinfo val;
 
@@ -2454,7 +2563,8 @@ static int kdb_summary(int argc, const char **argv)
         kdb_printf("domainname %s\n", init_uts_ns.name.domainname);
         kdb_printf("ccversion  %s\n", __stringify(CCVERSION));
 
-        kdb_gmtime(&xtime, &tm);
+        now = __current_kernel_time();
+        kdb_gmtime(&now, &tm);
         kdb_printf("date       %04d-%02d-%02d %02d:%02d:%02d "
                    "tz_minuteswest %d\n",
                 1900+tm.tm_year, tm.tm_mon+1, tm.tm_mday,
diff --git a/kernel/debug/kdb/kdb_private.h b/kernel/debug/kdb/kdb_private.h
index 97d3ba69775d..be775f7e81e0 100644
--- a/kernel/debug/kdb/kdb_private.h
+++ b/kernel/debug/kdb/kdb_private.h
@@ -144,9 +144,7 @@ extern int kdb_getword(unsigned long *, unsigned long, size_t);
 extern int kdb_putword(unsigned long, unsigned long, size_t);
 
 extern int kdbgetularg(const char *, unsigned long *);
-extern int kdb_set(int, const char **);
 extern char *kdbgetenv(const char *);
-extern int kdbgetintenv(const char *, int *);
 extern int kdbgetaddrarg(int, const char **, int*, unsigned long *,
                          long *, char **);
 extern int kdbgetsymval(const char *, kdb_symtab_t *);
@@ -257,7 +255,14 @@ extern void kdb_ps1(const struct task_struct *p);
 extern void kdb_print_nameval(const char *name, unsigned long val);
 extern void kdb_send_sig_info(struct task_struct *p, struct siginfo *info);
 extern void kdb_meminfo_proc_show(void);
+#ifdef CONFIG_KALLSYMS
 extern const char *kdb_walk_kallsyms(loff_t *pos);
+#else /* ! CONFIG_KALLSYMS */
+static inline const char *kdb_walk_kallsyms(loff_t *pos)
+{
+        return NULL;
+}
+#endif /* ! CONFIG_KALLSYMS */
 extern char *kdb_getstr(char *, size_t, char *);
 
 /* Defines for kdb_symbol_print */
diff --git a/kernel/debug/kdb/kdb_support.c b/kernel/debug/kdb/kdb_support.c
index 45344d5c53dd..6b2485dcb050 100644
--- a/kernel/debug/kdb/kdb_support.c
+++ b/kernel/debug/kdb/kdb_support.c
@@ -82,8 +82,8 @@ static char *kdb_name_table[100];	/* arbitrary size */
 int kdbnearsym(unsigned long addr, kdb_symtab_t *symtab)
 {
         int ret = 0;
-        unsigned long symbolsize;
-        unsigned long offset;
+        unsigned long symbolsize = 0;
+        unsigned long offset = 0;
 #define knt1_size 128           /* must be >= kallsyms table size */
         char *knt1 = NULL;
 
diff --git a/kernel/exec_domain.c b/kernel/exec_domain.c
index dd62f8e714ca..0dbeae374225 100644
--- a/kernel/exec_domain.c
+++ b/kernel/exec_domain.c
@@ -134,23 +134,14 @@ unregister:
         return 0;
 }
 
-int
-__set_personality(unsigned int personality)
+int __set_personality(unsigned int personality)
 {
-        struct exec_domain      *ep, *oep;
-
-        ep = lookup_exec_domain(personality);
-        if (ep == current_thread_info()->exec_domain) {
-                current->personality = personality;
-                module_put(ep->module);
-                return 0;
-        }
+        struct exec_domain *oep = current_thread_info()->exec_domain;
 
+        current_thread_info()->exec_domain = lookup_exec_domain(personality);
         current->personality = personality;
-        oep = current_thread_info()->exec_domain;
-        current_thread_info()->exec_domain = ep;
-
         module_put(oep->module);
+
         return 0;
 }
 
@@ -192,11 +183,8 @@ SYSCALL_DEFINE1(personality, unsigned int, personality)
 {
         unsigned int old = current->personality;
 
-        if (personality != 0xffffffff) {
+        if (personality != 0xffffffff)
                 set_personality(personality);
-                if (current->personality != personality)
-                        return -EINVAL;
-        }
 
         return old;
 }
diff --git a/kernel/exit.c b/kernel/exit.c
index ceffc67b564a..03120229db28 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -771,9 +771,12 @@ static void forget_original_parent(struct task_struct *father)
         struct task_struct *p, *n, *reaper;
         LIST_HEAD(dead_children);
 
-        exit_ptrace(father);
-
         write_lock_irq(&tasklist_lock);
+        /*
+         * Note that exit_ptrace() and find_new_reaper() might
+         * drop tasklist_lock and reacquire it.
+         */
+        exit_ptrace(father);
         reaper = find_new_reaper(father);
 
         list_for_each_entry_safe(p, n, &father->children, sibling) {
@@ -1383,8 +1386,7 @@ static int wait_task_stopped(struct wait_opts *wo,
         if (!unlikely(wo->wo_flags & WNOWAIT))
                 *p_code = 0;
 
-        /* don't need the RCU readlock here as we're holding a spinlock */
-        uid = __task_cred(p)->uid;
+        uid = task_uid(p);
 unlock_sig:
         spin_unlock_irq(&p->sighand->siglock);
         if (!exit_code)
@@ -1457,7 +1459,7 @@ static int wait_task_continued(struct wait_opts *wo, struct task_struct *p)
         }
         if (!unlikely(wo->wo_flags & WNOWAIT))
                 p->signal->flags &= ~SIGNAL_STOP_CONTINUED;
-        uid = __task_cred(p)->uid;
+        uid = task_uid(p);
         spin_unlock_irq(&p->sighand->siglock);
 
         pid = task_pid_vnr(p);
diff --git a/kernel/fork.c b/kernel/fork.c
index b6cce14ba047..b7e9d60a675d 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -300,7 +300,7 @@ out:
 #ifdef CONFIG_MMU
 static int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
 {
-        struct vm_area_struct *mpnt, *tmp, **pprev;
+        struct vm_area_struct *mpnt, *tmp, *prev, **pprev;
         struct rb_node **rb_link, *rb_parent;
         int retval;
         unsigned long charge;
@@ -328,6 +328,7 @@ static int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
         if (retval)
                 goto out;
 
+        prev = NULL;
         for (mpnt = oldmm->mmap; mpnt; mpnt = mpnt->vm_next) {
                 struct file *file;
 
@@ -359,7 +360,7 @@ static int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
                         goto fail_nomem_anon_vma_fork;
                 tmp->vm_flags &= ~VM_LOCKED;
                 tmp->vm_mm = mm;
-                tmp->vm_next = NULL;
+                tmp->vm_next = tmp->vm_prev = NULL;
                 file = tmp->vm_file;
                 if (file) {
                         struct inode *inode = file->f_path.dentry->d_inode;
@@ -392,6 +393,8 @@ static int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
                  */
                 *pprev = tmp;
                 pprev = &tmp->vm_next;
+                tmp->vm_prev = prev;
+                prev = tmp;
 
                 __vma_link_rb(mm, tmp, rb_link, rb_parent);
                 rb_link = &tmp->vm_rb.rb_right;
@@ -752,13 +755,13 @@ static int copy_fs(unsigned long clone_flags, struct task_struct *tsk)
         struct fs_struct *fs = current->fs;
         if (clone_flags & CLONE_FS) {
                 /* tsk->fs is already what we want */
-                write_lock(&fs->lock);
+                spin_lock(&fs->lock);
                 if (fs->in_exec) {
-                        write_unlock(&fs->lock);
+                        spin_unlock(&fs->lock);
                         return -EAGAIN;
                 }
                 fs->users++;
-                write_unlock(&fs->lock);
+                spin_unlock(&fs->lock);
                 return 0;
         }
         tsk->fs = copy_fs_struct(fs);
@@ -899,6 +902,7 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
         tty_audit_fork(sig);
 
         sig->oom_adj = current->signal->oom_adj;
+        sig->oom_score_adj = current->signal->oom_score_adj;
 
         return 0;
 }
@@ -907,7 +911,7 @@ static void copy_flags(unsigned long clone_flags, struct task_struct *p)
 {
         unsigned long new_flags = p->flags;
 
-        new_flags &= ~PF_SUPERPRIV;
+        new_flags &= ~(PF_SUPERPRIV | PF_WQ_WORKER);
         new_flags |= PF_FORKNOEXEC;
         new_flags |= PF_STARTING;
         p->flags = new_flags;
@@ -1675,13 +1679,13 @@ SYSCALL_DEFINE1(unshare, unsigned long, unshare_flags)
 
                 if (new_fs) {
                         fs = current->fs;
-                        write_lock(&fs->lock);
+                        spin_lock(&fs->lock);
                         current->fs = new_fs;
                         if (--fs->users)
                                 new_fs = NULL;
                         else
                                 new_fs = fs;
-                        write_unlock(&fs->lock);
+                        spin_unlock(&fs->lock);
                 }
 
                 if (new_mm) {
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index 5c69e996bd0f..ce669174f355 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -90,7 +90,7 @@ static void hrtimer_get_softirq_time(struct hrtimer_cpu_base *base)
         do {
                 seq = read_seqbegin(&xtime_lock);
                 xts = __current_kernel_time();
-                tom = wall_to_monotonic;
+                tom = __get_wall_to_monotonic();
         } while (read_seqretry(&xtime_lock, seq));
 
         xtim = timespec_to_ktime(xts);
@@ -144,12 +144,8 @@ struct hrtimer_clock_base *lock_hrtimer_base(const struct hrtimer *timer,
 static int hrtimer_get_target(int this_cpu, int pinned)
 {
 #ifdef CONFIG_NO_HZ
-        if (!pinned && get_sysctl_timer_migration() && idle_cpu(this_cpu)) {
-                int preferred_cpu = get_nohz_load_balancer();
-
-                if (preferred_cpu >= 0)
-                        return preferred_cpu;
-        }
+        if (!pinned && get_sysctl_timer_migration() && idle_cpu(this_cpu))
+                return get_nohz_timer_target();
 #endif
         return this_cpu;
 }
@@ -612,7 +608,7 @@ static int hrtimer_reprogram(struct hrtimer *timer,
 static void retrigger_next_event(void *arg)
 {
         struct hrtimer_cpu_base *base;
-        struct timespec realtime_offset;
+        struct timespec realtime_offset, wtm;
         unsigned long seq;
 
         if (!hrtimer_hres_active())
@@ -620,10 +616,9 @@ static void retrigger_next_event(void *arg)
 
         do {
                 seq = read_seqbegin(&xtime_lock);
-                set_normalized_timespec(&realtime_offset,
-                                        -wall_to_monotonic.tv_sec,
-                                        -wall_to_monotonic.tv_nsec);
+                wtm = __get_wall_to_monotonic();
         } while (read_seqretry(&xtime_lock, seq));
+        set_normalized_timespec(&realtime_offset, -wtm.tv_sec, -wtm.tv_nsec);
 
         base = &__get_cpu_var(hrtimer_bases);
 
diff --git a/kernel/hw_breakpoint.c b/kernel/hw_breakpoint.c
index 7a56b22e0602..d71a987fd2bf 100644
--- a/kernel/hw_breakpoint.c
+++ b/kernel/hw_breakpoint.c
@@ -41,6 +41,7 @@
 #include <linux/sched.h>
 #include <linux/init.h>
 #include <linux/slab.h>
+#include <linux/list.h>
 #include <linux/cpu.h>
 #include <linux/smp.h>
 
@@ -62,6 +63,9 @@ static DEFINE_PER_CPU(unsigned int, nr_bp_flexible[TYPE_MAX]);
 
 static int nr_slots[TYPE_MAX];
 
+/* Keep track of the breakpoints attached to tasks */
+static LIST_HEAD(bp_task_head);
+
 static int constraints_initialized;
 
 /* Gather the number of total pinned and un-pinned bp in a cpuset */
@@ -103,33 +107,21 @@ static unsigned int max_task_bp_pinned(int cpu, enum bp_type_idx type)
         return 0;
 }
 
-static int task_bp_pinned(struct task_struct *tsk, enum bp_type_idx type)
+/*
+ * Count the number of breakpoints of the same type and same task.
+ * The given event must be not on the list.
+ */
+static int task_bp_pinned(struct perf_event *bp, enum bp_type_idx type)
 {
-        struct perf_event_context *ctx = tsk->perf_event_ctxp;
-        struct list_head *list;
-        struct perf_event *bp;
-        unsigned long flags;
+        struct perf_event_context *ctx = bp->ctx;
+        struct perf_event *iter;
         int count = 0;
 
-        if (WARN_ONCE(!ctx, "No perf context for this task"))
-                return 0;
-
-        list = &ctx->event_list;
-
-        raw_spin_lock_irqsave(&ctx->lock, flags);
-
-        /*
-         * The current breakpoint counter is not included in the list
-         * at the open() callback time
-         */
-        list_for_each_entry(bp, list, event_entry) {
-                if (bp->attr.type == PERF_TYPE_BREAKPOINT)
-                        if (find_slot_idx(bp) == type)
-                                count += hw_breakpoint_weight(bp);
+        list_for_each_entry(iter, &bp_task_head, hw.bp_list) {
+                if (iter->ctx == ctx && find_slot_idx(iter) == type)
+                        count += hw_breakpoint_weight(iter);
         }
 
-        raw_spin_unlock_irqrestore(&ctx->lock, flags);
-
         return count;
 }
 
@@ -149,7 +141,7 @@ fetch_bp_busy_slots(struct bp_busy_slots *slots, struct perf_event *bp,
                 if (!tsk)
                         slots->pinned += max_task_bp_pinned(cpu, type);
                 else
-                        slots->pinned += task_bp_pinned(tsk, type);
+                        slots->pinned += task_bp_pinned(bp, type);
                 slots->flexible = per_cpu(nr_bp_flexible[type], cpu);
 
                 return;
@@ -162,7 +154,7 @@ fetch_bp_busy_slots(struct bp_busy_slots *slots, struct perf_event *bp,
                 if (!tsk)
                         nr += max_task_bp_pinned(cpu, type);
                 else
-                        nr += task_bp_pinned(tsk, type);
+                        nr += task_bp_pinned(bp, type);
 
                 if (nr > slots->pinned)
                         slots->pinned = nr;
@@ -188,7 +180,7 @@ fetch_this_slot(struct bp_busy_slots *slots, int weight)
 /*
  * Add a pinned breakpoint for the given task in our constraint table
  */
-static void toggle_bp_task_slot(struct task_struct *tsk, int cpu, bool enable,
+static void toggle_bp_task_slot(struct perf_event *bp, int cpu, bool enable,
                                 enum bp_type_idx type, int weight)
 {
         unsigned int *tsk_pinned;
@@ -196,10 +188,11 @@ static void toggle_bp_task_slot(struct task_struct *tsk, int cpu, bool enable,
         int old_idx = 0;
         int idx = 0;
 
-        old_count = task_bp_pinned(tsk, type);
+        old_count = task_bp_pinned(bp, type);
         old_idx = old_count - 1;
         idx = old_idx + weight;
 
+        /* tsk_pinned[n] is the number of tasks having n breakpoints */
         tsk_pinned = per_cpu(nr_task_bp_pinned[type], cpu);
         if (enable) {
                 tsk_pinned[idx]++;
@@ -222,23 +215,41 @@ toggle_bp_slot(struct perf_event *bp, bool enable, enum bp_type_idx type,
         int cpu = bp->cpu;
         struct task_struct *tsk = bp->ctx->task;
 
+        /* Pinned counter cpu profiling */
+        if (!tsk) {
+
+                if (enable)
+                        per_cpu(nr_cpu_bp_pinned[type], bp->cpu) += weight;
+                else
+                        per_cpu(nr_cpu_bp_pinned[type], bp->cpu) -= weight;
+                return;
+        }
+
         /* Pinned counter task profiling */
-        if (tsk) {
-                if (cpu >= 0) {
-                        toggle_bp_task_slot(tsk, cpu, enable, type, weight);
-                        return;
-                }
 
+        if (!enable)
+                list_del(&bp->hw.bp_list);
+
+        if (cpu >= 0) {
+                toggle_bp_task_slot(bp, cpu, enable, type, weight);
+        } else {
                 for_each_online_cpu(cpu)
-                        toggle_bp_task_slot(tsk, cpu, enable, type, weight);
-                return;
+                        toggle_bp_task_slot(bp, cpu, enable, type, weight);
         }
 
-        /* Pinned counter cpu profiling */
         if (enable)
-                per_cpu(nr_cpu_bp_pinned[type], bp->cpu) += weight;
-        else
-                per_cpu(nr_cpu_bp_pinned[type], bp->cpu) -= weight;
+                list_add_tail(&bp->hw.bp_list, &bp_task_head);
+}
+
+/*
+ * Function to perform processor-specific cleanup during unregistration
+ */
+__weak void arch_unregister_hw_breakpoint(struct perf_event *bp)
+{
+        /*
+         * A weak stub function here for those archs that don't define
+         * it inside arch/.../kernel/hw_breakpoint.c
+         */
 }
 
 /*
@@ -301,6 +312,10 @@ static int __reserve_bp_slot(struct perf_event *bp)
         weight = hw_breakpoint_weight(bp);
 
         fetch_bp_busy_slots(&slots, bp, type);
+        /*
+         * Simulate the addition of this breakpoint to the constraints
+         * and see the result.
+         */
         fetch_this_slot(&slots, weight);
 
         /* Flexible counters need to keep at least one slot */
@@ -339,6 +354,7 @@ void release_bp_slot(struct perf_event *bp)
 {
         mutex_lock(&nr_bp_mutex);
 
+        arch_unregister_hw_breakpoint(bp);
         __release_bp_slot(bp);
 
         mutex_unlock(&nr_bp_mutex);
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index e1497481fe8a..c3003e9d91a3 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -216,7 +216,7 @@ static inline int setup_affinity(unsigned int irq, struct irq_desc *desc)
 void __disable_irq(struct irq_desc *desc, unsigned int irq, bool suspend)
 {
         if (suspend) {
-                if (!desc->action || (desc->action->flags & IRQF_TIMER))
+                if (!desc->action || (desc->action->flags & IRQF_NO_SUSPEND))
                         return;
                 desc->status |= IRQ_SUSPENDED;
         }
diff --git a/kernel/kexec.c b/kernel/kexec.c
index 131b1703936f..c0613f7d6730 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -151,8 +151,10 @@ static int do_kimage_alloc(struct kimage **rimage, unsigned long entry,
         image->nr_segments = nr_segments;
         segment_bytes = nr_segments * sizeof(*segments);
         result = copy_from_user(image->segment, segments, segment_bytes);
-        if (result)
+        if (result) {
+                result = -EFAULT;
                 goto out;
+        }
 
         /*
          * Verify we have good destination addresses.  The caller is
@@ -827,7 +829,7 @@ static int kimage_load_normal_segment(struct kimage *image,
                 result = copy_from_user(ptr, buf, uchunk);
                 kunmap(page);
                 if (result) {
-                        result = (result < 0) ? result : -EIO;
+                        result = -EFAULT;
                         goto out;
                 }
                 ubytes -= uchunk;
@@ -882,7 +884,7 @@ static int kimage_load_crash_segment(struct kimage *image,
                 kexec_flush_icache_page(page);
                 kunmap(page);
                 if (result) {
-                        result = (result < 0) ? result : -EIO;
+                        result = -EFAULT;
                         goto out;
                 }
                 ubytes -= uchunk;
diff --git a/kernel/kfifo.c b/kernel/kfifo.c
index 35edbe22e9a9..6b5580c57644 100644
--- a/kernel/kfifo.c
+++ b/kernel/kfifo.c
@@ -1,8 +1,7 @@
 /*
- * A generic kernel FIFO implementation.
+ * A generic kernel FIFO implementation
  *
- * Copyright (C) 2009 Stefani Seibold <stefani@seibold.net>
- * Copyright (C) 2004 Stelian Pop <stelian@popies.net>
+ * Copyright (C) 2009/2010 Stefani Seibold <stefani@seibold.net>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -11,7 +10,7 @@
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
@@ -24,422 +23,588 @@
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/err.h>
-#include <linux/kfifo.h>
 #include <linux/log2.h>
 #include <linux/uaccess.h>
+#include <linux/kfifo.h>
 
-static void _kfifo_init(struct kfifo *fifo, void *buffer,
-                unsigned int size)
-{
-        fifo->buffer = buffer;
-        fifo->size = size;
-
-        kfifo_reset(fifo);
-}
-
-/**
- * kfifo_init - initialize a FIFO using a preallocated buffer
- * @fifo: the fifo to assign the buffer
- * @buffer: the preallocated buffer to be used.
- * @size: the size of the internal buffer, this has to be a power of 2.
- *
+/*
+ * internal helper to calculate the unused elements in a fifo
  */
-void kfifo_init(struct kfifo *fifo, void *buffer, unsigned int size)
+static inline unsigned int kfifo_unused(struct __kfifo *fifo)
 {
-        /* size must be a power of 2 */
-        BUG_ON(!is_power_of_2(size));
-
-        _kfifo_init(fifo, buffer, size);
+        return (fifo->mask + 1) - (fifo->in - fifo->out);
 }
-EXPORT_SYMBOL(kfifo_init);
 
-/**
- * kfifo_alloc - allocates a new FIFO internal buffer
- * @fifo: the fifo to assign then new buffer
- * @size: the size of the buffer to be allocated, this have to be a power of 2.
- * @gfp_mask: get_free_pages mask, passed to kmalloc()
- *
- * This function dynamically allocates a new fifo internal buffer
- *
- * The size will be rounded-up to a power of 2.
- * The buffer will be release with kfifo_free().
- * Return 0 if no error, otherwise the an error code
- */
-int kfifo_alloc(struct kfifo *fifo, unsigned int size, gfp_t gfp_mask)
+int __kfifo_alloc(struct __kfifo *fifo, unsigned int size,
+                size_t esize, gfp_t gfp_mask)
 {
-        unsigned char *buffer;
-
         /*
-         * round up to the next power of 2, since our 'let the indices
+         * round down to the next power of 2, since our 'let the indices
          * wrap' technique works only in this case.
          */
-        if (!is_power_of_2(size)) {
-                BUG_ON(size > 0x80000000);
-                size = roundup_pow_of_two(size);
+        if (!is_power_of_2(size))
+                size = rounddown_pow_of_two(size);
+
+        fifo->in = 0;
+        fifo->out = 0;
+        fifo->esize = esize;
+
+        if (size < 2) {
+                fifo->data = NULL;
+                fifo->mask = 0;
+                return -EINVAL;
         }
 
-        buffer = kmalloc(size, gfp_mask);
-        if (!buffer) {
-                _kfifo_init(fifo, NULL, 0);
+        fifo->data = kmalloc(size * esize, gfp_mask);
+
+        if (!fifo->data) {
+                fifo->mask = 0;
                 return -ENOMEM;
         }
-
-        _kfifo_init(fifo, buffer, size);
+        fifo->mask = size - 1;
 
         return 0;
 }
-EXPORT_SYMBOL(kfifo_alloc);
+EXPORT_SYMBOL(__kfifo_alloc);
 
-/**
- * kfifo_free - frees the FIFO internal buffer
- * @fifo: the fifo to be freed.
- */
-void kfifo_free(struct kfifo *fifo)
+void __kfifo_free(struct __kfifo *fifo)
 {
-        kfree(fifo->buffer);
-        _kfifo_init(fifo, NULL, 0);
+        kfree(fifo->data);
+        fifo->in = 0;
+        fifo->out = 0;
+        fifo->esize = 0;
+        fifo->data = NULL;
+        fifo->mask = 0;
 }
-EXPORT_SYMBOL(kfifo_free);
+EXPORT_SYMBOL(__kfifo_free);
 
-/**
- * kfifo_skip - skip output data
- * @fifo: the fifo to be used.
- * @len: number of bytes to skip
- */
-void kfifo_skip(struct kfifo *fifo, unsigned int len)
+int __kfifo_init(struct __kfifo *fifo, void *buffer,
+                unsigned int size, size_t esize)
 {
-        if (len < kfifo_len(fifo)) {
-                __kfifo_add_out(fifo, len);
-                return;
+        size /= esize;
+
+        if (!is_power_of_2(size))
+                size = rounddown_pow_of_two(size);
+
+        fifo->in = 0;
+        fifo->out = 0;
+        fifo->esize = esize;
+        fifo->data = buffer;
+
+        if (size < 2) {
+                fifo->mask = 0;
+                return -EINVAL;
         }
-        kfifo_reset_out(fifo);
+        fifo->mask = size - 1;
+
+        return 0;
 }
-EXPORT_SYMBOL(kfifo_skip);
+EXPORT_SYMBOL(__kfifo_init);
 
-static inline void __kfifo_in_data(struct kfifo *fifo,
-                const void *from, unsigned int len, unsigned int off)
+static void kfifo_copy_in(struct __kfifo *fifo, const void *src,
+                unsigned int len, unsigned int off)
 {
+        unsigned int size = fifo->mask + 1;
+        unsigned int esize = fifo->esize;
         unsigned int l;
 
+        off &= fifo->mask;
+        if (esize != 1) {
+                off *= esize;
+                size *= esize;
+                len *= esize;
+        }
+        l = min(len, size - off);
+
+        memcpy(fifo->data + off, src, l);
+        memcpy(fifo->data, src + l, len - l);
         /*
-         * Ensure that we sample the fifo->out index -before- we
-         * start putting bytes into the kfifo.
+         * make sure that the data in the fifo is up to date before
+         * incrementing the fifo->in index counter
          */
+        smp_wmb();
+}
 
-        smp_mb();
-
-        off = __kfifo_off(fifo, fifo->in + off);
+unsigned int __kfifo_in(struct __kfifo *fifo,
+                const void *buf, unsigned int len)
+{
+        unsigned int l;
 
-        /* first put the data starting from fifo->in to buffer end */
-        l = min(len, fifo->size - off);
-        memcpy(fifo->buffer + off, from, l);
+        l = kfifo_unused(fifo);
+        if (len > l)
+                len = l;
 
-        /* then put the rest (if any) at the beginning of the buffer */
-        memcpy(fifo->buffer, from + l, len - l);
+        kfifo_copy_in(fifo, buf, len, fifo->in);
+        fifo->in += len;
+        return len;
 }
+EXPORT_SYMBOL(__kfifo_in);
 
-static inline void __kfifo_out_data(struct kfifo *fifo,
-                void *to, unsigned int len, unsigned int off)
+static void kfifo_copy_out(struct __kfifo *fifo, void *dst,
+                unsigned int len, unsigned int off)
 {
+        unsigned int size = fifo->mask + 1;
+        unsigned int esize = fifo->esize;
         unsigned int l;
 
+        off &= fifo->mask;
+        if (esize != 1) {
+                off *= esize;
+                size *= esize;
+                len *= esize;
+        }
+        l = min(len, size - off);
+
+        memcpy(dst, fifo->data + off, l);
+        memcpy(dst + l, fifo->data, len - l);
         /*
-         * Ensure that we sample the fifo->in index -before- we
-         * start removing bytes from the kfifo.
+         * make sure that the data is copied before
+         * incrementing the fifo->out index counter
          */
+        smp_wmb();
+}
 
-        smp_rmb();
+unsigned int __kfifo_out_peek(struct __kfifo *fifo,
+                void *buf, unsigned int len)
+{
+        unsigned int l;
 
-        off = __kfifo_off(fifo, fifo->out + off);
+        l = fifo->in - fifo->out;
+        if (len > l)
+                len = l;
 
-        /* first get the data from fifo->out until the end of the buffer */
-        l = min(len, fifo->size - off);
-        memcpy(to, fifo->buffer + off, l);
+        kfifo_copy_out(fifo, buf, len, fifo->out);
+        return len;
+}
+EXPORT_SYMBOL(__kfifo_out_peek);
 
-        /* then get the rest (if any) from the beginning of the buffer */
-        memcpy(to + l, fifo->buffer, len - l);
+unsigned int __kfifo_out(struct __kfifo *fifo,
+                void *buf, unsigned int len)
+{
+        len = __kfifo_out_peek(fifo, buf, len);
+        fifo->out += len;
+        return len;
 }
+EXPORT_SYMBOL(__kfifo_out);
 
-static inline int __kfifo_from_user_data(struct kfifo *fifo,
-         const void __user *from, unsigned int len, unsigned int off,
-         unsigned *lenout)
+static unsigned long kfifo_copy_from_user(struct __kfifo *fifo,
+        const void __user *from, unsigned int len, unsigned int off,
+        unsigned int *copied)
 {
+        unsigned int size = fifo->mask + 1;
+        unsigned int esize = fifo->esize;
         unsigned int l;
-        int ret;
+        unsigned long ret;
 
+        off &= fifo->mask;
+        if (esize != 1) {
+                off *= esize;
+                size *= esize;
+                len *= esize;
+        }
+        l = min(len, size - off);
+
+        ret = copy_from_user(fifo->data + off, from, l);
+        if (unlikely(ret))
+                ret = DIV_ROUND_UP(ret + len - l, esize);
+        else {
+                ret = copy_from_user(fifo->data, from + l, len - l);
+                if (unlikely(ret))
+                        ret = DIV_ROUND_UP(ret, esize);
+        }
         /*
-         * Ensure that we sample the fifo->out index -before- we
-         * start putting bytes into the kfifo.
+         * make sure that the data in the fifo is up to date before
+         * incrementing the fifo->in index counter
          */
+        smp_wmb();
+        *copied = len - ret;
+        /* return the number of elements which are not copied */
+        return ret;
+}
 
-        smp_mb();
+int __kfifo_from_user(struct __kfifo *fifo, const void __user *from,
+                unsigned long len, unsigned int *copied)
+{
+        unsigned int l;
+        unsigned long ret;
+        unsigned int esize = fifo->esize;
+        int err;
 
-        off = __kfifo_off(fifo, fifo->in + off);
+        if (esize != 1)
+                len /= esize;
 
-        /* first put the data starting from fifo->in to buffer end */
-        l = min(len, fifo->size - off);
-        ret = copy_from_user(fifo->buffer + off, from, l);
-        if (unlikely(ret)) {
-                *lenout = ret;
-                return -EFAULT;
-        }
-        *lenout = l;
+        l = kfifo_unused(fifo);
+        if (len > l)
+                len = l;
 
-        /* then put the rest (if any) at the beginning of the buffer */
-        ret = copy_from_user(fifo->buffer, from + l, len - l);
-        *lenout += ret ? ret : len - l;
-        return ret ? -EFAULT : 0;
+        ret = kfifo_copy_from_user(fifo, from, len, fifo->in, copied);
+        if (unlikely(ret)) {
+                len -= ret;
+                err = -EFAULT;
+        } else
+                err = 0;
+        fifo->in += len;
+        return err;
 }
+EXPORT_SYMBOL(__kfifo_from_user);
 
-static inline int __kfifo_to_user_data(struct kfifo *fifo,
-                void __user *to, unsigned int len, unsigned int off, unsigned *lenout)
+static unsigned long kfifo_copy_to_user(struct __kfifo *fifo, void __user *to,
+                unsigned int len, unsigned int off, unsigned int *copied)
 {
         unsigned int l;
-        int ret;
-
+        unsigned long ret;
+        unsigned int size = fifo->mask + 1;
+        unsigned int esize = fifo->esize;
+
+        off &= fifo->mask;
+        if (esize != 1) {
+                off *= esize;
+                size *= esize;
+                len *= esize;
+        }
+        l = min(len, size - off);
+
+        ret = copy_to_user(to, fifo->data + off, l);
+        if (unlikely(ret))
+                ret = DIV_ROUND_UP(ret + len - l, esize);
+        else {
+                ret = copy_to_user(to + l, fifo->data, len - l);
+                if (unlikely(ret))
+                        ret = DIV_ROUND_UP(ret, esize);
+        }
         /*
-         * Ensure that we sample the fifo->in index -before- we
-         * start removing bytes from the kfifo.
+         * make sure that the data is copied before
+         * incrementing the fifo->out index counter
          */
+        smp_wmb();
+        *copied = len - ret;
+        /* return the number of elements which are not copied */
+        return ret;
+}
 
-        smp_rmb();
+int __kfifo_to_user(struct __kfifo *fifo, void __user *to,
+                unsigned long len, unsigned int *copied)
+{
+        unsigned int l;
+        unsigned long ret;
+        unsigned int esize = fifo->esize;
+        int err;
 
-        off = __kfifo_off(fifo, fifo->out + off);
+        if (esize != 1)
+                len /= esize;
 
-        /* first get the data from fifo->out until the end of the buffer */
-        l = min(len, fifo->size - off);
-        ret = copy_to_user(to, fifo->buffer + off, l);
-        *lenout = l;
+        l = fifo->in - fifo->out;
+        if (len > l)
+                len = l;
+        ret = kfifo_copy_to_user(fifo, to, len, fifo->out, copied);
         if (unlikely(ret)) {
-                *lenout -= ret;
-                return -EFAULT;
-        }
+                len -= ret;
+                err = -EFAULT;
+        } else
+                err = 0;
+        fifo->out += len;
+        return err;
+}
+EXPORT_SYMBOL(__kfifo_to_user);
 
-        /* then get the rest (if any) from the beginning of the buffer */
-        len -= l;
-        ret = copy_to_user(to + l, fifo->buffer, len);
-        if (unlikely(ret)) {
-                *lenout += len - ret;
-                return -EFAULT;
+static int setup_sgl_buf(struct scatterlist *sgl, void *buf,
+                int nents, unsigned int len)
+{
+        int n;
+        unsigned int l;
+        unsigned int off;
+        struct page *page;
+
+        if (!nents)
+                return 0;
+
+        if (!len)
+                return 0;
+
+        n = 0;
+        page = virt_to_page(buf);
+        off = offset_in_page(buf);
+        l = 0;
+
+        while (len >= l + PAGE_SIZE - off) {
+                struct page *npage;
+
+                l += PAGE_SIZE;
+                buf += PAGE_SIZE;
+                npage = virt_to_page(buf);
+                if (page_to_phys(page) != page_to_phys(npage) - l) {
+                        sg_set_page(sgl, page, l - off, off);
+                        sgl = sg_next(sgl);
+                        if (++n == nents || sgl == NULL)
+                                return n;
+                        page = npage;
+                        len -= l - off;
+                        l = off = 0;
+                }
         }
-        *lenout += len;
-        return 0;
+        sg_set_page(sgl, page, len, off);
+        return n + 1;
 }
 
-unsigned int __kfifo_in_n(struct kfifo *fifo,
-        const void *from, unsigned int len, unsigned int recsize)
+static unsigned int setup_sgl(struct __kfifo *fifo, struct scatterlist *sgl,
+                int nents, unsigned int len, unsigned int off)
 {
-        if (kfifo_avail(fifo) < len + recsize)
-                return len + 1;
+        unsigned int size = fifo->mask + 1;
+        unsigned int esize = fifo->esize;
+        unsigned int l;
+        unsigned int n;
 
-        __kfifo_in_data(fifo, from, len, recsize);
-        return 0;
+        off &= fifo->mask;
+        if (esize != 1) {
+                off *= esize;
+                size *= esize;
+                len *= esize;
+        }
+        l = min(len, size - off);
+
+        n = setup_sgl_buf(sgl, fifo->data + off, nents, l);
+        n += setup_sgl_buf(sgl + n, fifo->data, nents - n, len - l);
+
+        if (n)
+                sg_mark_end(sgl + n - 1);
+        return n;
 }
-EXPORT_SYMBOL(__kfifo_in_n);
 
-/**
- * kfifo_in - puts some data into the FIFO
- * @fifo: the fifo to be used.
- * @from: the data to be added.
- * @len: the length of the data to be added.
- *
- * This function copies at most @len bytes from the @from buffer into
- * the FIFO depending on the free space, and returns the number of
- * bytes copied.
- *
- * Note that with only one concurrent reader and one concurrent
- * writer, you don't need extra locking to use these functions.
- */
-unsigned int kfifo_in(struct kfifo *fifo, const void *from,
-                                unsigned int len)
+unsigned int __kfifo_dma_in_prepare(struct __kfifo *fifo,
+                struct scatterlist *sgl, int nents, unsigned int len)
 {
-        len = min(kfifo_avail(fifo), len);
+        unsigned int l;
 
-        __kfifo_in_data(fifo, from, len, 0);
-        __kfifo_add_in(fifo, len);
-        return len;
+        l = kfifo_unused(fifo);
+        if (len > l)
+                len = l;
+
+        return setup_sgl(fifo, sgl, nents, len, fifo->in);
 }
-EXPORT_SYMBOL(kfifo_in);
+EXPORT_SYMBOL(__kfifo_dma_in_prepare);
 
-unsigned int __kfifo_in_generic(struct kfifo *fifo,
-        const void *from, unsigned int len, unsigned int recsize)
+unsigned int __kfifo_dma_out_prepare(struct __kfifo *fifo,
+                struct scatterlist *sgl, int nents, unsigned int len)
 {
-        return __kfifo_in_rec(fifo, from, len, recsize);
+        unsigned int l;
+
+        l = fifo->in - fifo->out;
+        if (len > l)
+                len = l;
+
+        return setup_sgl(fifo, sgl, nents, len, fifo->out);
 }
-EXPORT_SYMBOL(__kfifo_in_generic);
+EXPORT_SYMBOL(__kfifo_dma_out_prepare);
 
-unsigned int __kfifo_out_n(struct kfifo *fifo,
-        void *to, unsigned int len, unsigned int recsize)
+unsigned int __kfifo_max_r(unsigned int len, size_t recsize)
 {
-        if (kfifo_len(fifo) < len + recsize)
-                return len;
+        unsigned int max = (1 << (recsize << 3)) - 1;
 
-        __kfifo_out_data(fifo, to, len, recsize);
-        __kfifo_add_out(fifo, len + recsize);
-        return 0;
+        if (len > max)
+                return max;
+        return len;
 }
-EXPORT_SYMBOL(__kfifo_out_n);
 
-/**
- * kfifo_out - gets some data from the FIFO
- * @fifo: the fifo to be used.
- * @to: where the data must be copied.
- * @len: the size of the destination buffer.
- *
- * This function copies at most @len bytes from the FIFO into the
- * @to buffer and returns the number of copied bytes.
- *
- * Note that with only one concurrent reader and one concurrent
- * writer, you don't need extra locking to use these functions.
+#define __KFIFO_PEEK(data, out, mask) \
+        ((data)[(out) & (mask)])
+/*
+ * __kfifo_peek_n internal helper function for determinate the length of
+ * the next record in the fifo
  */
-unsigned int kfifo_out(struct kfifo *fifo, void *to, unsigned int len)
+static unsigned int __kfifo_peek_n(struct __kfifo *fifo, size_t recsize)
 {
-        len = min(kfifo_len(fifo), len);
+        unsigned int l;
+        unsigned int mask = fifo->mask;
+        unsigned char *data = fifo->data;
 
-        __kfifo_out_data(fifo, to, len, 0);
-        __kfifo_add_out(fifo, len);
+        l = __KFIFO_PEEK(data, fifo->out, mask);
 
-        return len;
+        if (--recsize)
+                l |= __KFIFO_PEEK(data, fifo->out + 1, mask) << 8;
+
+        return l;
 }
-EXPORT_SYMBOL(kfifo_out);
 
-/**
- * kfifo_out_peek - copy some data from the FIFO, but do not remove it
- * @fifo: the fifo to be used.
- * @to: where the data must be copied.
- * @len: the size of the destination buffer.
- * @offset: offset into the fifo
- *
- * This function copies at most @len bytes at @offset from the FIFO
- * into the @to buffer and returns the number of copied bytes.
- * The data is not removed from the FIFO.
+#define __KFIFO_POKE(data, in, mask, val) \
+        ( \
+        (data)[(in) & (mask)] = (unsigned char)(val) \
+        )
+
+/*
+ * __kfifo_poke_n internal helper function for storeing the length of
+ * the record into the fifo
  */
-unsigned int kfifo_out_peek(struct kfifo *fifo, void *to, unsigned int len,
-                            unsigned offset)
+static void __kfifo_poke_n(struct __kfifo *fifo, unsigned int n, size_t recsize)
 {
-        len = min(kfifo_len(fifo), len + offset);
+        unsigned int mask = fifo->mask;
+        unsigned char *data = fifo->data;
 
-        __kfifo_out_data(fifo, to, len, offset);
-        return len;
+        __KFIFO_POKE(data, fifo->in, mask, n);
+
+        if (recsize > 1)
+                __KFIFO_POKE(data, fifo->in + 1, mask, n >> 8);
 }
-EXPORT_SYMBOL(kfifo_out_peek);
 
-unsigned int __kfifo_out_generic(struct kfifo *fifo,
-        void *to, unsigned int len, unsigned int recsize,
-        unsigned int *total)
+unsigned int __kfifo_len_r(struct __kfifo *fifo, size_t recsize)
 {
-        return __kfifo_out_rec(fifo, to, len, recsize, total);
+        return __kfifo_peek_n(fifo, recsize);
 }
-EXPORT_SYMBOL(__kfifo_out_generic);
+EXPORT_SYMBOL(__kfifo_len_r);
 
-unsigned int __kfifo_from_user_n(struct kfifo *fifo,
-        const void __user *from, unsigned int len, unsigned int recsize)
+unsigned int __kfifo_in_r(struct __kfifo *fifo, const void *buf,
+                unsigned int len, size_t recsize)
 {
-        unsigned total;
+        if (len + recsize > kfifo_unused(fifo))
+                return 0;
 
-        if (kfifo_avail(fifo) < len + recsize)
-                return len + 1;
+        __kfifo_poke_n(fifo, len, recsize);
 
-        __kfifo_from_user_data(fifo, from, len, recsize, &total);
-        return total;
+        kfifo_copy_in(fifo, buf, len, fifo->in + recsize);
+        fifo->in += len + recsize;
+        return len;
 }
-EXPORT_SYMBOL(__kfifo_from_user_n);
+EXPORT_SYMBOL(__kfifo_in_r);
 
-/**
- * kfifo_from_user - puts some data from user space into the FIFO
- * @fifo: the fifo to be used.
- * @from: pointer to the data to be added.
- * @len: the length of the data to be added.
- * @total: the actual returned data length.
- *
- * This function copies at most @len bytes from the @from into the
- * FIFO depending and returns -EFAULT/0.
- *
- * Note that with only one concurrent reader and one concurrent
- * writer, you don't need extra locking to use these functions.
- */
-int kfifo_from_user(struct kfifo *fifo,
-        const void __user *from, unsigned int len, unsigned *total)
-{
-        int ret;
-        len = min(kfifo_avail(fifo), len);
-        ret = __kfifo_from_user_data(fifo, from, len, 0, total);
-        if (ret)
-                return ret;
-        __kfifo_add_in(fifo, len);
-        return 0;
+static unsigned int kfifo_out_copy_r(struct __kfifo *fifo,
+        void *buf, unsigned int len, size_t recsize, unsigned int *n)
+{
+        *n = __kfifo_peek_n(fifo, recsize);
+
+        if (len > *n)
+                len = *n;
+
+        kfifo_copy_out(fifo, buf, len, fifo->out + recsize);
+        return len;
 }
-EXPORT_SYMBOL(kfifo_from_user);
 
-unsigned int __kfifo_from_user_generic(struct kfifo *fifo,
-        const void __user *from, unsigned int len, unsigned int recsize)
+unsigned int __kfifo_out_peek_r(struct __kfifo *fifo, void *buf,
+                unsigned int len, size_t recsize)
 {
-        return __kfifo_from_user_rec(fifo, from, len, recsize);
+        unsigned int n;
+
+        if (fifo->in == fifo->out)
+                return 0;
+
+        return kfifo_out_copy_r(fifo, buf, len, recsize, &n);
 }
-EXPORT_SYMBOL(__kfifo_from_user_generic);
+EXPORT_SYMBOL(__kfifo_out_peek_r);
 
-unsigned int __kfifo_to_user_n(struct kfifo *fifo,
-        void __user *to, unsigned int len, unsigned int reclen,
-        unsigned int recsize)
+unsigned int __kfifo_out_r(struct __kfifo *fifo, void *buf,
+                unsigned int len, size_t recsize)
 {
-        unsigned int ret, total;
+        unsigned int n;
 
-        if (kfifo_len(fifo) < reclen + recsize)
-                return len;
+        if (fifo->in == fifo->out)
+                return 0;
 
-        ret = __kfifo_to_user_data(fifo, to, reclen, recsize, &total);
+        len = kfifo_out_copy_r(fifo, buf, len, recsize, &n);
+        fifo->out += n + recsize;
+        return len;
+}
+EXPORT_SYMBOL(__kfifo_out_r);
 
-        if (likely(ret == 0))
-                __kfifo_add_out(fifo, reclen + recsize);
+void __kfifo_skip_r(struct __kfifo *fifo, size_t recsize)
+{
+        unsigned int n;
 
-        return total;
+        n = __kfifo_peek_n(fifo, recsize);
+        fifo->out += n + recsize;
 }
-EXPORT_SYMBOL(__kfifo_to_user_n);
+EXPORT_SYMBOL(__kfifo_skip_r);
 
-/**
- * kfifo_to_user - gets data from the FIFO and write it to user space
- * @fifo: the fifo to be used.
- * @to: where the data must be copied.
- * @len: the size of the destination buffer.
- * @lenout: pointer to output variable with copied data
- *
- * This function copies at most @len bytes from the FIFO into the
- * @to buffer and 0 or -EFAULT.
- *
- * Note that with only one concurrent reader and one concurrent
- * writer, you don't need extra locking to use these functions.
- */
-int kfifo_to_user(struct kfifo *fifo,
-        void __user *to, unsigned int len, unsigned *lenout)
+int __kfifo_from_user_r(struct __kfifo *fifo, const void __user *from,
+        unsigned long len, unsigned int *copied, size_t recsize)
 {
-        int ret;
-        len = min(kfifo_len(fifo), len);
-        ret = __kfifo_to_user_data(fifo, to, len, 0, lenout);
-        __kfifo_add_out(fifo, *lenout);
-        return ret;
+        unsigned long ret;
+
+        len = __kfifo_max_r(len, recsize);
+
+        if (len + recsize > kfifo_unused(fifo)) {
+                *copied = 0;
+                return 0;
+        }
+
+        __kfifo_poke_n(fifo, len, recsize);
+
+        ret = kfifo_copy_from_user(fifo, from, len, fifo->in + recsize, copied);
+        if (unlikely(ret)) {
+                *copied = 0;
+                return -EFAULT;
+        }
+        fifo->in += len + recsize;
+        return 0;
 }
-EXPORT_SYMBOL(kfifo_to_user);
+EXPORT_SYMBOL(__kfifo_from_user_r);
 
-unsigned int __kfifo_to_user_generic(struct kfifo *fifo,
-        void __user *to, unsigned int len, unsigned int recsize,
-        unsigned int *total)
+int __kfifo_to_user_r(struct __kfifo *fifo, void __user *to,
+        unsigned long len, unsigned int *copied, size_t recsize)
 {
-        return __kfifo_to_user_rec(fifo, to, len, recsize, total);
+        unsigned long ret;
+        unsigned int n;
+
+        if (fifo->in == fifo->out) {
+                *copied = 0;
+                return 0;
+        }
+
+        n = __kfifo_peek_n(fifo, recsize);
+        if (len > n)
+                len = n;
+
+        ret = kfifo_copy_to_user(fifo, to, len, fifo->out + recsize, copied);
+        if (unlikely(ret)) {
+                *copied = 0;
+                return -EFAULT;
+        }
+        fifo->out += n + recsize;
+        return 0;
 }
-EXPORT_SYMBOL(__kfifo_to_user_generic);
+EXPORT_SYMBOL(__kfifo_to_user_r);
 
-unsigned int __kfifo_peek_generic(struct kfifo *fifo, unsigned int recsize)
+unsigned int __kfifo_dma_in_prepare_r(struct __kfifo *fifo,
+        struct scatterlist *sgl, int nents, unsigned int len, size_t recsize)
 {
-        if (recsize == 0)
-                return kfifo_avail(fifo);
+        if (!nents)
+                BUG();
 
-        return __kfifo_peek_n(fifo, recsize);
+        len = __kfifo_max_r(len, recsize);
+
+        if (len + recsize > kfifo_unused(fifo))
+                return 0;
+
+        return setup_sgl(fifo, sgl, nents, len, fifo->in + recsize);
 }
-EXPORT_SYMBOL(__kfifo_peek_generic);
+EXPORT_SYMBOL(__kfifo_dma_in_prepare_r);
 
-void __kfifo_skip_generic(struct kfifo *fifo, unsigned int recsize)
+void __kfifo_dma_in_finish_r(struct __kfifo *fifo,
+        unsigned int len, size_t recsize)
 {
-        __kfifo_skip_rec(fifo, recsize);
+        len = __kfifo_max_r(len, recsize);
+        __kfifo_poke_n(fifo, len, recsize);
+        fifo->in += len + recsize;
 }
-EXPORT_SYMBOL(__kfifo_skip_generic);
+EXPORT_SYMBOL(__kfifo_dma_in_finish_r);
 
+unsigned int __kfifo_dma_out_prepare_r(struct __kfifo *fifo,
+        struct scatterlist *sgl, int nents, unsigned int len, size_t recsize)
+{
+        if (!nents)
+                BUG();
+
+        len = __kfifo_max_r(len, recsize);
+
+        if (len + recsize > fifo->in - fifo->out)
+                return 0;
+
+        return setup_sgl(fifo, sgl, nents, len, fifo->out + recsize);
+}
+EXPORT_SYMBOL(__kfifo_dma_out_prepare_r);
+
+void __kfifo_dma_out_finish_r(struct __kfifo *fifo, size_t recsize)
+{
+        unsigned int len;
+
+        len = __kfifo_peek_n(fifo, recsize);
+        fifo->out += len + recsize;
+}
+EXPORT_SYMBOL(__kfifo_dma_out_finish_r);
diff --git a/kernel/kmod.c b/kernel/kmod.c
index 6e9b19667a8d..9cd0591c96a2 100644
--- a/kernel/kmod.c
+++ b/kernel/kmod.c
@@ -153,7 +153,9 @@ static int ____call_usermodehelper(void *data)
                         goto fail;
         }
 
-        retval = kernel_execve(sub_info->path, sub_info->argv, sub_info->envp);
+        retval = kernel_execve(sub_info->path,
+                               (const char *const *)sub_info->argv,
+                               (const char *const *)sub_info->envp);
 
         /* Exec failed? */
 fail:
diff --git a/kernel/kthread.c b/kernel/kthread.c
index 83911c780175..2dc3786349d1 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -14,6 +14,8 @@
 #include <linux/file.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
+#include <linux/slab.h>
+#include <linux/freezer.h>
 #include <trace/events/sched.h>
 
 static DEFINE_SPINLOCK(kthread_create_lock);
@@ -35,6 +37,7 @@ struct kthread_create_info
 
 struct kthread {
         int should_stop;
+        void *data;
         struct completion exited;
 };
 
@@ -54,6 +57,19 @@ int kthread_should_stop(void)
 }
 EXPORT_SYMBOL(kthread_should_stop);
 
+/**
+ * kthread_data - return data value specified on kthread creation
+ * @task: kthread task in question
+ *
+ * Return the data value specified when kthread @task was created.
+ * The caller is responsible for ensuring the validity of @task when
+ * calling this function.
+ */
+void *kthread_data(struct task_struct *task)
+{
+        return to_kthread(task)->data;
+}
+
 static int kthread(void *_create)
 {
         /* Copy data: it's on kthread's stack */
@@ -64,6 +80,7 @@ static int kthread(void *_create)
         int ret;
 
         self.should_stop = 0;
+        self.data = data;
         init_completion(&self.exited);
         current->vfork_done = &self.exited;
 
@@ -247,3 +264,150 @@ int kthreadd(void *unused)
 
         return 0;
 }
+
+/**
+ * kthread_worker_fn - kthread function to process kthread_worker
+ * @worker_ptr: pointer to initialized kthread_worker
+ *
+ * This function can be used as @threadfn to kthread_create() or
+ * kthread_run() with @worker_ptr argument pointing to an initialized
+ * kthread_worker.  The started kthread will process work_list until
+ * the it is stopped with kthread_stop().  A kthread can also call
+ * this function directly after extra initialization.
+ *
+ * Different kthreads can be used for the same kthread_worker as long
+ * as there's only one kthread attached to it at any given time.  A
+ * kthread_worker without an attached kthread simply collects queued
+ * kthread_works.
+ */
+int kthread_worker_fn(void *worker_ptr)
+{
+        struct kthread_worker *worker = worker_ptr;
+        struct kthread_work *work;
+
+        WARN_ON(worker->task);
+        worker->task = current;
+repeat:
+        set_current_state(TASK_INTERRUPTIBLE);  /* mb paired w/ kthread_stop */
+
+        if (kthread_should_stop()) {
+                __set_current_state(TASK_RUNNING);
+                spin_lock_irq(&worker->lock);
+                worker->task = NULL;
+                spin_unlock_irq(&worker->lock);
+                return 0;
+        }
+
+        work = NULL;
+        spin_lock_irq(&worker->lock);
+        if (!list_empty(&worker->work_list)) {
+                work = list_first_entry(&worker->work_list,
+                                        struct kthread_work, node);
+                list_del_init(&work->node);
+        }
+        spin_unlock_irq(&worker->lock);
+
+        if (work) {
+                __set_current_state(TASK_RUNNING);
+                work->func(work);
+                smp_wmb();      /* wmb worker-b0 paired with flush-b1 */
+                work->done_seq = work->queue_seq;
+                smp_mb();       /* mb worker-b1 paired with flush-b0 */
+                if (atomic_read(&work->flushing))
+                        wake_up_all(&work->done);
+        } else if (!freezing(current))
+                schedule();
+
+        try_to_freeze();
+        goto repeat;
+}
+EXPORT_SYMBOL_GPL(kthread_worker_fn);
+
+/**
+ * queue_kthread_work - queue a kthread_work
+ * @worker: target kthread_worker
+ * @work: kthread_work to queue
+ *
+ * Queue @work to work processor @task for async execution.  @task
+ * must have been created with kthread_worker_create().  Returns %true
+ * if @work was successfully queued, %false if it was already pending.
+ */
+bool queue_kthread_work(struct kthread_worker *worker,
+                        struct kthread_work *work)
+{
+        bool ret = false;
+        unsigned long flags;
+
+        spin_lock_irqsave(&worker->lock, flags);
+        if (list_empty(&work->node)) {
+                list_add_tail(&work->node, &worker->work_list);
+                work->queue_seq++;
+                if (likely(worker->task))
+                        wake_up_process(worker->task);
+                ret = true;
+        }
+        spin_unlock_irqrestore(&worker->lock, flags);
+        return ret;
+}
+EXPORT_SYMBOL_GPL(queue_kthread_work);
+
+/**
+ * flush_kthread_work - flush a kthread_work
+ * @work: work to flush
+ *
+ * If @work is queued or executing, wait for it to finish execution.
+ */
+void flush_kthread_work(struct kthread_work *work)
+{
+        int seq = work->queue_seq;
+
+        atomic_inc(&work->flushing);
+
+        /*
+         * mb flush-b0 paired with worker-b1, to make sure either
+         * worker sees the above increment or we see done_seq update.
+         */
+        smp_mb__after_atomic_inc();
+
+        /* A - B <= 0 tests whether B is in front of A regardless of overflow */
+        wait_event(work->done, seq - work->done_seq <= 0);
+        atomic_dec(&work->flushing);
+
+        /*
+         * rmb flush-b1 paired with worker-b0, to make sure our caller
+         * sees every change made by work->func().
+         */
+        smp_mb__after_atomic_dec();
+}
+EXPORT_SYMBOL_GPL(flush_kthread_work);
+
+struct kthread_flush_work {
+        struct kthread_work     work;
+        struct completion       done;
+};
+
+static void kthread_flush_work_fn(struct kthread_work *work)
+{
+        struct kthread_flush_work *fwork =
+                container_of(work, struct kthread_flush_work, work);
+        complete(&fwork->done);
+}
+
+/**
+ * flush_kthread_worker - flush all current works on a kthread_worker
+ * @worker: worker to flush
+ *
+ * Wait until all currently executing or pending works on @worker are
+ * finished.
+ */
+void flush_kthread_worker(struct kthread_worker *worker)
+{
+        struct kthread_flush_work fwork = {
+                KTHREAD_WORK_INIT(fwork.work, kthread_flush_work_fn),
+                COMPLETION_INITIALIZER_ONSTACK(fwork.done),
+        };
+
+        queue_kthread_work(worker, &fwork.work);
+        wait_for_completion(&fwork.done);
+}
+EXPORT_SYMBOL_GPL(flush_kthread_worker);
diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index 54286798c37b..f2852a510232 100644
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -146,7 +146,7 @@ static DEFINE_PER_CPU(struct lock_class_stats[MAX_LOCKDEP_KEYS],
 
 static inline u64 lockstat_clock(void)
 {
-        return cpu_clock(smp_processor_id());
+        return local_clock();
 }
 
 static int lock_point(unsigned long points[], unsigned long ip)
diff --git a/kernel/module.c b/kernel/module.c
index 6c562828c85c..d0b5f8db11b4 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -1,6 +1,6 @@
 /*
    Copyright (C) 2002 Richard Henderson
-   Copyright (C) 2001 Rusty Russell, 2002 Rusty Russell IBM.
+   Copyright (C) 2001 Rusty Russell, 2002, 2010 Rusty Russell IBM.
 
     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
@@ -110,6 +110,20 @@ int unregister_module_notifier(struct notifier_block * nb)
 }
 EXPORT_SYMBOL(unregister_module_notifier);
 
+struct load_info {
+        Elf_Ehdr *hdr;
+        unsigned long len;
+        Elf_Shdr *sechdrs;
+        char *secstrings, *strtab;
+        unsigned long *strmap;
+        unsigned long symoffs, stroffs;
+        struct _ddebug *debug;
+        unsigned int num_debug;
+        struct {
+                unsigned int sym, str, mod, vers, info, pcpu;
+        } index;
+};
+
 /* We require a truly strong try_module_get(): 0 means failure due to
    ongoing or failed initialization etc. */
 static inline int strong_try_module_get(struct module *mod)
@@ -140,42 +154,38 @@ void __module_put_and_exit(struct module *mod, long code)
 EXPORT_SYMBOL(__module_put_and_exit);
 
 /* Find a module section: 0 means not found. */
-static unsigned int find_sec(Elf_Ehdr *hdr,
-                             Elf_Shdr *sechdrs,
-                             const char *secstrings,
-                             const char *name)
+static unsigned int find_sec(const struct load_info *info, const char *name)
 {
         unsigned int i;
 
-        for (i = 1; i < hdr->e_shnum; i++)
+        for (i = 1; i < info->hdr->e_shnum; i++) {
+                Elf_Shdr *shdr = &info->sechdrs[i];
                 /* Alloc bit cleared means "ignore it." */
-                if ((sechdrs[i].sh_flags & SHF_ALLOC)
-                    && strcmp(secstrings+sechdrs[i].sh_name, name) == 0)
+                if ((shdr->sh_flags & SHF_ALLOC)
+                    && strcmp(info->secstrings + shdr->sh_name, name) == 0)
                         return i;
+        }
         return 0;
 }
 
 /* Find a module section, or NULL. */
-static void *section_addr(Elf_Ehdr *hdr, Elf_Shdr *shdrs,
-                          const char *secstrings, const char *name)
+static void *section_addr(const struct load_info *info, const char *name)
 {
         /* Section 0 has sh_addr 0. */
-        return (void *)shdrs[find_sec(hdr, shdrs, secstrings, name)].sh_addr;
+        return (void *)info->sechdrs[find_sec(info, name)].sh_addr;
 }
 
 /* Find a module section, or NULL.  Fill in number of "objects" in section. */
-static void *section_objs(Elf_Ehdr *hdr,
-                          Elf_Shdr *sechdrs,
-                          const char *secstrings,
+static void *section_objs(const struct load_info *info,
                           const char *name,
                           size_t object_size,
                           unsigned int *num)
 {
-        unsigned int sec = find_sec(hdr, sechdrs, secstrings, name);
+        unsigned int sec = find_sec(info, name);
 
         /* Section 0 has sh_addr 0 and sh_size 0. */
-        *num = sechdrs[sec].sh_size / object_size;
-        return (void *)sechdrs[sec].sh_addr;
+        *num = info->sechdrs[sec].sh_size / object_size;
+        return (void *)info->sechdrs[sec].sh_addr;
 }
 
 /* Provided by the linker */
@@ -227,7 +237,7 @@ bool each_symbol(bool (*fn)(const struct symsearch *arr, struct module *owner,
                             unsigned int symnum, void *data), void *data)
 {
         struct module *mod;
-        const struct symsearch arr[] = {
+        static const struct symsearch arr[] = {
                 { __start___ksymtab, __stop___ksymtab, __start___kcrctab,
                   NOT_GPL_ONLY, false },
                 { __start___ksymtab_gpl, __stop___ksymtab_gpl,
@@ -392,7 +402,8 @@ static int percpu_modalloc(struct module *mod,
         mod->percpu = __alloc_reserved_percpu(size, align);
         if (!mod->percpu) {
                 printk(KERN_WARNING
-                       "Could not allocate %lu bytes percpu data\n", size);
+                       "%s: Could not allocate %lu bytes percpu data\n",
+                       mod->name, size);
                 return -ENOMEM;
         }
         mod->percpu_size = size;
@@ -404,11 +415,9 @@ static void percpu_modfree(struct module *mod)
         free_percpu(mod->percpu);
 }
 
-static unsigned int find_pcpusec(Elf_Ehdr *hdr,
-                                 Elf_Shdr *sechdrs,
-                                 const char *secstrings)
+static unsigned int find_pcpusec(struct load_info *info)
 {
-        return find_sec(hdr, sechdrs, secstrings, ".data..percpu");
+        return find_sec(info, ".data..percpu");
 }
 
 static void percpu_modcopy(struct module *mod,
@@ -468,9 +477,7 @@ static inline int percpu_modalloc(struct module *mod,
 static inline void percpu_modfree(struct module *mod)
 {
 }
-static inline unsigned int find_pcpusec(Elf_Ehdr *hdr,
-                                        Elf_Shdr *sechdrs,
-                                        const char *secstrings)
+static unsigned int find_pcpusec(struct load_info *info)
 {
         return 0;
 }
@@ -524,21 +531,21 @@ static char last_unloaded_module[MODULE_NAME_LEN+1];
 EXPORT_TRACEPOINT_SYMBOL(module_get);
 
 /* Init the unload section of the module. */
-static void module_unload_init(struct module *mod)
+static int module_unload_init(struct module *mod)
 {
-        int cpu;
+        mod->refptr = alloc_percpu(struct module_ref);
+        if (!mod->refptr)
+                return -ENOMEM;
 
         INIT_LIST_HEAD(&mod->source_list);
         INIT_LIST_HEAD(&mod->target_list);
-        for_each_possible_cpu(cpu) {
-                per_cpu_ptr(mod->refptr, cpu)->incs = 0;
-                per_cpu_ptr(mod->refptr, cpu)->decs = 0;
-        }
 
         /* Hold reference count during initialization. */
         __this_cpu_write(mod->refptr->incs, 1);
         /* Backwards compatibility macros put refcount during init. */
         mod->waiter = current;
+
+        return 0;
 }
 
 /* Does a already use b? */
@@ -618,6 +625,8 @@ static void module_unload_free(struct module *mod)
                 kfree(use);
         }
         mutex_unlock(&module_mutex);
+
+        free_percpu(mod->refptr);
 }
 
 #ifdef CONFIG_MODULE_FORCE_UNLOAD
@@ -891,8 +900,9 @@ int ref_module(struct module *a, struct module *b)
 }
 EXPORT_SYMBOL_GPL(ref_module);
 
-static inline void module_unload_init(struct module *mod)
+static inline int module_unload_init(struct module *mod)
 {
+        return 0;
 }
 #endif /* CONFIG_MODULE_UNLOAD */
 
@@ -1051,10 +1061,9 @@ static inline int same_magic(const char *amagic, const char *bmagic,
 #endif /* CONFIG_MODVERSIONS */
 
 /* Resolve a symbol for this module.  I.e. if we find one, record usage. */
-static const struct kernel_symbol *resolve_symbol(Elf_Shdr *sechdrs,
-                                                  unsigned int versindex,
+static const struct kernel_symbol *resolve_symbol(struct module *mod,
+                                                  const struct load_info *info,
                                                   const char *name,
-                                                  struct module *mod,
                                                   char ownername[])
 {
         struct module *owner;
@@ -1068,7 +1077,8 @@ static const struct kernel_symbol *resolve_symbol(Elf_Shdr *sechdrs,
         if (!sym)
                 goto unlock;
 
-        if (!check_version(sechdrs, versindex, name, mod, crc, owner)) {
+        if (!check_version(info->sechdrs, info->index.vers, name, mod, crc,
+                           owner)) {
                 sym = ERR_PTR(-EINVAL);
                 goto getname;
         }
@@ -1087,21 +1097,20 @@ unlock:
         return sym;
 }
 
-static const struct kernel_symbol *resolve_symbol_wait(Elf_Shdr *sechdrs,
-                                                       unsigned int versindex,
-                                                       const char *name,
-                                                       struct module *mod)
+static const struct kernel_symbol *
+resolve_symbol_wait(struct module *mod,
+                    const struct load_info *info,
+                    const char *name)
 {
         const struct kernel_symbol *ksym;
-        char ownername[MODULE_NAME_LEN];
+        char owner[MODULE_NAME_LEN];
 
         if (wait_event_interruptible_timeout(module_wq,
-                        !IS_ERR(ksym = resolve_symbol(sechdrs, versindex, name,
-                                                      mod, ownername)) ||
-                        PTR_ERR(ksym) != -EBUSY,
+                        !IS_ERR(ksym = resolve_symbol(mod, info, name, owner))
+                        || PTR_ERR(ksym) != -EBUSY,
                                              30 * HZ) <= 0) {
                 printk(KERN_WARNING "%s: gave up waiting for init of module %s.\n",
-                       mod->name, ownername);
+                       mod->name, owner);
         }
         return ksym;
 }
@@ -1110,8 +1119,9 @@ static const struct kernel_symbol *resolve_symbol_wait(Elf_Shdr *sechdrs,
  * /sys/module/foo/sections stuff
  * J. Corbet <corbet@lwn.net>
  */
-#if defined(CONFIG_KALLSYMS) && defined(CONFIG_SYSFS)
+#ifdef CONFIG_SYSFS
 
+#ifdef CONFIG_KALLSYMS
 static inline bool sect_empty(const Elf_Shdr *sect)
 {
         return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0;
@@ -1148,8 +1158,7 @@ static void free_sect_attrs(struct module_sect_attrs *sect_attrs)
         kfree(sect_attrs);
 }
 
-static void add_sect_attrs(struct module *mod, unsigned int nsect,
-                char *secstrings, Elf_Shdr *sechdrs)
+static void add_sect_attrs(struct module *mod, const struct load_info *info)
 {
         unsigned int nloaded = 0, i, size[2];
         struct module_sect_attrs *sect_attrs;
@@ -1157,8 +1166,8 @@ static void add_sect_attrs(struct module *mod, unsigned int nsect,
         struct attribute **gattr;
 
         /* Count loaded sections and allocate structures */
-        for (i = 0; i < nsect; i++)
-                if (!sect_empty(&sechdrs[i]))
+        for (i = 0; i < info->hdr->e_shnum; i++)
+                if (!sect_empty(&info->sechdrs[i]))
                         nloaded++;
         size[0] = ALIGN(sizeof(*sect_attrs)
                         + nloaded * sizeof(sect_attrs->attrs[0]),
@@ -1175,11 +1184,12 @@ static void add_sect_attrs(struct module *mod, unsigned int nsect,
         sect_attrs->nsections = 0;
         sattr = &sect_attrs->attrs[0];
         gattr = &sect_attrs->grp.attrs[0];
-        for (i = 0; i < nsect; i++) {
-                if (sect_empty(&sechdrs[i]))
+        for (i = 0; i < info->hdr->e_shnum; i++) {
+                Elf_Shdr *sec = &info->sechdrs[i];
+                if (sect_empty(sec))
                         continue;
-                sattr->address = sechdrs[i].sh_addr;
-                sattr->name = kstrdup(secstrings + sechdrs[i].sh_name,
+                sattr->address = sec->sh_addr;
+                sattr->name = kstrdup(info->secstrings + sec->sh_name,
                                         GFP_KERNEL);
                 if (sattr->name == NULL)
                         goto out;
@@ -1247,8 +1257,7 @@ static void free_notes_attrs(struct module_notes_attrs *notes_attrs,
         kfree(notes_attrs);
 }
 
-static void add_notes_attrs(struct module *mod, unsigned int nsect,
-                            char *secstrings, Elf_Shdr *sechdrs)
+static void add_notes_attrs(struct module *mod, const struct load_info *info)
 {
         unsigned int notes, loaded, i;
         struct module_notes_attrs *notes_attrs;
@@ -1260,9 +1269,9 @@ static void add_notes_attrs(struct module *mod, unsigned int nsect,
 
         /* Count notes sections and allocate structures.  */
         notes = 0;
-        for (i = 0; i < nsect; i++)
-                if (!sect_empty(&sechdrs[i]) &&
-                    (sechdrs[i].sh_type == SHT_NOTE))
+        for (i = 0; i < info->hdr->e_shnum; i++)
+                if (!sect_empty(&info->sechdrs[i]) &&
+                    (info->sechdrs[i].sh_type == SHT_NOTE))
                         ++notes;
 
         if (notes == 0)
@@ -1276,15 +1285,15 @@ static void add_notes_attrs(struct module *mod, unsigned int nsect,
 
         notes_attrs->notes = notes;
         nattr = &notes_attrs->attrs[0];
-        for (loaded = i = 0; i < nsect; ++i) {
-                if (sect_empty(&sechdrs[i]))
+        for (loaded = i = 0; i < info->hdr->e_shnum; ++i) {
+                if (sect_empty(&info->sechdrs[i]))
                         continue;
-                if (sechdrs[i].sh_type == SHT_NOTE) {
+                if (info->sechdrs[i].sh_type == SHT_NOTE) {
                         sysfs_bin_attr_init(nattr);
                         nattr->attr.name = mod->sect_attrs->attrs[loaded].name;
                         nattr->attr.mode = S_IRUGO;
-                        nattr->size = sechdrs[i].sh_size;
-                        nattr->private = (void *) sechdrs[i].sh_addr;
+                        nattr->size = info->sechdrs[i].sh_size;
+                        nattr->private = (void *) info->sechdrs[i].sh_addr;
                         nattr->read = module_notes_read;
                         ++nattr;
                 }
@@ -1315,8 +1324,8 @@ static void remove_notes_attrs(struct module *mod)
 
 #else
 
-static inline void add_sect_attrs(struct module *mod, unsigned int nsect,
-                char *sectstrings, Elf_Shdr *sechdrs)
+static inline void add_sect_attrs(struct module *mod,
+                                  const struct load_info *info)
 {
 }
 
@@ -1324,17 +1333,16 @@ static inline void remove_sect_attrs(struct module *mod)
 {
 }
 
-static inline void add_notes_attrs(struct module *mod, unsigned int nsect,
-                                   char *sectstrings, Elf_Shdr *sechdrs)
+static inline void add_notes_attrs(struct module *mod,
+                                   const struct load_info *info)
 {
 }
 
 static inline void remove_notes_attrs(struct module *mod)
 {
 }
-#endif
+#endif /* CONFIG_KALLSYMS */
 
-#ifdef CONFIG_SYSFS
 static void add_usage_links(struct module *mod)
 {
 #ifdef CONFIG_MODULE_UNLOAD
@@ -1439,6 +1447,7 @@ out:
 }
 
 static int mod_sysfs_setup(struct module *mod,
+                           const struct load_info *info,
                            struct kernel_param *kparam,
                            unsigned int num_params)
 {
@@ -1463,6 +1472,8 @@ static int mod_sysfs_setup(struct module *mod,
                 goto out_unreg_param;
 
         add_usage_links(mod);
+        add_sect_attrs(mod, info);
+        add_notes_attrs(mod, info);
 
         kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD);
         return 0;
@@ -1479,33 +1490,26 @@ out:
 
 static void mod_sysfs_fini(struct module *mod)
 {
+        remove_notes_attrs(mod);
+        remove_sect_attrs(mod);
         kobject_put(&mod->mkobj.kobj);
 }
 
-#else /* CONFIG_SYSFS */
-
-static inline int mod_sysfs_init(struct module *mod)
-{
-        return 0;
-}
+#else /* !CONFIG_SYSFS */
 
-static inline int mod_sysfs_setup(struct module *mod,
+static int mod_sysfs_setup(struct module *mod,
+                           const struct load_info *info,
                            struct kernel_param *kparam,
                            unsigned int num_params)
 {
         return 0;
 }
 
-static inline int module_add_modinfo_attrs(struct module *mod)
-{
-        return 0;
-}
-
-static inline void module_remove_modinfo_attrs(struct module *mod)
+static void mod_sysfs_fini(struct module *mod)
 {
 }
 
-static void mod_sysfs_fini(struct module *mod)
+static void module_remove_modinfo_attrs(struct module *mod)
 {
 }
 
@@ -1515,7 +1519,7 @@ static void del_usage_links(struct module *mod)
 
 #endif /* CONFIG_SYSFS */
 
-static void mod_kobject_remove(struct module *mod)
+static void mod_sysfs_teardown(struct module *mod)
 {
         del_usage_links(mod);
         module_remove_modinfo_attrs(mod);
@@ -1545,9 +1549,7 @@ static void free_module(struct module *mod)
         mutex_lock(&module_mutex);
         stop_machine(__unlink_module, mod, NULL);
         mutex_unlock(&module_mutex);
-        remove_notes_attrs(mod);
-        remove_sect_attrs(mod);
-        mod_kobject_remove(mod);
+        mod_sysfs_teardown(mod);
 
         /* Remove dynamic debug info */
         ddebug_remove_module(mod->name);
@@ -1565,10 +1567,7 @@ static void free_module(struct module *mod)
         module_free(mod, mod->module_init);
         kfree(mod->args);
         percpu_modfree(mod);
-#if defined(CONFIG_MODULE_UNLOAD)
-        if (mod->refptr)
-                free_percpu(mod->refptr);
-#endif
+
         /* Free lock-classes: */
         lockdep_free_key_range(mod->module_core, mod->core_size);
 
@@ -1634,25 +1633,23 @@ static int verify_export_symbols(struct module *mod)
 }
 
 /* Change all symbols so that st_value encodes the pointer directly. */
-static int simplify_symbols(Elf_Shdr *sechdrs,
-                            unsigned int symindex,
-                            const char *strtab,
-                            unsigned int versindex,
-                            unsigned int pcpuindex,
-                            struct module *mod)
-{
-        Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
+static int simplify_symbols(struct module *mod, const struct load_info *info)
+{
+        Elf_Shdr *symsec = &info->sechdrs[info->index.sym];
+        Elf_Sym *sym = (void *)symsec->sh_addr;
         unsigned long secbase;
-        unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
+        unsigned int i;
         int ret = 0;
         const struct kernel_symbol *ksym;
 
-        for (i = 1; i < n; i++) {
+        for (i = 1; i < symsec->sh_size / sizeof(Elf_Sym); i++) {
+                const char *name = info->strtab + sym[i].st_name;
+
                 switch (sym[i].st_shndx) {
                 case SHN_COMMON:
                         /* We compiled with -fno-common.  These are not
                            supposed to happen.  */
-                        DEBUGP("Common symbol: %s\n", strtab + sym[i].st_name);
+                        DEBUGP("Common symbol: %s\n", name);
                         printk("%s: please compile with -fno-common\n",
                                mod->name);
                         ret = -ENOEXEC;
@@ -1665,9 +1662,7 @@ static int simplify_symbols(Elf_Shdr *sechdrs,
                         break;
 
                 case SHN_UNDEF:
-                        ksym = resolve_symbol_wait(sechdrs, versindex,
-                                                   strtab + sym[i].st_name,
-                                                   mod);
+                        ksym = resolve_symbol_wait(mod, info, name);
                         /* Ok if resolved.  */
                         if (ksym && !IS_ERR(ksym)) {
                                 sym[i].st_value = ksym->value;
@@ -1679,17 +1674,16 @@ static int simplify_symbols(Elf_Shdr *sechdrs,
                                 break;
 
                         printk(KERN_WARNING "%s: Unknown symbol %s (err %li)\n",
-                               mod->name, strtab + sym[i].st_name,
-                               PTR_ERR(ksym));
+                               mod->name, name, PTR_ERR(ksym));
                         ret = PTR_ERR(ksym) ?: -ENOENT;
                         break;
 
                 default:
                         /* Divert to percpu allocation if a percpu var. */
-                        if (sym[i].st_shndx == pcpuindex)
+                        if (sym[i].st_shndx == info->index.pcpu)
                                 secbase = (unsigned long)mod_percpu(mod);
                         else
-                                secbase = sechdrs[sym[i].st_shndx].sh_addr;
+                                secbase = info->sechdrs[sym[i].st_shndx].sh_addr;
                         sym[i].st_value += secbase;
                         break;
                 }
@@ -1698,6 +1692,35 @@ static int simplify_symbols(Elf_Shdr *sechdrs,
         return ret;
 }
 
+static int apply_relocations(struct module *mod, const struct load_info *info)
+{
+        unsigned int i;
+        int err = 0;
+
+        /* Now do relocations. */
+        for (i = 1; i < info->hdr->e_shnum; i++) {
+                unsigned int infosec = info->sechdrs[i].sh_info;
+
+                /* Not a valid relocation section? */
+                if (infosec >= info->hdr->e_shnum)
+                        continue;
+
+                /* Don't bother with non-allocated sections */
+                if (!(info->sechdrs[infosec].sh_flags & SHF_ALLOC))
+                        continue;
+
+                if (info->sechdrs[i].sh_type == SHT_REL)
+                        err = apply_relocate(info->sechdrs, info->strtab,
+                                             info->index.sym, i, mod);
+                else if (info->sechdrs[i].sh_type == SHT_RELA)
+                        err = apply_relocate_add(info->sechdrs, info->strtab,
+                                                 info->index.sym, i, mod);
+                if (err < 0)
+                        break;
+        }
+        return err;
+}
+
 /* Additional bytes needed by arch in front of individual sections */
 unsigned int __weak arch_mod_section_prepend(struct module *mod,
                                              unsigned int section)
@@ -1722,10 +1745,7 @@ static long get_offset(struct module *mod, unsigned int *size,
    might -- code, read-only data, read-write data, small data.  Tally
    sizes, and place the offsets into sh_entsize fields: high bit means it
    belongs in init. */
-static void layout_sections(struct module *mod,
-                            const Elf_Ehdr *hdr,
-                            Elf_Shdr *sechdrs,
-                            const char *secstrings)
+static void layout_sections(struct module *mod, struct load_info *info)
 {
         static unsigned long const masks[][2] = {
                 /* NOTE: all executable code must be the first section
@@ -1738,21 +1758,22 @@ static void layout_sections(struct module *mod,
         };
         unsigned int m, i;
 
-        for (i = 0; i < hdr->e_shnum; i++)
-                sechdrs[i].sh_entsize = ~0UL;
+        for (i = 0; i < info->hdr->e_shnum; i++)
+                info->sechdrs[i].sh_entsize = ~0UL;
 
         DEBUGP("Core section allocation order:\n");
         for (m = 0; m < ARRAY_SIZE(masks); ++m) {
-                for (i = 0; i < hdr->e_shnum; ++i) {
-                        Elf_Shdr *s = &sechdrs[i];
+                for (i = 0; i < info->hdr->e_shnum; ++i) {
+                        Elf_Shdr *s = &info->sechdrs[i];
+                        const char *sname = info->secstrings + s->sh_name;
 
                         if ((s->sh_flags & masks[m][0]) != masks[m][0]
                             || (s->sh_flags & masks[m][1])
                             || s->sh_entsize != ~0UL
-                            || strstarts(secstrings + s->sh_name, ".init"))
+                            || strstarts(sname, ".init"))
                                 continue;
                         s->sh_entsize = get_offset(mod, &mod->core_size, s, i);
-                        DEBUGP("\t%s\n", secstrings + s->sh_name);
+                        DEBUGP("\t%s\n", name);
                 }
                 if (m == 0)
                         mod->core_text_size = mod->core_size;
@@ -1760,17 +1781,18 @@ static void layout_sections(struct module *mod,
 
         DEBUGP("Init section allocation order:\n");
         for (m = 0; m < ARRAY_SIZE(masks); ++m) {
-                for (i = 0; i < hdr->e_shnum; ++i) {
-                        Elf_Shdr *s = &sechdrs[i];
+                for (i = 0; i < info->hdr->e_shnum; ++i) {
+                        Elf_Shdr *s = &info->sechdrs[i];
+                        const char *sname = info->secstrings + s->sh_name;
 
                         if ((s->sh_flags & masks[m][0]) != masks[m][0]
                             || (s->sh_flags & masks[m][1])
                             || s->sh_entsize != ~0UL
-                            || !strstarts(secstrings + s->sh_name, ".init"))
+                            || !strstarts(sname, ".init"))
                                 continue;
                         s->sh_entsize = (get_offset(mod, &mod->init_size, s, i)
                                          | INIT_OFFSET_MASK);
-                        DEBUGP("\t%s\n", secstrings + s->sh_name);
+                        DEBUGP("\t%s\n", sname);
                 }
                 if (m == 0)
                         mod->init_text_size = mod->init_size;
@@ -1809,33 +1831,28 @@ static char *next_string(char *string, unsigned long *secsize)
         return string;
 }
 
-static char *get_modinfo(Elf_Shdr *sechdrs,
-                         unsigned int info,
-                         const char *tag)
+static char *get_modinfo(struct load_info *info, const char *tag)
 {
         char *p;
         unsigned int taglen = strlen(tag);
-        unsigned long size = sechdrs[info].sh_size;
+        Elf_Shdr *infosec = &info->sechdrs[info->index.info];
+        unsigned long size = infosec->sh_size;
 
-        for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) {
+        for (p = (char *)infosec->sh_addr; p; p = next_string(p, &size)) {
                 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
                         return p + taglen + 1;
         }
         return NULL;
 }
 
-static void setup_modinfo(struct module *mod, Elf_Shdr *sechdrs,
-                          unsigned int infoindex)
+static void setup_modinfo(struct module *mod, struct load_info *info)
 {
         struct module_attribute *attr;
         int i;
 
         for (i = 0; (attr = modinfo_attrs[i]); i++) {
                 if (attr->setup)
-                        attr->setup(mod,
-                                    get_modinfo(sechdrs,
-                                                infoindex,
-                                                attr->attr.name));
+                        attr->setup(mod, get_modinfo(info, attr->attr.name));
         }
 }
 
@@ -1876,11 +1893,10 @@ static int is_exported(const char *name, unsigned long value,
 }
 
 /* As per nm */
-static char elf_type(const Elf_Sym *sym,
-                     Elf_Shdr *sechdrs,
-                     const char *secstrings,
-                     struct module *mod)
+static char elf_type(const Elf_Sym *sym, const struct load_info *info)
 {
+        const Elf_Shdr *sechdrs = info->sechdrs;
+
         if (ELF_ST_BIND(sym->st_info) == STB_WEAK) {
                 if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT)
                         return 'v';
@@ -1910,8 +1926,10 @@ static char elf_type(const Elf_Sym *sym,
                 else
                         return 'b';
         }
-        if (strstarts(secstrings + sechdrs[sym->st_shndx].sh_name, ".debug"))
+        if (strstarts(info->secstrings + sechdrs[sym->st_shndx].sh_name,
+                      ".debug")) {
                 return 'n';
+        }
         return '?';
 }
 
@@ -1936,127 +1954,96 @@ static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs,
         return true;
 }
 
-static unsigned long layout_symtab(struct module *mod,
-                                   Elf_Shdr *sechdrs,
-                                   unsigned int symindex,
-                                   unsigned int strindex,
-                                   const Elf_Ehdr *hdr,
-                                   const char *secstrings,
-                                   unsigned long *pstroffs,
-                                   unsigned long *strmap)
+static void layout_symtab(struct module *mod, struct load_info *info)
 {
-        unsigned long symoffs;
-        Elf_Shdr *symsect = sechdrs + symindex;
-        Elf_Shdr *strsect = sechdrs + strindex;
+        Elf_Shdr *symsect = info->sechdrs + info->index.sym;
+        Elf_Shdr *strsect = info->sechdrs + info->index.str;
         const Elf_Sym *src;
-        const char *strtab;
         unsigned int i, nsrc, ndst;
 
         /* Put symbol section at end of init part of module. */
         symsect->sh_flags |= SHF_ALLOC;
         symsect->sh_entsize = get_offset(mod, &mod->init_size, symsect,
-                                         symindex) | INIT_OFFSET_MASK;
-        DEBUGP("\t%s\n", secstrings + symsect->sh_name);
+                                         info->index.sym) | INIT_OFFSET_MASK;
+        DEBUGP("\t%s\n", info->secstrings + symsect->sh_name);
 
-        src = (void *)hdr + symsect->sh_offset;
+        src = (void *)info->hdr + symsect->sh_offset;
         nsrc = symsect->sh_size / sizeof(*src);
-        strtab = (void *)hdr + strsect->sh_offset;
         for (ndst = i = 1; i < nsrc; ++i, ++src)
-                if (is_core_symbol(src, sechdrs, hdr->e_shnum)) {
+                if (is_core_symbol(src, info->sechdrs, info->hdr->e_shnum)) {
                         unsigned int j = src->st_name;
 
-                        while(!__test_and_set_bit(j, strmap) && strtab[j])
+                        while (!__test_and_set_bit(j, info->strmap)
+                               && info->strtab[j])
                                 ++j;
                         ++ndst;
                 }
 
         /* Append room for core symbols at end of core part. */
-        symoffs = ALIGN(mod->core_size, symsect->sh_addralign ?: 1);
-        mod->core_size = symoffs + ndst * sizeof(Elf_Sym);
+        info->symoffs = ALIGN(mod->core_size, symsect->sh_addralign ?: 1);
+        mod->core_size = info->symoffs + ndst * sizeof(Elf_Sym);
 
         /* Put string table section at end of init part of module. */
         strsect->sh_flags |= SHF_ALLOC;
         strsect->sh_entsize = get_offset(mod, &mod->init_size, strsect,
-                                         strindex) | INIT_OFFSET_MASK;
-        DEBUGP("\t%s\n", secstrings + strsect->sh_name);
+                                         info->index.str) | INIT_OFFSET_MASK;
+        DEBUGP("\t%s\n", info->secstrings + strsect->sh_name);
 
         /* Append room for core symbols' strings at end of core part. */
-        *pstroffs = mod->core_size;
-        __set_bit(0, strmap);
-        mod->core_size += bitmap_weight(strmap, strsect->sh_size);
-
-        return symoffs;
+        info->stroffs = mod->core_size;
+        __set_bit(0, info->strmap);
+        mod->core_size += bitmap_weight(info->strmap, strsect->sh_size);
 }
 
-static void add_kallsyms(struct module *mod,
-                         Elf_Shdr *sechdrs,
-                         unsigned int shnum,
-                         unsigned int symindex,
-                         unsigned int strindex,
-                         unsigned long symoffs,
-                         unsigned long stroffs,
-                         const char *secstrings,
-                         unsigned long *strmap)
+static void add_kallsyms(struct module *mod, const struct load_info *info)
 {
         unsigned int i, ndst;
         const Elf_Sym *src;
         Elf_Sym *dst;
         char *s;
+        Elf_Shdr *symsec = &info->sechdrs[info->index.sym];
 
-        mod->symtab = (void *)sechdrs[symindex].sh_addr;
-        mod->num_symtab = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
-        mod->strtab = (void *)sechdrs[strindex].sh_addr;
+        mod->symtab = (void *)symsec->sh_addr;
+        mod->num_symtab = symsec->sh_size / sizeof(Elf_Sym);
+        /* Make sure we get permanent strtab: don't use info->strtab. */
+        mod->strtab = (void *)info->sechdrs[info->index.str].sh_addr;
 
         /* Set types up while we still have access to sections. */
         for (i = 0; i < mod->num_symtab; i++)
-                mod->symtab[i].st_info
-                        = elf_type(&mod->symtab[i], sechdrs, secstrings, mod);
+                mod->symtab[i].st_info = elf_type(&mod->symtab[i], info);
 
-        mod->core_symtab = dst = mod->module_core + symoffs;
+        mod->core_symtab = dst = mod->module_core + info->symoffs;
         src = mod->symtab;
         *dst = *src;
         for (ndst = i = 1; i < mod->num_symtab; ++i, ++src) {
-                if (!is_core_symbol(src, sechdrs, shnum))
+                if (!is_core_symbol(src, info->sechdrs, info->hdr->e_shnum))
                         continue;
                 dst[ndst] = *src;
-                dst[ndst].st_name = bitmap_weight(strmap, dst[ndst].st_name);
+                dst[ndst].st_name = bitmap_weight(info->strmap,
+                                                  dst[ndst].st_name);
                 ++ndst;
         }
         mod->core_num_syms = ndst;
 
-        mod->core_strtab = s = mod->module_core + stroffs;
-        for (*s = 0, i = 1; i < sechdrs[strindex].sh_size; ++i)
-                if (test_bit(i, strmap))
+        mod->core_strtab = s = mod->module_core + info->stroffs;
+        for (*s = 0, i = 1; i < info->sechdrs[info->index.str].sh_size; ++i)
+                if (test_bit(i, info->strmap))
                         *++s = mod->strtab[i];
 }
 #else
-static inline unsigned long layout_symtab(struct module *mod,
-                                          Elf_Shdr *sechdrs,
-                                          unsigned int symindex,
-                                          unsigned int strindex,
-                                          const Elf_Ehdr *hdr,
-                                          const char *secstrings,
-                                          unsigned long *pstroffs,
-                                          unsigned long *strmap)
+static inline void layout_symtab(struct module *mod, struct load_info *info)
 {
-        return 0;
 }
 
-static inline void add_kallsyms(struct module *mod,
-                                Elf_Shdr *sechdrs,
-                                unsigned int shnum,
-                                unsigned int symindex,
-                                unsigned int strindex,
-                                unsigned long symoffs,
-                                unsigned long stroffs,
-                                const char *secstrings,
-                                const unsigned long *strmap)
+static void add_kallsyms(struct module *mod, struct load_info *info)
 {
 }
 #endif /* CONFIG_KALLSYMS */
 
 static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num)
 {
+        if (!debug)
+                return;
 #ifdef CONFIG_DYNAMIC_DEBUG
         if (ddebug_add_module(debug, num, debug->modname))
                 printk(KERN_ERR "dynamic debug error adding module: %s\n",
@@ -2087,65 +2074,47 @@ static void *module_alloc_update_bounds(unsigned long size)
 }
 
 #ifdef CONFIG_DEBUG_KMEMLEAK
-static void kmemleak_load_module(struct module *mod, Elf_Ehdr *hdr,
-                                 Elf_Shdr *sechdrs, char *secstrings)
+static void kmemleak_load_module(const struct module *mod,
+                                 const struct load_info *info)
 {
         unsigned int i;
 
         /* only scan the sections containing data */
         kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL);
 
-        for (i = 1; i < hdr->e_shnum; i++) {
-                if (!(sechdrs[i].sh_flags & SHF_ALLOC))
+        for (i = 1; i < info->hdr->e_shnum; i++) {
+                const char *name = info->secstrings + info->sechdrs[i].sh_name;
+                if (!(info->sechdrs[i].sh_flags & SHF_ALLOC))
                         continue;
-                if (strncmp(secstrings + sechdrs[i].sh_name, ".data", 5) != 0
-                    && strncmp(secstrings + sechdrs[i].sh_name, ".bss", 4) != 0)
+                if (!strstarts(name, ".data") && !strstarts(name, ".bss"))
                         continue;
 
-                kmemleak_scan_area((void *)sechdrs[i].sh_addr,
-                                   sechdrs[i].sh_size, GFP_KERNEL);
+                kmemleak_scan_area((void *)info->sechdrs[i].sh_addr,
+                                   info->sechdrs[i].sh_size, GFP_KERNEL);
         }
 }
 #else
-static inline void kmemleak_load_module(struct module *mod, Elf_Ehdr *hdr,
-                                        Elf_Shdr *sechdrs, char *secstrings)
+static inline void kmemleak_load_module(const struct module *mod,
+                                        const struct load_info *info)
 {
 }
 #endif
 
-/* Allocate and load the module: note that size of section 0 is always
-   zero, and we rely on this for optional sections. */
-static noinline struct module *load_module(void __user *umod,
-                                  unsigned long len,
-                                  const char __user *uargs)
+/* Sets info->hdr and info->len. */
+static int copy_and_check(struct load_info *info,
+                          const void __user *umod, unsigned long len,
+                          const char __user *uargs)
 {
+        int err;
         Elf_Ehdr *hdr;
-        Elf_Shdr *sechdrs;
-        char *secstrings, *args, *modmagic, *strtab = NULL;
-        char *staging;
-        unsigned int i;
-        unsigned int symindex = 0;
-        unsigned int strindex = 0;
-        unsigned int modindex, versindex, infoindex, pcpuindex;
-        struct module *mod;
-        long err = 0;
-        void *ptr = NULL; /* Stops spurious gcc warning */
-        unsigned long symoffs, stroffs, *strmap;
-        void __percpu *percpu;
-        struct _ddebug *debug = NULL;
-        unsigned int num_debug = 0;
 
-        mm_segment_t old_fs;
-
-        DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
-               umod, len, uargs);
         if (len < sizeof(*hdr))
-                return ERR_PTR(-ENOEXEC);
+                return -ENOEXEC;
 
         /* Suck in entire file: we'll want most of it. */
         /* vmalloc barfs on "unusual" numbers.  Check here */
         if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL)
-                return ERR_PTR(-ENOMEM);
+                return -ENOMEM;
 
         if (copy_from_user(hdr, umod, len) != 0) {
                 err = -EFAULT;
@@ -2153,135 +2122,225 @@ static noinline struct module *load_module(void __user *umod,
         }
 
         /* Sanity checks against insmoding binaries or wrong arch,
-           weird elf version */
+           weird elf version */
         if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0
             || hdr->e_type != ET_REL
             || !elf_check_arch(hdr)
-            || hdr->e_shentsize != sizeof(*sechdrs)) {
+            || hdr->e_shentsize != sizeof(Elf_Shdr)) {
                 err = -ENOEXEC;
                 goto free_hdr;
         }
 
-        if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr))
-                goto truncated;
+        if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr)) {
+                err = -ENOEXEC;
+                goto free_hdr;
+        }
 
-        /* Convenience variables */
-        sechdrs = (void *)hdr + hdr->e_shoff;
-        secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
-        sechdrs[0].sh_addr = 0;
+        info->hdr = hdr;
+        info->len = len;
+        return 0;
 
-        for (i = 1; i < hdr->e_shnum; i++) {
-                if (sechdrs[i].sh_type != SHT_NOBITS
-                    && len < sechdrs[i].sh_offset + sechdrs[i].sh_size)
-                        goto truncated;
+free_hdr:
+        vfree(hdr);
+        return err;
+}
+
+static void free_copy(struct load_info *info)
+{
+        vfree(info->hdr);
+}
+
+static int rewrite_section_headers(struct load_info *info)
+{
+        unsigned int i;
+
+        /* This should always be true, but let's be sure. */
+        info->sechdrs[0].sh_addr = 0;
+
+        for (i = 1; i < info->hdr->e_shnum; i++) {
+                Elf_Shdr *shdr = &info->sechdrs[i];
+                if (shdr->sh_type != SHT_NOBITS
+                    && info->len < shdr->sh_offset + shdr->sh_size) {
+                        printk(KERN_ERR "Module len %lu truncated\n",
+                               info->len);
+                        return -ENOEXEC;
+                }
 
                 /* Mark all sections sh_addr with their address in the
                    temporary image. */
-                sechdrs[i].sh_addr = (size_t)hdr + sechdrs[i].sh_offset;
+                shdr->sh_addr = (size_t)info->hdr + shdr->sh_offset;
 
-                /* Internal symbols and strings. */
-                if (sechdrs[i].sh_type == SHT_SYMTAB) {
-                        symindex = i;
-                        strindex = sechdrs[i].sh_link;
-                        strtab = (char *)hdr + sechdrs[strindex].sh_offset;
-                }
 #ifndef CONFIG_MODULE_UNLOAD
                 /* Don't load .exit sections */
-                if (strstarts(secstrings+sechdrs[i].sh_name, ".exit"))
-                        sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC;
+                if (strstarts(info->secstrings+shdr->sh_name, ".exit"))
+                        shdr->sh_flags &= ~(unsigned long)SHF_ALLOC;
 #endif
         }
 
-        modindex = find_sec(hdr, sechdrs, secstrings,
-                            ".gnu.linkonce.this_module");
-        if (!modindex) {
+        /* Track but don't keep modinfo and version sections. */
+        info->index.vers = find_sec(info, "__versions");
+        info->index.info = find_sec(info, ".modinfo");
+        info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC;
+        info->sechdrs[info->index.vers].sh_flags &= ~(unsigned long)SHF_ALLOC;
+        return 0;
+}
+
+/*
+ * Set up our basic convenience variables (pointers to section headers,
+ * search for module section index etc), and do some basic section
+ * verification.
+ *
+ * Return the temporary module pointer (we'll replace it with the final
+ * one when we move the module sections around).
+ */
+static struct module *setup_load_info(struct load_info *info)
+{
+        unsigned int i;
+        int err;
+        struct module *mod;
+
+        /* Set up the convenience variables */
+        info->sechdrs = (void *)info->hdr + info->hdr->e_shoff;
+        info->secstrings = (void *)info->hdr
+                + info->sechdrs[info->hdr->e_shstrndx].sh_offset;
+
+        err = rewrite_section_headers(info);
+        if (err)
+                return ERR_PTR(err);
+
+        /* Find internal symbols and strings. */
+        for (i = 1; i < info->hdr->e_shnum; i++) {
+                if (info->sechdrs[i].sh_type == SHT_SYMTAB) {
+                        info->index.sym = i;
+                        info->index.str = info->sechdrs[i].sh_link;
+                        info->strtab = (char *)info->hdr
+                                + info->sechdrs[info->index.str].sh_offset;
+                        break;
+                }
+        }
+
+        info->index.mod = find_sec(info, ".gnu.linkonce.this_module");
+        if (!info->index.mod) {
                 printk(KERN_WARNING "No module found in object\n");
-                err = -ENOEXEC;
-                goto free_hdr;
+                return ERR_PTR(-ENOEXEC);
         }
         /* This is temporary: point mod into copy of data. */
-        mod = (void *)sechdrs[modindex].sh_addr;
+        mod = (void *)info->sechdrs[info->index.mod].sh_addr;
 
-        if (symindex == 0) {
+        if (info->index.sym == 0) {
                 printk(KERN_WARNING "%s: module has no symbols (stripped?)\n",
                        mod->name);
-                err = -ENOEXEC;
-                goto free_hdr;
+                return ERR_PTR(-ENOEXEC);
         }
 
-        versindex = find_sec(hdr, sechdrs, secstrings, "__versions");
-        infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo");
-        pcpuindex = find_pcpusec(hdr, sechdrs, secstrings);
-
-        /* Don't keep modinfo and version sections. */
-        sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
-        sechdrs[versindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
+        info->index.pcpu = find_pcpusec(info);
 
         /* Check module struct version now, before we try to use module. */
-        if (!check_modstruct_version(sechdrs, versindex, mod)) {
-                err = -ENOEXEC;
-                goto free_hdr;
-        }
+        if (!check_modstruct_version(info->sechdrs, info->index.vers, mod))
+                return ERR_PTR(-ENOEXEC);
+
+        return mod;
+}
+
+static int check_modinfo(struct module *mod, struct load_info *info)
+{
+        const char *modmagic = get_modinfo(info, "vermagic");
+        int err;
 
-        modmagic = get_modinfo(sechdrs, infoindex, "vermagic");
         /* This is allowed: modprobe --force will invalidate it. */
         if (!modmagic) {
                 err = try_to_force_load(mod, "bad vermagic");
                 if (err)
-                        goto free_hdr;
-        } else if (!same_magic(modmagic, vermagic, versindex)) {
+                        return err;
+        } else if (!same_magic(modmagic, vermagic, info->index.vers)) {
                 printk(KERN_ERR "%s: version magic '%s' should be '%s'\n",
                        mod->name, modmagic, vermagic);
-                err = -ENOEXEC;
-                goto free_hdr;
+                return -ENOEXEC;
         }
 
-        staging = get_modinfo(sechdrs, infoindex, "staging");
-        if (staging) {
+        if (get_modinfo(info, "staging")) {
                 add_taint_module(mod, TAINT_CRAP);
                 printk(KERN_WARNING "%s: module is from the staging directory,"
                        " the quality is unknown, you have been warned.\n",
                        mod->name);
         }
 
-        /* Now copy in args */
-        args = strndup_user(uargs, ~0UL >> 1);
-        if (IS_ERR(args)) {
-                err = PTR_ERR(args);
-                goto free_hdr;
-        }
+        /* Set up license info based on the info section */
+        set_license(mod, get_modinfo(info, "license"));
 
-        strmap = kzalloc(BITS_TO_LONGS(sechdrs[strindex].sh_size)
-                         * sizeof(long), GFP_KERNEL);
-        if (!strmap) {
-                err = -ENOMEM;
-                goto free_mod;
-        }
+        return 0;
+}
 
-        mod->state = MODULE_STATE_COMING;
+static void find_module_sections(struct module *mod, struct load_info *info)
+{
+        mod->kp = section_objs(info, "__param",
+                               sizeof(*mod->kp), &mod->num_kp);
+        mod->syms = section_objs(info, "__ksymtab",
+                                 sizeof(*mod->syms), &mod->num_syms);
+        mod->crcs = section_addr(info, "__kcrctab");
+        mod->gpl_syms = section_objs(info, "__ksymtab_gpl",
+                                     sizeof(*mod->gpl_syms),
+                                     &mod->num_gpl_syms);
+        mod->gpl_crcs = section_addr(info, "__kcrctab_gpl");
+        mod->gpl_future_syms = section_objs(info,
+                                            "__ksymtab_gpl_future",
+                                            sizeof(*mod->gpl_future_syms),
+                                            &mod->num_gpl_future_syms);
+        mod->gpl_future_crcs = section_addr(info, "__kcrctab_gpl_future");
 
-        /* Allow arches to frob section contents and sizes.  */
-        err = module_frob_arch_sections(hdr, sechdrs, secstrings, mod);
-        if (err < 0)
-                goto free_mod;
+#ifdef CONFIG_UNUSED_SYMBOLS
+        mod->unused_syms = section_objs(info, "__ksymtab_unused",
+                                        sizeof(*mod->unused_syms),
+                                        &mod->num_unused_syms);
+        mod->unused_crcs = section_addr(info, "__kcrctab_unused");
+        mod->unused_gpl_syms = section_objs(info, "__ksymtab_unused_gpl",
+                                            sizeof(*mod->unused_gpl_syms),
+                                            &mod->num_unused_gpl_syms);
+        mod->unused_gpl_crcs = section_addr(info, "__kcrctab_unused_gpl");
+#endif
+#ifdef CONFIG_CONSTRUCTORS
+        mod->ctors = section_objs(info, ".ctors",
+                                  sizeof(*mod->ctors), &mod->num_ctors);
+#endif
 
-        if (pcpuindex) {
-                /* We have a special allocation for this section. */
-                err = percpu_modalloc(mod, sechdrs[pcpuindex].sh_size,
-                                      sechdrs[pcpuindex].sh_addralign);
-                if (err)
-                        goto free_mod;
-                sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
-        }
-        /* Keep this around for failure path. */
-        percpu = mod_percpu(mod);
+#ifdef CONFIG_TRACEPOINTS
+        mod->tracepoints = section_objs(info, "__tracepoints",
+                                        sizeof(*mod->tracepoints),
+                                        &mod->num_tracepoints);
+#endif
+#ifdef CONFIG_EVENT_TRACING
+        mod->trace_events = section_objs(info, "_ftrace_events",
+                                         sizeof(*mod->trace_events),
+                                         &mod->num_trace_events);
+        /*
+         * This section contains pointers to allocated objects in the trace
+         * code and not scanning it leads to false positives.
+         */
+        kmemleak_scan_area(mod->trace_events, sizeof(*mod->trace_events) *
+                           mod->num_trace_events, GFP_KERNEL);
+#endif
+#ifdef CONFIG_FTRACE_MCOUNT_RECORD
+        /* sechdrs[0].sh_size is always zero */
+        mod->ftrace_callsites = section_objs(info, "__mcount_loc",
+                                             sizeof(*mod->ftrace_callsites),
+                                             &mod->num_ftrace_callsites);
+#endif
 
-        /* Determine total sizes, and put offsets in sh_entsize.  For now
-           this is done generically; there doesn't appear to be any
-           special cases for the architectures. */
-        layout_sections(mod, hdr, sechdrs, secstrings);
-        symoffs = layout_symtab(mod, sechdrs, symindex, strindex, hdr,
-                                secstrings, &stroffs, strmap);
+        mod->extable = section_objs(info, "__ex_table",
+                                    sizeof(*mod->extable), &mod->num_exentries);
+
+        if (section_addr(info, "__obsparm"))
+                printk(KERN_WARNING "%s: Ignoring obsolete parameters\n",
+                       mod->name);
+
+        info->debug = section_objs(info, "__verbose",
+                                   sizeof(*info->debug), &info->num_debug);
+}
+
+static int move_module(struct module *mod, struct load_info *info)
+{
+        int i;
+        void *ptr;
 
         /* Do the allocs. */
         ptr = module_alloc_update_bounds(mod->core_size);
@@ -2291,10 +2350,9 @@ static noinline struct module *load_module(void __user *umod,
          * leak.
          */
         kmemleak_not_leak(ptr);
-        if (!ptr) {
-                err = -ENOMEM;
-                goto free_percpu;
-        }
+        if (!ptr)
+                return -ENOMEM;
+
         memset(ptr, 0, mod->core_size);
         mod->module_core = ptr;
 
@@ -2307,50 +2365,40 @@ static noinline struct module *load_module(void __user *umod,
          */
         kmemleak_ignore(ptr);
         if (!ptr && mod->init_size) {
-                err = -ENOMEM;
-                goto free_core;
+                module_free(mod, mod->module_core);
+                return -ENOMEM;
         }
         memset(ptr, 0, mod->init_size);
         mod->module_init = ptr;
 
         /* Transfer each section which specifies SHF_ALLOC */
         DEBUGP("final section addresses:\n");
-        for (i = 0; i < hdr->e_shnum; i++) {
+        for (i = 0; i < info->hdr->e_shnum; i++) {
                 void *dest;
+                Elf_Shdr *shdr = &info->sechdrs[i];
 
-                if (!(sechdrs[i].sh_flags & SHF_ALLOC))
+                if (!(shdr->sh_flags & SHF_ALLOC))
                         continue;
 
-                if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK)
+                if (shdr->sh_entsize & INIT_OFFSET_MASK)
                         dest = mod->module_init
-                                + (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK);
+                                + (shdr->sh_entsize & ~INIT_OFFSET_MASK);
                 else
-                        dest = mod->module_core + sechdrs[i].sh_entsize;
+                        dest = mod->module_core + shdr->sh_entsize;
 
-                if (sechdrs[i].sh_type != SHT_NOBITS)
-                        memcpy(dest, (void *)sechdrs[i].sh_addr,
-                               sechdrs[i].sh_size);
+                if (shdr->sh_type != SHT_NOBITS)
+                        memcpy(dest, (void *)shdr->sh_addr, shdr->sh_size);
                 /* Update sh_addr to point to copy in image. */
-                sechdrs[i].sh_addr = (unsigned long)dest;
-                DEBUGP("\t0x%lx %s\n", sechdrs[i].sh_addr, secstrings + sechdrs[i].sh_name);
-        }
-        /* Module has been moved. */
-        mod = (void *)sechdrs[modindex].sh_addr;
-        kmemleak_load_module(mod, hdr, sechdrs, secstrings);
-
-#if defined(CONFIG_MODULE_UNLOAD)
-        mod->refptr = alloc_percpu(struct module_ref);
-        if (!mod->refptr) {
-                err = -ENOMEM;
-                goto free_init;
+                shdr->sh_addr = (unsigned long)dest;
+                DEBUGP("\t0x%lx %s\n",
+                       shdr->sh_addr, info->secstrings + shdr->sh_name);
         }
-#endif
-        /* Now we've moved module, initialize linked lists, etc. */
-        module_unload_init(mod);
 
-        /* Set up license info based on the info section */
-        set_license(mod, get_modinfo(sechdrs, infoindex, "license"));
+        return 0;
+}
 
+static int check_module_license_and_versions(struct module *mod)
+{
         /*
          * ndiswrapper is under GPL by itself, but loads proprietary modules.
          * Don't use add_taint_module(), as it would prevent ndiswrapper from
@@ -2363,77 +2411,6 @@ static noinline struct module *load_module(void __user *umod,
         if (strcmp(mod->name, "driverloader") == 0)
                 add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
 
-        /* Set up MODINFO_ATTR fields */
-        setup_modinfo(mod, sechdrs, infoindex);
-
-        /* Fix up syms, so that st_value is a pointer to location. */
-        err = simplify_symbols(sechdrs, symindex, strtab, versindex, pcpuindex,
-                               mod);
-        if (err < 0)
-                goto cleanup;
-
-        /* Now we've got everything in the final locations, we can
-         * find optional sections. */
-        mod->kp = section_objs(hdr, sechdrs, secstrings, "__param",
-                               sizeof(*mod->kp), &mod->num_kp);
-        mod->syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab",
-                                 sizeof(*mod->syms), &mod->num_syms);
-        mod->crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab");
-        mod->gpl_syms = section_objs(hdr, sechdrs, secstrings, "__ksymtab_gpl",
-                                     sizeof(*mod->gpl_syms),
-                                     &mod->num_gpl_syms);
-        mod->gpl_crcs = section_addr(hdr, sechdrs, secstrings, "__kcrctab_gpl");
-        mod->gpl_future_syms = section_objs(hdr, sechdrs, secstrings,
-                                            "__ksymtab_gpl_future",
-                                            sizeof(*mod->gpl_future_syms),
-                                            &mod->num_gpl_future_syms);
-        mod->gpl_future_crcs = section_addr(hdr, sechdrs, secstrings,
-                                            "__kcrctab_gpl_future");
-
-#ifdef CONFIG_UNUSED_SYMBOLS
-        mod->unused_syms = section_objs(hdr, sechdrs, secstrings,
-                                        "__ksymtab_unused",
-                                        sizeof(*mod->unused_syms),
-                                        &mod->num_unused_syms);
-        mod->unused_crcs = section_addr(hdr, sechdrs, secstrings,
-                                        "__kcrctab_unused");
-        mod->unused_gpl_syms = section_objs(hdr, sechdrs, secstrings,
-                                            "__ksymtab_unused_gpl",
-                                            sizeof(*mod->unused_gpl_syms),
-                                            &mod->num_unused_gpl_syms);
-        mod->unused_gpl_crcs = section_addr(hdr, sechdrs, secstrings,
-                                            "__kcrctab_unused_gpl");
-#endif
-#ifdef CONFIG_CONSTRUCTORS
-        mod->ctors = section_objs(hdr, sechdrs, secstrings, ".ctors",
-                                  sizeof(*mod->ctors), &mod->num_ctors);
-#endif
-
-#ifdef CONFIG_TRACEPOINTS
-        mod->tracepoints = section_objs(hdr, sechdrs, secstrings,
-                                        "__tracepoints",
-                                        sizeof(*mod->tracepoints),
-                                        &mod->num_tracepoints);
-#endif
-#ifdef CONFIG_EVENT_TRACING
-        mod->trace_events = section_objs(hdr, sechdrs, secstrings,
-                                         "_ftrace_events",
-                                         sizeof(*mod->trace_events),
-                                         &mod->num_trace_events);
-        /*
-         * This section contains pointers to allocated objects in the trace
-         * code and not scanning it leads to false positives.
-         */
-        kmemleak_scan_area(mod->trace_events, sizeof(*mod->trace_events) *
-                           mod->num_trace_events, GFP_KERNEL);
-#endif
-#ifdef CONFIG_FTRACE_MCOUNT_RECORD
-        /* sechdrs[0].sh_size is always zero */
-        mod->ftrace_callsites = section_objs(hdr, sechdrs, secstrings,
-                                             "__mcount_loc",
-                                             sizeof(*mod->ftrace_callsites),
-                                             &mod->num_ftrace_callsites);
-#endif
 #ifdef CONFIG_MODVERSIONS
         if ((mod->num_syms && !mod->crcs)
             || (mod->num_gpl_syms && !mod->gpl_crcs)
@@ -2443,56 +2420,16 @@ static noinline struct module *load_module(void __user *umod,
             || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs)
 #endif
                 ) {
-                err = try_to_force_load(mod,
-                                        "no versions for exported symbols");
-                if (err)
-                        goto cleanup;
+                return try_to_force_load(mod,
+                                         "no versions for exported symbols");
         }
 #endif
+        return 0;
+}
 
-        /* Now do relocations. */
-        for (i = 1; i < hdr->e_shnum; i++) {
-                const char *strtab = (char *)sechdrs[strindex].sh_addr;
-                unsigned int info = sechdrs[i].sh_info;
-
-                /* Not a valid relocation section? */
-                if (info >= hdr->e_shnum)
-                        continue;
-
-                /* Don't bother with non-allocated sections */
-                if (!(sechdrs[info].sh_flags & SHF_ALLOC))
-                        continue;
-
-                if (sechdrs[i].sh_type == SHT_REL)
-                        err = apply_relocate(sechdrs, strtab, symindex, i,mod);
-                else if (sechdrs[i].sh_type == SHT_RELA)
-                        err = apply_relocate_add(sechdrs, strtab, symindex, i,
-                                                 mod);
-                if (err < 0)
-                        goto cleanup;
-        }
-
-        /* Set up and sort exception table */
-        mod->extable = section_objs(hdr, sechdrs, secstrings, "__ex_table",
-                                    sizeof(*mod->extable), &mod->num_exentries);
-        sort_extable(mod->extable, mod->extable + mod->num_exentries);
-
-        /* Finally, copy percpu area over. */
-        percpu_modcopy(mod, (void *)sechdrs[pcpuindex].sh_addr,
-                       sechdrs[pcpuindex].sh_size);
-
-        add_kallsyms(mod, sechdrs, hdr->e_shnum, symindex, strindex,
-                     symoffs, stroffs, secstrings, strmap);
-        kfree(strmap);
-        strmap = NULL;
-
-        if (!mod->taints)
-                debug = section_objs(hdr, sechdrs, secstrings, "__verbose",
-                                     sizeof(*debug), &num_debug);
-
-        err = module_finalize(hdr, sechdrs, mod);
-        if (err < 0)
-                goto cleanup;
+static void flush_module_icache(const struct module *mod)
+{
+        mm_segment_t old_fs;
 
         /* flush the icache in correct context */
         old_fs = get_fs();
@@ -2511,11 +2448,160 @@ static noinline struct module *load_module(void __user *umod,
                            (unsigned long)mod->module_core + mod->core_size);
 
         set_fs(old_fs);
+}
 
-        mod->args = args;
-        if (section_addr(hdr, sechdrs, secstrings, "__obsparm"))
-                printk(KERN_WARNING "%s: Ignoring obsolete parameters\n",
-                       mod->name);
+static struct module *layout_and_allocate(struct load_info *info)
+{
+        /* Module within temporary copy. */
+        struct module *mod;
+        Elf_Shdr *pcpusec;
+        int err;
+
+        mod = setup_load_info(info);
+        if (IS_ERR(mod))
+                return mod;
+
+        err = check_modinfo(mod, info);
+        if (err)
+                return ERR_PTR(err);
+
+        /* Allow arches to frob section contents and sizes.  */
+        err = module_frob_arch_sections(info->hdr, info->sechdrs,
+                                        info->secstrings, mod);
+        if (err < 0)
+                goto out;
+
+        pcpusec = &info->sechdrs[info->index.pcpu];
+        if (pcpusec->sh_size) {
+                /* We have a special allocation for this section. */
+                err = percpu_modalloc(mod,
+                                      pcpusec->sh_size, pcpusec->sh_addralign);
+                if (err)
+                        goto out;
+                pcpusec->sh_flags &= ~(unsigned long)SHF_ALLOC;
+        }
+
+        /* Determine total sizes, and put offsets in sh_entsize.  For now
+           this is done generically; there doesn't appear to be any
+           special cases for the architectures. */
+        layout_sections(mod, info);
+
+        info->strmap = kzalloc(BITS_TO_LONGS(info->sechdrs[info->index.str].sh_size)
+                         * sizeof(long), GFP_KERNEL);
+        if (!info->strmap) {
+                err = -ENOMEM;
+                goto free_percpu;
+        }
+        layout_symtab(mod, info);
+
+        /* Allocate and move to the final place */
+        err = move_module(mod, info);
+        if (err)
+                goto free_strmap;
+
+        /* Module has been copied to its final place now: return it. */
+        mod = (void *)info->sechdrs[info->index.mod].sh_addr;
+        kmemleak_load_module(mod, info);
+        return mod;
+
+free_strmap:
+        kfree(info->strmap);
+free_percpu:
+        percpu_modfree(mod);
+out:
+        return ERR_PTR(err);
+}
+
+/* mod is no longer valid after this! */
+static void module_deallocate(struct module *mod, struct load_info *info)
+{
+        kfree(info->strmap);
+        percpu_modfree(mod);
+        module_free(mod, mod->module_init);
+        module_free(mod, mod->module_core);
+}
+
+static int post_relocation(struct module *mod, const struct load_info *info)
+{
+        /* Sort exception table now relocations are done. */
+        sort_extable(mod->extable, mod->extable + mod->num_exentries);
+
+        /* Copy relocated percpu area over. */
+        percpu_modcopy(mod, (void *)info->sechdrs[info->index.pcpu].sh_addr,
+                       info->sechdrs[info->index.pcpu].sh_size);
+
+        /* Setup kallsyms-specific fields. */
+        add_kallsyms(mod, info);
+
+        /* Arch-specific module finalizing. */
+        return module_finalize(info->hdr, info->sechdrs, mod);
+}
+
+/* Allocate and load the module: note that size of section 0 is always
+   zero, and we rely on this for optional sections. */
+static struct module *load_module(void __user *umod,
+                                  unsigned long len,
+                                  const char __user *uargs)
+{
+        struct load_info info = { NULL, };
+        struct module *mod;
+        long err;
+
+        DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
+               umod, len, uargs);
+
+        /* Copy in the blobs from userspace, check they are vaguely sane. */
+        err = copy_and_check(&info, umod, len, uargs);
+        if (err)
+                return ERR_PTR(err);
+
+        /* Figure out module layout, and allocate all the memory. */
+        mod = layout_and_allocate(&info);
+        if (IS_ERR(mod)) {
+                err = PTR_ERR(mod);
+                goto free_copy;
+        }
+
+        /* Now module is in final location, initialize linked lists, etc. */
+        err = module_unload_init(mod);
+        if (err)
+                goto free_module;
+
+        /* Now we've got everything in the final locations, we can
+         * find optional sections. */
+        find_module_sections(mod, &info);
+
+        err = check_module_license_and_versions(mod);
+        if (err)
+                goto free_unload;
+
+        /* Set up MODINFO_ATTR fields */
+        setup_modinfo(mod, &info);
+
+        /* Fix up syms, so that st_value is a pointer to location. */
+        err = simplify_symbols(mod, &info);
+        if (err < 0)
+                goto free_modinfo;
+
+        err = apply_relocations(mod, &info);
+        if (err < 0)
+                goto free_modinfo;
+
+        err = post_relocation(mod, &info);
+        if (err < 0)
+                goto free_modinfo;
+
+        flush_module_icache(mod);
+
+        /* Now copy in args */
+        mod->args = strndup_user(uargs, ~0UL >> 1);
+        if (IS_ERR(mod->args)) {
+                err = PTR_ERR(mod->args);
+                goto free_arch_cleanup;
+        }
+
+        /* Mark state as coming so strong_try_module_get() ignores us. */
+        mod->state = MODULE_STATE_COMING;
 
         /* Now sew it into the lists so we can get lockdep and oops
          * info during argument parsing.  Noone should access us, since
@@ -2530,8 +2616,9 @@ static noinline struct module *load_module(void __user *umod,
                 goto unlock;
         }
 
-        if (debug)
-                dynamic_debug_setup(debug, num_debug);
+        /* This has to be done once we're sure module name is unique. */
+        if (!mod->taints)
+                dynamic_debug_setup(info.debug, info.num_debug);
 
         /* Find duplicate symbols */
         err = verify_export_symbols(mod);
@@ -2541,23 +2628,22 @@ static noinline struct module *load_module(void __user *umod,
         list_add_rcu(&mod->list, &modules);
         mutex_unlock(&module_mutex);
 
+        /* Module is ready to execute: parsing args may do that. */
         err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, NULL);
         if (err < 0)
                 goto unlink;
 
-        err = mod_sysfs_setup(mod, mod->kp, mod->num_kp);
+        /* Link in to syfs. */
+        err = mod_sysfs_setup(mod, &info, mod->kp, mod->num_kp);
         if (err < 0)
                 goto unlink;
 
-        add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
-        add_notes_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
-
-        /* Get rid of temporary copy */
-        vfree(hdr);
-
-        trace_module_load(mod);
+        /* Get rid of temporary copy and strmap. */
+        kfree(info.strmap);
+        free_copy(&info);
 
         /* Done! */
+        trace_module_load(mod);
         return mod;
 
  unlink:
@@ -2565,35 +2651,23 @@ static noinline struct module *load_module(void __user *umod,
         /* Unlink carefully: kallsyms could be walking list. */
         list_del_rcu(&mod->list);
  ddebug:
-        dynamic_debug_remove(debug);
+        if (!mod->taints)
+                dynamic_debug_remove(info.debug);
  unlock:
         mutex_unlock(&module_mutex);
         synchronize_sched();
+        kfree(mod->args);
+ free_arch_cleanup:
         module_arch_cleanup(mod);
- cleanup:
+ free_modinfo:
         free_modinfo(mod);
+ free_unload:
         module_unload_free(mod);
-#if defined(CONFIG_MODULE_UNLOAD)
-        free_percpu(mod->refptr);
- free_init:
-#endif
-        module_free(mod, mod->module_init);
- free_core:
-        module_free(mod, mod->module_core);
-        /* mod will be freed with core. Don't access it beyond this line! */
- free_percpu:
-        free_percpu(percpu);
- free_mod:
-        kfree(args);
-        kfree(strmap);
- free_hdr:
-        vfree(hdr);
+ free_module:
+        module_deallocate(mod, &info);
+ free_copy:
+        free_copy(&info);
         return ERR_PTR(err);
-
- truncated:
-        printk(KERN_ERR "Module len %lu truncated\n", len);
-        err = -ENOEXEC;
-        goto free_hdr;
 }
 
 /* Call module constructors. */
diff --git a/kernel/padata.c b/kernel/padata.c
index fdd8ae609ce3..751019415d23 100644
--- a/kernel/padata.c
+++ b/kernel/padata.c
@@ -26,18 +26,19 @@
 #include <linux/mutex.h>
 #include <linux/sched.h>
 #include <linux/slab.h>
+#include <linux/sysfs.h>
 #include <linux/rcupdate.h>
 
-#define MAX_SEQ_NR INT_MAX - NR_CPUS
+#define MAX_SEQ_NR (INT_MAX - NR_CPUS)
 #define MAX_OBJ_NUM 1000
 
 static int padata_index_to_cpu(struct parallel_data *pd, int cpu_index)
 {
         int cpu, target_cpu;
 
-        target_cpu = cpumask_first(pd->cpumask);
+        target_cpu = cpumask_first(pd->cpumask.pcpu);
         for (cpu = 0; cpu < cpu_index; cpu++)
-                target_cpu = cpumask_next(target_cpu, pd->cpumask);
+                target_cpu = cpumask_next(target_cpu, pd->cpumask.pcpu);
 
         return target_cpu;
 }
@@ -53,26 +54,27 @@ static int padata_cpu_hash(struct padata_priv *padata)
          * Hash the sequence numbers to the cpus by taking
          * seq_nr mod. number of cpus in use.
          */
-        cpu_index =  padata->seq_nr % cpumask_weight(pd->cpumask);
+        cpu_index =  padata->seq_nr % cpumask_weight(pd->cpumask.pcpu);
 
         return padata_index_to_cpu(pd, cpu_index);
 }
 
-static void padata_parallel_worker(struct work_struct *work)
+static void padata_parallel_worker(struct work_struct *parallel_work)
 {
-        struct padata_queue *queue;
+        struct padata_parallel_queue *pqueue;
         struct parallel_data *pd;
         struct padata_instance *pinst;
         LIST_HEAD(local_list);
 
         local_bh_disable();
-        queue = container_of(work, struct padata_queue, pwork);
-        pd = queue->pd;
+        pqueue = container_of(parallel_work,
+                              struct padata_parallel_queue, work);
+        pd = pqueue->pd;
         pinst = pd->pinst;
 
-        spin_lock(&queue->parallel.lock);
-        list_replace_init(&queue->parallel.list, &local_list);
-        spin_unlock(&queue->parallel.lock);
+        spin_lock(&pqueue->parallel.lock);
+        list_replace_init(&pqueue->parallel.list, &local_list);
+        spin_unlock(&pqueue->parallel.lock);
 
         while (!list_empty(&local_list)) {
                 struct padata_priv *padata;
@@ -94,7 +96,7 @@ static void padata_parallel_worker(struct work_struct *work)
  * @pinst: padata instance
  * @padata: object to be parallelized
  * @cb_cpu: cpu the serialization callback function will run on,
- *          must be in the cpumask of padata.
+ *          must be in the serial cpumask of padata(i.e. cpumask.cbcpu).
  *
  * The parallelization callback function will run with BHs off.
  * Note: Every object which is parallelized by padata_do_parallel
@@ -104,15 +106,18 @@ int padata_do_parallel(struct padata_instance *pinst,
                        struct padata_priv *padata, int cb_cpu)
 {
         int target_cpu, err;
-        struct padata_queue *queue;
+        struct padata_parallel_queue *queue;
         struct parallel_data *pd;
 
         rcu_read_lock_bh();
 
         pd = rcu_dereference(pinst->pd);
 
-        err = 0;
-        if (!(pinst->flags & PADATA_INIT))
+        err = -EINVAL;
+        if (!(pinst->flags & PADATA_INIT) || pinst->flags & PADATA_INVALID)
+                goto out;
+
+        if (!cpumask_test_cpu(cb_cpu, pd->cpumask.cbcpu))
                 goto out;
 
         err =  -EBUSY;
@@ -122,11 +127,7 @@ int padata_do_parallel(struct padata_instance *pinst,
         if (atomic_read(&pd->refcnt) >= MAX_OBJ_NUM)
                 goto out;
 
-        err = -EINVAL;
-        if (!cpumask_test_cpu(cb_cpu, pd->cpumask))
-                goto out;
-
-        err = -EINPROGRESS;
+        err = 0;
         atomic_inc(&pd->refcnt);
         padata->pd = pd;
         padata->cb_cpu = cb_cpu;
@@ -137,13 +138,13 @@ int padata_do_parallel(struct padata_instance *pinst,
         padata->seq_nr = atomic_inc_return(&pd->seq_nr);
 
         target_cpu = padata_cpu_hash(padata);
-        queue = per_cpu_ptr(pd->queue, target_cpu);
+        queue = per_cpu_ptr(pd->pqueue, target_cpu);
 
         spin_lock(&queue->parallel.lock);
         list_add_tail(&padata->list, &queue->parallel.list);
         spin_unlock(&queue->parallel.lock);
 
-        queue_work_on(target_cpu, pinst->wq, &queue->pwork);
+        queue_work_on(target_cpu, pinst->wq, &queue->work);
 
 out:
         rcu_read_unlock_bh();
@@ -171,84 +172,52 @@ EXPORT_SYMBOL(padata_do_parallel);
  */
 static struct padata_priv *padata_get_next(struct parallel_data *pd)
 {
-        int cpu, num_cpus, empty, calc_seq_nr;
-        int seq_nr, next_nr, overrun, next_overrun;
-        struct padata_queue *queue, *next_queue;
+        int cpu, num_cpus;
+        int next_nr, next_index;
+        struct padata_parallel_queue *queue, *next_queue;
         struct padata_priv *padata;
         struct padata_list *reorder;
 
-        empty = 0;
-        next_nr = -1;
-        next_overrun = 0;
-        next_queue = NULL;
-
-        num_cpus = cpumask_weight(pd->cpumask);
-
-        for_each_cpu(cpu, pd->cpumask) {
-                queue = per_cpu_ptr(pd->queue, cpu);
-                reorder = &queue->reorder;
-
-                /*
-                 * Calculate the seq_nr of the object that should be
-                 * next in this reorder queue.
-                 */
-                overrun = 0;
-                calc_seq_nr = (atomic_read(&queue->num_obj) * num_cpus)
-                               + queue->cpu_index;
+        num_cpus = cpumask_weight(pd->cpumask.pcpu);
 
-                if (unlikely(calc_seq_nr > pd->max_seq_nr)) {
-                        calc_seq_nr = calc_seq_nr - pd->max_seq_nr - 1;
-                        overrun = 1;
-                }
-
-                if (!list_empty(&reorder->list)) {
-                        padata = list_entry(reorder->list.next,
-                                            struct padata_priv, list);
-
-                        seq_nr  = padata->seq_nr;
-                        BUG_ON(calc_seq_nr != seq_nr);
-                } else {
-                        seq_nr = calc_seq_nr;
-                        empty++;
-                }
-
-                if (next_nr < 0 || seq_nr < next_nr
-                    || (next_overrun && !overrun)) {
-                        next_nr = seq_nr;
-                        next_overrun = overrun;
-                        next_queue = queue;
-                }
+        /*
+         * Calculate the percpu reorder queue and the sequence
+         * number of the next object.
+         */
+        next_nr = pd->processed;
+        next_index = next_nr % num_cpus;
+        cpu = padata_index_to_cpu(pd, next_index);
+        next_queue = per_cpu_ptr(pd->pqueue, cpu);
+
+        if (unlikely(next_nr > pd->max_seq_nr)) {
+                next_nr = next_nr - pd->max_seq_nr - 1;
+                next_index = next_nr % num_cpus;
+                cpu = padata_index_to_cpu(pd, next_index);
+                next_queue = per_cpu_ptr(pd->pqueue, cpu);
+                pd->processed = 0;
         }
 
         padata = NULL;
 
-        if (empty == num_cpus)
-                goto out;
-
         reorder = &next_queue->reorder;
 
         if (!list_empty(&reorder->list)) {
                 padata = list_entry(reorder->list.next,
                                     struct padata_priv, list);
 
-                if (unlikely(next_overrun)) {
-                        for_each_cpu(cpu, pd->cpumask) {
-                                queue = per_cpu_ptr(pd->queue, cpu);
-                                atomic_set(&queue->num_obj, 0);
-                        }
-                }
+                BUG_ON(next_nr != padata->seq_nr);
 
                 spin_lock(&reorder->lock);
                 list_del_init(&padata->list);
                 atomic_dec(&pd->reorder_objects);
                 spin_unlock(&reorder->lock);
 
-                atomic_inc(&next_queue->num_obj);
+                pd->processed++;
 
                 goto out;
         }
 
-        queue = per_cpu_ptr(pd->queue, smp_processor_id());
+        queue = per_cpu_ptr(pd->pqueue, smp_processor_id());
         if (queue->cpu_index == next_queue->cpu_index) {
                 padata = ERR_PTR(-ENODATA);
                 goto out;
@@ -262,7 +231,7 @@ out:
 static void padata_reorder(struct parallel_data *pd)
 {
         struct padata_priv *padata;
-        struct padata_queue *queue;
+        struct padata_serial_queue *squeue;
         struct padata_instance *pinst = pd->pinst;
 
         /*
@@ -301,13 +270,13 @@ static void padata_reorder(struct parallel_data *pd)
                         return;
                 }
 
-                queue = per_cpu_ptr(pd->queue, padata->cb_cpu);
+                squeue = per_cpu_ptr(pd->squeue, padata->cb_cpu);
 
-                spin_lock(&queue->serial.lock);
-                list_add_tail(&padata->list, &queue->serial.list);
-                spin_unlock(&queue->serial.lock);
+                spin_lock(&squeue->serial.lock);
+                list_add_tail(&padata->list, &squeue->serial.list);
+                spin_unlock(&squeue->serial.lock);
 
-                queue_work_on(padata->cb_cpu, pinst->wq, &queue->swork);
+                queue_work_on(padata->cb_cpu, pinst->wq, &squeue->work);
         }
 
         spin_unlock_bh(&pd->lock);
@@ -333,19 +302,19 @@ static void padata_reorder_timer(unsigned long arg)
         padata_reorder(pd);
 }
 
-static void padata_serial_worker(struct work_struct *work)
+static void padata_serial_worker(struct work_struct *serial_work)
 {
-        struct padata_queue *queue;
+        struct padata_serial_queue *squeue;
         struct parallel_data *pd;
         LIST_HEAD(local_list);
 
         local_bh_disable();
-        queue = container_of(work, struct padata_queue, swork);
-        pd = queue->pd;
+        squeue = container_of(serial_work, struct padata_serial_queue, work);
+        pd = squeue->pd;
 
-        spin_lock(&queue->serial.lock);
-        list_replace_init(&queue->serial.list, &local_list);
-        spin_unlock(&queue->serial.lock);
+        spin_lock(&squeue->serial.lock);
+        list_replace_init(&squeue->serial.list, &local_list);
+        spin_unlock(&squeue->serial.lock);
 
         while (!list_empty(&local_list)) {
                 struct padata_priv *padata;
@@ -372,18 +341,18 @@ static void padata_serial_worker(struct work_struct *work)
 void padata_do_serial(struct padata_priv *padata)
 {
         int cpu;
-        struct padata_queue *queue;
+        struct padata_parallel_queue *pqueue;
         struct parallel_data *pd;
 
         pd = padata->pd;
 
         cpu = get_cpu();
-        queue = per_cpu_ptr(pd->queue, cpu);
+        pqueue = per_cpu_ptr(pd->pqueue, cpu);
 
-        spin_lock(&queue->reorder.lock);
+        spin_lock(&pqueue->reorder.lock);
         atomic_inc(&pd->reorder_objects);
-        list_add_tail(&padata->list, &queue->reorder.list);
-        spin_unlock(&queue->reorder.lock);
+        list_add_tail(&padata->list, &pqueue->reorder.list);
+        spin_unlock(&pqueue->reorder.lock);
 
         put_cpu();
 
@@ -391,52 +360,89 @@ void padata_do_serial(struct padata_priv *padata)
 }
 EXPORT_SYMBOL(padata_do_serial);
 
-/* Allocate and initialize the internal cpumask dependend resources. */
-static struct parallel_data *padata_alloc_pd(struct padata_instance *pinst,
-                                             const struct cpumask *cpumask)
+static int padata_setup_cpumasks(struct parallel_data *pd,
+                                 const struct cpumask *pcpumask,
+                                 const struct cpumask *cbcpumask)
 {
-        int cpu, cpu_index, num_cpus;
-        struct padata_queue *queue;
-        struct parallel_data *pd;
-
-        cpu_index = 0;
+        if (!alloc_cpumask_var(&pd->cpumask.pcpu, GFP_KERNEL))
+                return -ENOMEM;
 
-        pd = kzalloc(sizeof(struct parallel_data), GFP_KERNEL);
-        if (!pd)
-                goto err;
+        cpumask_and(pd->cpumask.pcpu, pcpumask, cpu_active_mask);
+        if (!alloc_cpumask_var(&pd->cpumask.cbcpu, GFP_KERNEL)) {
+                free_cpumask_var(pd->cpumask.cbcpu);
+                return -ENOMEM;
+        }
 
-        pd->queue = alloc_percpu(struct padata_queue);
-        if (!pd->queue)
-                goto err_free_pd;
+        cpumask_and(pd->cpumask.cbcpu, cbcpumask, cpu_active_mask);
+        return 0;
+}
 
-        if (!alloc_cpumask_var(&pd->cpumask, GFP_KERNEL))
-                goto err_free_queue;
+static void __padata_list_init(struct padata_list *pd_list)
+{
+        INIT_LIST_HEAD(&pd_list->list);
+        spin_lock_init(&pd_list->lock);
+}
 
-        cpumask_and(pd->cpumask, cpumask, cpu_active_mask);
+/* Initialize all percpu queues used by serial workers */
+static void padata_init_squeues(struct parallel_data *pd)
+{
+        int cpu;
+        struct padata_serial_queue *squeue;
 
-        for_each_cpu(cpu, pd->cpumask) {
-                queue = per_cpu_ptr(pd->queue, cpu);
+        for_each_cpu(cpu, pd->cpumask.cbcpu) {
+                squeue = per_cpu_ptr(pd->squeue, cpu);
+                squeue->pd = pd;
+                __padata_list_init(&squeue->serial);
+                INIT_WORK(&squeue->work, padata_serial_worker);
+        }
+}
 
-                queue->pd = pd;
+/* Initialize all percpu queues used by parallel workers */
+static void padata_init_pqueues(struct parallel_data *pd)
+{
+        int cpu_index, num_cpus, cpu;
+        struct padata_parallel_queue *pqueue;
 
-                queue->cpu_index = cpu_index;
+        cpu_index = 0;
+        for_each_cpu(cpu, pd->cpumask.pcpu) {
+                pqueue = per_cpu_ptr(pd->pqueue, cpu);
+                pqueue->pd = pd;
+                pqueue->cpu_index = cpu_index;
                 cpu_index++;
 
-                INIT_LIST_HEAD(&queue->reorder.list);
-                INIT_LIST_HEAD(&queue->parallel.list);
-                INIT_LIST_HEAD(&queue->serial.list);
-                spin_lock_init(&queue->reorder.lock);
-                spin_lock_init(&queue->parallel.lock);
-                spin_lock_init(&queue->serial.lock);
-
-                INIT_WORK(&queue->pwork, padata_parallel_worker);
-                INIT_WORK(&queue->swork, padata_serial_worker);
-                atomic_set(&queue->num_obj, 0);
+                __padata_list_init(&pqueue->reorder);
+                __padata_list_init(&pqueue->parallel);
+                INIT_WORK(&pqueue->work, padata_parallel_worker);
+                atomic_set(&pqueue->num_obj, 0);
         }
 
-        num_cpus = cpumask_weight(pd->cpumask);
-        pd->max_seq_nr = (MAX_SEQ_NR / num_cpus) * num_cpus - 1;
+        num_cpus = cpumask_weight(pd->cpumask.pcpu);
+        pd->max_seq_nr = num_cpus ? (MAX_SEQ_NR / num_cpus) * num_cpus - 1 : 0;
+}
+
+/* Allocate and initialize the internal cpumask dependend resources. */
+static struct parallel_data *padata_alloc_pd(struct padata_instance *pinst,
+                                             const struct cpumask *pcpumask,
+                                             const struct cpumask *cbcpumask)
+{
+        struct parallel_data *pd;
 
+        pd = kzalloc(sizeof(struct parallel_data), GFP_KERNEL);
+        if (!pd)
+                goto err;
+
+        pd->pqueue = alloc_percpu(struct padata_parallel_queue);
+        if (!pd->pqueue)
+                goto err_free_pd;
+
+        pd->squeue = alloc_percpu(struct padata_serial_queue);
+        if (!pd->squeue)
+                goto err_free_pqueue;
+        if (padata_setup_cpumasks(pd, pcpumask, cbcpumask) < 0)
+                goto err_free_squeue;
+
+        padata_init_pqueues(pd);
+        padata_init_squeues(pd);
         setup_timer(&pd->timer, padata_reorder_timer, (unsigned long)pd);
         atomic_set(&pd->seq_nr, -1);
         atomic_set(&pd->reorder_objects, 0);
@@ -446,8 +452,10 @@ static struct parallel_data *padata_alloc_pd(struct padata_instance *pinst,
 
         return pd;
 
-err_free_queue:
-        free_percpu(pd->queue);
+err_free_squeue:
+        free_percpu(pd->squeue);
+err_free_pqueue:
+        free_percpu(pd->pqueue);
 err_free_pd:
         kfree(pd);
 err:
@@ -456,8 +464,10 @@ err:
 
 static void padata_free_pd(struct parallel_data *pd)
 {
-        free_cpumask_var(pd->cpumask);
-        free_percpu(pd->queue);
+        free_cpumask_var(pd->cpumask.pcpu);
+        free_cpumask_var(pd->cpumask.cbcpu);
+        free_percpu(pd->pqueue);
+        free_percpu(pd->squeue);
         kfree(pd);
 }
 
@@ -465,11 +475,12 @@ static void padata_free_pd(struct parallel_data *pd)
 static void padata_flush_queues(struct parallel_data *pd)
 {
         int cpu;
-        struct padata_queue *queue;
+        struct padata_parallel_queue *pqueue;
+        struct padata_serial_queue *squeue;
 
-        for_each_cpu(cpu, pd->cpumask) {
-                queue = per_cpu_ptr(pd->queue, cpu);
-                flush_work(&queue->pwork);
+        for_each_cpu(cpu, pd->cpumask.pcpu) {
+                pqueue = per_cpu_ptr(pd->pqueue, cpu);
+                flush_work(&pqueue->work);
         }
 
         del_timer_sync(&pd->timer);
@@ -477,19 +488,39 @@ static void padata_flush_queues(struct parallel_data *pd)
         if (atomic_read(&pd->reorder_objects))
                 padata_reorder(pd);
 
-        for_each_cpu(cpu, pd->cpumask) {
-                queue = per_cpu_ptr(pd->queue, cpu);
-                flush_work(&queue->swork);
+        for_each_cpu(cpu, pd->cpumask.cbcpu) {
+                squeue = per_cpu_ptr(pd->squeue, cpu);
+                flush_work(&squeue->work);
         }
 
         BUG_ON(atomic_read(&pd->refcnt) != 0);
 }
 
+static void __padata_start(struct padata_instance *pinst)
+{
+        pinst->flags |= PADATA_INIT;
+}
+
+static void __padata_stop(struct padata_instance *pinst)
+{
+        if (!(pinst->flags & PADATA_INIT))
+                return;
+
+        pinst->flags &= ~PADATA_INIT;
+
+        synchronize_rcu();
+
+        get_online_cpus();
+        padata_flush_queues(pinst->pd);
+        put_online_cpus();
+}
+
 /* Replace the internal control stucture with a new one. */
 static void padata_replace(struct padata_instance *pinst,
                            struct parallel_data *pd_new)
 {
         struct parallel_data *pd_old = pinst->pd;
+        int notification_mask = 0;
 
         pinst->flags |= PADATA_RESET;
 
@@ -497,41 +528,162 @@ static void padata_replace(struct padata_instance *pinst,
 
         synchronize_rcu();
 
+        if (!cpumask_equal(pd_old->cpumask.pcpu, pd_new->cpumask.pcpu))
+                notification_mask |= PADATA_CPU_PARALLEL;
+        if (!cpumask_equal(pd_old->cpumask.cbcpu, pd_new->cpumask.cbcpu))
+                notification_mask |= PADATA_CPU_SERIAL;
+
         padata_flush_queues(pd_old);
         padata_free_pd(pd_old);
 
+        if (notification_mask)
+                blocking_notifier_call_chain(&pinst->cpumask_change_notifier,
+                                             notification_mask,
+                                             &pd_new->cpumask);
+
         pinst->flags &= ~PADATA_RESET;
 }
 
 /**
- * padata_set_cpumask - set the cpumask that padata should use
+ * padata_register_cpumask_notifier - Registers a notifier that will be called
+ *                             if either pcpu or cbcpu or both cpumasks change.
  *
- * @pinst: padata instance
- * @cpumask: the cpumask to use
+ * @pinst: A poineter to padata instance
+ * @nblock: A pointer to notifier block.
  */
-int padata_set_cpumask(struct padata_instance *pinst,
-                        cpumask_var_t cpumask)
+int padata_register_cpumask_notifier(struct padata_instance *pinst,
+                                     struct notifier_block *nblock)
 {
+        return blocking_notifier_chain_register(&pinst->cpumask_change_notifier,
+                                                nblock);
+}
+EXPORT_SYMBOL(padata_register_cpumask_notifier);
+
+/**
+ * padata_unregister_cpumask_notifier - Unregisters cpumask notifier
+ *        registered earlier  using padata_register_cpumask_notifier
+ *
+ * @pinst: A pointer to data instance.
+ * @nlock: A pointer to notifier block.
+ */
+int padata_unregister_cpumask_notifier(struct padata_instance *pinst,
+                                       struct notifier_block *nblock)
+{
+        return blocking_notifier_chain_unregister(
+                &pinst->cpumask_change_notifier,
+                nblock);
+}
+EXPORT_SYMBOL(padata_unregister_cpumask_notifier);
+
+
+/* If cpumask contains no active cpu, we mark the instance as invalid. */
+static bool padata_validate_cpumask(struct padata_instance *pinst,
+                                    const struct cpumask *cpumask)
+{
+        if (!cpumask_intersects(cpumask, cpu_active_mask)) {
+                pinst->flags |= PADATA_INVALID;
+                return false;
+        }
+
+        pinst->flags &= ~PADATA_INVALID;
+        return true;
+}
+
+static int __padata_set_cpumasks(struct padata_instance *pinst,
+                                 cpumask_var_t pcpumask,
+                                 cpumask_var_t cbcpumask)
+{
+        int valid;
         struct parallel_data *pd;
-        int err = 0;
+
+        valid = padata_validate_cpumask(pinst, pcpumask);
+        if (!valid) {
+                __padata_stop(pinst);
+                goto out_replace;
+        }
+
+        valid = padata_validate_cpumask(pinst, cbcpumask);
+        if (!valid)
+                __padata_stop(pinst);
+
+out_replace:
+        pd = padata_alloc_pd(pinst, pcpumask, cbcpumask);
+        if (!pd)
+                return -ENOMEM;
+
+        cpumask_copy(pinst->cpumask.pcpu, pcpumask);
+        cpumask_copy(pinst->cpumask.cbcpu, cbcpumask);
+
+        padata_replace(pinst, pd);
+
+        if (valid)
+                __padata_start(pinst);
+
+        return 0;
+}
+
+/**
+ * padata_set_cpumasks - Set both parallel and serial cpumasks. The first
+ *                       one is used by parallel workers and the second one
+ *                       by the wokers doing serialization.
+ *
+ * @pinst: padata instance
+ * @pcpumask: the cpumask to use for parallel workers
+ * @cbcpumask: the cpumsak to use for serial workers
+ */
+int padata_set_cpumasks(struct padata_instance *pinst, cpumask_var_t pcpumask,
+                        cpumask_var_t cbcpumask)
+{
+        int err;
 
         mutex_lock(&pinst->lock);
+        get_online_cpus();
 
+        err = __padata_set_cpumasks(pinst, pcpumask, cbcpumask);
+
+        put_online_cpus();
+        mutex_unlock(&pinst->lock);
+
+        return err;
+
+}
+EXPORT_SYMBOL(padata_set_cpumasks);
+
+/**
+ * padata_set_cpumask: Sets specified by @cpumask_type cpumask to the value
+ *                     equivalent to @cpumask.
+ *
+ * @pinst: padata instance
+ * @cpumask_type: PADATA_CPU_SERIAL or PADATA_CPU_PARALLEL corresponding
+ *                to parallel and serial cpumasks respectively.
+ * @cpumask: the cpumask to use
+ */
+int padata_set_cpumask(struct padata_instance *pinst, int cpumask_type,
+                       cpumask_var_t cpumask)
+{
+        struct cpumask *serial_mask, *parallel_mask;
+        int err = -EINVAL;
+
+        mutex_lock(&pinst->lock);
         get_online_cpus();
 
-        pd = padata_alloc_pd(pinst, cpumask);
-        if (!pd) {
-                err = -ENOMEM;
-                goto out;
+        switch (cpumask_type) {
+        case PADATA_CPU_PARALLEL:
+                serial_mask = pinst->cpumask.cbcpu;
+                parallel_mask = cpumask;
+                break;
+        case PADATA_CPU_SERIAL:
+                parallel_mask = pinst->cpumask.pcpu;
+                serial_mask = cpumask;
+                break;
+        default:
+                 goto out;
         }
 
-        cpumask_copy(pinst->cpumask, cpumask);
-
-        padata_replace(pinst, pd);
+        err =  __padata_set_cpumasks(pinst, parallel_mask, serial_mask);
 
 out:
         put_online_cpus();
-
         mutex_unlock(&pinst->lock);
 
         return err;
@@ -543,30 +695,48 @@ static int __padata_add_cpu(struct padata_instance *pinst, int cpu)
         struct parallel_data *pd;
 
         if (cpumask_test_cpu(cpu, cpu_active_mask)) {
-                pd = padata_alloc_pd(pinst, pinst->cpumask);
+                pd = padata_alloc_pd(pinst, pinst->cpumask.pcpu,
+                                     pinst->cpumask.cbcpu);
                 if (!pd)
                         return -ENOMEM;
 
                 padata_replace(pinst, pd);
+
+                if (padata_validate_cpumask(pinst, pinst->cpumask.pcpu) &&
+                    padata_validate_cpumask(pinst, pinst->cpumask.cbcpu))
+                        __padata_start(pinst);
         }
 
         return 0;
 }
 
-/**
- * padata_add_cpu - add a cpu to the padata cpumask
+ /**
+ * padata_add_cpu - add a cpu to one or both(parallel and serial)
+ *                  padata cpumasks.
  *
  * @pinst: padata instance
  * @cpu: cpu to add
+ * @mask: bitmask of flags specifying to which cpumask @cpu shuld be added.
+ *        The @mask may be any combination of the following flags:
+ *          PADATA_CPU_SERIAL   - serial cpumask
+ *          PADATA_CPU_PARALLEL - parallel cpumask
  */
-int padata_add_cpu(struct padata_instance *pinst, int cpu)
+
+int padata_add_cpu(struct padata_instance *pinst, int cpu, int mask)
 {
         int err;
 
+        if (!(mask & (PADATA_CPU_SERIAL | PADATA_CPU_PARALLEL)))
+                return -EINVAL;
+
         mutex_lock(&pinst->lock);
 
         get_online_cpus();
-        cpumask_set_cpu(cpu, pinst->cpumask);
+        if (mask & PADATA_CPU_SERIAL)
+                cpumask_set_cpu(cpu, pinst->cpumask.cbcpu);
+        if (mask & PADATA_CPU_PARALLEL)
+                cpumask_set_cpu(cpu, pinst->cpumask.pcpu);
+
         err = __padata_add_cpu(pinst, cpu);
         put_online_cpus();
 
@@ -578,10 +748,16 @@ EXPORT_SYMBOL(padata_add_cpu);
 
 static int __padata_remove_cpu(struct padata_instance *pinst, int cpu)
 {
-        struct parallel_data *pd;
+        struct parallel_data *pd = NULL;
 
         if (cpumask_test_cpu(cpu, cpu_online_mask)) {
-                pd = padata_alloc_pd(pinst, pinst->cpumask);
+
+                if (!padata_validate_cpumask(pinst, pinst->cpumask.pcpu) ||
+                    !padata_validate_cpumask(pinst, pinst->cpumask.cbcpu))
+                        __padata_stop(pinst);
+
+                pd = padata_alloc_pd(pinst, pinst->cpumask.pcpu,
+                                     pinst->cpumask.cbcpu);
                 if (!pd)
                         return -ENOMEM;
 
@@ -591,20 +767,32 @@ static int __padata_remove_cpu(struct padata_instance *pinst, int cpu)
         return 0;
 }
 
-/**
- * padata_remove_cpu - remove a cpu from the padata cpumask
+ /**
+ * padata_remove_cpu - remove a cpu from the one or both(serial and paralell)
+ *                     padata cpumasks.
  *
  * @pinst: padata instance
  * @cpu: cpu to remove
+ * @mask: bitmask specifying from which cpumask @cpu should be removed
+ *        The @mask may be any combination of the following flags:
+ *          PADATA_CPU_SERIAL   - serial cpumask
+ *          PADATA_CPU_PARALLEL - parallel cpumask
  */
-int padata_remove_cpu(struct padata_instance *pinst, int cpu)
+int padata_remove_cpu(struct padata_instance *pinst, int cpu, int mask)
 {
         int err;
 
+        if (!(mask & (PADATA_CPU_SERIAL | PADATA_CPU_PARALLEL)))
+                return -EINVAL;
+
         mutex_lock(&pinst->lock);
 
         get_online_cpus();
-        cpumask_clear_cpu(cpu, pinst->cpumask);
+        if (mask & PADATA_CPU_SERIAL)
+                cpumask_clear_cpu(cpu, pinst->cpumask.cbcpu);
+        if (mask & PADATA_CPU_PARALLEL)
+                cpumask_clear_cpu(cpu, pinst->cpumask.pcpu);
+
         err = __padata_remove_cpu(pinst, cpu);
         put_online_cpus();
 
@@ -619,11 +807,20 @@ EXPORT_SYMBOL(padata_remove_cpu);
  *
  * @pinst: padata instance to start
  */
-void padata_start(struct padata_instance *pinst)
+int padata_start(struct padata_instance *pinst)
 {
+        int err = 0;
+
         mutex_lock(&pinst->lock);
-        pinst->flags |= PADATA_INIT;
+
+        if (pinst->flags & PADATA_INVALID)
+                err =-EINVAL;
+
+         __padata_start(pinst);
+
         mutex_unlock(&pinst->lock);
+
+        return err;
 }
 EXPORT_SYMBOL(padata_start);
 
@@ -635,12 +832,20 @@ EXPORT_SYMBOL(padata_start);
 void padata_stop(struct padata_instance *pinst)
 {
         mutex_lock(&pinst->lock);
-        pinst->flags &= ~PADATA_INIT;
+        __padata_stop(pinst);
         mutex_unlock(&pinst->lock);
 }
 EXPORT_SYMBOL(padata_stop);
 
 #ifdef CONFIG_HOTPLUG_CPU
+
+static inline int pinst_has_cpu(struct padata_instance *pinst, int cpu)
+{
+        return cpumask_test_cpu(cpu, pinst->cpumask.pcpu) ||
+                cpumask_test_cpu(cpu, pinst->cpumask.cbcpu);
+}
+
+
 static int padata_cpu_callback(struct notifier_block *nfb,
                                unsigned long action, void *hcpu)
 {
@@ -653,7 +858,7 @@ static int padata_cpu_callback(struct notifier_block *nfb,
         switch (action) {
         case CPU_ONLINE:
         case CPU_ONLINE_FROZEN:
-                if (!cpumask_test_cpu(cpu, pinst->cpumask))
+                if (!pinst_has_cpu(pinst, cpu))
                         break;
                 mutex_lock(&pinst->lock);
                 err = __padata_add_cpu(pinst, cpu);
@@ -664,7 +869,7 @@ static int padata_cpu_callback(struct notifier_block *nfb,
 
         case CPU_DOWN_PREPARE:
         case CPU_DOWN_PREPARE_FROZEN:
-                if (!cpumask_test_cpu(cpu, pinst->cpumask))
+                if (!pinst_has_cpu(pinst, cpu))
                         break;
                 mutex_lock(&pinst->lock);
                 err = __padata_remove_cpu(pinst, cpu);
@@ -675,7 +880,7 @@ static int padata_cpu_callback(struct notifier_block *nfb,
 
         case CPU_UP_CANCELED:
         case CPU_UP_CANCELED_FROZEN:
-                if (!cpumask_test_cpu(cpu, pinst->cpumask))
+                if (!pinst_has_cpu(pinst, cpu))
                         break;
                 mutex_lock(&pinst->lock);
                 __padata_remove_cpu(pinst, cpu);
@@ -683,7 +888,7 @@ static int padata_cpu_callback(struct notifier_block *nfb,
 
         case CPU_DOWN_FAILED:
         case CPU_DOWN_FAILED_FROZEN:
-                if (!cpumask_test_cpu(cpu, pinst->cpumask))
+                if (!pinst_has_cpu(pinst, cpu))
                         break;
                 mutex_lock(&pinst->lock);
                 __padata_add_cpu(pinst, cpu);
@@ -694,36 +899,202 @@ static int padata_cpu_callback(struct notifier_block *nfb,
 }
 #endif
 
+static void __padata_free(struct padata_instance *pinst)
+{
+#ifdef CONFIG_HOTPLUG_CPU
+        unregister_hotcpu_notifier(&pinst->cpu_notifier);
+#endif
+
+        padata_stop(pinst);
+        padata_free_pd(pinst->pd);
+        free_cpumask_var(pinst->cpumask.pcpu);
+        free_cpumask_var(pinst->cpumask.cbcpu);
+        kfree(pinst);
+}
+
+#define kobj2pinst(_kobj)                                       \
+        container_of(_kobj, struct padata_instance, kobj)
+#define attr2pentry(_attr)                                      \
+        container_of(_attr, struct padata_sysfs_entry, attr)
+
+static void padata_sysfs_release(struct kobject *kobj)
+{
+        struct padata_instance *pinst = kobj2pinst(kobj);
+        __padata_free(pinst);
+}
+
+struct padata_sysfs_entry {
+        struct attribute attr;
+        ssize_t (*show)(struct padata_instance *, struct attribute *, char *);
+        ssize_t (*store)(struct padata_instance *, struct attribute *,
+                         const char *, size_t);
+};
+
+static ssize_t show_cpumask(struct padata_instance *pinst,
+                            struct attribute *attr,  char *buf)
+{
+        struct cpumask *cpumask;
+        ssize_t len;
+
+        mutex_lock(&pinst->lock);
+        if (!strcmp(attr->name, "serial_cpumask"))
+                cpumask = pinst->cpumask.cbcpu;
+        else
+                cpumask = pinst->cpumask.pcpu;
+
+        len = bitmap_scnprintf(buf, PAGE_SIZE, cpumask_bits(cpumask),
+                               nr_cpu_ids);
+        if (PAGE_SIZE - len < 2)
+                len = -EINVAL;
+        else
+                len += sprintf(buf + len, "\n");
+
+        mutex_unlock(&pinst->lock);
+        return len;
+}
+
+static ssize_t store_cpumask(struct padata_instance *pinst,
+                             struct attribute *attr,
+                             const char *buf, size_t count)
+{
+        cpumask_var_t new_cpumask;
+        ssize_t ret;
+        int mask_type;
+
+        if (!alloc_cpumask_var(&new_cpumask, GFP_KERNEL))
+                return -ENOMEM;
+
+        ret = bitmap_parse(buf, count, cpumask_bits(new_cpumask),
+                           nr_cpumask_bits);
+        if (ret < 0)
+                goto out;
+
+        mask_type = !strcmp(attr->name, "serial_cpumask") ?
+                PADATA_CPU_SERIAL : PADATA_CPU_PARALLEL;
+        ret = padata_set_cpumask(pinst, mask_type, new_cpumask);
+        if (!ret)
+                ret = count;
+
+out:
+        free_cpumask_var(new_cpumask);
+        return ret;
+}
+
+#define PADATA_ATTR_RW(_name, _show_name, _store_name)          \
+        static struct padata_sysfs_entry _name##_attr =         \
+                __ATTR(_name, 0644, _show_name, _store_name)
+#define PADATA_ATTR_RO(_name, _show_name)               \
+        static struct padata_sysfs_entry _name##_attr = \
+                __ATTR(_name, 0400, _show_name, NULL)
+
+PADATA_ATTR_RW(serial_cpumask, show_cpumask, store_cpumask);
+PADATA_ATTR_RW(parallel_cpumask, show_cpumask, store_cpumask);
+
+/*
+ * Padata sysfs provides the following objects:
+ * serial_cpumask   [RW] - cpumask for serial workers
+ * parallel_cpumask [RW] - cpumask for parallel workers
+ */
+static struct attribute *padata_default_attrs[] = {
+        &serial_cpumask_attr.attr,
+        &parallel_cpumask_attr.attr,
+        NULL,
+};
+
+static ssize_t padata_sysfs_show(struct kobject *kobj,
+                                 struct attribute *attr, char *buf)
+{
+        struct padata_instance *pinst;
+        struct padata_sysfs_entry *pentry;
+        ssize_t ret = -EIO;
+
+        pinst = kobj2pinst(kobj);
+        pentry = attr2pentry(attr);
+        if (pentry->show)
+                ret = pentry->show(pinst, attr, buf);
+
+        return ret;
+}
+
+static ssize_t padata_sysfs_store(struct kobject *kobj, struct attribute *attr,
+                                  const char *buf, size_t count)
+{
+        struct padata_instance *pinst;
+        struct padata_sysfs_entry *pentry;
+        ssize_t ret = -EIO;
+
+        pinst = kobj2pinst(kobj);
+        pentry = attr2pentry(attr);
+        if (pentry->show)
+                ret = pentry->store(pinst, attr, buf, count);
+
+        return ret;
+}
+
+static const struct sysfs_ops padata_sysfs_ops = {
+        .show = padata_sysfs_show,
+        .store = padata_sysfs_store,
+};
+
+static struct kobj_type padata_attr_type = {
+        .sysfs_ops = &padata_sysfs_ops,
+        .default_attrs = padata_default_attrs,
+        .release = padata_sysfs_release,
+};
+
 /**
- * padata_alloc - allocate and initialize a padata instance
+ * padata_alloc_possible - Allocate and initialize padata instance.
+ *                         Use the cpu_possible_mask for serial and
+ *                         parallel workers.
  *
- * @cpumask: cpumask that padata uses for parallelization
  * @wq: workqueue to use for the allocated padata instance
  */
-struct padata_instance *padata_alloc(const struct cpumask *cpumask,
-                                     struct workqueue_struct *wq)
+struct padata_instance *padata_alloc_possible(struct workqueue_struct *wq)
+{
+        return padata_alloc(wq, cpu_possible_mask, cpu_possible_mask);
+}
+EXPORT_SYMBOL(padata_alloc_possible);
+
+/**
+ * padata_alloc - allocate and initialize a padata instance and specify
+ *                cpumasks for serial and parallel workers.
+ *
+ * @wq: workqueue to use for the allocated padata instance
+ * @pcpumask: cpumask that will be used for padata parallelization
+ * @cbcpumask: cpumask that will be used for padata serialization
+ */
+struct padata_instance *padata_alloc(struct workqueue_struct *wq,
+                                     const struct cpumask *pcpumask,
+                                     const struct cpumask *cbcpumask)
 {
         struct padata_instance *pinst;
-        struct parallel_data *pd;
+        struct parallel_data *pd = NULL;
 
         pinst = kzalloc(sizeof(struct padata_instance), GFP_KERNEL);
         if (!pinst)
                 goto err;
 
         get_online_cpus();
-
-        pd = padata_alloc_pd(pinst, cpumask);
-        if (!pd)
+        if (!alloc_cpumask_var(&pinst->cpumask.pcpu, GFP_KERNEL))
                 goto err_free_inst;
+        if (!alloc_cpumask_var(&pinst->cpumask.cbcpu, GFP_KERNEL)) {
+                free_cpumask_var(pinst->cpumask.pcpu);
+                goto err_free_inst;
+        }
+        if (!padata_validate_cpumask(pinst, pcpumask) ||
+            !padata_validate_cpumask(pinst, cbcpumask))
+                goto err_free_masks;
 
-        if (!alloc_cpumask_var(&pinst->cpumask, GFP_KERNEL))
-                goto err_free_pd;
+        pd = padata_alloc_pd(pinst, pcpumask, cbcpumask);
+        if (!pd)
+                goto err_free_masks;
 
         rcu_assign_pointer(pinst->pd, pd);
 
         pinst->wq = wq;
 
-        cpumask_copy(pinst->cpumask, cpumask);
+        cpumask_copy(pinst->cpumask.pcpu, pcpumask);
+        cpumask_copy(pinst->cpumask.cbcpu, cbcpumask);
 
         pinst->flags = 0;
 
@@ -735,12 +1106,15 @@ struct padata_instance *padata_alloc(const struct cpumask *cpumask,
 
         put_online_cpus();
 
+        BLOCKING_INIT_NOTIFIER_HEAD(&pinst->cpumask_change_notifier);
+        kobject_init(&pinst->kobj, &padata_attr_type);
         mutex_init(&pinst->lock);
 
         return pinst;
 
-err_free_pd:
-        padata_free_pd(pd);
+err_free_masks:
+        free_cpumask_var(pinst->cpumask.pcpu);
+        free_cpumask_var(pinst->cpumask.cbcpu);
 err_free_inst:
         kfree(pinst);
         put_online_cpus();
@@ -756,19 +1130,6 @@ EXPORT_SYMBOL(padata_alloc);
  */
 void padata_free(struct padata_instance *pinst)
 {
-        padata_stop(pinst);
-
-        synchronize_rcu();
-
-#ifdef CONFIG_HOTPLUG_CPU
-        unregister_hotcpu_notifier(&pinst->cpu_notifier);
-#endif
-        get_online_cpus();
-        padata_flush_queues(pinst->pd);
-        put_online_cpus();
-
-        padata_free_pd(pinst->pd);
-        free_cpumask_var(pinst->cpumask);
-        kfree(pinst);
+        kobject_put(&pinst->kobj);
 }
 EXPORT_SYMBOL(padata_free);
diff --git a/kernel/panic.c b/kernel/panic.c
index 3b16cd93fa7d..4c13b1a88ebb 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -24,6 +24,9 @@
 #include <linux/nmi.h>
 #include <linux/dmi.h>
 
+#define PANIC_TIMER_STEP 100
+#define PANIC_BLINK_SPD 18
+
 int panic_on_oops;
 static unsigned long tainted_mask;
 static int pause_on_oops;
@@ -36,36 +39,15 @@ ATOMIC_NOTIFIER_HEAD(panic_notifier_list);
 
 EXPORT_SYMBOL(panic_notifier_list);
 
-/* Returns how long it waited in ms */
-long (*panic_blink)(long time);
-EXPORT_SYMBOL(panic_blink);
-
-static void panic_blink_one_second(void)
+static long no_blink(int state)
 {
-        static long i = 0, end;
-
-        if (panic_blink) {
-                end = i + MSEC_PER_SEC;
-
-                while (i < end) {
-                        i += panic_blink(i);
-                        mdelay(1);
-                        i++;
-                }
-        } else {
-                /*
-                 * When running under a hypervisor a small mdelay may get
-                 * rounded up to the hypervisor timeslice. For example, with
-                 * a 1ms in 10ms hypervisor timeslice we might inflate a
-                 * mdelay(1) loop by 10x.
-                 *
-                 * If we have nothing to blink, spin on 1 second calls to
-                 * mdelay to avoid this.
-                 */
-                mdelay(MSEC_PER_SEC);
-        }
+        return 0;
 }
 
+/* Returns how long it waited in ms */
+long (*panic_blink)(int state);
+EXPORT_SYMBOL(panic_blink);
+
 /**
  *      panic - halt the system
  *      @fmt: The text string to print
@@ -78,7 +60,8 @@ NORET_TYPE void panic(const char * fmt, ...)
 {
         static char buf[1024];
         va_list args;
-        long i;
+        long i, i_next = 0;
+        int state = 0;
 
         /*
          * It's possible to come here directly from a panic-assertion and
@@ -117,6 +100,9 @@ NORET_TYPE void panic(const char * fmt, ...)
 
         bust_spinlocks(0);
 
+        if (!panic_blink)
+                panic_blink = no_blink;
+
         if (panic_timeout > 0) {
                 /*
                  * Delay timeout seconds before rebooting the machine.
@@ -124,9 +110,13 @@ NORET_TYPE void panic(const char * fmt, ...)
                  */
                 printk(KERN_EMERG "Rebooting in %d seconds..", panic_timeout);
 
-                for (i = 0; i < panic_timeout; i++) {
+                for (i = 0; i < panic_timeout * 1000; i += PANIC_TIMER_STEP) {
                         touch_nmi_watchdog();
-                        panic_blink_one_second();
+                        if (i >= i_next) {
+                                i += panic_blink(state ^= 1);
+                                i_next = i + 3600 / PANIC_BLINK_SPD;
+                        }
+                        mdelay(PANIC_TIMER_STEP);
                 }
                 /*
                  * This will not be a clean reboot, with everything
@@ -152,9 +142,13 @@ NORET_TYPE void panic(const char * fmt, ...)
         }
 #endif
         local_irq_enable();
-        while (1) {
+        for (i = 0; ; i += PANIC_TIMER_STEP) {
                 touch_softlockup_watchdog();
-                panic_blink_one_second();
+                if (i >= i_next) {
+                        i += panic_blink(state ^= 1);
+                        i_next = i + 3600 / PANIC_BLINK_SPD;
+                }
+                mdelay(PANIC_TIMER_STEP);
         }
 }
 
@@ -344,7 +338,7 @@ static int init_oops_id(void)
 }
 late_initcall(init_oops_id);
 
-static void print_oops_end_marker(void)
+void print_oops_end_marker(void)
 {
         init_oops_id();
         printk(KERN_WARNING "---[ end trace %016llx ]---\n",
diff --git a/kernel/params.c b/kernel/params.c
index 0b30ecd53a52..08107d181758 100644
--- a/kernel/params.c
+++ b/kernel/params.c
@@ -31,6 +31,42 @@
 #define DEBUGP(fmt, a...)
 #endif
 
+/* Protects all parameters, and incidentally kmalloced_param list. */
+static DEFINE_MUTEX(param_lock);
+
+/* This just allows us to keep track of which parameters are kmalloced. */
+struct kmalloced_param {
+        struct list_head list;
+        char val[];
+};
+static LIST_HEAD(kmalloced_params);
+
+static void *kmalloc_parameter(unsigned int size)
+{
+        struct kmalloced_param *p;
+
+        p = kmalloc(sizeof(*p) + size, GFP_KERNEL);
+        if (!p)
+                return NULL;
+
+        list_add(&p->list, &kmalloced_params);
+        return p->val;
+}
+
+/* Does nothing if parameter wasn't kmalloced above. */
+static void maybe_kfree_parameter(void *param)
+{
+        struct kmalloced_param *p;
+
+        list_for_each_entry(p, &kmalloced_params, list) {
+                if (p->val == param) {
+                        list_del(&p->list);
+                        kfree(p);
+                        break;
+                }
+        }
+}
+
 static inline char dash2underscore(char c)
 {
         if (c == '-')
@@ -49,18 +85,25 @@ static inline int parameq(const char *input, const char *paramname)
 
 static int parse_one(char *param,
                      char *val,
-                     struct kernel_param *params, 
+                     const struct kernel_param *params,
                      unsigned num_params,
                      int (*handle_unknown)(char *param, char *val))
 {
         unsigned int i;
+        int err;
 
         /* Find parameter */
         for (i = 0; i < num_params; i++) {
                 if (parameq(param, params[i].name)) {
+                        /* Noone handled NULL, so do it here. */
+                        if (!val && params[i].ops->set != param_set_bool)
+                                return -EINVAL;
                         DEBUGP("They are equal!  Calling %p\n",
-                               params[i].set);
-                        return params[i].set(val, &params[i]);
+                               params[i].ops->set);
+                        mutex_lock(&param_lock);
+                        err = params[i].ops->set(val, &params[i]);
+                        mutex_unlock(&param_lock);
+                        return err;
                 }
         }
 
@@ -128,7 +171,7 @@ static char *next_arg(char *args, char **param, char **val)
 /* Args looks like "foo=bar,bar2 baz=fuz wiz". */
 int parse_args(const char *name,
                char *args,
-               struct kernel_param *params,
+               const struct kernel_param *params,
                unsigned num,
                int (*unknown)(char *param, char *val))
 {
@@ -176,22 +219,29 @@ int parse_args(const char *name,
 
 /* Lazy bastard, eh? */
 #define STANDARD_PARAM_DEF(name, type, format, tmptype, strtolfn)       \
-        int param_set_##name(const char *val, struct kernel_param *kp)  \
+        int param_set_##name(const char *val, const struct kernel_param *kp) \
         {                                                               \
                 tmptype l;                                              \
                 int ret;                                                \
                                                                         \
-                if (!val) return -EINVAL;                               \
                 ret = strtolfn(val, 0, &l);                             \
                 if (ret == -EINVAL || ((type)l != l))                   \
                         return -EINVAL;                                 \
                 *((type *)kp->arg) = l;                                 \
                 return 0;                                               \
         }                                                               \
-        int param_get_##name(char *buffer, struct kernel_param *kp)     \
+        int param_get_##name(char *buffer, const struct kernel_param *kp) \
         {                                                               \
                 return sprintf(buffer, format, *((type *)kp->arg));     \
-        }
+        }                                                               \
+        struct kernel_param_ops param_ops_##name = {                    \
+                .set = param_set_##name,                                \
+                .get = param_get_##name,                                \
+        };                                                              \
+        EXPORT_SYMBOL(param_set_##name);                                \
+        EXPORT_SYMBOL(param_get_##name);                                \
+        EXPORT_SYMBOL(param_ops_##name)
+
 
 STANDARD_PARAM_DEF(byte, unsigned char, "%c", unsigned long, strict_strtoul);
 STANDARD_PARAM_DEF(short, short, "%hi", long, strict_strtol);
@@ -201,39 +251,50 @@ STANDARD_PARAM_DEF(uint, unsigned int, "%u", unsigned long, strict_strtoul);
 STANDARD_PARAM_DEF(long, long, "%li", long, strict_strtol);
 STANDARD_PARAM_DEF(ulong, unsigned long, "%lu", unsigned long, strict_strtoul);
 
-int param_set_charp(const char *val, struct kernel_param *kp)
+int param_set_charp(const char *val, const struct kernel_param *kp)
 {
-        if (!val) {
-                printk(KERN_ERR "%s: string parameter expected\n",
-                       kp->name);
-                return -EINVAL;
-        }
-
         if (strlen(val) > 1024) {
                 printk(KERN_ERR "%s: string parameter too long\n",
                        kp->name);
                 return -ENOSPC;
         }
 
-        /* This is a hack.  We can't need to strdup in early boot, and we
+        maybe_kfree_parameter(*(char **)kp->arg);
+
+        /* This is a hack.  We can't kmalloc in early boot, and we
          * don't need to; this mangled commandline is preserved. */
         if (slab_is_available()) {
-                *(char **)kp->arg = kstrdup(val, GFP_KERNEL);
+                *(char **)kp->arg = kmalloc_parameter(strlen(val)+1);
                 if (!*(char **)kp->arg)
                         return -ENOMEM;
+                strcpy(*(char **)kp->arg, val);
         } else
                 *(const char **)kp->arg = val;
 
         return 0;
 }
+EXPORT_SYMBOL(param_set_charp);
 
-int param_get_charp(char *buffer, struct kernel_param *kp)
+int param_get_charp(char *buffer, const struct kernel_param *kp)
 {
         return sprintf(buffer, "%s", *((char **)kp->arg));
 }
+EXPORT_SYMBOL(param_get_charp);
+
+static void param_free_charp(void *arg)
+{
+        maybe_kfree_parameter(*((char **)arg));
+}
+
+struct kernel_param_ops param_ops_charp = {
+        .set = param_set_charp,
+        .get = param_get_charp,
+        .free = param_free_charp,
+};
+EXPORT_SYMBOL(param_ops_charp);
 
 /* Actually could be a bool or an int, for historical reasons. */
-int param_set_bool(const char *val, struct kernel_param *kp)
+int param_set_bool(const char *val, const struct kernel_param *kp)
 {
         bool v;
 
@@ -258,8 +319,9 @@ int param_set_bool(const char *val, struct kernel_param *kp)
                 *(int *)kp->arg = v;
         return 0;
 }
+EXPORT_SYMBOL(param_set_bool);
 
-int param_get_bool(char *buffer, struct kernel_param *kp)
+int param_get_bool(char *buffer, const struct kernel_param *kp)
 {
         bool val;
         if (kp->flags & KPARAM_ISBOOL)
@@ -270,9 +332,16 @@ int param_get_bool(char *buffer, struct kernel_param *kp)
         /* Y and N chosen as being relatively non-coder friendly */
         return sprintf(buffer, "%c", val ? 'Y' : 'N');
 }
+EXPORT_SYMBOL(param_get_bool);
+
+struct kernel_param_ops param_ops_bool = {
+        .set = param_set_bool,
+        .get = param_get_bool,
+};
+EXPORT_SYMBOL(param_ops_bool);
 
 /* This one must be bool. */
-int param_set_invbool(const char *val, struct kernel_param *kp)
+int param_set_invbool(const char *val, const struct kernel_param *kp)
 {
         int ret;
         bool boolval;
@@ -285,18 +354,26 @@ int param_set_invbool(const char *val, struct kernel_param *kp)
                 *(bool *)kp->arg = !boolval;
         return ret;
 }
+EXPORT_SYMBOL(param_set_invbool);
 
-int param_get_invbool(char *buffer, struct kernel_param *kp)
+int param_get_invbool(char *buffer, const struct kernel_param *kp)
 {
         return sprintf(buffer, "%c", (*(bool *)kp->arg) ? 'N' : 'Y');
 }
+EXPORT_SYMBOL(param_get_invbool);
+
+struct kernel_param_ops param_ops_invbool = {
+        .set = param_set_invbool,
+        .get = param_get_invbool,
+};
+EXPORT_SYMBOL(param_ops_invbool);
 
 /* We break the rule and mangle the string. */
 static int param_array(const char *name,
                        const char *val,
                        unsigned int min, unsigned int max,
                        void *elem, int elemsize,
-                       int (*set)(const char *, struct kernel_param *kp),
+                       int (*set)(const char *, const struct kernel_param *kp),
                        u16 flags,
                        unsigned int *num)
 {
@@ -309,12 +386,6 @@ static int param_array(const char *name,
         kp.arg = elem;
         kp.flags = flags;
 
-        /* No equals sign? */
-        if (!val) {
-                printk(KERN_ERR "%s: expects arguments\n", name);
-                return -EINVAL;
-        }
-
         *num = 0;
         /* We expect a comma-separated list of values. */
         do {
@@ -330,6 +401,7 @@ static int param_array(const char *name,
                 /* nul-terminate and parse */
                 save = val[len];
                 ((char *)val)[len] = '\0';
+                BUG_ON(!mutex_is_locked(&param_lock));
                 ret = set(val, &kp);
 
                 if (ret != 0)
@@ -347,17 +419,17 @@ static int param_array(const char *name,
         return 0;
 }
 
-int param_array_set(const char *val, struct kernel_param *kp)
+static int param_array_set(const char *val, const struct kernel_param *kp)
 {
         const struct kparam_array *arr = kp->arr;
         unsigned int temp_num;
 
         return param_array(kp->name, val, 1, arr->max, arr->elem,
-                           arr->elemsize, arr->set, kp->flags,
+                           arr->elemsize, arr->ops->set, kp->flags,
                            arr->num ?: &temp_num);
 }
 
-int param_array_get(char *buffer, struct kernel_param *kp)
+static int param_array_get(char *buffer, const struct kernel_param *kp)
 {
         int i, off, ret;
         const struct kparam_array *arr = kp->arr;
@@ -368,7 +440,8 @@ int param_array_get(char *buffer, struct kernel_param *kp)
                 if (i)
                         buffer[off++] = ',';
                 p.arg = arr->elem + arr->elemsize * i;
-                ret = arr->get(buffer + off, &p);
+                BUG_ON(!mutex_is_locked(&param_lock));
+                ret = arr->ops->get(buffer + off, &p);
                 if (ret < 0)
                         return ret;
                 off += ret;
@@ -377,14 +450,27 @@ int param_array_get(char *buffer, struct kernel_param *kp)
         return off;
 }
 
-int param_set_copystring(const char *val, struct kernel_param *kp)
+static void param_array_free(void *arg)
+{
+        unsigned int i;
+        const struct kparam_array *arr = arg;
+
+        if (arr->ops->free)
+                for (i = 0; i < (arr->num ? *arr->num : arr->max); i++)
+                        arr->ops->free(arr->elem + arr->elemsize * i);
+}
+
+struct kernel_param_ops param_array_ops = {
+        .set = param_array_set,
+        .get = param_array_get,
+        .free = param_array_free,
+};
+EXPORT_SYMBOL(param_array_ops);
+
+int param_set_copystring(const char *val, const struct kernel_param *kp)
 {
         const struct kparam_string *kps = kp->str;
 
-        if (!val) {
-                printk(KERN_ERR "%s: missing param set value\n", kp->name);
-                return -EINVAL;
-        }
         if (strlen(val)+1 > kps->maxlen) {
                 printk(KERN_ERR "%s: string doesn't fit in %u chars.\n",
                        kp->name, kps->maxlen-1);
@@ -393,12 +479,20 @@ int param_set_copystring(const char *val, struct kernel_param *kp)
         strcpy(kps->string, val);
         return 0;
 }
+EXPORT_SYMBOL(param_set_copystring);
 
-int param_get_string(char *buffer, struct kernel_param *kp)
+int param_get_string(char *buffer, const struct kernel_param *kp)
 {
         const struct kparam_string *kps = kp->str;
         return strlcpy(buffer, kps->string, kps->maxlen);
 }
+EXPORT_SYMBOL(param_get_string);
+
+struct kernel_param_ops param_ops_string = {
+        .set = param_set_copystring,
+        .get = param_get_string,
+};
+EXPORT_SYMBOL(param_ops_string);
 
 /* sysfs output in /sys/modules/XYZ/parameters/ */
 #define to_module_attr(n) container_of(n, struct module_attribute, attr)
@@ -409,7 +503,7 @@ extern struct kernel_param __start___param[], __stop___param[];
 struct param_attribute
 {
         struct module_attribute mattr;
-        struct kernel_param *param;
+        const struct kernel_param *param;
 };
 
 struct module_param_attrs
@@ -428,10 +522,12 @@ static ssize_t param_attr_show(struct module_attribute *mattr,
         int count;
         struct param_attribute *attribute = to_param_attr(mattr);
 
-        if (!attribute->param->get)
+        if (!attribute->param->ops->get)
                 return -EPERM;
 
-        count = attribute->param->get(buf, attribute->param);
+        mutex_lock(&param_lock);
+        count = attribute->param->ops->get(buf, attribute->param);
+        mutex_unlock(&param_lock);
         if (count > 0) {
                 strcat(buf, "\n");
                 ++count;
@@ -447,10 +543,12 @@ static ssize_t param_attr_store(struct module_attribute *mattr,
         int err;
         struct param_attribute *attribute = to_param_attr(mattr);
 
-        if (!attribute->param->set)
+        if (!attribute->param->ops->set)
                 return -EPERM;
 
-        err = attribute->param->set(buf, attribute->param);
+        mutex_lock(&param_lock);
+        err = attribute->param->ops->set(buf, attribute->param);
+        mutex_unlock(&param_lock);
         if (!err)
                 return len;
         return err;
@@ -464,6 +562,18 @@ static ssize_t param_attr_store(struct module_attribute *mattr,
 #endif
 
 #ifdef CONFIG_SYSFS
+void __kernel_param_lock(void)
+{
+        mutex_lock(&param_lock);
+}
+EXPORT_SYMBOL(__kernel_param_lock);
+
+void __kernel_param_unlock(void)
+{
+        mutex_unlock(&param_lock);
+}
+EXPORT_SYMBOL(__kernel_param_unlock);
+
 /*
  * add_sysfs_param - add a parameter to sysfs
  * @mk: struct module_kobject
@@ -475,7 +585,7 @@ static ssize_t param_attr_store(struct module_attribute *mattr,
  * if there's an error.
  */
 static __modinit int add_sysfs_param(struct module_kobject *mk,
-                                     struct kernel_param *kp,
+                                     const struct kernel_param *kp,
                                      const char *name)
 {
         struct module_param_attrs *new;
@@ -557,7 +667,7 @@ static void free_module_param_attrs(struct module_kobject *mk)
  * /sys/module/[mod->name]/parameters/
  */
 int module_param_sysfs_setup(struct module *mod,
-                             struct kernel_param *kparam,
+                             const struct kernel_param *kparam,
                              unsigned int num_params)
 {
         int i, err;
@@ -602,7 +712,11 @@ void module_param_sysfs_remove(struct module *mod)
 
 void destroy_params(const struct kernel_param *params, unsigned num)
 {
-        /* FIXME: This should free kmalloced charp parameters.  It doesn't. */
+        unsigned int i;
+
+        for (i = 0; i < num; i++)
+                if (params[i].ops->free)
+                        params[i].ops->free(params[i].arg);
 }
 
 static void __init kernel_add_sysfs_param(const char *name,
@@ -768,28 +882,3 @@ static int __init param_sysfs_init(void)
 subsys_initcall(param_sysfs_init);
 
 #endif /* CONFIG_SYSFS */
-
-EXPORT_SYMBOL(param_set_byte);
-EXPORT_SYMBOL(param_get_byte);
-EXPORT_SYMBOL(param_set_short);
-EXPORT_SYMBOL(param_get_short);
-EXPORT_SYMBOL(param_set_ushort);
-EXPORT_SYMBOL(param_get_ushort);
-EXPORT_SYMBOL(param_set_int);
-EXPORT_SYMBOL(param_get_int);
-EXPORT_SYMBOL(param_set_uint);
-EXPORT_SYMBOL(param_get_uint);
-EXPORT_SYMBOL(param_set_long);
-EXPORT_SYMBOL(param_get_long);
-EXPORT_SYMBOL(param_set_ulong);
-EXPORT_SYMBOL(param_get_ulong);
-EXPORT_SYMBOL(param_set_charp);
-EXPORT_SYMBOL(param_get_charp);
-EXPORT_SYMBOL(param_set_bool);
-EXPORT_SYMBOL(param_get_bool);
-EXPORT_SYMBOL(param_set_invbool);
-EXPORT_SYMBOL(param_get_invbool);
-EXPORT_SYMBOL(param_array_set);
-EXPORT_SYMBOL(param_array_get);
-EXPORT_SYMBOL(param_set_copystring);
-EXPORT_SYMBOL(param_get_string);
diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index ff86c558af4c..403d1804b198 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -214,7 +214,7 @@ static void perf_unpin_context(struct perf_event_context *ctx)
 
 static inline u64 perf_clock(void)
 {
-        return cpu_clock(raw_smp_processor_id());
+        return local_clock();
 }
 
 /*
@@ -675,7 +675,6 @@ group_sched_in(struct perf_event *group_event,
         struct perf_event *event, *partial_group = NULL;
         const struct pmu *pmu = group_event->pmu;
         bool txn = false;
-        int ret;
 
         if (group_event->state == PERF_EVENT_STATE_OFF)
                 return 0;
@@ -703,14 +702,8 @@ group_sched_in(struct perf_event *group_event,
                 }
         }
 
-        if (!txn)
-                return 0;
-
-        ret = pmu->commit_txn(pmu);
-        if (!ret) {
-                pmu->cancel_txn(pmu);
+        if (!txn || !pmu->commit_txn(pmu))
                 return 0;
-        }
 
 group_error:
         /*
@@ -1155,9 +1148,9 @@ static void __perf_event_sync_stat(struct perf_event *event,
          * In order to keep per-task stats reliable we need to flip the event
          * values when we flip the contexts.
          */
-        value = atomic64_read(&next_event->count);
-        value = atomic64_xchg(&event->count, value);
-        atomic64_set(&next_event->count, value);
+        value = local64_read(&next_event->count);
+        value = local64_xchg(&event->count, value);
+        local64_set(&next_event->count, value);
 
         swap(event->total_time_enabled, next_event->total_time_enabled);
         swap(event->total_time_running, next_event->total_time_running);
@@ -1547,10 +1540,10 @@ static void perf_adjust_period(struct perf_event *event, u64 nsec, u64 count)
 
         hwc->sample_period = sample_period;
 
-        if (atomic64_read(&hwc->period_left) > 8*sample_period) {
+        if (local64_read(&hwc->period_left) > 8*sample_period) {
                 perf_disable();
                 perf_event_stop(event);
-                atomic64_set(&hwc->period_left, 0);
+                local64_set(&hwc->period_left, 0);
                 perf_event_start(event);
                 perf_enable();
         }
@@ -1591,7 +1584,7 @@ static void perf_ctx_adjust_freq(struct perf_event_context *ctx)
 
                 perf_disable();
                 event->pmu->read(event);
-                now = atomic64_read(&event->count);
+                now = local64_read(&event->count);
                 delta = now - hwc->freq_count_stamp;
                 hwc->freq_count_stamp = now;
 
@@ -1743,6 +1736,11 @@ static void __perf_event_read(void *info)
         event->pmu->read(event);
 }
 
+static inline u64 perf_event_count(struct perf_event *event)
+{
+        return local64_read(&event->count) + atomic64_read(&event->child_count);
+}
+
 static u64 perf_event_read(struct perf_event *event)
 {
         /*
@@ -1762,7 +1760,7 @@ static u64 perf_event_read(struct perf_event *event)
                 raw_spin_unlock_irqrestore(&ctx->lock, flags);
         }
 
-        return atomic64_read(&event->count);
+        return perf_event_count(event);
 }
 
 /*
@@ -1883,7 +1881,7 @@ static void free_event_rcu(struct rcu_head *head)
 }
 
 static void perf_pending_sync(struct perf_event *event);
-static void perf_mmap_data_put(struct perf_mmap_data *data);
+static void perf_buffer_put(struct perf_buffer *buffer);
 
 static void free_event(struct perf_event *event)
 {
@@ -1891,7 +1889,7 @@ static void free_event(struct perf_event *event)
 
         if (!event->parent) {
                 atomic_dec(&nr_events);
-                if (event->attr.mmap)
+                if (event->attr.mmap || event->attr.mmap_data)
                         atomic_dec(&nr_mmap_events);
                 if (event->attr.comm)
                         atomic_dec(&nr_comm_events);
@@ -1899,9 +1897,9 @@ static void free_event(struct perf_event *event)
                         atomic_dec(&nr_task_events);
         }
 
-        if (event->data) {
-                perf_mmap_data_put(event->data);
-                event->data = NULL;
+        if (event->buffer) {
+                perf_buffer_put(event->buffer);
+                event->buffer = NULL;
         }
 
         if (event->destroy)
@@ -2126,13 +2124,13 @@ perf_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 static unsigned int perf_poll(struct file *file, poll_table *wait)
 {
         struct perf_event *event = file->private_data;
-        struct perf_mmap_data *data;
+        struct perf_buffer *buffer;
         unsigned int events = POLL_HUP;
 
         rcu_read_lock();
-        data = rcu_dereference(event->data);
-        if (data)
-                events = atomic_xchg(&data->poll, 0);
+        buffer = rcu_dereference(event->buffer);
+        if (buffer)
+                events = atomic_xchg(&buffer->poll, 0);
         rcu_read_unlock();
 
         poll_wait(file, &event->waitq, wait);
@@ -2143,7 +2141,7 @@ static unsigned int perf_poll(struct file *file, poll_table *wait)
 static void perf_event_reset(struct perf_event *event)
 {
         (void)perf_event_read(event);
-        atomic64_set(&event->count, 0);
+        local64_set(&event->count, 0);
         perf_event_update_userpage(event);
 }
 
@@ -2342,14 +2340,14 @@ static int perf_event_index(struct perf_event *event)
 void perf_event_update_userpage(struct perf_event *event)
 {
         struct perf_event_mmap_page *userpg;
-        struct perf_mmap_data *data;
+        struct perf_buffer *buffer;
 
         rcu_read_lock();
-        data = rcu_dereference(event->data);
-        if (!data)
+        buffer = rcu_dereference(event->buffer);
+        if (!buffer)
                 goto unlock;
 
-        userpg = data->user_page;
+        userpg = buffer->user_page;
 
         /*
          * Disable preemption so as to not let the corresponding user-space
@@ -2359,9 +2357,9 @@ void perf_event_update_userpage(struct perf_event *event)
         ++userpg->lock;
         barrier();
         userpg->index = perf_event_index(event);
-        userpg->offset = atomic64_read(&event->count);
+        userpg->offset = perf_event_count(event);
         if (event->state == PERF_EVENT_STATE_ACTIVE)
-                userpg->offset -= atomic64_read(&event->hw.prev_count);
+                userpg->offset -= local64_read(&event->hw.prev_count);
 
         userpg->time_enabled = event->total_time_enabled +
                         atomic64_read(&event->child_total_time_enabled);
@@ -2376,6 +2374,25 @@ unlock:
         rcu_read_unlock();
 }
 
+static unsigned long perf_data_size(struct perf_buffer *buffer);
+
+static void
+perf_buffer_init(struct perf_buffer *buffer, long watermark, int flags)
+{
+        long max_size = perf_data_size(buffer);
+
+        if (watermark)
+                buffer->watermark = min(max_size, watermark);
+
+        if (!buffer->watermark)
+                buffer->watermark = max_size / 2;
+
+        if (flags & PERF_BUFFER_WRITABLE)
+                buffer->writable = 1;
+
+        atomic_set(&buffer->refcount, 1);
+}
+
 #ifndef CONFIG_PERF_USE_VMALLOC
 
 /*
@@ -2383,15 +2400,15 @@ unlock:
  */
 
 static struct page *
-perf_mmap_to_page(struct perf_mmap_data *data, unsigned long pgoff)
+perf_mmap_to_page(struct perf_buffer *buffer, unsigned long pgoff)
 {
-        if (pgoff > data->nr_pages)
+        if (pgoff > buffer->nr_pages)
                 return NULL;
 
         if (pgoff == 0)
-                return virt_to_page(data->user_page);
+                return virt_to_page(buffer->user_page);
 
-        return virt_to_page(data->data_pages[pgoff - 1]);
+        return virt_to_page(buffer->data_pages[pgoff - 1]);
 }
 
 static void *perf_mmap_alloc_page(int cpu)
@@ -2407,42 +2424,44 @@ static void *perf_mmap_alloc_page(int cpu)
         return page_address(page);
 }
 
-static struct perf_mmap_data *
-perf_mmap_data_alloc(struct perf_event *event, int nr_pages)
+static struct perf_buffer *
+perf_buffer_alloc(int nr_pages, long watermark, int cpu, int flags)
 {
-        struct perf_mmap_data *data;
+        struct perf_buffer *buffer;
         unsigned long size;
         int i;
 
-        size = sizeof(struct perf_mmap_data);
+        size = sizeof(struct perf_buffer);
         size += nr_pages * sizeof(void *);
 
-        data = kzalloc(size, GFP_KERNEL);
-        if (!data)
+        buffer = kzalloc(size, GFP_KERNEL);
+        if (!buffer)
                 goto fail;
 
-        data->user_page = perf_mmap_alloc_page(event->cpu);
-        if (!data->user_page)
+        buffer->user_page = perf_mmap_alloc_page(cpu);
+        if (!buffer->user_page)
                 goto fail_user_page;
 
         for (i = 0; i < nr_pages; i++) {
-                data->data_pages[i] = perf_mmap_alloc_page(event->cpu);
-                if (!data->data_pages[i])
+                buffer->data_pages[i] = perf_mmap_alloc_page(cpu);
+                if (!buffer->data_pages[i])
                         goto fail_data_pages;
         }
 
-        data->nr_pages = nr_pages;
+        buffer->nr_pages = nr_pages;
+
+        perf_buffer_init(buffer, watermark, flags);
 
-        return data;
+        return buffer;
 
 fail_data_pages:
         for (i--; i >= 0; i--)
-                free_page((unsigned long)data->data_pages[i]);
+                free_page((unsigned long)buffer->data_pages[i]);
 
-        free_page((unsigned long)data->user_page);
+        free_page((unsigned long)buffer->user_page);
 
 fail_user_page:
-        kfree(data);
+        kfree(buffer);
 
 fail:
         return NULL;
@@ -2456,17 +2475,17 @@ static void perf_mmap_free_page(unsigned long addr)
         __free_page(page);
 }
 
-static void perf_mmap_data_free(struct perf_mmap_data *data)
+static void perf_buffer_free(struct perf_buffer *buffer)
 {
         int i;
 
-        perf_mmap_free_page((unsigned long)data->user_page);
-        for (i = 0; i < data->nr_pages; i++)
-                perf_mmap_free_page((unsigned long)data->data_pages[i]);
-        kfree(data);
+        perf_mmap_free_page((unsigned long)buffer->user_page);
+        for (i = 0; i < buffer->nr_pages; i++)
+                perf_mmap_free_page((unsigned long)buffer->data_pages[i]);
+        kfree(buffer);
 }
 
-static inline int page_order(struct perf_mmap_data *data)
+static inline int page_order(struct perf_buffer *buffer)
 {
         return 0;
 }
@@ -2479,18 +2498,18 @@ static inline int page_order(struct perf_mmap_data *data)
  * Required for architectures that have d-cache aliasing issues.
  */
 
-static inline int page_order(struct perf_mmap_data *data)
+static inline int page_order(struct perf_buffer *buffer)
 {
-        return data->page_order;
+        return buffer->page_order;
 }
 
 static struct page *
-perf_mmap_to_page(struct perf_mmap_data *data, unsigned long pgoff)
+perf_mmap_to_page(struct perf_buffer *buffer, unsigned long pgoff)
 {
-        if (pgoff > (1UL << page_order(data)))
+        if (pgoff > (1UL << page_order(buffer)))
                 return NULL;
 
-        return vmalloc_to_page((void *)data->user_page + pgoff * PAGE_SIZE);
+        return vmalloc_to_page((void *)buffer->user_page + pgoff * PAGE_SIZE);
 }
 
 static void perf_mmap_unmark_page(void *addr)
@@ -2500,57 +2519,59 @@ static void perf_mmap_unmark_page(void *addr)
         page->mapping = NULL;
 }
 
-static void perf_mmap_data_free_work(struct work_struct *work)
+static void perf_buffer_free_work(struct work_struct *work)
 {
-        struct perf_mmap_data *data;
+        struct perf_buffer *buffer;
         void *base;
         int i, nr;
 
-        data = container_of(work, struct perf_mmap_data, work);
-        nr = 1 << page_order(data);
+        buffer = container_of(work, struct perf_buffer, work);
+        nr = 1 << page_order(buffer);
 
-        base = data->user_page;
+        base = buffer->user_page;
         for (i = 0; i < nr + 1; i++)
                 perf_mmap_unmark_page(base + (i * PAGE_SIZE));
 
         vfree(base);
-        kfree(data);
+        kfree(buffer);
 }
 
-static void perf_mmap_data_free(struct perf_mmap_data *data)
+static void perf_buffer_free(struct perf_buffer *buffer)
 {
-        schedule_work(&data->work);
+        schedule_work(&buffer->work);
 }
 
-static struct perf_mmap_data *
-perf_mmap_data_alloc(struct perf_event *event, int nr_pages)
+static struct perf_buffer *
+perf_buffer_alloc(int nr_pages, long watermark, int cpu, int flags)
 {
-        struct perf_mmap_data *data;
+        struct perf_buffer *buffer;
         unsigned long size;
         void *all_buf;
 
-        size = sizeof(struct perf_mmap_data);
+        size = sizeof(struct perf_buffer);
         size += sizeof(void *);
 
-        data = kzalloc(size, GFP_KERNEL);
-        if (!data)
+        buffer = kzalloc(size, GFP_KERNEL);
+        if (!buffer)
                 goto fail;
 
-        INIT_WORK(&data->work, perf_mmap_data_free_work);
+        INIT_WORK(&buffer->work, perf_buffer_free_work);
 
         all_buf = vmalloc_user((nr_pages + 1) * PAGE_SIZE);
         if (!all_buf)
                 goto fail_all_buf;
 
-        data->user_page = all_buf;
-        data->data_pages[0] = all_buf + PAGE_SIZE;
-        data->page_order = ilog2(nr_pages);
-        data->nr_pages = 1;
+        buffer->user_page = all_buf;
+        buffer->data_pages[0] = all_buf + PAGE_SIZE;
+        buffer->page_order = ilog2(nr_pages);
+        buffer->nr_pages = 1;
+
+        perf_buffer_init(buffer, watermark, flags);
 
-        return data;
+        return buffer;
 
 fail_all_buf:
-        kfree(data);
+        kfree(buffer);
 
 fail:
         return NULL;
@@ -2558,15 +2579,15 @@ fail:
 
 #endif
 
-static unsigned long perf_data_size(struct perf_mmap_data *data)
+static unsigned long perf_data_size(struct perf_buffer *buffer)
 {
-        return data->nr_pages << (PAGE_SHIFT + page_order(data));
+        return buffer->nr_pages << (PAGE_SHIFT + page_order(buffer));
 }
 
 static int perf_mmap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 {
         struct perf_event *event = vma->vm_file->private_data;
-        struct perf_mmap_data *data;
+        struct perf_buffer *buffer;
         int ret = VM_FAULT_SIGBUS;
 
         if (vmf->flags & FAULT_FLAG_MKWRITE) {
@@ -2576,14 +2597,14 @@ static int perf_mmap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
         }
 
         rcu_read_lock();
-        data = rcu_dereference(event->data);
-        if (!data)
+        buffer = rcu_dereference(event->buffer);
+        if (!buffer)
                 goto unlock;
 
         if (vmf->pgoff && (vmf->flags & FAULT_FLAG_WRITE))
                 goto unlock;
 
-        vmf->page = perf_mmap_to_page(data, vmf->pgoff);
+        vmf->page = perf_mmap_to_page(buffer, vmf->pgoff);
         if (!vmf->page)
                 goto unlock;
 
@@ -2598,52 +2619,35 @@ unlock:
         return ret;
 }
 
-static void
-perf_mmap_data_init(struct perf_event *event, struct perf_mmap_data *data)
-{
-        long max_size = perf_data_size(data);
-
-        if (event->attr.watermark) {
-                data->watermark = min_t(long, max_size,
-                                        event->attr.wakeup_watermark);
-        }
-
-        if (!data->watermark)
-                data->watermark = max_size / 2;
-
-        atomic_set(&data->refcount, 1);
-        rcu_assign_pointer(event->data, data);
-}
-
-static void perf_mmap_data_free_rcu(struct rcu_head *rcu_head)
+static void perf_buffer_free_rcu(struct rcu_head *rcu_head)
 {
-        struct perf_mmap_data *data;
+        struct perf_buffer *buffer;
 
-        data = container_of(rcu_head, struct perf_mmap_data, rcu_head);
-        perf_mmap_data_free(data);
+        buffer = container_of(rcu_head, struct perf_buffer, rcu_head);
+        perf_buffer_free(buffer);
 }
 
-static struct perf_mmap_data *perf_mmap_data_get(struct perf_event *event)
+static struct perf_buffer *perf_buffer_get(struct perf_event *event)
 {
-        struct perf_mmap_data *data;
+        struct perf_buffer *buffer;
 
         rcu_read_lock();
-        data = rcu_dereference(event->data);
-        if (data) {
-                if (!atomic_inc_not_zero(&data->refcount))
-                        data = NULL;
+        buffer = rcu_dereference(event->buffer);
+        if (buffer) {
+                if (!atomic_inc_not_zero(&buffer->refcount))
+                        buffer = NULL;
         }
         rcu_read_unlock();
 
-        return data;
+        return buffer;
 }
 
-static void perf_mmap_data_put(struct perf_mmap_data *data)
+static void perf_buffer_put(struct perf_buffer *buffer)
 {
-        if (!atomic_dec_and_test(&data->refcount))
+        if (!atomic_dec_and_test(&buffer->refcount))
                 return;
 
-        call_rcu(&data->rcu_head, perf_mmap_data_free_rcu);
+        call_rcu(&buffer->rcu_head, perf_buffer_free_rcu);
 }
 
 static void perf_mmap_open(struct vm_area_struct *vma)
@@ -2658,16 +2662,16 @@ static void perf_mmap_close(struct vm_area_struct *vma)
         struct perf_event *event = vma->vm_file->private_data;
 
         if (atomic_dec_and_mutex_lock(&event->mmap_count, &event->mmap_mutex)) {
-                unsigned long size = perf_data_size(event->data);
+                unsigned long size = perf_data_size(event->buffer);
                 struct user_struct *user = event->mmap_user;
-                struct perf_mmap_data *data = event->data;
+                struct perf_buffer *buffer = event->buffer;
 
                 atomic_long_sub((size >> PAGE_SHIFT) + 1, &user->locked_vm);
                 vma->vm_mm->locked_vm -= event->mmap_locked;
-                rcu_assign_pointer(event->data, NULL);
+                rcu_assign_pointer(event->buffer, NULL);
                 mutex_unlock(&event->mmap_mutex);
 
-                perf_mmap_data_put(data);
+                perf_buffer_put(buffer);
                 free_uid(user);
         }
 }
@@ -2685,11 +2689,11 @@ static int perf_mmap(struct file *file, struct vm_area_struct *vma)
         unsigned long user_locked, user_lock_limit;
         struct user_struct *user = current_user();
         unsigned long locked, lock_limit;
-        struct perf_mmap_data *data;
+        struct perf_buffer *buffer;
         unsigned long vma_size;
         unsigned long nr_pages;
         long user_extra, extra;
-        int ret = 0;
+        int ret = 0, flags = 0;
 
         /*
          * Don't allow mmap() of inherited per-task counters. This would
@@ -2706,7 +2710,7 @@ static int perf_mmap(struct file *file, struct vm_area_struct *vma)
         nr_pages = (vma_size / PAGE_SIZE) - 1;
 
         /*
-         * If we have data pages ensure they're a power-of-two number, so we
+         * If we have buffer pages ensure they're a power-of-two number, so we
          * can do bitmasks instead of modulo.
          */
         if (nr_pages != 0 && !is_power_of_2(nr_pages))
@@ -2720,9 +2724,9 @@ static int perf_mmap(struct file *file, struct vm_area_struct *vma)
 
         WARN_ON_ONCE(event->ctx->parent_ctx);
         mutex_lock(&event->mmap_mutex);
-        if (event->data) {
-                if (event->data->nr_pages == nr_pages)
-                        atomic_inc(&event->data->refcount);
+        if (event->buffer) {
+                if (event->buffer->nr_pages == nr_pages)
+                        atomic_inc(&event->buffer->refcount);
                 else
                         ret = -EINVAL;
                 goto unlock;
@@ -2752,17 +2756,18 @@ static int perf_mmap(struct file *file, struct vm_area_struct *vma)
                 goto unlock;
         }
 
-        WARN_ON(event->data);
+        WARN_ON(event->buffer);
+
+        if (vma->vm_flags & VM_WRITE)
+                flags |= PERF_BUFFER_WRITABLE;
 
-        data = perf_mmap_data_alloc(event, nr_pages);
-        if (!data) {
+        buffer = perf_buffer_alloc(nr_pages, event->attr.wakeup_watermark,
+                                   event->cpu, flags);
+        if (!buffer) {
                 ret = -ENOMEM;
                 goto unlock;
         }
-
-        perf_mmap_data_init(event, data);
-        if (vma->vm_flags & VM_WRITE)
-                event->data->writable = 1;
+        rcu_assign_pointer(event->buffer, buffer);
 
         atomic_long_add(user_extra, &user->locked_vm);
         event->mmap_locked = extra;
@@ -2941,11 +2946,6 @@ __weak struct perf_callchain_entry *perf_callchain(struct pt_regs *regs)
         return NULL;
 }
 
-__weak
-void perf_arch_fetch_caller_regs(struct pt_regs *regs, unsigned long ip, int skip)
-{
-}
-
 
 /*
  * We assume there is only KVM supporting the callbacks.
@@ -2971,15 +2971,15 @@ EXPORT_SYMBOL_GPL(perf_unregister_guest_info_callbacks);
 /*
  * Output
  */
-static bool perf_output_space(struct perf_mmap_data *data, unsigned long tail,
+static bool perf_output_space(struct perf_buffer *buffer, unsigned long tail,
                               unsigned long offset, unsigned long head)
 {
         unsigned long mask;
 
-        if (!data->writable)
+        if (!buffer->writable)
                 return true;
 
-        mask = perf_data_size(data) - 1;
+        mask = perf_data_size(buffer) - 1;
 
         offset = (offset - tail) & mask;
         head   = (head   - tail) & mask;
@@ -2992,7 +2992,7 @@ static bool perf_output_space(struct perf_mmap_data *data, unsigned long tail,
 
 static void perf_output_wakeup(struct perf_output_handle *handle)
 {
-        atomic_set(&handle->data->poll, POLL_IN);
+        atomic_set(&handle->buffer->poll, POLL_IN);
 
         if (handle->nmi) {
                 handle->event->pending_wakeup = 1;
@@ -3012,45 +3012,45 @@ static void perf_output_wakeup(struct perf_output_handle *handle)
  */
 static void perf_output_get_handle(struct perf_output_handle *handle)
 {
-        struct perf_mmap_data *data = handle->data;
+        struct perf_buffer *buffer = handle->buffer;
 
         preempt_disable();
-        local_inc(&data->nest);
-        handle->wakeup = local_read(&data->wakeup);
+        local_inc(&buffer->nest);
+        handle->wakeup = local_read(&buffer->wakeup);
 }
 
 static void perf_output_put_handle(struct perf_output_handle *handle)
 {
-        struct perf_mmap_data *data = handle->data;
+        struct perf_buffer *buffer = handle->buffer;
         unsigned long head;
 
 again:
-        head = local_read(&data->head);
+        head = local_read(&buffer->head);
 
         /*
          * IRQ/NMI can happen here, which means we can miss a head update.
          */
 
-        if (!local_dec_and_test(&data->nest))
+        if (!local_dec_and_test(&buffer->nest))
                 goto out;
 
         /*
          * Publish the known good head. Rely on the full barrier implied
-         * by atomic_dec_and_test() order the data->head read and this
+         * by atomic_dec_and_test() order the buffer->head read and this
          * write.
          */
-        data->user_page->data_head = head;
+        buffer->user_page->data_head = head;
 
         /*
          * Now check if we missed an update, rely on the (compiler)
-         * barrier in atomic_dec_and_test() to re-read data->head.
+         * barrier in atomic_dec_and_test() to re-read buffer->head.
          */
-        if (unlikely(head != local_read(&data->head))) {
-                local_inc(&data->nest);
+        if (unlikely(head != local_read(&buffer->head))) {
+                local_inc(&buffer->nest);
                 goto again;
         }
 
-        if (handle->wakeup != local_read(&data->wakeup))
+        if (handle->wakeup != local_read(&buffer->wakeup))
                 perf_output_wakeup(handle);
 
  out:
@@ -3070,12 +3070,12 @@ __always_inline void perf_output_copy(struct perf_output_handle *handle,
                 buf += size;
                 handle->size -= size;
                 if (!handle->size) {
-                        struct perf_mmap_data *data = handle->data;
+                        struct perf_buffer *buffer = handle->buffer;
 
                         handle->page++;
-                        handle->page &= data->nr_pages - 1;
-                        handle->addr = data->data_pages[handle->page];
-                        handle->size = PAGE_SIZE << page_order(data);
+                        handle->page &= buffer->nr_pages - 1;
+                        handle->addr = buffer->data_pages[handle->page];
+                        handle->size = PAGE_SIZE << page_order(buffer);
                 }
         } while (len);
 }
@@ -3084,7 +3084,7 @@ int perf_output_begin(struct perf_output_handle *handle,
                       struct perf_event *event, unsigned int size,
                       int nmi, int sample)
 {
-        struct perf_mmap_data *data;
+        struct perf_buffer *buffer;
         unsigned long tail, offset, head;
         int have_lost;
         struct {
@@ -3100,19 +3100,19 @@ int perf_output_begin(struct perf_output_handle *handle,
         if (event->parent)
                 event = event->parent;
 
-        data = rcu_dereference(event->data);
-        if (!data)
+        buffer = rcu_dereference(event->buffer);
+        if (!buffer)
                 goto out;
 
-        handle->data    = data;
+        handle->buffer  = buffer;
         handle->event   = event;
         handle->nmi     = nmi;
         handle->sample  = sample;
 
-        if (!data->nr_pages)
+        if (!buffer->nr_pages)
                 goto out;
 
-        have_lost = local_read(&data->lost);
+        have_lost = local_read(&buffer->lost);
         if (have_lost)
                 size += sizeof(lost_event);
 
@@ -3124,30 +3124,30 @@ int perf_output_begin(struct perf_output_handle *handle,
                  * tail pointer. So that all reads will be completed before the
                  * write is issued.
                  */
-                tail = ACCESS_ONCE(data->user_page->data_tail);
+                tail = ACCESS_ONCE(buffer->user_page->data_tail);
                 smp_rmb();
-                offset = head = local_read(&data->head);
+                offset = head = local_read(&buffer->head);
                 head += size;
-                if (unlikely(!perf_output_space(data, tail, offset, head)))
+                if (unlikely(!perf_output_space(buffer, tail, offset, head)))
                         goto fail;
-        } while (local_cmpxchg(&data->head, offset, head) != offset);
+        } while (local_cmpxchg(&buffer->head, offset, head) != offset);
 
-        if (head - local_read(&data->wakeup) > data->watermark)
-                local_add(data->watermark, &data->wakeup);
+        if (head - local_read(&buffer->wakeup) > buffer->watermark)
+                local_add(buffer->watermark, &buffer->wakeup);
 
-        handle->page = offset >> (PAGE_SHIFT + page_order(data));
-        handle->page &= data->nr_pages - 1;
-        handle->size = offset & ((PAGE_SIZE << page_order(data)) - 1);
-        handle->addr = data->data_pages[handle->page];
+        handle->page = offset >> (PAGE_SHIFT + page_order(buffer));
+        handle->page &= buffer->nr_pages - 1;
+        handle->size = offset & ((PAGE_SIZE << page_order(buffer)) - 1);
+        handle->addr = buffer->data_pages[handle->page];
         handle->addr += handle->size;
-        handle->size = (PAGE_SIZE << page_order(data)) - handle->size;
+        handle->size = (PAGE_SIZE << page_order(buffer)) - handle->size;
 
         if (have_lost) {
                 lost_event.header.type = PERF_RECORD_LOST;
                 lost_event.header.misc = 0;
                 lost_event.header.size = sizeof(lost_event);
                 lost_event.id          = event->id;
-                lost_event.lost        = local_xchg(&data->lost, 0);
+                lost_event.lost        = local_xchg(&buffer->lost, 0);
 
                 perf_output_put(handle, lost_event);
         }
@@ -3155,7 +3155,7 @@ int perf_output_begin(struct perf_output_handle *handle,
         return 0;
 
 fail:
-        local_inc(&data->lost);
+        local_inc(&buffer->lost);
         perf_output_put_handle(handle);
 out:
         rcu_read_unlock();
@@ -3166,15 +3166,15 @@ out:
 void perf_output_end(struct perf_output_handle *handle)
 {
         struct perf_event *event = handle->event;
-        struct perf_mmap_data *data = handle->data;
+        struct perf_buffer *buffer = handle->buffer;
 
         int wakeup_events = event->attr.wakeup_events;
 
         if (handle->sample && wakeup_events) {
-                int events = local_inc_return(&data->events);
+                int events = local_inc_return(&buffer->events);
                 if (events >= wakeup_events) {
-                        local_sub(wakeup_events, &data->events);
-                        local_inc(&data->wakeup);
+                        local_sub(wakeup_events, &buffer->events);
+                        local_inc(&buffer->wakeup);
                 }
         }
 
@@ -3211,7 +3211,7 @@ static void perf_output_read_one(struct perf_output_handle *handle,
         u64 values[4];
         int n = 0;
 
-        values[n++] = atomic64_read(&event->count);
+        values[n++] = perf_event_count(event);
         if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
                 values[n++] = event->total_time_enabled +
                         atomic64_read(&event->child_total_time_enabled);
@@ -3248,7 +3248,7 @@ static void perf_output_read_group(struct perf_output_handle *handle,
         if (leader != event)
                 leader->pmu->read(leader);
 
-        values[n++] = atomic64_read(&leader->count);
+        values[n++] = perf_event_count(leader);
         if (read_format & PERF_FORMAT_ID)
                 values[n++] = primary_event_id(leader);
 
@@ -3260,7 +3260,7 @@ static void perf_output_read_group(struct perf_output_handle *handle,
                 if (sub != event)
                         sub->pmu->read(sub);
 
-                values[n++] = atomic64_read(&sub->count);
+                values[n++] = perf_event_count(sub);
                 if (read_format & PERF_FORMAT_ID)
                         values[n++] = primary_event_id(sub);
 
@@ -3491,7 +3491,7 @@ perf_event_read_event(struct perf_event *event,
 /*
  * task tracking -- fork/exit
  *
- * enabled by: attr.comm | attr.mmap | attr.task
+ * enabled by: attr.comm | attr.mmap | attr.mmap_data | attr.task
  */
 
 struct perf_task_event {
@@ -3541,7 +3541,8 @@ static int perf_event_task_match(struct perf_event *event)
         if (event->cpu != -1 && event->cpu != smp_processor_id())
                 return 0;
 
-        if (event->attr.comm || event->attr.mmap || event->attr.task)
+        if (event->attr.comm || event->attr.mmap ||
+            event->attr.mmap_data || event->attr.task)
                 return 1;
 
         return 0;
@@ -3766,7 +3767,8 @@ static void perf_event_mmap_output(struct perf_event *event,
 }
 
 static int perf_event_mmap_match(struct perf_event *event,
-                                   struct perf_mmap_event *mmap_event)
+                                   struct perf_mmap_event *mmap_event,
+                                   int executable)
 {
         if (event->state < PERF_EVENT_STATE_INACTIVE)
                 return 0;
@@ -3774,19 +3776,21 @@ static int perf_event_mmap_match(struct perf_event *event,
         if (event->cpu != -1 && event->cpu != smp_processor_id())
                 return 0;
 
-        if (event->attr.mmap)
+        if ((!executable && event->attr.mmap_data) ||
+            (executable && event->attr.mmap))
                 return 1;
 
         return 0;
 }
 
 static void perf_event_mmap_ctx(struct perf_event_context *ctx,
-                                  struct perf_mmap_event *mmap_event)
+                                  struct perf_mmap_event *mmap_event,
+                                  int executable)
 {
         struct perf_event *event;
 
         list_for_each_entry_rcu(event, &ctx->event_list, event_entry) {
-                if (perf_event_mmap_match(event, mmap_event))
+                if (perf_event_mmap_match(event, mmap_event, executable))
                         perf_event_mmap_output(event, mmap_event);
         }
 }
@@ -3830,6 +3834,14 @@ static void perf_event_mmap_event(struct perf_mmap_event *mmap_event)
                 if (!vma->vm_mm) {
                         name = strncpy(tmp, "[vdso]", sizeof(tmp));
                         goto got_name;
+                } else if (vma->vm_start <= vma->vm_mm->start_brk &&
+                                vma->vm_end >= vma->vm_mm->brk) {
+                        name = strncpy(tmp, "[heap]", sizeof(tmp));
+                        goto got_name;
+                } else if (vma->vm_start <= vma->vm_mm->start_stack &&
+                                vma->vm_end >= vma->vm_mm->start_stack) {
+                        name = strncpy(tmp, "[stack]", sizeof(tmp));
+                        goto got_name;
                 }
 
                 name = strncpy(tmp, "//anon", sizeof(tmp));
@@ -3846,17 +3858,17 @@ got_name:
 
         rcu_read_lock();
         cpuctx = &get_cpu_var(perf_cpu_context);
-        perf_event_mmap_ctx(&cpuctx->ctx, mmap_event);
+        perf_event_mmap_ctx(&cpuctx->ctx, mmap_event, vma->vm_flags & VM_EXEC);
         ctx = rcu_dereference(current->perf_event_ctxp);
         if (ctx)
-                perf_event_mmap_ctx(ctx, mmap_event);
+                perf_event_mmap_ctx(ctx, mmap_event, vma->vm_flags & VM_EXEC);
         put_cpu_var(perf_cpu_context);
         rcu_read_unlock();
 
         kfree(buf);
 }
 
-void __perf_event_mmap(struct vm_area_struct *vma)
+void perf_event_mmap(struct vm_area_struct *vma)
 {
         struct perf_mmap_event mmap_event;
 
@@ -4018,14 +4030,14 @@ static u64 perf_swevent_set_period(struct perf_event *event)
         hwc->last_period = hwc->sample_period;
 
 again:
-        old = val = atomic64_read(&hwc->period_left);
+        old = val = local64_read(&hwc->period_left);
         if (val < 0)
                 return 0;
 
         nr = div64_u64(period + val, period);
         offset = nr * period;
         val -= offset;
-        if (atomic64_cmpxchg(&hwc->period_left, old, val) != old)
+        if (local64_cmpxchg(&hwc->period_left, old, val) != old)
                 goto again;
 
         return nr;
@@ -4064,7 +4076,7 @@ static void perf_swevent_add(struct perf_event *event, u64 nr,
 {
         struct hw_perf_event *hwc = &event->hw;
 
-        atomic64_add(nr, &event->count);
+        local64_add(nr, &event->count);
 
         if (!regs)
                 return;
@@ -4075,7 +4087,7 @@ static void perf_swevent_add(struct perf_event *event, u64 nr,
         if (nr == 1 && hwc->sample_period == 1 && !event->attr.freq)
                 return perf_swevent_overflow(event, 1, nmi, data, regs);
 
-        if (atomic64_add_negative(nr, &hwc->period_left))
+        if (local64_add_negative(nr, &hwc->period_left))
                 return;
 
         perf_swevent_overflow(event, 0, nmi, data, regs);
@@ -4213,14 +4225,12 @@ int perf_swevent_get_recursion_context(void)
 }
 EXPORT_SYMBOL_GPL(perf_swevent_get_recursion_context);
 
-void perf_swevent_put_recursion_context(int rctx)
+void inline perf_swevent_put_recursion_context(int rctx)
 {
         struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
         barrier();
         cpuctx->recursion[rctx]--;
 }
-EXPORT_SYMBOL_GPL(perf_swevent_put_recursion_context);
-
 
 void __perf_sw_event(u32 event_id, u64 nr, int nmi,
                             struct pt_regs *regs, u64 addr)
@@ -4368,8 +4378,8 @@ static void cpu_clock_perf_event_update(struct perf_event *event)
         u64 now;
 
         now = cpu_clock(cpu);
-        prev = atomic64_xchg(&event->hw.prev_count, now);
-        atomic64_add(now - prev, &event->count);
+        prev = local64_xchg(&event->hw.prev_count, now);
+        local64_add(now - prev, &event->count);
 }
 
 static int cpu_clock_perf_event_enable(struct perf_event *event)
@@ -4377,7 +4387,7 @@ static int cpu_clock_perf_event_enable(struct perf_event *event)
         struct hw_perf_event *hwc = &event->hw;
         int cpu = raw_smp_processor_id();
 
-        atomic64_set(&hwc->prev_count, cpu_clock(cpu));
+        local64_set(&hwc->prev_count, cpu_clock(cpu));
         perf_swevent_start_hrtimer(event);
 
         return 0;
@@ -4409,9 +4419,9 @@ static void task_clock_perf_event_update(struct perf_event *event, u64 now)
         u64 prev;
         s64 delta;
 
-        prev = atomic64_xchg(&event->hw.prev_count, now);
+        prev = local64_xchg(&event->hw.prev_count, now);
         delta = now - prev;
-        atomic64_add(delta, &event->count);
+        local64_add(delta, &event->count);
 }
 
 static int task_clock_perf_event_enable(struct perf_event *event)
@@ -4421,7 +4431,7 @@ static int task_clock_perf_event_enable(struct perf_event *event)
 
         now = event->ctx->time;
 
-        atomic64_set(&hwc->prev_count, now);
+        local64_set(&hwc->prev_count, now);
 
         perf_swevent_start_hrtimer(event);
 
@@ -4601,7 +4611,7 @@ static int perf_tp_event_match(struct perf_event *event,
 }
 
 void perf_tp_event(u64 addr, u64 count, void *record, int entry_size,
-                   struct pt_regs *regs, struct hlist_head *head)
+                   struct pt_regs *regs, struct hlist_head *head, int rctx)
 {
         struct perf_sample_data data;
         struct perf_event *event;
@@ -4615,12 +4625,12 @@ void perf_tp_event(u64 addr, u64 count, void *record, int entry_size,
         perf_sample_data_init(&data, addr);
         data.raw = &raw;
 
-        rcu_read_lock();
         hlist_for_each_entry_rcu(event, node, head, hlist_entry) {
                 if (perf_tp_event_match(event, &data, regs))
                         perf_swevent_add(event, count, 1, &data, regs);
         }
-        rcu_read_unlock();
+
+        perf_swevent_put_recursion_context(rctx);
 }
 EXPORT_SYMBOL_GPL(perf_tp_event);
 
@@ -4864,7 +4874,7 @@ perf_event_alloc(struct perf_event_attr *attr,
                 hwc->sample_period = 1;
         hwc->last_period = hwc->sample_period;
 
-        atomic64_set(&hwc->period_left, hwc->sample_period);
+        local64_set(&hwc->period_left, hwc->sample_period);
 
         /*
          * we currently do not support PERF_FORMAT_GROUP on inherited events
@@ -4913,7 +4923,7 @@ done:
 
         if (!event->parent) {
                 atomic_inc(&nr_events);
-                if (event->attr.mmap)
+                if (event->attr.mmap || event->attr.mmap_data)
                         atomic_inc(&nr_mmap_events);
                 if (event->attr.comm)
                         atomic_inc(&nr_comm_events);
@@ -5007,7 +5017,7 @@ err_size:
 static int
 perf_event_set_output(struct perf_event *event, struct perf_event *output_event)
 {
-        struct perf_mmap_data *data = NULL, *old_data = NULL;
+        struct perf_buffer *buffer = NULL, *old_buffer = NULL;
         int ret = -EINVAL;
 
         if (!output_event)
@@ -5037,19 +5047,19 @@ set:
 
         if (output_event) {
                 /* get the buffer we want to redirect to */
-                data = perf_mmap_data_get(output_event);
-                if (!data)
+                buffer = perf_buffer_get(output_event);
+                if (!buffer)
                         goto unlock;
         }
 
-        old_data = event->data;
-        rcu_assign_pointer(event->data, data);
+        old_buffer = event->buffer;
+        rcu_assign_pointer(event->buffer, buffer);
         ret = 0;
 unlock:
         mutex_unlock(&event->mmap_mutex);
 
-        if (old_data)
-                perf_mmap_data_put(old_data);
+        if (old_buffer)
+                perf_buffer_put(old_buffer);
 out:
         return ret;
 }
@@ -5298,7 +5308,7 @@ inherit_event(struct perf_event *parent_event,
                 hwc->sample_period = sample_period;
                 hwc->last_period   = sample_period;
 
-                atomic64_set(&hwc->period_left, sample_period);
+                local64_set(&hwc->period_left, sample_period);
         }
 
         child_event->overflow_handler = parent_event->overflow_handler;
@@ -5359,12 +5369,12 @@ static void sync_child_event(struct perf_event *child_event,
         if (child_event->attr.inherit_stat)
                 perf_event_read_event(child_event, child);
 
-        child_val = atomic64_read(&child_event->count);
+        child_val = perf_event_count(child_event);
 
         /*
          * Add back the child's count to the parent's count:
          */
-        atomic64_add(child_val, &parent_event->count);
+        atomic64_add(child_val, &parent_event->child_count);
         atomic64_add(child_event->total_time_enabled,
                      &parent_event->child_total_time_enabled);
         atomic64_add(child_event->total_time_running,
diff --git a/kernel/pid.c b/kernel/pid.c
index e9fd8c132d26..d55c6fb8d087 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -122,6 +122,43 @@ static void free_pidmap(struct upid *upid)
         atomic_inc(&map->nr_free);
 }
 
+/*
+ * If we started walking pids at 'base', is 'a' seen before 'b'?
+ */
+static int pid_before(int base, int a, int b)
+{
+        /*
+         * This is the same as saying
+         *
+         * (a - base + MAXUINT) % MAXUINT < (b - base + MAXUINT) % MAXUINT
+         * and that mapping orders 'a' and 'b' with respect to 'base'.
+         */
+        return (unsigned)(a - base) < (unsigned)(b - base);
+}
+
+/*
+ * We might be racing with someone else trying to set pid_ns->last_pid.
+ * We want the winner to have the "later" value, because if the
+ * "earlier" value prevails, then a pid may get reused immediately.
+ *
+ * Since pids rollover, it is not sufficient to just pick the bigger
+ * value.  We have to consider where we started counting from.
+ *
+ * 'base' is the value of pid_ns->last_pid that we observed when
+ * we started looking for a pid.
+ *
+ * 'pid' is the pid that we eventually found.
+ */
+static void set_last_pid(struct pid_namespace *pid_ns, int base, int pid)
+{
+        int prev;
+        int last_write = base;
+        do {
+                prev = last_write;
+                last_write = cmpxchg(&pid_ns->last_pid, prev, pid);
+        } while ((prev != last_write) && (pid_before(base, last_write, pid)));
+}
+
 static int alloc_pidmap(struct pid_namespace *pid_ns)
 {
         int i, offset, max_scan, pid, last = pid_ns->last_pid;
@@ -132,7 +169,12 @@ static int alloc_pidmap(struct pid_namespace *pid_ns)
                 pid = RESERVED_PIDS;
         offset = pid & BITS_PER_PAGE_MASK;
         map = &pid_ns->pidmap[pid/BITS_PER_PAGE];
-        max_scan = (pid_max + BITS_PER_PAGE - 1)/BITS_PER_PAGE - !offset;
+        /*
+         * If last_pid points into the middle of the map->page we
+         * want to scan this bitmap block twice, the second time
+         * we start with offset == 0 (or RESERVED_PIDS).
+         */
+        max_scan = DIV_ROUND_UP(pid_max, BITS_PER_PAGE) - !offset;
         for (i = 0; i <= max_scan; ++i) {
                 if (unlikely(!map->page)) {
                         void *page = kzalloc(PAGE_SIZE, GFP_KERNEL);
@@ -154,20 +196,12 @@ static int alloc_pidmap(struct pid_namespace *pid_ns)
                         do {
                                 if (!test_and_set_bit(offset, map->page)) {
                                         atomic_dec(&map->nr_free);
-                                        pid_ns->last_pid = pid;
+                                        set_last_pid(pid_ns, last, pid);
                                         return pid;
                                 }
                                 offset = find_next_offset(map, offset);
                                 pid = mk_pid(pid_ns, map, offset);
-                        /*
-                         * find_next_offset() found a bit, the pid from it
-                         * is in-bounds, and if we fell back to the last
-                         * bitmap block and the final block was the same
-                         * as the starting point, pid is before last_pid.
-                         */
-                        } while (offset < BITS_PER_PAGE && pid < pid_max &&
-                                        (i != max_scan || pid < last ||
-                                            !((last+1) & BITS_PER_PAGE_MASK)));
+                        } while (offset < BITS_PER_PAGE && pid < pid_max);
                 }
                 if (map < &pid_ns->pidmap[(pid_max-1)/BITS_PER_PAGE]) {
                         ++map;
diff --git a/kernel/pm_qos_params.c b/kernel/pm_qos_params.c
index f42d3f737a33..b7e4c362361b 100644
--- a/kernel/pm_qos_params.c
+++ b/kernel/pm_qos_params.c
@@ -48,59 +48,49 @@
  * or pm_qos_object list and pm_qos_objects need to happen with pm_qos_lock
  * held, taken with _irqsave.  One lock to rule them all
  */
-struct pm_qos_request_list {
-        struct list_head list;
-        union {
-                s32 value;
-                s32 usec;
-                s32 kbps;
-        };
-        int pm_qos_class;
+enum pm_qos_type {
+        PM_QOS_MAX,             /* return the largest value */
+        PM_QOS_MIN              /* return the smallest value */
 };
 
-static s32 max_compare(s32 v1, s32 v2);
-static s32 min_compare(s32 v1, s32 v2);
-
 struct pm_qos_object {
-        struct pm_qos_request_list requests;
+        struct plist_head requests;
         struct blocking_notifier_head *notifiers;
         struct miscdevice pm_qos_power_miscdev;
         char *name;
         s32 default_value;
-        atomic_t target_value;
-        s32 (*comparitor)(s32, s32);
+        enum pm_qos_type type;
 };
 
+static DEFINE_SPINLOCK(pm_qos_lock);
+
 static struct pm_qos_object null_pm_qos;
 static BLOCKING_NOTIFIER_HEAD(cpu_dma_lat_notifier);
 static struct pm_qos_object cpu_dma_pm_qos = {
-        .requests = {LIST_HEAD_INIT(cpu_dma_pm_qos.requests.list)},
+        .requests = PLIST_HEAD_INIT(cpu_dma_pm_qos.requests, pm_qos_lock),
         .notifiers = &cpu_dma_lat_notifier,
         .name = "cpu_dma_latency",
         .default_value = 2000 * USEC_PER_SEC,
-        .target_value = ATOMIC_INIT(2000 * USEC_PER_SEC),
-        .comparitor = min_compare
+        .type = PM_QOS_MIN,
 };
 
 static BLOCKING_NOTIFIER_HEAD(network_lat_notifier);
 static struct pm_qos_object network_lat_pm_qos = {
-        .requests = {LIST_HEAD_INIT(network_lat_pm_qos.requests.list)},
+        .requests = PLIST_HEAD_INIT(network_lat_pm_qos.requests, pm_qos_lock),
         .notifiers = &network_lat_notifier,
         .name = "network_latency",
         .default_value = 2000 * USEC_PER_SEC,
-        .target_value = ATOMIC_INIT(2000 * USEC_PER_SEC),
-        .comparitor = min_compare
+        .type = PM_QOS_MIN
 };
 
 
 static BLOCKING_NOTIFIER_HEAD(network_throughput_notifier);
 static struct pm_qos_object network_throughput_pm_qos = {
-        .requests = {LIST_HEAD_INIT(network_throughput_pm_qos.requests.list)},
+        .requests = PLIST_HEAD_INIT(network_throughput_pm_qos.requests, pm_qos_lock),
         .notifiers = &network_throughput_notifier,
         .name = "network_throughput",
         .default_value = 0,
-        .target_value = ATOMIC_INIT(0),
-        .comparitor = max_compare
+        .type = PM_QOS_MAX,
 };
 
 
@@ -111,8 +101,6 @@ static struct pm_qos_object *pm_qos_array[] = {
         &network_throughput_pm_qos
 };
 
-static DEFINE_SPINLOCK(pm_qos_lock);
-
 static ssize_t pm_qos_power_write(struct file *filp, const char __user *buf,
                 size_t count, loff_t *f_pos);
 static int pm_qos_power_open(struct inode *inode, struct file *filp);
@@ -124,46 +112,55 @@ static const struct file_operations pm_qos_power_fops = {
         .release = pm_qos_power_release,
 };
 
-/* static helper functions */
-static s32 max_compare(s32 v1, s32 v2)
+/* unlocked internal variant */
+static inline int pm_qos_get_value(struct pm_qos_object *o)
 {
-        return max(v1, v2);
-}
+        if (plist_head_empty(&o->requests))
+                return o->default_value;
 
-static s32 min_compare(s32 v1, s32 v2)
-{
-        return min(v1, v2);
-}
+        switch (o->type) {
+        case PM_QOS_MIN:
+                return plist_last(&o->requests)->prio;
+
+        case PM_QOS_MAX:
+                return plist_first(&o->requests)->prio;
 
+        default:
+                /* runtime check for not using enum */
+                BUG();
+        }
+}
 
-static void update_target(int pm_qos_class)
+static void update_target(struct pm_qos_object *o, struct plist_node *node,
+                          int del, int value)
 {
-        s32 extreme_value;
-        struct pm_qos_request_list *node;
         unsigned long flags;
-        int call_notifier = 0;
+        int prev_value, curr_value;
 
         spin_lock_irqsave(&pm_qos_lock, flags);
-        extreme_value = pm_qos_array[pm_qos_class]->default_value;
-        list_for_each_entry(node,
-                        &pm_qos_array[pm_qos_class]->requests.list, list) {
-                extreme_value = pm_qos_array[pm_qos_class]->comparitor(
-                                extreme_value, node->value);
-        }
-        if (atomic_read(&pm_qos_array[pm_qos_class]->target_value) !=
-                        extreme_value) {
-                call_notifier = 1;
-                atomic_set(&pm_qos_array[pm_qos_class]->target_value,
-                                extreme_value);
-                pr_debug(KERN_ERR "new target for qos %d is %d\n", pm_qos_class,
-                        atomic_read(&pm_qos_array[pm_qos_class]->target_value));
+        prev_value = pm_qos_get_value(o);
+        /* PM_QOS_DEFAULT_VALUE is a signal that the value is unchanged */
+        if (value != PM_QOS_DEFAULT_VALUE) {
+                /*
+                 * to change the list, we atomically remove, reinit
+                 * with new value and add, then see if the extremal
+                 * changed
+                 */
+                plist_del(node, &o->requests);
+                plist_node_init(node, value);
+                plist_add(node, &o->requests);
+        } else if (del) {
+                plist_del(node, &o->requests);
+        } else {
+                plist_add(node, &o->requests);
         }
+        curr_value = pm_qos_get_value(o);
         spin_unlock_irqrestore(&pm_qos_lock, flags);
 
-        if (call_notifier)
-                blocking_notifier_call_chain(
-                                pm_qos_array[pm_qos_class]->notifiers,
-                                        (unsigned long) extreme_value, NULL);
+        if (prev_value != curr_value)
+                blocking_notifier_call_chain(o->notifiers,
+                                             (unsigned long)curr_value,
+                                             NULL);
 }
 
 static int register_pm_qos_misc(struct pm_qos_object *qos)
@@ -196,42 +193,53 @@ static int find_pm_qos_object_by_minor(int minor)
  */
 int pm_qos_request(int pm_qos_class)
 {
-        return atomic_read(&pm_qos_array[pm_qos_class]->target_value);
+        unsigned long flags;
+        int value;
+
+        spin_lock_irqsave(&pm_qos_lock, flags);
+        value = pm_qos_get_value(pm_qos_array[pm_qos_class]);
+        spin_unlock_irqrestore(&pm_qos_lock, flags);
+
+        return value;
 }
 EXPORT_SYMBOL_GPL(pm_qos_request);
 
+int pm_qos_request_active(struct pm_qos_request_list *req)
+{
+        return req->pm_qos_class != 0;
+}
+EXPORT_SYMBOL_GPL(pm_qos_request_active);
+
 /**
  * pm_qos_add_request - inserts new qos request into the list
- * @pm_qos_class: identifies which list of qos request to us
+ * @dep: pointer to a preallocated handle
+ * @pm_qos_class: identifies which list of qos request to use
  * @value: defines the qos request
  *
  * This function inserts a new entry in the pm_qos_class list of requested qos
  * performance characteristics.  It recomputes the aggregate QoS expectations
- * for the pm_qos_class of parameters, and returns the pm_qos_request list
- * element as a handle for use in updating and removal.  Call needs to save
- * this handle for later use.
+ * for the pm_qos_class of parameters and initializes the pm_qos_request_list
+ * handle.  Caller needs to save this handle for later use in updates and
+ * removal.
  */
-struct pm_qos_request_list *pm_qos_add_request(int pm_qos_class, s32 value)
+
+void pm_qos_add_request(struct pm_qos_request_list *dep,
+                        int pm_qos_class, s32 value)
 {
-        struct pm_qos_request_list *dep;
-        unsigned long flags;
+        struct pm_qos_object *o =  pm_qos_array[pm_qos_class];
+        int new_value;
 
-        dep = kzalloc(sizeof(struct pm_qos_request_list), GFP_KERNEL);
-        if (dep) {
-                if (value == PM_QOS_DEFAULT_VALUE)
-                        dep->value = pm_qos_array[pm_qos_class]->default_value;
-                else
-                        dep->value = value;
-                dep->pm_qos_class = pm_qos_class;
-
-                spin_lock_irqsave(&pm_qos_lock, flags);
-                list_add(&dep->list,
-                        &pm_qos_array[pm_qos_class]->requests.list);
-                spin_unlock_irqrestore(&pm_qos_lock, flags);
-                update_target(pm_qos_class);
+        if (pm_qos_request_active(dep)) {
+                WARN(1, KERN_ERR "pm_qos_add_request() called for already added request\n");
+                return;
         }
-
-        return dep;
+        if (value == PM_QOS_DEFAULT_VALUE)
+                new_value = o->default_value;
+        else
+                new_value = value;
+        plist_node_init(&dep->list, new_value);
+        dep->pm_qos_class = pm_qos_class;
+        update_target(o, &dep->list, 0, PM_QOS_DEFAULT_VALUE);
 }
 EXPORT_SYMBOL_GPL(pm_qos_add_request);
 
@@ -246,27 +254,28 @@ EXPORT_SYMBOL_GPL(pm_qos_add_request);
  * Attempts are made to make this code callable on hot code paths.
  */
 void pm_qos_update_request(struct pm_qos_request_list *pm_qos_req,
-                s32 new_value)
+                           s32 new_value)
 {
-        unsigned long flags;
-        int pending_update = 0;
         s32 temp;
+        struct pm_qos_object *o;
+
+        if (!pm_qos_req) /*guard against callers passing in null */
+                return;
 
-        if (pm_qos_req) { /*guard against callers passing in null */
-                spin_lock_irqsave(&pm_qos_lock, flags);
-                if (new_value == PM_QOS_DEFAULT_VALUE)
-                        temp = pm_qos_array[pm_qos_req->pm_qos_class]->default_value;
-                else
-                        temp = new_value;
-
-                if (temp != pm_qos_req->value) {
-                        pending_update = 1;
-                        pm_qos_req->value = temp;
-                }
-                spin_unlock_irqrestore(&pm_qos_lock, flags);
-                if (pending_update)
-                        update_target(pm_qos_req->pm_qos_class);
+        if (!pm_qos_request_active(pm_qos_req)) {
+                WARN(1, KERN_ERR "pm_qos_update_request() called for unknown object\n");
+                return;
         }
+
+        o = pm_qos_array[pm_qos_req->pm_qos_class];
+
+        if (new_value == PM_QOS_DEFAULT_VALUE)
+                temp = o->default_value;
+        else
+                temp = new_value;
+
+        if (temp != pm_qos_req->list.prio)
+                update_target(o, &pm_qos_req->list, 0, temp);
 }
 EXPORT_SYMBOL_GPL(pm_qos_update_request);
 
@@ -280,19 +289,20 @@ EXPORT_SYMBOL_GPL(pm_qos_update_request);
  */
 void pm_qos_remove_request(struct pm_qos_request_list *pm_qos_req)
 {
-        unsigned long flags;
-        int qos_class;
+        struct pm_qos_object *o;
 
         if (pm_qos_req == NULL)
                 return;
                 /* silent return to keep pcm code cleaner */
 
-        qos_class = pm_qos_req->pm_qos_class;
-        spin_lock_irqsave(&pm_qos_lock, flags);
-        list_del(&pm_qos_req->list);
-        kfree(pm_qos_req);
-        spin_unlock_irqrestore(&pm_qos_lock, flags);
-        update_target(qos_class);
+        if (!pm_qos_request_active(pm_qos_req)) {
+                WARN(1, KERN_ERR "pm_qos_remove_request() called for unknown object\n");
+                return;
+        }
+
+        o = pm_qos_array[pm_qos_req->pm_qos_class];
+        update_target(o, &pm_qos_req->list, 1, PM_QOS_DEFAULT_VALUE);
+        memset(pm_qos_req, 0, sizeof(*pm_qos_req));
 }
 EXPORT_SYMBOL_GPL(pm_qos_remove_request);
 
@@ -340,8 +350,12 @@ static int pm_qos_power_open(struct inode *inode, struct file *filp)
 
         pm_qos_class = find_pm_qos_object_by_minor(iminor(inode));
         if (pm_qos_class >= 0) {
-                filp->private_data = (void *) pm_qos_add_request(pm_qos_class,
-                                PM_QOS_DEFAULT_VALUE);
+               struct pm_qos_request_list *req = kzalloc(sizeof(*req), GFP_KERNEL);
+                if (!req)
+                        return -ENOMEM;
+
+                pm_qos_add_request(req, pm_qos_class, PM_QOS_DEFAULT_VALUE);
+                filp->private_data = req;
 
                 if (filp->private_data)
                         return 0;
@@ -353,8 +367,9 @@ static int pm_qos_power_release(struct inode *inode, struct file *filp)
 {
         struct pm_qos_request_list *req;
 
-        req = (struct pm_qos_request_list *)filp->private_data;
+        req = filp->private_data;
         pm_qos_remove_request(req);
+        kfree(req);
 
         return 0;
 }
diff --git a/kernel/posix-cpu-timers.c b/kernel/posix-cpu-timers.c
index 9829646d399c..6842eeba5879 100644
--- a/kernel/posix-cpu-timers.c
+++ b/kernel/posix-cpu-timers.c
@@ -16,13 +16,13 @@
  * siglock protection since other code may update expiration cache as
  * well.
  */
-void update_rlimit_cpu(unsigned long rlim_new)
+void update_rlimit_cpu(struct task_struct *task, unsigned long rlim_new)
 {
         cputime_t cputime = secs_to_cputime(rlim_new);
 
-        spin_lock_irq(&current->sighand->siglock);
-        set_process_cpu_timer(current, CPUCLOCK_PROF, &cputime, NULL);
-        spin_unlock_irq(&current->sighand->siglock);
+        spin_lock_irq(&task->sighand->siglock);
+        set_process_cpu_timer(task, CPUCLOCK_PROF, &cputime, NULL);
+        spin_unlock_irq(&task->sighand->siglock);
 }
 
 static int check_clock(const clockid_t which_clock)
@@ -232,31 +232,24 @@ static int cpu_clock_sample(const clockid_t which_clock, struct task_struct *p,
 
 void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times)
 {
-        struct sighand_struct *sighand;
-        struct signal_struct *sig;
+        struct signal_struct *sig = tsk->signal;
         struct task_struct *t;
 
-        *times = INIT_CPUTIME;
+        times->utime = sig->utime;
+        times->stime = sig->stime;
+        times->sum_exec_runtime = sig->sum_sched_runtime;
 
         rcu_read_lock();
-        sighand = rcu_dereference(tsk->sighand);
-        if (!sighand)
+        /* make sure we can trust tsk->thread_group list */
+        if (!likely(pid_alive(tsk)))
                 goto out;
 
-        sig = tsk->signal;
-
         t = tsk;
         do {
                 times->utime = cputime_add(times->utime, t->utime);
                 times->stime = cputime_add(times->stime, t->stime);
                 times->sum_exec_runtime += t->se.sum_exec_runtime;
-
-                t = next_thread(t);
-        } while (t != tsk);
-
-        times->utime = cputime_add(times->utime, sig->utime);
-        times->stime = cputime_add(times->stime, sig->stime);
-        times->sum_exec_runtime += sig->sum_sched_runtime;
+        } while_each_thread(tsk, t);
 out:
         rcu_read_unlock();
 }
@@ -1279,10 +1272,6 @@ static inline int fastpath_timer_check(struct task_struct *tsk)
 {
         struct signal_struct *sig;
 
-        /* tsk == current, ensure it is safe to use ->signal/sighand */
-        if (unlikely(tsk->exit_state))
-                return 0;
-
         if (!task_cputime_zero(&tsk->cputime_expires)) {
                 struct task_cputime task_sample = {
                         .utime = tsk->utime,
@@ -1298,7 +1287,10 @@ static inline int fastpath_timer_check(struct task_struct *tsk)
         if (sig->cputimer.running) {
                 struct task_cputime group_sample;
 
-                thread_group_cputimer(tsk, &group_sample);
+                spin_lock(&sig->cputimer.lock);
+                group_sample = sig->cputimer.cputime;
+                spin_unlock(&sig->cputimer.lock);
+
                 if (task_cputime_expired(&group_sample, &sig->cputime_expires))
                         return 1;
         }
@@ -1315,6 +1307,7 @@ void run_posix_cpu_timers(struct task_struct *tsk)
 {
         LIST_HEAD(firing);
         struct k_itimer *timer, *next;
+        unsigned long flags;
 
         BUG_ON(!irqs_disabled());
 
@@ -1325,7 +1318,8 @@ void run_posix_cpu_timers(struct task_struct *tsk)
         if (!fastpath_timer_check(tsk))
                 return;
 
-        spin_lock(&tsk->sighand->siglock);
+        if (!lock_task_sighand(tsk, &flags))
+                return;
         /*
          * Here we take off tsk->signal->cpu_timers[N] and
          * tsk->cpu_timers[N] all the timers that are firing, and
@@ -1347,7 +1341,7 @@ void run_posix_cpu_timers(struct task_struct *tsk)
          * that gets the timer lock before we do will give it up and
          * spin until we've taken care of that timer below.
          */
-        spin_unlock(&tsk->sighand->siglock);
+        unlock_task_sighand(tsk, &flags);
 
         /*
          * Now that all the timers on our list have the firing flag,
diff --git a/kernel/posix-timers.c b/kernel/posix-timers.c
index ad723420acc3..9ca4973f736d 100644
--- a/kernel/posix-timers.c
+++ b/kernel/posix-timers.c
@@ -560,11 +560,6 @@ SYSCALL_DEFINE3(timer_create, const clockid_t, which_clock,
         new_timer->it_clock = which_clock;
         new_timer->it_overrun = -1;
 
-        if (copy_to_user(created_timer_id,
-                         &new_timer_id, sizeof (new_timer_id))) {
-                error = -EFAULT;
-                goto out;
-        }
         if (timer_event_spec) {
                 if (copy_from_user(&event, timer_event_spec, sizeof (event))) {
                         error = -EFAULT;
@@ -590,6 +585,12 @@ SYSCALL_DEFINE3(timer_create, const clockid_t, which_clock,
         new_timer->sigq->info.si_tid   = new_timer->it_id;
         new_timer->sigq->info.si_code  = SI_TIMER;
 
+        if (copy_to_user(created_timer_id,
+                         &new_timer_id, sizeof (new_timer_id))) {
+                error = -EFAULT;
+                goto out;
+        }
+
         error = CLOCK_DISPATCH(which_clock, timer_create, (new_timer));
         if (error)
                 goto out;
diff --git a/kernel/power/block_io.c b/kernel/power/block_io.c
index 97024fd40cd5..83bbc7c02df9 100644
--- a/kernel/power/block_io.c
+++ b/kernel/power/block_io.c
@@ -28,7 +28,7 @@
 static int submit(int rw, struct block_device *bdev, sector_t sector,
                 struct page *page, struct bio **bio_chain)
 {
-        const int bio_rw = rw | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG);
+        const int bio_rw = rw | REQ_SYNC | REQ_UNPLUG;
         struct bio *bio;
 
         bio = bio_alloc(__GFP_WAIT | __GFP_HIGH, 1);
diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index aa9e916da4d5..c77963938bca 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -3,7 +3,7 @@
  *
  * Copyright (c) 2003 Patrick Mochel
  * Copyright (c) 2003 Open Source Development Lab
- * Copyright (c) 2004 Pavel Machek <pavel@suse.cz>
+ * Copyright (c) 2004 Pavel Machek <pavel@ucw.cz>
  * Copyright (c) 2009 Rafael J. Wysocki, Novell Inc.
  *
  * This file is released under the GPLv2.
@@ -277,7 +277,7 @@ static int create_image(int platform_mode)
                 goto Enable_irqs;
         }
 
-        if (hibernation_test(TEST_CORE))
+        if (hibernation_test(TEST_CORE) || !pm_check_wakeup_events())
                 goto Power_up;
 
         in_suspend = 1;
@@ -288,8 +288,10 @@ static int create_image(int platform_mode)
                         error);
         /* Restore control flow magically appears here */
         restore_processor_state();
-        if (!in_suspend)
+        if (!in_suspend) {
+                events_check_enabled = false;
                 platform_leave(platform_mode);
+        }
 
  Power_up:
         sysdev_resume();
@@ -328,7 +330,7 @@ int hibernation_snapshot(int platform_mode)
 
         error = platform_begin(platform_mode);
         if (error)
-                return error;
+                goto Close;
 
         /* Preallocate image memory before shutting down devices. */
         error = hibernate_preallocate_memory();
@@ -336,6 +338,7 @@ int hibernation_snapshot(int platform_mode)
                 goto Close;
 
         suspend_console();
+        hibernation_freeze_swap();
         saved_mask = clear_gfp_allowed_mask(GFP_IOFS);
         error = dpm_suspend_start(PMSG_FREEZE);
         if (error)
@@ -511,18 +514,24 @@ int hibernation_platform_enter(void)
 
         local_irq_disable();
         sysdev_suspend(PMSG_HIBERNATE);
+        if (!pm_check_wakeup_events()) {
+                error = -EAGAIN;
+                goto Power_up;
+        }
+
         hibernation_ops->enter();
         /* We should never get here */
         while (1);
 
-        /*
-         * We don't need to reenable the nonboot CPUs or resume consoles, since
-         * the system is going to be halted anyway.
-         */
+ Power_up:
+        sysdev_resume();
+        local_irq_enable();
+        enable_nonboot_cpus();
+
  Platform_finish:
         hibernation_ops->finish();
 
-        dpm_suspend_noirq(PMSG_RESTORE);
+        dpm_resume_noirq(PMSG_RESTORE);
 
  Resume_devices:
         entering_platform_hibernation = false;
diff --git a/kernel/power/main.c b/kernel/power/main.c
index b58800b21fc0..62b0bc6e4983 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -204,6 +204,60 @@ static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr,
 
 power_attr(state);
 
+#ifdef CONFIG_PM_SLEEP
+/*
+ * The 'wakeup_count' attribute, along with the functions defined in
+ * drivers/base/power/wakeup.c, provides a means by which wakeup events can be
+ * handled in a non-racy way.
+ *
+ * If a wakeup event occurs when the system is in a sleep state, it simply is
+ * woken up.  In turn, if an event that would wake the system up from a sleep
+ * state occurs when it is undergoing a transition to that sleep state, the
+ * transition should be aborted.  Moreover, if such an event occurs when the
+ * system is in the working state, an attempt to start a transition to the
+ * given sleep state should fail during certain period after the detection of
+ * the event.  Using the 'state' attribute alone is not sufficient to satisfy
+ * these requirements, because a wakeup event may occur exactly when 'state'
+ * is being written to and may be delivered to user space right before it is
+ * frozen, so the event will remain only partially processed until the system is
+ * woken up by another event.  In particular, it won't cause the transition to
+ * a sleep state to be aborted.
+ *
+ * This difficulty may be overcome if user space uses 'wakeup_count' before
+ * writing to 'state'.  It first should read from 'wakeup_count' and store
+ * the read value.  Then, after carrying out its own preparations for the system
+ * transition to a sleep state, it should write the stored value to
+ * 'wakeup_count'.  If that fails, at least one wakeup event has occured since
+ * 'wakeup_count' was read and 'state' should not be written to.  Otherwise, it
+ * is allowed to write to 'state', but the transition will be aborted if there
+ * are any wakeup events detected after 'wakeup_count' was written to.
+ */
+
+static ssize_t wakeup_count_show(struct kobject *kobj,
+                                struct kobj_attribute *attr,
+                                char *buf)
+{
+        unsigned long val;
+
+        return pm_get_wakeup_count(&val) ? sprintf(buf, "%lu\n", val) : -EINTR;
+}
+
+static ssize_t wakeup_count_store(struct kobject *kobj,
+                                struct kobj_attribute *attr,
+                                const char *buf, size_t n)
+{
+        unsigned long val;
+
+        if (sscanf(buf, "%lu", &val) == 1) {
+                if (pm_save_wakeup_count(val))
+                        return n;
+        }
+        return -EINVAL;
+}
+
+power_attr(wakeup_count);
+#endif /* CONFIG_PM_SLEEP */
+
 #ifdef CONFIG_PM_TRACE
 int pm_trace_enabled;
 
@@ -236,6 +290,7 @@ static struct attribute * g[] = {
 #endif
 #ifdef CONFIG_PM_SLEEP
         &pm_async_attr.attr,
+        &wakeup_count_attr.attr,
 #ifdef CONFIG_PM_DEBUG
         &pm_test_attr.attr,
 #endif
diff --git a/kernel/power/poweroff.c b/kernel/power/poweroff.c
index e8b337006276..d52359374e85 100644
--- a/kernel/power/poweroff.c
+++ b/kernel/power/poweroff.c
@@ -24,7 +24,7 @@ static void do_poweroff(struct work_struct *dummy)
 
 static DECLARE_WORK(poweroff_work, do_poweroff);
 
-static void handle_poweroff(int key, struct tty_struct *tty)
+static void handle_poweroff(int key)
 {
         /* run sysrq poweroff on boot cpu */
         schedule_work_on(cpumask_first(cpu_online_mask), &poweroff_work);
diff --git a/kernel/power/process.c b/kernel/power/process.c
index 71ae29052ab6..028a99598f49 100644
--- a/kernel/power/process.c
+++ b/kernel/power/process.c
@@ -15,6 +15,7 @@
 #include <linux/syscalls.h>
 #include <linux/freezer.h>
 #include <linux/delay.h>
+#include <linux/workqueue.h>
 
 /* 
  * Timeout for stopping processes
@@ -35,6 +36,7 @@ static int try_to_freeze_tasks(bool sig_only)
         struct task_struct *g, *p;
         unsigned long end_time;
         unsigned int todo;
+        bool wq_busy = false;
         struct timeval start, end;
         u64 elapsed_csecs64;
         unsigned int elapsed_csecs;
@@ -42,6 +44,10 @@ static int try_to_freeze_tasks(bool sig_only)
         do_gettimeofday(&start);
 
         end_time = jiffies + TIMEOUT;
+
+        if (!sig_only)
+                freeze_workqueues_begin();
+
         while (true) {
                 todo = 0;
                 read_lock(&tasklist_lock);
@@ -63,6 +69,12 @@ static int try_to_freeze_tasks(bool sig_only)
                                 todo++;
                 } while_each_thread(g, p);
                 read_unlock(&tasklist_lock);
+
+                if (!sig_only) {
+                        wq_busy = freeze_workqueues_busy();
+                        todo += wq_busy;
+                }
+
                 if (!todo || time_after(jiffies, end_time))
                         break;
 
@@ -86,8 +98,12 @@ static int try_to_freeze_tasks(bool sig_only)
                  */
                 printk("\n");
                 printk(KERN_ERR "Freezing of tasks failed after %d.%02d seconds "
-                                "(%d tasks refusing to freeze):\n",
-                                elapsed_csecs / 100, elapsed_csecs % 100, todo);
+                       "(%d tasks refusing to freeze, wq_busy=%d):\n",
+                       elapsed_csecs / 100, elapsed_csecs % 100,
+                       todo - wq_busy, wq_busy);
+
+                thaw_workqueues();
+
                 read_lock(&tasklist_lock);
                 do_each_thread(g, p) {
                         task_lock(p);
@@ -157,6 +173,7 @@ void thaw_processes(void)
         oom_killer_enable();
 
         printk("Restarting tasks ... ");
+        thaw_workqueues();
         thaw_tasks(true);
         thaw_tasks(false);
         schedule();
diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index 25ce010e9f8b..5e7edfb05e66 100644
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -3,7 +3,7 @@
  *
  * This file provides system snapshot/restore functionality for swsusp.
  *
- * Copyright (C) 1998-2005 Pavel Machek <pavel@suse.cz>
+ * Copyright (C) 1998-2005 Pavel Machek <pavel@ucw.cz>
  * Copyright (C) 2006 Rafael J. Wysocki <rjw@sisk.pl>
  *
  * This file is released under the GPLv2.
@@ -1086,6 +1086,7 @@ void swsusp_free(void)
         buffer = NULL;
         alloc_normal = 0;
         alloc_highmem = 0;
+        hibernation_thaw_swap();
 }
 
 /* Helper functions used for the shrinking of memory. */
diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c
index f37cb7dd4402..7335952ee473 100644
--- a/kernel/power/suspend.c
+++ b/kernel/power/suspend.c
@@ -136,19 +136,19 @@ static int suspend_enter(suspend_state_t state)
         if (suspend_ops->prepare) {
                 error = suspend_ops->prepare();
                 if (error)
-                        return error;
+                        goto Platform_finish;
         }
 
         error = dpm_suspend_noirq(PMSG_SUSPEND);
         if (error) {
                 printk(KERN_ERR "PM: Some devices failed to power down\n");
-                goto Platfrom_finish;
+                goto Platform_finish;
         }
 
         if (suspend_ops->prepare_late) {
                 error = suspend_ops->prepare_late();
                 if (error)
-                        goto Power_up_devices;
+                        goto Platform_wake;
         }
 
         if (suspend_test(TEST_PLATFORM))
@@ -163,8 +163,10 @@ static int suspend_enter(suspend_state_t state)
 
         error = sysdev_suspend(PMSG_SUSPEND);
         if (!error) {
-                if (!suspend_test(TEST_CORE))
+                if (!suspend_test(TEST_CORE) && pm_check_wakeup_events()) {
                         error = suspend_ops->enter(state);
+                        events_check_enabled = false;
+                }
                 sysdev_resume();
         }
 
@@ -178,10 +180,9 @@ static int suspend_enter(suspend_state_t state)
         if (suspend_ops->wake)
                 suspend_ops->wake();
 
- Power_up_devices:
         dpm_resume_noirq(PMSG_RESUME);
 
- Platfrom_finish:
+ Platform_finish:
         if (suspend_ops->finish)
                 suspend_ops->finish();
 
diff --git a/kernel/power/swap.c b/kernel/power/swap.c
index b0bb21778391..5d0059eed3e4 100644
--- a/kernel/power/swap.c
+++ b/kernel/power/swap.c
@@ -4,7 +4,7 @@
  * This file provides functions for reading the suspend image from
  * and writing it to a swap partition.
  *
- * Copyright (C) 1998,2001-2005 Pavel Machek <pavel@suse.cz>
+ * Copyright (C) 1998,2001-2005 Pavel Machek <pavel@ucw.cz>
  * Copyright (C) 2006 Rafael J. Wysocki <rjw@sisk.pl>
  *
  * This file is released under the GPLv2.
@@ -32,7 +32,7 @@
 /*
  *      The swap map is a data structure used for keeping track of each page
  *      written to a swap partition.  It consists of many swap_map_page
- *      structures that contain each an array of MAP_PAGE_SIZE swap entries.
+ *      structures that contain each an array of MAP_PAGE_ENTRIES swap entries.
  *      These structures are stored on the swap and linked together with the
  *      help of the .next_swap member.
  *
@@ -136,10 +136,10 @@ sector_t alloc_swapdev_block(int swap)
 {
         unsigned long offset;
 
-        offset = swp_offset(get_swap_page_of_type(swap));
+        offset = swp_offset(get_swap_for_hibernation(swap));
         if (offset) {
                 if (swsusp_extents_insert(offset))
-                        swap_free(swp_entry(swap, offset));
+                        swap_free_for_hibernation(swp_entry(swap, offset));
                 else
                         return swapdev_block(swap, offset);
         }
@@ -148,7 +148,7 @@ sector_t alloc_swapdev_block(int swap)
 
 /**
  *      free_all_swap_pages - free swap pages allocated for saving image data.
- *      It also frees the extents used to register which swap entres had been
+ *      It also frees the extents used to register which swap entries had been
  *      allocated.
  */
 
@@ -163,7 +163,7 @@ void free_all_swap_pages(int swap)
                 ext = container_of(node, struct swsusp_extent, node);
                 rb_erase(node, &swsusp_extents);
                 for (offset = ext->start; offset <= ext->end; offset++)
-                        swap_free(swp_entry(swap, offset));
+                        swap_free_for_hibernation(swp_entry(swap, offset));
 
                 kfree(ext);
         }
diff --git a/kernel/printk.c b/kernel/printk.c
index 444b770c9595..8fe465ac008a 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -37,6 +37,8 @@
 #include <linux/ratelimit.h>
 #include <linux/kmsg_dump.h>
 #include <linux/syslog.h>
+#include <linux/cpu.h>
+#include <linux/notifier.h>
 
 #include <asm/uaccess.h>
 
@@ -985,6 +987,32 @@ void resume_console(void)
 }
 
 /**
+ * console_cpu_notify - print deferred console messages after CPU hotplug
+ * @self: notifier struct
+ * @action: CPU hotplug event
+ * @hcpu: unused
+ *
+ * If printk() is called from a CPU that is not online yet, the messages
+ * will be spooled but will not show up on the console.  This function is
+ * called when a new CPU comes online (or fails to come up), and ensures
+ * that any such output gets printed.
+ */
+static int __cpuinit console_cpu_notify(struct notifier_block *self,
+        unsigned long action, void *hcpu)
+{
+        switch (action) {
+        case CPU_ONLINE:
+        case CPU_DEAD:
+        case CPU_DYING:
+        case CPU_DOWN_FAILED:
+        case CPU_UP_CANCELED:
+                acquire_console_sem();
+                release_console_sem();
+        }
+        return NOTIFY_OK;
+}
+
+/**
  * acquire_console_sem - lock the console system for exclusive use.
  *
  * Acquires a semaphore which guarantees that the caller has
@@ -1371,7 +1399,7 @@ int unregister_console(struct console *console)
 }
 EXPORT_SYMBOL(unregister_console);
 
-static int __init disable_boot_consoles(void)
+static int __init printk_late_init(void)
 {
         struct console *con;
 
@@ -1382,9 +1410,10 @@ static int __init disable_boot_consoles(void)
                         unregister_console(con);
                 }
         }
+        hotcpu_notifier(console_cpu_notify, 0);
         return 0;
 }
-late_initcall(disable_boot_consoles);
+late_initcall(printk_late_init);
 
 #if defined CONFIG_PRINTK
 
@@ -1520,9 +1549,9 @@ void kmsg_dump(enum kmsg_dump_reason reason)
         chars = logged_chars;
         spin_unlock_irqrestore(&logbuf_lock, flags);
 
-        if (logged_chars > end) {
-                s1 = log_buf + log_buf_len - logged_chars + end;
-                l1 = logged_chars - end;
+        if (chars > end) {
+                s1 = log_buf + log_buf_len - chars + end;
+                l1 = chars - end;
 
                 s2 = log_buf;
                 l2 = end;
@@ -1530,8 +1559,8 @@ void kmsg_dump(enum kmsg_dump_reason reason)
                 s1 = "";
                 l1 = 0;
 
-                s2 = log_buf + end - logged_chars;
-                l2 = logged_chars;
+                s2 = log_buf + end - chars;
+                l2 = chars;
         }
 
         if (!spin_trylock_irqsave(&dump_list_lock, flags)) {
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 74a3d693c196..f34d798ef4a2 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -324,26 +324,32 @@ int ptrace_detach(struct task_struct *child, unsigned int data)
 }
 
 /*
- * Detach all tasks we were using ptrace on.
+ * Detach all tasks we were using ptrace on. Called with tasklist held
+ * for writing, and returns with it held too. But note it can release
+ * and reacquire the lock.
  */
 void exit_ptrace(struct task_struct *tracer)
 {
         struct task_struct *p, *n;
         LIST_HEAD(ptrace_dead);
 
-        write_lock_irq(&tasklist_lock);
+        if (likely(list_empty(&tracer->ptraced)))
+                return;
+
         list_for_each_entry_safe(p, n, &tracer->ptraced, ptrace_entry) {
                 if (__ptrace_detach(tracer, p))
                         list_add(&p->ptrace_entry, &ptrace_dead);
         }
-        write_unlock_irq(&tasklist_lock);
 
+        write_unlock_irq(&tasklist_lock);
         BUG_ON(!list_empty(&tracer->ptraced));
 
         list_for_each_entry_safe(p, n, &ptrace_dead, ptrace_entry) {
                 list_del_init(&p->ptrace_entry);
                 release_task(p);
         }
+
+        write_lock_irq(&tasklist_lock);
 }
 
 int ptrace_readdata(struct task_struct *tsk, unsigned long src, char __user *dst, int len)
diff --git a/kernel/range.c b/kernel/range.c
index 74e2e6114927..471b66acabb5 100644
--- a/kernel/range.c
+++ b/kernel/range.c
@@ -7,10 +7,6 @@
 
 #include <linux/range.h>
 
-#ifndef ARRAY_SIZE
-#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
-#endif
-
 int add_range(struct range *range, int az, int nr_range, u64 start, u64 end)
 {
         if (start >= end)
diff --git a/kernel/rcupdate.c b/kernel/rcupdate.c
index 72a8dc9567f5..4d169835fb36 100644
--- a/kernel/rcupdate.c
+++ b/kernel/rcupdate.c
@@ -114,3 +114,163 @@ int rcu_my_thread_group_empty(void)
 }
 EXPORT_SYMBOL_GPL(rcu_my_thread_group_empty);
 #endif /* #ifdef CONFIG_PROVE_RCU */
+
+#ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD
+static inline void debug_init_rcu_head(struct rcu_head *head)
+{
+        debug_object_init(head, &rcuhead_debug_descr);
+}
+
+static inline void debug_rcu_head_free(struct rcu_head *head)
+{
+        debug_object_free(head, &rcuhead_debug_descr);
+}
+
+/*
+ * fixup_init is called when:
+ * - an active object is initialized
+ */
+static int rcuhead_fixup_init(void *addr, enum debug_obj_state state)
+{
+        struct rcu_head *head = addr;
+
+        switch (state) {
+        case ODEBUG_STATE_ACTIVE:
+                /*
+                 * Ensure that queued callbacks are all executed.
+                 * If we detect that we are nested in a RCU read-side critical
+                 * section, we should simply fail, otherwise we would deadlock.
+                 */
+                if (rcu_preempt_depth() != 0 || preempt_count() != 0 ||
+                    irqs_disabled()) {
+                        WARN_ON(1);
+                        return 0;
+                }
+                rcu_barrier();
+                rcu_barrier_sched();
+                rcu_barrier_bh();
+                debug_object_init(head, &rcuhead_debug_descr);
+                return 1;
+        default:
+                return 0;
+        }
+}
+
+/*
+ * fixup_activate is called when:
+ * - an active object is activated
+ * - an unknown object is activated (might be a statically initialized object)
+ * Activation is performed internally by call_rcu().
+ */
+static int rcuhead_fixup_activate(void *addr, enum debug_obj_state state)
+{
+        struct rcu_head *head = addr;
+
+        switch (state) {
+
+        case ODEBUG_STATE_NOTAVAILABLE:
+                /*
+                 * This is not really a fixup. We just make sure that it is
+                 * tracked in the object tracker.
+                 */
+                debug_object_init(head, &rcuhead_debug_descr);
+                debug_object_activate(head, &rcuhead_debug_descr);
+                return 0;
+
+        case ODEBUG_STATE_ACTIVE:
+                /*
+                 * Ensure that queued callbacks are all executed.
+                 * If we detect that we are nested in a RCU read-side critical
+                 * section, we should simply fail, otherwise we would deadlock.
+                 */
+                if (rcu_preempt_depth() != 0 || preempt_count() != 0 ||
+                    irqs_disabled()) {
+                        WARN_ON(1);
+                        return 0;
+                }
+                rcu_barrier();
+                rcu_barrier_sched();
+                rcu_barrier_bh();
+                debug_object_activate(head, &rcuhead_debug_descr);
+                return 1;
+        default:
+                return 0;
+        }
+}
+
+/*
+ * fixup_free is called when:
+ * - an active object is freed
+ */
+static int rcuhead_fixup_free(void *addr, enum debug_obj_state state)
+{
+        struct rcu_head *head = addr;
+
+        switch (state) {
+        case ODEBUG_STATE_ACTIVE:
+                /*
+                 * Ensure that queued callbacks are all executed.
+                 * If we detect that we are nested in a RCU read-side critical
+                 * section, we should simply fail, otherwise we would deadlock.
+                 */
+#ifndef CONFIG_PREEMPT
+                WARN_ON(1);
+                return 0;
+#else
+                if (rcu_preempt_depth() != 0 || preempt_count() != 0 ||
+                    irqs_disabled()) {
+                        WARN_ON(1);
+                        return 0;
+                }
+                rcu_barrier();
+                rcu_barrier_sched();
+                rcu_barrier_bh();
+                debug_object_free(head, &rcuhead_debug_descr);
+                return 1;
+#endif
+        default:
+                return 0;
+        }
+}
+
+/**
+ * init_rcu_head_on_stack() - initialize on-stack rcu_head for debugobjects
+ * @head: pointer to rcu_head structure to be initialized
+ *
+ * This function informs debugobjects of a new rcu_head structure that
+ * has been allocated as an auto variable on the stack.  This function
+ * is not required for rcu_head structures that are statically defined or
+ * that are dynamically allocated on the heap.  This function has no
+ * effect for !CONFIG_DEBUG_OBJECTS_RCU_HEAD kernel builds.
+ */
+void init_rcu_head_on_stack(struct rcu_head *head)
+{
+        debug_object_init_on_stack(head, &rcuhead_debug_descr);
+}
+EXPORT_SYMBOL_GPL(init_rcu_head_on_stack);
+
+/**
+ * destroy_rcu_head_on_stack() - destroy on-stack rcu_head for debugobjects
+ * @head: pointer to rcu_head structure to be initialized
+ *
+ * This function informs debugobjects that an on-stack rcu_head structure
+ * is about to go out of scope.  As with init_rcu_head_on_stack(), this
+ * function is not required for rcu_head structures that are statically
+ * defined or that are dynamically allocated on the heap.  Also as with
+ * init_rcu_head_on_stack(), this function has no effect for
+ * !CONFIG_DEBUG_OBJECTS_RCU_HEAD kernel builds.
+ */
+void destroy_rcu_head_on_stack(struct rcu_head *head)
+{
+        debug_object_free(head, &rcuhead_debug_descr);
+}
+EXPORT_SYMBOL_GPL(destroy_rcu_head_on_stack);
+
+struct debug_obj_descr rcuhead_debug_descr = {
+        .name = "rcu_head",
+        .fixup_init = rcuhead_fixup_init,
+        .fixup_activate = rcuhead_fixup_activate,
+        .fixup_free = rcuhead_fixup_free,
+};
+EXPORT_SYMBOL_GPL(rcuhead_debug_descr);
+#endif /* #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD */
diff --git a/kernel/rcutiny.c b/kernel/rcutiny.c
index 38729d3cd236..196ec02f8be0 100644
--- a/kernel/rcutiny.c
+++ b/kernel/rcutiny.c
@@ -169,6 +169,7 @@ static void __rcu_process_callbacks(struct rcu_ctrlblk *rcp)
         while (list) {
                 next = list->next;
                 prefetch(next);
+                debug_rcu_head_unqueue(list);
                 list->func(list);
                 list = next;
         }
@@ -211,6 +212,7 @@ static void __call_rcu(struct rcu_head *head,
 {
         unsigned long flags;
 
+        debug_rcu_head_queue(head);
         head->func = func;
         head->next = NULL;
 
diff --git a/kernel/rcutorture.c b/kernel/rcutorture.c
index 6535ac8bc6a5..2e2726d790b9 100644
--- a/kernel/rcutorture.c
+++ b/kernel/rcutorture.c
@@ -239,8 +239,7 @@ static unsigned long
 rcu_random(struct rcu_random_state *rrsp)
 {
         if (--rrsp->rrs_count < 0) {
-                rrsp->rrs_state +=
-                        (unsigned long)cpu_clock(raw_smp_processor_id());
+                rrsp->rrs_state += (unsigned long)local_clock();
                 rrsp->rrs_count = RCU_RANDOM_REFRESH;
         }
         rrsp->rrs_state = rrsp->rrs_state * RCU_RANDOM_MULT + RCU_RANDOM_ADD;
diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index d4437345706f..d5bc43976c5a 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -1112,6 +1112,7 @@ static void rcu_do_batch(struct rcu_state *rsp, struct rcu_data *rdp)
         while (list) {
                 next = list->next;
                 prefetch(next);
+                debug_rcu_head_unqueue(list);
                 list->func(list);
                 list = next;
                 if (++count >= rdp->blimit)
@@ -1388,6 +1389,7 @@ __call_rcu(struct rcu_head *head, void (*func)(struct rcu_head *rcu),
         unsigned long flags;
         struct rcu_data *rdp;
 
+        debug_rcu_head_queue(head);
         head->func = func;
         head->next = NULL;
 
diff --git a/kernel/sched.c b/kernel/sched.c
index f52a8801b7a2..09b574e7f4df 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -77,6 +77,7 @@
 #include <asm/irq_regs.h>
 
 #include "sched_cpupri.h"
+#include "workqueue_sched.h"
 
 #define CREATE_TRACE_POINTS
 #include <trace/events/sched.h>
@@ -456,9 +457,10 @@ struct rq {
         unsigned long nr_running;
         #define CPU_LOAD_IDX_MAX 5
         unsigned long cpu_load[CPU_LOAD_IDX_MAX];
+        unsigned long last_load_update_tick;
 #ifdef CONFIG_NO_HZ
         u64 nohz_stamp;
-        unsigned char in_nohz_recently;
+        unsigned char nohz_balance_kick;
 #endif
         unsigned int skip_clock_update;
 
@@ -1193,6 +1195,27 @@ static void resched_cpu(int cpu)
 
 #ifdef CONFIG_NO_HZ
 /*
+ * In the semi idle case, use the nearest busy cpu for migrating timers
+ * from an idle cpu.  This is good for power-savings.
+ *
+ * We don't do similar optimization for completely idle system, as
+ * selecting an idle cpu will add more delays to the timers than intended
+ * (as that cpu's timer base may not be uptodate wrt jiffies etc).
+ */
+int get_nohz_timer_target(void)
+{
+        int cpu = smp_processor_id();
+        int i;
+        struct sched_domain *sd;
+
+        for_each_domain(cpu, sd) {
+                for_each_cpu(i, sched_domain_span(sd))
+                        if (!idle_cpu(i))
+                                return i;
+        }
+        return cpu;
+}
+/*
  * When add_timer_on() enqueues a timer into the timer wheel of an
  * idle CPU then this timer might expire before the next timer event
  * which is scheduled to wake up that CPU. In case of a completely
@@ -1232,16 +1255,6 @@ void wake_up_idle_cpu(int cpu)
                 smp_send_reschedule(cpu);
 }
 
-int nohz_ratelimit(int cpu)
-{
-        struct rq *rq = cpu_rq(cpu);
-        u64 diff = rq->clock - rq->nohz_stamp;
-
-        rq->nohz_stamp = rq->clock;
-
-        return diff < (NSEC_PER_SEC / HZ) >> 1;
-}
-
 #endif /* CONFIG_NO_HZ */
 
 static u64 sched_avg_period(void)
@@ -1652,7 +1665,7 @@ static void update_shares(struct sched_domain *sd)
         if (root_task_group_empty())
                 return;
 
-        now = cpu_clock(raw_smp_processor_id());
+        now = local_clock();
         elapsed = now - sd->last_update;
 
         if (elapsed >= (s64)(u64)sysctl_sched_shares_ratelimit) {
@@ -1805,6 +1818,7 @@ static void cfs_rq_set_shares(struct cfs_rq *cfs_rq, unsigned long shares)
 static void calc_load_account_idle(struct rq *this_rq);
 static void update_sysctl(void);
 static int get_update_sysctl_factor(void);
+static void update_cpu_load(struct rq *this_rq);
 
 static inline void __set_task_cpu(struct task_struct *p, unsigned int cpu)
 {
@@ -2267,11 +2281,55 @@ static void update_avg(u64 *avg, u64 sample)
 }
 #endif
 
-/***
+static inline void ttwu_activate(struct task_struct *p, struct rq *rq,
+                                 bool is_sync, bool is_migrate, bool is_local,
+                                 unsigned long en_flags)
+{
+        schedstat_inc(p, se.statistics.nr_wakeups);
+        if (is_sync)
+                schedstat_inc(p, se.statistics.nr_wakeups_sync);
+        if (is_migrate)
+                schedstat_inc(p, se.statistics.nr_wakeups_migrate);
+        if (is_local)
+                schedstat_inc(p, se.statistics.nr_wakeups_local);
+        else
+                schedstat_inc(p, se.statistics.nr_wakeups_remote);
+
+        activate_task(rq, p, en_flags);
+}
+
+static inline void ttwu_post_activation(struct task_struct *p, struct rq *rq,
+                                        int wake_flags, bool success)
+{
+        trace_sched_wakeup(p, success);
+        check_preempt_curr(rq, p, wake_flags);
+
+        p->state = TASK_RUNNING;
+#ifdef CONFIG_SMP
+        if (p->sched_class->task_woken)
+                p->sched_class->task_woken(rq, p);
+
+        if (unlikely(rq->idle_stamp)) {
+                u64 delta = rq->clock - rq->idle_stamp;
+                u64 max = 2*sysctl_sched_migration_cost;
+
+                if (delta > max)
+                        rq->avg_idle = max;
+                else
+                        update_avg(&rq->avg_idle, delta);
+                rq->idle_stamp = 0;
+        }
+#endif
+        /* if a worker is waking up, notify workqueue */
+        if ((p->flags & PF_WQ_WORKER) && success)
+                wq_worker_waking_up(p, cpu_of(rq));
+}
+
+/**
  * try_to_wake_up - wake up a thread
- * @p: the to-be-woken-up thread
+ * @p: the thread to be awakened
  * @state: the mask of task states that can be woken
- * @sync: do a synchronous wakeup?
+ * @wake_flags: wake modifier flags (WF_*)
  *
  * Put it on the run-queue if it's not already there. The "current"
  * thread is always on the run-queue (except when the actual
@@ -2279,7 +2337,8 @@ static void update_avg(u64 *avg, u64 sample)
  * the simpler "current->state = TASK_RUNNING" to mark yourself
  * runnable without the overhead of this.
  *
- * returns failure only if the task is already active.
+ * Returns %true if @p was woken up, %false if it was already running
+ * or @state didn't match @p's state.
  */
 static int try_to_wake_up(struct task_struct *p, unsigned int state,
                           int wake_flags)
@@ -2359,38 +2418,11 @@ static int try_to_wake_up(struct task_struct *p, unsigned int state,
 
 out_activate:
 #endif /* CONFIG_SMP */
-        schedstat_inc(p, se.statistics.nr_wakeups);
-        if (wake_flags & WF_SYNC)
-                schedstat_inc(p, se.statistics.nr_wakeups_sync);
-        if (orig_cpu != cpu)
-                schedstat_inc(p, se.statistics.nr_wakeups_migrate);
-        if (cpu == this_cpu)
-                schedstat_inc(p, se.statistics.nr_wakeups_local);
-        else
-                schedstat_inc(p, se.statistics.nr_wakeups_remote);
-        activate_task(rq, p, en_flags);
+        ttwu_activate(p, rq, wake_flags & WF_SYNC, orig_cpu != cpu,
+                      cpu == this_cpu, en_flags);
         success = 1;
-
 out_running:
-        trace_sched_wakeup(p, success);
-        check_preempt_curr(rq, p, wake_flags);
-
-        p->state = TASK_RUNNING;
-#ifdef CONFIG_SMP
-        if (p->sched_class->task_woken)
-                p->sched_class->task_woken(rq, p);
-
-        if (unlikely(rq->idle_stamp)) {
-                u64 delta = rq->clock - rq->idle_stamp;
-                u64 max = 2*sysctl_sched_migration_cost;
-
-                if (delta > max)
-                        rq->avg_idle = max;
-                else
-                        update_avg(&rq->avg_idle, delta);
-                rq->idle_stamp = 0;
-        }
-#endif
+        ttwu_post_activation(p, rq, wake_flags, success);
 out:
         task_rq_unlock(rq, &flags);
         put_cpu();
@@ -2399,6 +2431,37 @@ out:
 }
 
 /**
+ * try_to_wake_up_local - try to wake up a local task with rq lock held
+ * @p: the thread to be awakened
+ *
+ * Put @p on the run-queue if it's not alredy there.  The caller must
+ * ensure that this_rq() is locked, @p is bound to this_rq() and not
+ * the current task.  this_rq() stays locked over invocation.
+ */
+static void try_to_wake_up_local(struct task_struct *p)
+{
+        struct rq *rq = task_rq(p);
+        bool success = false;
+
+        BUG_ON(rq != this_rq());
+        BUG_ON(p == current);
+        lockdep_assert_held(&rq->lock);
+
+        if (!(p->state & TASK_NORMAL))
+                return;
+
+        if (!p->se.on_rq) {
+                if (likely(!task_running(rq, p))) {
+                        schedstat_inc(rq, ttwu_count);
+                        schedstat_inc(rq, ttwu_local);
+                }
+                ttwu_activate(p, rq, false, false, true, ENQUEUE_WAKEUP);
+                success = true;
+        }
+        ttwu_post_activation(p, rq, 0, success);
+}
+
+/**
  * wake_up_process - Wake up a specific process
  * @p: The process to be woken up.
  *
@@ -3012,23 +3075,102 @@ static void calc_load_account_active(struct rq *this_rq)
 }
 
 /*
+ * The exact cpuload at various idx values, calculated at every tick would be
+ * load = (2^idx - 1) / 2^idx * load + 1 / 2^idx * cur_load
+ *
+ * If a cpu misses updates for n-1 ticks (as it was idle) and update gets called
+ * on nth tick when cpu may be busy, then we have:
+ * load = ((2^idx - 1) / 2^idx)^(n-1) * load
+ * load = (2^idx - 1) / 2^idx) * load + 1 / 2^idx * cur_load
+ *
+ * decay_load_missed() below does efficient calculation of
+ * load = ((2^idx - 1) / 2^idx)^(n-1) * load
+ * avoiding 0..n-1 loop doing load = ((2^idx - 1) / 2^idx) * load
+ *
+ * The calculation is approximated on a 128 point scale.
+ * degrade_zero_ticks is the number of ticks after which load at any
+ * particular idx is approximated to be zero.
+ * degrade_factor is a precomputed table, a row for each load idx.
+ * Each column corresponds to degradation factor for a power of two ticks,
+ * based on 128 point scale.
+ * Example:
+ * row 2, col 3 (=12) says that the degradation at load idx 2 after
+ * 8 ticks is 12/128 (which is an approximation of exact factor 3^8/4^8).
+ *
+ * With this power of 2 load factors, we can degrade the load n times
+ * by looking at 1 bits in n and doing as many mult/shift instead of
+ * n mult/shifts needed by the exact degradation.
+ */
+#define DEGRADE_SHIFT           7
+static const unsigned char
+                degrade_zero_ticks[CPU_LOAD_IDX_MAX] = {0, 8, 32, 64, 128};
+static const unsigned char
+                degrade_factor[CPU_LOAD_IDX_MAX][DEGRADE_SHIFT + 1] = {
+                                        {0, 0, 0, 0, 0, 0, 0, 0},
+                                        {64, 32, 8, 0, 0, 0, 0, 0},
+                                        {96, 72, 40, 12, 1, 0, 0},
+                                        {112, 98, 75, 43, 15, 1, 0},
+                                        {120, 112, 98, 76, 45, 16, 2} };
+
+/*
+ * Update cpu_load for any missed ticks, due to tickless idle. The backlog
+ * would be when CPU is idle and so we just decay the old load without
+ * adding any new load.
+ */
+static unsigned long
+decay_load_missed(unsigned long load, unsigned long missed_updates, int idx)
+{
+        int j = 0;
+
+        if (!missed_updates)
+                return load;
+
+        if (missed_updates >= degrade_zero_ticks[idx])
+                return 0;
+
+        if (idx == 1)
+                return load >> missed_updates;
+
+        while (missed_updates) {
+                if (missed_updates % 2)
+                        load = (load * degrade_factor[idx][j]) >> DEGRADE_SHIFT;
+
+                missed_updates >>= 1;
+                j++;
+        }
+        return load;
+}
+
+/*
  * Update rq->cpu_load[] statistics. This function is usually called every
- * scheduler tick (TICK_NSEC).
+ * scheduler tick (TICK_NSEC). With tickless idle this will not be called
+ * every tick. We fix it up based on jiffies.
  */
 static void update_cpu_load(struct rq *this_rq)
 {
         unsigned long this_load = this_rq->load.weight;
+        unsigned long curr_jiffies = jiffies;
+        unsigned long pending_updates;
         int i, scale;
 
         this_rq->nr_load_updates++;
 
+        /* Avoid repeated calls on same jiffy, when moving in and out of idle */
+        if (curr_jiffies == this_rq->last_load_update_tick)
+                return;
+
+        pending_updates = curr_jiffies - this_rq->last_load_update_tick;
+        this_rq->last_load_update_tick = curr_jiffies;
+
         /* Update our load: */
-        for (i = 0, scale = 1; i < CPU_LOAD_IDX_MAX; i++, scale += scale) {
+        this_rq->cpu_load[0] = this_load; /* Fasttrack for idx 0 */
+        for (i = 1, scale = 2; i < CPU_LOAD_IDX_MAX; i++, scale += scale) {
                 unsigned long old_load, new_load;
 
                 /* scale is effectively 1 << i now, and >> i divides by scale */
 
                 old_load = this_rq->cpu_load[i];
+                old_load = decay_load_missed(old_load, pending_updates - 1, i);
                 new_load = this_load;
                 /*
                  * Round up the averaging division if load is increasing. This
@@ -3036,9 +3178,15 @@ static void update_cpu_load(struct rq *this_rq)
                  * example.
                  */
                 if (new_load > old_load)
-                        new_load += scale-1;
-                this_rq->cpu_load[i] = (old_load*(scale-1) + new_load) >> i;
+                        new_load += scale - 1;
+
+                this_rq->cpu_load[i] = (old_load * (scale - 1) + new_load) >> i;
         }
+}
+
+static void update_cpu_load_active(struct rq *this_rq)
+{
+        update_cpu_load(this_rq);
 
         calc_load_account_active(this_rq);
 }
@@ -3426,7 +3574,7 @@ void scheduler_tick(void)
 
         raw_spin_lock(&rq->lock);
         update_rq_clock(rq);
-        update_cpu_load(rq);
+        update_cpu_load_active(rq);
         curr->sched_class->task_tick(rq, curr, 0);
         raw_spin_unlock(&rq->lock);
 
@@ -3598,7 +3746,6 @@ need_resched:
         rq = cpu_rq(cpu);
         rcu_note_context_switch(cpu);
         prev = rq->curr;
-        switch_count = &prev->nivcsw;
 
         release_kernel_lock(prev);
 need_resched_nonpreemptible:
@@ -3611,11 +3758,26 @@ need_resched_nonpreemptible:
         raw_spin_lock_irq(&rq->lock);
         clear_tsk_need_resched(prev);
 
+        switch_count = &prev->nivcsw;
         if (prev->state && !(preempt_count() & PREEMPT_ACTIVE)) {
-                if (unlikely(signal_pending_state(prev->state, prev)))
+                if (unlikely(signal_pending_state(prev->state, prev))) {
                         prev->state = TASK_RUNNING;
-                else
+                } else {
+                        /*
+                         * If a worker is going to sleep, notify and
+                         * ask workqueue whether it wants to wake up a
+                         * task to maintain concurrency.  If so, wake
+                         * up the task.
+                         */
+                        if (prev->flags & PF_WQ_WORKER) {
+                                struct task_struct *to_wakeup;
+
+                                to_wakeup = wq_worker_sleeping(prev, cpu);
+                                if (to_wakeup)
+                                        try_to_wake_up_local(to_wakeup);
+                        }
                         deactivate_task(rq, prev, DEQUEUE_SLEEP);
+                }
                 switch_count = &prev->nvcsw;
         }
 
@@ -3637,8 +3799,10 @@ need_resched_nonpreemptible:
 
                 context_switch(rq, prev, next); /* unlocks the rq */
                 /*
-                 * the context switch might have flipped the stack from under
-                 * us, hence refresh the local variables.
+                 * The context switch have flipped the stack from under us
+                 * and restored the local variables which were saved when
+                 * this task called schedule() in the past. prev == current
+                 * is still correct, but it can be moved to another cpu/rq.
                  */
                 cpu = smp_processor_id();
                 rq = cpu_rq(cpu);
@@ -3647,11 +3811,8 @@ need_resched_nonpreemptible:
 
         post_schedule(rq);
 
-        if (unlikely(reacquire_kernel_lock(current) < 0)) {
-                prev = rq->curr;
-                switch_count = &prev->nivcsw;
+        if (unlikely(reacquire_kernel_lock(prev)))
                 goto need_resched_nonpreemptible;
-        }
 
         preempt_enable_no_resched();
         if (need_resched())
@@ -3704,8 +3865,16 @@ int mutex_spin_on_owner(struct mutex *lock, struct thread_info *owner)
                 /*
                  * Owner changed, break to re-assess state.
                  */
-                if (lock->owner != owner)
+                if (lock->owner != owner) {
+                        /*
+                         * If the lock has switched to a different owner,
+                         * we likely have heavy contention. Return 0 to quit
+                         * optimistic spinning and not contend further:
+                         */
+                        if (lock->owner)
+                                return 0;
                         break;
+                }
 
                 /*
                  * Is that owner really running on that cpu?
@@ -3726,7 +3895,7 @@ int mutex_spin_on_owner(struct mutex *lock, struct thread_info *owner)
  * off of preempt_enable. Kernel preemptions off return from interrupt
  * occur there and call schedule directly.
  */
-asmlinkage void __sched preempt_schedule(void)
+asmlinkage void __sched notrace preempt_schedule(void)
 {
         struct thread_info *ti = current_thread_info();
 
@@ -3738,9 +3907,9 @@ asmlinkage void __sched preempt_schedule(void)
                 return;
 
         do {
-                add_preempt_count(PREEMPT_ACTIVE);
+                add_preempt_count_notrace(PREEMPT_ACTIVE);
                 schedule();
-                sub_preempt_count(PREEMPT_ACTIVE);
+                sub_preempt_count_notrace(PREEMPT_ACTIVE);
 
                 /*
                  * Check again in case we missed a preemption opportunity
@@ -4441,12 +4610,8 @@ recheck:
          */
         if (user && !capable(CAP_SYS_NICE)) {
                 if (rt_policy(policy)) {
-                        unsigned long rlim_rtprio;
-
-                        if (!lock_task_sighand(p, &flags))
-                                return -ESRCH;
-                        rlim_rtprio = task_rlimit(p, RLIMIT_RTPRIO);
-                        unlock_task_sighand(p, &flags);
+                        unsigned long rlim_rtprio =
+                                        task_rlimit(p, RLIMIT_RTPRIO);
 
                         /* can't set/change the rt policy */
                         if (policy != p->policy && !rlim_rtprio)
@@ -5816,20 +5981,49 @@ migration_call(struct notifier_block *nfb, unsigned long action, void *hcpu)
  */
 static struct notifier_block __cpuinitdata migration_notifier = {
         .notifier_call = migration_call,
-        .priority = 10
+        .priority = CPU_PRI_MIGRATION,
 };
 
+static int __cpuinit sched_cpu_active(struct notifier_block *nfb,
+                                      unsigned long action, void *hcpu)
+{
+        switch (action & ~CPU_TASKS_FROZEN) {
+        case CPU_ONLINE:
+        case CPU_DOWN_FAILED:
+                set_cpu_active((long)hcpu, true);
+                return NOTIFY_OK;
+        default:
+                return NOTIFY_DONE;
+        }
+}
+
+static int __cpuinit sched_cpu_inactive(struct notifier_block *nfb,
+                                        unsigned long action, void *hcpu)
+{
+        switch (action & ~CPU_TASKS_FROZEN) {
+        case CPU_DOWN_PREPARE:
+                set_cpu_active((long)hcpu, false);
+                return NOTIFY_OK;
+        default:
+                return NOTIFY_DONE;
+        }
+}
+
 static int __init migration_init(void)
 {
         void *cpu = (void *)(long)smp_processor_id();
         int err;
 
-        /* Start one for the boot CPU: */
+        /* Initialize migration for the boot CPU */
         err = migration_call(&migration_notifier, CPU_UP_PREPARE, cpu);
         BUG_ON(err == NOTIFY_BAD);
         migration_call(&migration_notifier, CPU_ONLINE, cpu);
         register_cpu_notifier(&migration_notifier);
 
+        /* Register cpu active notifiers */
+        cpu_notifier(sched_cpu_active, CPU_PRI_SCHED_ACTIVE);
+        cpu_notifier(sched_cpu_inactive, CPU_PRI_SCHED_INACTIVE);
+
         return 0;
 }
 early_initcall(migration_init);
@@ -6064,23 +6258,18 @@ static void rq_attach_root(struct rq *rq, struct root_domain *rd)
                 free_rootdomain(old_rd);
 }
 
-static int init_rootdomain(struct root_domain *rd, bool bootmem)
+static int init_rootdomain(struct root_domain *rd)
 {
-        gfp_t gfp = GFP_KERNEL;
-
         memset(rd, 0, sizeof(*rd));
 
-        if (bootmem)
-                gfp = GFP_NOWAIT;
-
-        if (!alloc_cpumask_var(&rd->span, gfp))
+        if (!alloc_cpumask_var(&rd->span, GFP_KERNEL))
                 goto out;
-        if (!alloc_cpumask_var(&rd->online, gfp))
+        if (!alloc_cpumask_var(&rd->online, GFP_KERNEL))
                 goto free_span;
-        if (!alloc_cpumask_var(&rd->rto_mask, gfp))
+        if (!alloc_cpumask_var(&rd->rto_mask, GFP_KERNEL))
                 goto free_online;
 
-        if (cpupri_init(&rd->cpupri, bootmem) != 0)
+        if (cpupri_init(&rd->cpupri) != 0)
                 goto free_rto_mask;
         return 0;
 
@@ -6096,7 +6285,7 @@ out:
 
 static void init_defrootdomain(void)
 {
-        init_rootdomain(&def_root_domain, true);
+        init_rootdomain(&def_root_domain);
 
         atomic_set(&def_root_domain.refcount, 1);
 }
@@ -6109,7 +6298,7 @@ static struct root_domain *alloc_rootdomain(void)
         if (!rd)
                 return NULL;
 
-        if (init_rootdomain(rd, false) != 0) {
+        if (init_rootdomain(rd) != 0) {
                 kfree(rd);
                 return NULL;
         }
@@ -7288,29 +7477,35 @@ int __init sched_create_sysfs_power_savings_entries(struct sysdev_class *cls)
 }
 #endif /* CONFIG_SCHED_MC || CONFIG_SCHED_SMT */
 
-#ifndef CONFIG_CPUSETS
 /*
- * Add online and remove offline CPUs from the scheduler domains.
- * When cpusets are enabled they take over this function.
+ * Update cpusets according to cpu_active mask.  If cpusets are
+ * disabled, cpuset_update_active_cpus() becomes a simple wrapper
+ * around partition_sched_domains().
  */
-static int update_sched_domains(struct notifier_block *nfb,
-                                unsigned long action, void *hcpu)
+static int cpuset_cpu_active(struct notifier_block *nfb, unsigned long action,
+                             void *hcpu)
 {
-        switch (action) {
+        switch (action & ~CPU_TASKS_FROZEN) {
         case CPU_ONLINE:
-        case CPU_ONLINE_FROZEN:
-        case CPU_DOWN_PREPARE:
-        case CPU_DOWN_PREPARE_FROZEN:
         case CPU_DOWN_FAILED:
-        case CPU_DOWN_FAILED_FROZEN:
-                partition_sched_domains(1, NULL, NULL);
+                cpuset_update_active_cpus();
                 return NOTIFY_OK;
+        default:
+                return NOTIFY_DONE;
+        }
+}
 
+static int cpuset_cpu_inactive(struct notifier_block *nfb, unsigned long action,
+                               void *hcpu)
+{
+        switch (action & ~CPU_TASKS_FROZEN) {
+        case CPU_DOWN_PREPARE:
+                cpuset_update_active_cpus();
+                return NOTIFY_OK;
         default:
                 return NOTIFY_DONE;
         }
 }
-#endif
 
 static int update_runtime(struct notifier_block *nfb,
                                 unsigned long action, void *hcpu)
@@ -7356,10 +7551,8 @@ void __init sched_init_smp(void)
         mutex_unlock(&sched_domains_mutex);
         put_online_cpus();
 
-#ifndef CONFIG_CPUSETS
-        /* XXX: Theoretical race here - CPU may be hotplugged now */
-        hotcpu_notifier(update_sched_domains, 0);
-#endif
+        hotcpu_notifier(cpuset_cpu_active, CPU_PRI_CPUSET_ACTIVE);
+        hotcpu_notifier(cpuset_cpu_inactive, CPU_PRI_CPUSET_INACTIVE);
 
         /* RT runtime code needs to handle some hotplug events */
         hotcpu_notifier(update_runtime, 0);
@@ -7604,6 +7797,9 @@ void __init sched_init(void)
 
                 for (j = 0; j < CPU_LOAD_IDX_MAX; j++)
                         rq->cpu_load[j] = 0;
+
+                rq->last_load_update_tick = jiffies;
+
 #ifdef CONFIG_SMP
                 rq->sd = NULL;
                 rq->rd = NULL;
@@ -7617,6 +7813,10 @@ void __init sched_init(void)
                 rq->idle_stamp = 0;
                 rq->avg_idle = 2*sysctl_sched_migration_cost;
                 rq_attach_root(rq, &def_root_domain);
+#ifdef CONFIG_NO_HZ
+                rq->nohz_balance_kick = 0;
+                init_sched_softirq_csd(&per_cpu(remote_sched_softirq_cb, i));
+#endif
 #endif
                 init_rq_hrtick(rq);
                 atomic_set(&rq->nr_iowait, 0);
@@ -7661,8 +7861,11 @@ void __init sched_init(void)
         zalloc_cpumask_var(&nohz_cpu_mask, GFP_NOWAIT);
 #ifdef CONFIG_SMP
 #ifdef CONFIG_NO_HZ
-        zalloc_cpumask_var(&nohz.cpu_mask, GFP_NOWAIT);
-        alloc_cpumask_var(&nohz.ilb_grp_nohz_mask, GFP_NOWAIT);
+        zalloc_cpumask_var(&nohz.idle_cpus_mask, GFP_NOWAIT);
+        alloc_cpumask_var(&nohz.grp_idle_mask, GFP_NOWAIT);
+        atomic_set(&nohz.load_balancer, nr_cpu_ids);
+        atomic_set(&nohz.first_pick_cpu, nr_cpu_ids);
+        atomic_set(&nohz.second_pick_cpu, nr_cpu_ids);
 #endif
         /* May be allocated at isolcpus cmdline parse time */
         if (cpu_isolated_map == NULL)
diff --git a/kernel/sched_clock.c b/kernel/sched_clock.c
index 906a0f718cb3..52f1a149bfb1 100644
--- a/kernel/sched_clock.c
+++ b/kernel/sched_clock.c
@@ -10,19 +10,55 @@
  *   Ingo Molnar <mingo@redhat.com>
  *   Guillaume Chazarain <guichaz@gmail.com>
  *
- * Create a semi stable clock from a mixture of other events, including:
- *  - gtod
+ *
+ * What:
+ *
+ * cpu_clock(i) provides a fast (execution time) high resolution
+ * clock with bounded drift between CPUs. The value of cpu_clock(i)
+ * is monotonic for constant i. The timestamp returned is in nanoseconds.
+ *
+ * ######################### BIG FAT WARNING ##########################
+ * # when comparing cpu_clock(i) to cpu_clock(j) for i != j, time can #
+ * # go backwards !!                                                  #
+ * ####################################################################
+ *
+ * There is no strict promise about the base, although it tends to start
+ * at 0 on boot (but people really shouldn't rely on that).
+ *
+ * cpu_clock(i)       -- can be used from any context, including NMI.
+ * sched_clock_cpu(i) -- must be used with local IRQs disabled (implied by NMI)
+ * local_clock()      -- is cpu_clock() on the current cpu.
+ *
+ * How:
+ *
+ * The implementation either uses sched_clock() when
+ * !CONFIG_HAVE_UNSTABLE_SCHED_CLOCK, which means in that case the
+ * sched_clock() is assumed to provide these properties (mostly it means
+ * the architecture provides a globally synchronized highres time source).
+ *
+ * Otherwise it tries to create a semi stable clock from a mixture of other
+ * clocks, including:
+ *
+ *  - GTOD (clock monotomic)
  *  - sched_clock()
  *  - explicit idle events
  *
- * We use gtod as base and the unstable clock deltas. The deltas are filtered,
- * making it monotonic and keeping it within an expected window.
+ * We use GTOD as base and use sched_clock() deltas to improve resolution. The
+ * deltas are filtered to provide monotonicity and keeping it within an
+ * expected window.
  *
  * Furthermore, explicit sleep and wakeup hooks allow us to account for time
  * that is otherwise invisible (TSC gets stopped).
  *
- * The clock: sched_clock_cpu() is monotonic per cpu, and should be somewhat
- * consistent between cpus (never more than 2 jiffies difference).
+ *
+ * Notes:
+ *
+ * The !IRQ-safetly of sched_clock() and sched_clock_cpu() comes from things
+ * like cpufreq interrupts that can change the base clock (TSC) multiplier
+ * and cause funny jumps in time -- although the filtering provided by
+ * sched_clock_cpu() should mitigate serious artifacts we cannot rely on it
+ * in general since for !CONFIG_HAVE_UNSTABLE_SCHED_CLOCK we fully rely on
+ * sched_clock().
  */
 #include <linux/spinlock.h>
 #include <linux/hardirq.h>
@@ -170,6 +206,11 @@ again:
         return val;
 }
 
+/*
+ * Similar to cpu_clock(), but requires local IRQs to be disabled.
+ *
+ * See cpu_clock().
+ */
 u64 sched_clock_cpu(int cpu)
 {
         struct sched_clock_data *scd;
@@ -237,9 +278,19 @@ void sched_clock_idle_wakeup_event(u64 delta_ns)
 }
 EXPORT_SYMBOL_GPL(sched_clock_idle_wakeup_event);
 
-unsigned long long cpu_clock(int cpu)
+/*
+ * As outlined at the top, provides a fast, high resolution, nanosecond
+ * time source that is monotonic per cpu argument and has bounded drift
+ * between cpus.
+ *
+ * ######################### BIG FAT WARNING ##########################
+ * # when comparing cpu_clock(i) to cpu_clock(j) for i != j, time can #
+ * # go backwards !!                                                  #
+ * ####################################################################
+ */
+u64 cpu_clock(int cpu)
 {
-        unsigned long long clock;
+        u64 clock;
         unsigned long flags;
 
         local_irq_save(flags);
@@ -249,6 +300,25 @@ unsigned long long cpu_clock(int cpu)
         return clock;
 }
 
+/*
+ * Similar to cpu_clock() for the current cpu. Time will only be observed
+ * to be monotonic if care is taken to only compare timestampt taken on the
+ * same CPU.
+ *
+ * See cpu_clock().
+ */
+u64 local_clock(void)
+{
+        u64 clock;
+        unsigned long flags;
+
+        local_irq_save(flags);
+        clock = sched_clock_cpu(smp_processor_id());
+        local_irq_restore(flags);
+
+        return clock;
+}
+
 #else /* CONFIG_HAVE_UNSTABLE_SCHED_CLOCK */
 
 void sched_clock_init(void)
@@ -264,12 +334,17 @@ u64 sched_clock_cpu(int cpu)
         return sched_clock();
 }
 
-
-unsigned long long cpu_clock(int cpu)
+u64 cpu_clock(int cpu)
 {
         return sched_clock_cpu(cpu);
 }
 
+u64 local_clock(void)
+{
+        return sched_clock_cpu(0);
+}
+
 #endif /* CONFIG_HAVE_UNSTABLE_SCHED_CLOCK */
 
 EXPORT_SYMBOL_GPL(cpu_clock);
+EXPORT_SYMBOL_GPL(local_clock);
diff --git a/kernel/sched_cpupri.c b/kernel/sched_cpupri.c
index e6871cb3fc83..2722dc1b4138 100644
--- a/kernel/sched_cpupri.c
+++ b/kernel/sched_cpupri.c
@@ -166,14 +166,10 @@ void cpupri_set(struct cpupri *cp, int cpu, int newpri)
  *
  * Returns: -ENOMEM if memory fails.
  */
-int cpupri_init(struct cpupri *cp, bool bootmem)
+int cpupri_init(struct cpupri *cp)
 {
-        gfp_t gfp = GFP_KERNEL;
         int i;
 
-        if (bootmem)
-                gfp = GFP_NOWAIT;
-
         memset(cp, 0, sizeof(*cp));
 
         for (i = 0; i < CPUPRI_NR_PRIORITIES; i++) {
@@ -181,7 +177,7 @@ int cpupri_init(struct cpupri *cp, bool bootmem)
 
                 raw_spin_lock_init(&vec->lock);
                 vec->count = 0;
-                if (!zalloc_cpumask_var(&vec->mask, gfp))
+                if (!zalloc_cpumask_var(&vec->mask, GFP_KERNEL))
                         goto cleanup;
         }
 
diff --git a/kernel/sched_cpupri.h b/kernel/sched_cpupri.h
index 7cb5bb6b95be..9fc7d386fea4 100644
--- a/kernel/sched_cpupri.h
+++ b/kernel/sched_cpupri.h
@@ -27,7 +27,7 @@ struct cpupri {
 int  cpupri_find(struct cpupri *cp,
                  struct task_struct *p, struct cpumask *lowest_mask);
 void cpupri_set(struct cpupri *cp, int cpu, int pri);
-int cpupri_init(struct cpupri *cp, bool bootmem);
+int cpupri_init(struct cpupri *cp);
 void cpupri_cleanup(struct cpupri *cp);
 #else
 #define cpupri_set(cp, cpu, pri) do { } while (0)
diff --git a/kernel/sched_debug.c b/kernel/sched_debug.c
index 35565395d00d..2e1b0d17dd9b 100644
--- a/kernel/sched_debug.c
+++ b/kernel/sched_debug.c
@@ -332,7 +332,7 @@ static int sched_debug_show(struct seq_file *m, void *v)
         PN(sysctl_sched_latency);
         PN(sysctl_sched_min_granularity);
         PN(sysctl_sched_wakeup_granularity);
-        PN(sysctl_sched_child_runs_first);
+        P(sysctl_sched_child_runs_first);
         P(sysctl_sched_features);
 #undef PN
 #undef P
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index a878b5332daa..ab661ebc4895 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -2287,13 +2287,6 @@ static void update_cpu_power(struct sched_domain *sd, int cpu)
         unsigned long power = SCHED_LOAD_SCALE;
         struct sched_group *sdg = sd->groups;
 
-        if (sched_feat(ARCH_POWER))
-                power *= arch_scale_freq_power(sd, cpu);
-        else
-                power *= default_scale_freq_power(sd, cpu);
-
-        power >>= SCHED_LOAD_SHIFT;
-
         if ((sd->flags & SD_SHARE_CPUPOWER) && weight > 1) {
                 if (sched_feat(ARCH_POWER))
                         power *= arch_scale_smt_power(sd, cpu);
@@ -2303,6 +2296,15 @@ static void update_cpu_power(struct sched_domain *sd, int cpu)
                 power >>= SCHED_LOAD_SHIFT;
         }
 
+        sdg->cpu_power_orig = power;
+
+        if (sched_feat(ARCH_POWER))
+                power *= arch_scale_freq_power(sd, cpu);
+        else
+                power *= default_scale_freq_power(sd, cpu);
+
+        power >>= SCHED_LOAD_SHIFT;
+
         power *= scale_rt_power(cpu);
         power >>= SCHED_LOAD_SHIFT;
 
@@ -2335,6 +2337,31 @@ static void update_group_power(struct sched_domain *sd, int cpu)
         sdg->cpu_power = power;
 }
 
+/*
+ * Try and fix up capacity for tiny siblings, this is needed when
+ * things like SD_ASYM_PACKING need f_b_g to select another sibling
+ * which on its own isn't powerful enough.
+ *
+ * See update_sd_pick_busiest() and check_asym_packing().
+ */
+static inline int
+fix_small_capacity(struct sched_domain *sd, struct sched_group *group)
+{
+        /*
+         * Only siblings can have significantly less than SCHED_LOAD_SCALE
+         */
+        if (sd->level != SD_LV_SIBLING)
+                return 0;
+
+        /*
+         * If ~90% of the cpu_power is still there, we're good.
+         */
+        if (group->cpu_power * 32 > group->cpu_power_orig * 29)
+                return 1;
+
+        return 0;
+}
+
 /**
  * update_sg_lb_stats - Update sched_group's statistics for load balancing.
  * @sd: The sched_domain whose statistics are to be updated.
@@ -2400,14 +2427,14 @@ static inline void update_sg_lb_stats(struct sched_domain *sd,
          * domains. In the newly idle case, we will allow all the cpu's
          * to do the newly idle load balance.
          */
-        if (idle != CPU_NEWLY_IDLE && local_group &&
-            balance_cpu != this_cpu) {
-                *balance = 0;
-                return;
+        if (idle != CPU_NEWLY_IDLE && local_group) {
+                if (balance_cpu != this_cpu) {
+                        *balance = 0;
+                        return;
+                }
+                update_group_power(sd, this_cpu);
         }
 
-        update_group_power(sd, this_cpu);
-
         /* Adjust by relative CPU power of the group */
         sgs->avg_load = (sgs->group_load * SCHED_LOAD_SCALE) / group->cpu_power;
 
@@ -2428,6 +2455,51 @@ static inline void update_sg_lb_stats(struct sched_domain *sd,
 
         sgs->group_capacity =
                 DIV_ROUND_CLOSEST(group->cpu_power, SCHED_LOAD_SCALE);
+        if (!sgs->group_capacity)
+                sgs->group_capacity = fix_small_capacity(sd, group);
+}
+
+/**
+ * update_sd_pick_busiest - return 1 on busiest group
+ * @sd: sched_domain whose statistics are to be checked
+ * @sds: sched_domain statistics
+ * @sg: sched_group candidate to be checked for being the busiest
+ * @sgs: sched_group statistics
+ * @this_cpu: the current cpu
+ *
+ * Determine if @sg is a busier group than the previously selected
+ * busiest group.
+ */
+static bool update_sd_pick_busiest(struct sched_domain *sd,
+                                   struct sd_lb_stats *sds,
+                                   struct sched_group *sg,
+                                   struct sg_lb_stats *sgs,
+                                   int this_cpu)
+{
+        if (sgs->avg_load <= sds->max_load)
+                return false;
+
+        if (sgs->sum_nr_running > sgs->group_capacity)
+                return true;
+
+        if (sgs->group_imb)
+                return true;
+
+        /*
+         * ASYM_PACKING needs to move all the work to the lowest
+         * numbered CPUs in the group, therefore mark all groups
+         * higher than ourself as busy.
+         */
+        if ((sd->flags & SD_ASYM_PACKING) && sgs->sum_nr_running &&
+            this_cpu < group_first_cpu(sg)) {
+                if (!sds->busiest)
+                        return true;
+
+                if (group_first_cpu(sds->busiest) > group_first_cpu(sg))
+                        return true;
+        }
+
+        return false;
 }
 
 /**
@@ -2435,7 +2507,7 @@ static inline void update_sg_lb_stats(struct sched_domain *sd,
  * @sd: sched_domain whose statistics are to be updated.
  * @this_cpu: Cpu for which load balance is currently performed.
  * @idle: Idle status of this_cpu
- * @sd_idle: Idle status of the sched_domain containing group.
+ * @sd_idle: Idle status of the sched_domain containing sg.
  * @cpus: Set of cpus considered for load balancing.
  * @balance: Should we balance.
  * @sds: variable to hold the statistics for this sched_domain.
@@ -2446,7 +2518,7 @@ static inline void update_sd_lb_stats(struct sched_domain *sd, int this_cpu,
                         struct sd_lb_stats *sds)
 {
         struct sched_domain *child = sd->child;
-        struct sched_group *group = sd->groups;
+        struct sched_group *sg = sd->groups;
         struct sg_lb_stats sgs;
         int load_idx, prefer_sibling = 0;
 
@@ -2459,21 +2531,20 @@ static inline void update_sd_lb_stats(struct sched_domain *sd, int this_cpu,
         do {
                 int local_group;
 
-                local_group = cpumask_test_cpu(this_cpu,
-                                               sched_group_cpus(group));
+                local_group = cpumask_test_cpu(this_cpu, sched_group_cpus(sg));
                 memset(&sgs, 0, sizeof(sgs));
-                update_sg_lb_stats(sd, group, this_cpu, idle, load_idx, sd_idle,
+                update_sg_lb_stats(sd, sg, this_cpu, idle, load_idx, sd_idle,
                                 local_group, cpus, balance, &sgs);
 
                 if (local_group && !(*balance))
                         return;
 
                 sds->total_load += sgs.group_load;
-                sds->total_pwr += group->cpu_power;
+                sds->total_pwr += sg->cpu_power;
 
                 /*
                  * In case the child domain prefers tasks go to siblings
-                 * first, lower the group capacity to one so that we'll try
+                 * first, lower the sg capacity to one so that we'll try
                  * and move all the excess tasks away.
                  */
                 if (prefer_sibling)
@@ -2481,23 +2552,72 @@ static inline void update_sd_lb_stats(struct sched_domain *sd, int this_cpu,
 
                 if (local_group) {
                         sds->this_load = sgs.avg_load;
-                        sds->this = group;
+                        sds->this = sg;
                         sds->this_nr_running = sgs.sum_nr_running;
                         sds->this_load_per_task = sgs.sum_weighted_load;
-                } else if (sgs.avg_load > sds->max_load &&
-                           (sgs.sum_nr_running > sgs.group_capacity ||
-                                sgs.group_imb)) {
+                } else if (update_sd_pick_busiest(sd, sds, sg, &sgs, this_cpu)) {
                         sds->max_load = sgs.avg_load;
-                        sds->busiest = group;
+                        sds->busiest = sg;
                         sds->busiest_nr_running = sgs.sum_nr_running;
                         sds->busiest_group_capacity = sgs.group_capacity;
                         sds->busiest_load_per_task = sgs.sum_weighted_load;
                         sds->group_imb = sgs.group_imb;
                 }
 
-                update_sd_power_savings_stats(group, sds, local_group, &sgs);
-                group = group->next;
-        } while (group != sd->groups);
+                update_sd_power_savings_stats(sg, sds, local_group, &sgs);
+                sg = sg->next;
+        } while (sg != sd->groups);
+}
+
+int __weak arch_sd_sibling_asym_packing(void)
+{
+       return 0*SD_ASYM_PACKING;
+}
+
+/**
+ * check_asym_packing - Check to see if the group is packed into the
+ *                      sched doman.
+ *
+ * This is primarily intended to used at the sibling level.  Some
+ * cores like POWER7 prefer to use lower numbered SMT threads.  In the
+ * case of POWER7, it can move to lower SMT modes only when higher
+ * threads are idle.  When in lower SMT modes, the threads will
+ * perform better since they share less core resources.  Hence when we
+ * have idle threads, we want them to be the higher ones.
+ *
+ * This packing function is run on idle threads.  It checks to see if
+ * the busiest CPU in this domain (core in the P7 case) has a higher
+ * CPU number than the packing function is being run on.  Here we are
+ * assuming lower CPU number will be equivalent to lower a SMT thread
+ * number.
+ *
+ * Returns 1 when packing is required and a task should be moved to
+ * this CPU.  The amount of the imbalance is returned in *imbalance.
+ *
+ * @sd: The sched_domain whose packing is to be checked.
+ * @sds: Statistics of the sched_domain which is to be packed
+ * @this_cpu: The cpu at whose sched_domain we're performing load-balance.
+ * @imbalance: returns amount of imbalanced due to packing.
+ */
+static int check_asym_packing(struct sched_domain *sd,
+                              struct sd_lb_stats *sds,
+                              int this_cpu, unsigned long *imbalance)
+{
+        int busiest_cpu;
+
+        if (!(sd->flags & SD_ASYM_PACKING))
+                return 0;
+
+        if (!sds->busiest)
+                return 0;
+
+        busiest_cpu = group_first_cpu(sds->busiest);
+        if (this_cpu > busiest_cpu)
+                return 0;
+
+        *imbalance = DIV_ROUND_CLOSEST(sds->max_load * sds->busiest->cpu_power,
+                                       SCHED_LOAD_SCALE);
+        return 1;
 }
 
 /**
@@ -2692,6 +2812,10 @@ find_busiest_group(struct sched_domain *sd, int this_cpu,
         if (!(*balance))
                 goto ret;
 
+        if ((idle == CPU_IDLE || idle == CPU_NEWLY_IDLE) &&
+            check_asym_packing(sd, &sds, this_cpu, imbalance))
+                return sds.busiest;
+
         if (!sds.busiest || sds.busiest_nr_running == 0)
                 goto out_balanced;
 
@@ -2726,8 +2850,9 @@ ret:
  * find_busiest_queue - find the busiest runqueue among the cpus in group.
  */
 static struct rq *
-find_busiest_queue(struct sched_group *group, enum cpu_idle_type idle,
-                   unsigned long imbalance, const struct cpumask *cpus)
+find_busiest_queue(struct sched_domain *sd, struct sched_group *group,
+                   enum cpu_idle_type idle, unsigned long imbalance,
+                   const struct cpumask *cpus)
 {
         struct rq *busiest = NULL, *rq;
         unsigned long max_load = 0;
@@ -2738,6 +2863,9 @@ find_busiest_queue(struct sched_group *group, enum cpu_idle_type idle,
                 unsigned long capacity = DIV_ROUND_CLOSEST(power, SCHED_LOAD_SCALE);
                 unsigned long wl;
 
+                if (!capacity)
+                        capacity = fix_small_capacity(sd, group);
+
                 if (!cpumask_test_cpu(i, cpus))
                         continue;
 
@@ -2777,9 +2905,19 @@ find_busiest_queue(struct sched_group *group, enum cpu_idle_type idle,
 /* Working cpumask for load_balance and load_balance_newidle. */
 static DEFINE_PER_CPU(cpumask_var_t, load_balance_tmpmask);
 
-static int need_active_balance(struct sched_domain *sd, int sd_idle, int idle)
+static int need_active_balance(struct sched_domain *sd, int sd_idle, int idle,
+                               int busiest_cpu, int this_cpu)
 {
         if (idle == CPU_NEWLY_IDLE) {
+
+                /*
+                 * ASYM_PACKING needs to force migrate tasks from busy but
+                 * higher numbered CPUs in order to pack all tasks in the
+                 * lowest numbered CPUs.
+                 */
+                if ((sd->flags & SD_ASYM_PACKING) && busiest_cpu > this_cpu)
+                        return 1;
+
                 /*
                  * The only task running in a non-idle cpu can be moved to this
                  * cpu in an attempt to completely freeup the other CPU
@@ -2854,7 +2992,7 @@ redo:
                 goto out_balanced;
         }
 
-        busiest = find_busiest_queue(group, idle, imbalance, cpus);
+        busiest = find_busiest_queue(sd, group, idle, imbalance, cpus);
         if (!busiest) {
                 schedstat_inc(sd, lb_nobusyq[idle]);
                 goto out_balanced;
@@ -2898,7 +3036,8 @@ redo:
                 schedstat_inc(sd, lb_failed[idle]);
                 sd->nr_balance_failed++;
 
-                if (need_active_balance(sd, sd_idle, idle)) {
+                if (need_active_balance(sd, sd_idle, idle, cpu_of(busiest),
+                                        this_cpu)) {
                         raw_spin_lock_irqsave(&busiest->lock, flags);
 
                         /* don't kick the active_load_balance_cpu_stop,
@@ -3093,13 +3232,40 @@ out_unlock:
 }
 
 #ifdef CONFIG_NO_HZ
+
+static DEFINE_PER_CPU(struct call_single_data, remote_sched_softirq_cb);
+
+static void trigger_sched_softirq(void *data)
+{
+        raise_softirq_irqoff(SCHED_SOFTIRQ);
+}
+
+static inline void init_sched_softirq_csd(struct call_single_data *csd)
+{
+        csd->func = trigger_sched_softirq;
+        csd->info = NULL;
+        csd->flags = 0;
+        csd->priv = 0;
+}
+
+/*
+ * idle load balancing details
+ * - One of the idle CPUs nominates itself as idle load_balancer, while
+ *   entering idle.
+ * - This idle load balancer CPU will also go into tickless mode when
+ *   it is idle, just like all other idle CPUs
+ * - When one of the busy CPUs notice that there may be an idle rebalancing
+ *   needed, they will kick the idle load balancer, which then does idle
+ *   load balancing for all the idle CPUs.
+ */
 static struct {
         atomic_t load_balancer;
-        cpumask_var_t cpu_mask;
-        cpumask_var_t ilb_grp_nohz_mask;
-} nohz ____cacheline_aligned = {
-        .load_balancer = ATOMIC_INIT(-1),
-};
+        atomic_t first_pick_cpu;
+        atomic_t second_pick_cpu;
+        cpumask_var_t idle_cpus_mask;
+        cpumask_var_t grp_idle_mask;
+        unsigned long next_balance;     /* in jiffy units */
+} nohz ____cacheline_aligned;
 
 int get_nohz_load_balancer(void)
 {
@@ -3153,17 +3319,17 @@ static inline struct sched_domain *lowest_flag_domain(int cpu, int flag)
  */
 static inline int is_semi_idle_group(struct sched_group *ilb_group)
 {
-        cpumask_and(nohz.ilb_grp_nohz_mask, nohz.cpu_mask,
+        cpumask_and(nohz.grp_idle_mask, nohz.idle_cpus_mask,
                                         sched_group_cpus(ilb_group));
 
         /*
          * A sched_group is semi-idle when it has atleast one busy cpu
          * and atleast one idle cpu.
          */
-        if (cpumask_empty(nohz.ilb_grp_nohz_mask))
+        if (cpumask_empty(nohz.grp_idle_mask))
                 return 0;
 
-        if (cpumask_equal(nohz.ilb_grp_nohz_mask, sched_group_cpus(ilb_group)))
+        if (cpumask_equal(nohz.grp_idle_mask, sched_group_cpus(ilb_group)))
                 return 0;
 
         return 1;
@@ -3196,7 +3362,7 @@ static int find_new_ilb(int cpu)
          * Optimize for the case when we have no idle CPUs or only one
          * idle CPU. Don't walk the sched_domain hierarchy in such cases
          */
-        if (cpumask_weight(nohz.cpu_mask) < 2)
+        if (cpumask_weight(nohz.idle_cpus_mask) < 2)
                 goto out_done;
 
         for_each_flag_domain(cpu, sd, SD_POWERSAVINGS_BALANCE) {
@@ -3204,7 +3370,7 @@ static int find_new_ilb(int cpu)
 
                 do {
                         if (is_semi_idle_group(ilb_group))
-                                return cpumask_first(nohz.ilb_grp_nohz_mask);
+                                return cpumask_first(nohz.grp_idle_mask);
 
                         ilb_group = ilb_group->next;
 
@@ -3212,98 +3378,116 @@ static int find_new_ilb(int cpu)
         }
 
 out_done:
-        return cpumask_first(nohz.cpu_mask);
+        return nr_cpu_ids;
 }
 #else /*  (CONFIG_SCHED_MC || CONFIG_SCHED_SMT) */
 static inline int find_new_ilb(int call_cpu)
 {
-        return cpumask_first(nohz.cpu_mask);
+        return nr_cpu_ids;
 }
 #endif
 
 /*
+ * Kick a CPU to do the nohz balancing, if it is time for it. We pick the
+ * nohz_load_balancer CPU (if there is one) otherwise fallback to any idle
+ * CPU (if there is one).
+ */
+static void nohz_balancer_kick(int cpu)
+{
+        int ilb_cpu;
+
+        nohz.next_balance++;
+
+        ilb_cpu = get_nohz_load_balancer();
+
+        if (ilb_cpu >= nr_cpu_ids) {
+                ilb_cpu = cpumask_first(nohz.idle_cpus_mask);
+                if (ilb_cpu >= nr_cpu_ids)
+                        return;
+        }
+
+        if (!cpu_rq(ilb_cpu)->nohz_balance_kick) {
+                struct call_single_data *cp;
+
+                cpu_rq(ilb_cpu)->nohz_balance_kick = 1;
+                cp = &per_cpu(remote_sched_softirq_cb, cpu);
+                __smp_call_function_single(ilb_cpu, cp, 0);
+        }
+        return;
+}
+
+/*
  * This routine will try to nominate the ilb (idle load balancing)
  * owner among the cpus whose ticks are stopped. ilb owner will do the idle
- * load balancing on behalf of all those cpus. If all the cpus in the system
- * go into this tickless mode, then there will be no ilb owner (as there is
- * no need for one) and all the cpus will sleep till the next wakeup event
- * arrives...
+ * load balancing on behalf of all those cpus.
  *
- * For the ilb owner, tick is not stopped. And this tick will be used
- * for idle load balancing. ilb owner will still be part of
- * nohz.cpu_mask..
+ * When the ilb owner becomes busy, we will not have new ilb owner until some
+ * idle CPU wakes up and goes back to idle or some busy CPU tries to kick
+ * idle load balancing by kicking one of the idle CPUs.
  *
- * While stopping the tick, this cpu will become the ilb owner if there
- * is no other owner. And will be the owner till that cpu becomes busy
- * or if all cpus in the system stop their ticks at which point
- * there is no need for ilb owner.
- *
- * When the ilb owner becomes busy, it nominates another owner, during the
- * next busy scheduler_tick()
+ * Ticks are stopped for the ilb owner as well, with busy CPU kicking this
+ * ilb owner CPU in future (when there is a need for idle load balancing on
+ * behalf of all idle CPUs).
  */
-int select_nohz_load_balancer(int stop_tick)
+void select_nohz_load_balancer(int stop_tick)
 {
         int cpu = smp_processor_id();
 
         if (stop_tick) {
-                cpu_rq(cpu)->in_nohz_recently = 1;
-
                 if (!cpu_active(cpu)) {
                         if (atomic_read(&nohz.load_balancer) != cpu)
-                                return 0;
+                                return;
 
                         /*
                          * If we are going offline and still the leader,
                          * give up!
                          */
-                        if (atomic_cmpxchg(&nohz.load_balancer, cpu, -1) != cpu)
+                        if (atomic_cmpxchg(&nohz.load_balancer, cpu,
+                                           nr_cpu_ids) != cpu)
                                 BUG();
 
-                        return 0;
+                        return;
                 }
 
-                cpumask_set_cpu(cpu, nohz.cpu_mask);
+                cpumask_set_cpu(cpu, nohz.idle_cpus_mask);
 
-                /* time for ilb owner also to sleep */
-                if (cpumask_weight(nohz.cpu_mask) == num_active_cpus()) {
-                        if (atomic_read(&nohz.load_balancer) == cpu)
-                                atomic_set(&nohz.load_balancer, -1);
-                        return 0;
-                }
+                if (atomic_read(&nohz.first_pick_cpu) == cpu)
+                        atomic_cmpxchg(&nohz.first_pick_cpu, cpu, nr_cpu_ids);
+                if (atomic_read(&nohz.second_pick_cpu) == cpu)
+                        atomic_cmpxchg(&nohz.second_pick_cpu, cpu, nr_cpu_ids);
 
-                if (atomic_read(&nohz.load_balancer) == -1) {
-                        /* make me the ilb owner */
-                        if (atomic_cmpxchg(&nohz.load_balancer, -1, cpu) == -1)
-                                return 1;
-                } else if (atomic_read(&nohz.load_balancer) == cpu) {
+                if (atomic_read(&nohz.load_balancer) >= nr_cpu_ids) {
                         int new_ilb;
 
-                        if (!(sched_smt_power_savings ||
-                                                sched_mc_power_savings))
-                                return 1;
+                        /* make me the ilb owner */
+                        if (atomic_cmpxchg(&nohz.load_balancer, nr_cpu_ids,
+                                           cpu) != nr_cpu_ids)
+                                return;
+
                         /*
                          * Check to see if there is a more power-efficient
                          * ilb.
                          */
                         new_ilb = find_new_ilb(cpu);
                         if (new_ilb < nr_cpu_ids && new_ilb != cpu) {
-                                atomic_set(&nohz.load_balancer, -1);
+                                atomic_set(&nohz.load_balancer, nr_cpu_ids);
                                 resched_cpu(new_ilb);
-                                return 0;
+                                return;
                         }
-                        return 1;
+                        return;
                 }
         } else {
-                if (!cpumask_test_cpu(cpu, nohz.cpu_mask))
-                        return 0;
+                if (!cpumask_test_cpu(cpu, nohz.idle_cpus_mask))
+                        return;
 
-                cpumask_clear_cpu(cpu, nohz.cpu_mask);
+                cpumask_clear_cpu(cpu, nohz.idle_cpus_mask);
 
                 if (atomic_read(&nohz.load_balancer) == cpu)
-                        if (atomic_cmpxchg(&nohz.load_balancer, cpu, -1) != cpu)
+                        if (atomic_cmpxchg(&nohz.load_balancer, cpu,
+                                           nr_cpu_ids) != cpu)
                                 BUG();
         }
-        return 0;
+        return;
 }
 #endif
 
@@ -3385,11 +3569,102 @@ out:
                 rq->next_balance = next_balance;
 }
 
+#ifdef CONFIG_NO_HZ
 /*
- * run_rebalance_domains is triggered when needed from the scheduler tick.
- * In CONFIG_NO_HZ case, the idle load balance owner will do the
+ * In CONFIG_NO_HZ case, the idle balance kickee will do the
  * rebalancing for all the cpus for whom scheduler ticks are stopped.
  */
+static void nohz_idle_balance(int this_cpu, enum cpu_idle_type idle)
+{
+        struct rq *this_rq = cpu_rq(this_cpu);
+        struct rq *rq;
+        int balance_cpu;
+
+        if (idle != CPU_IDLE || !this_rq->nohz_balance_kick)
+                return;
+
+        for_each_cpu(balance_cpu, nohz.idle_cpus_mask) {
+                if (balance_cpu == this_cpu)
+                        continue;
+
+                /*
+                 * If this cpu gets work to do, stop the load balancing
+                 * work being done for other cpus. Next load
+                 * balancing owner will pick it up.
+                 */
+                if (need_resched()) {
+                        this_rq->nohz_balance_kick = 0;
+                        break;
+                }
+
+                raw_spin_lock_irq(&this_rq->lock);
+                update_rq_clock(this_rq);
+                update_cpu_load(this_rq);
+                raw_spin_unlock_irq(&this_rq->lock);
+
+                rebalance_domains(balance_cpu, CPU_IDLE);
+
+                rq = cpu_rq(balance_cpu);
+                if (time_after(this_rq->next_balance, rq->next_balance))
+                        this_rq->next_balance = rq->next_balance;
+        }
+        nohz.next_balance = this_rq->next_balance;
+        this_rq->nohz_balance_kick = 0;
+}
+
+/*
+ * Current heuristic for kicking the idle load balancer
+ * - first_pick_cpu is the one of the busy CPUs. It will kick
+ *   idle load balancer when it has more than one process active. This
+ *   eliminates the need for idle load balancing altogether when we have
+ *   only one running process in the system (common case).
+ * - If there are more than one busy CPU, idle load balancer may have
+ *   to run for active_load_balance to happen (i.e., two busy CPUs are
+ *   SMT or core siblings and can run better if they move to different
+ *   physical CPUs). So, second_pick_cpu is the second of the busy CPUs
+ *   which will kick idle load balancer as soon as it has any load.
+ */
+static inline int nohz_kick_needed(struct rq *rq, int cpu)
+{
+        unsigned long now = jiffies;
+        int ret;
+        int first_pick_cpu, second_pick_cpu;
+
+        if (time_before(now, nohz.next_balance))
+                return 0;
+
+        if (!rq->nr_running)
+                return 0;
+
+        first_pick_cpu = atomic_read(&nohz.first_pick_cpu);
+        second_pick_cpu = atomic_read(&nohz.second_pick_cpu);
+
+        if (first_pick_cpu < nr_cpu_ids && first_pick_cpu != cpu &&
+            second_pick_cpu < nr_cpu_ids && second_pick_cpu != cpu)
+                return 0;
+
+        ret = atomic_cmpxchg(&nohz.first_pick_cpu, nr_cpu_ids, cpu);
+        if (ret == nr_cpu_ids || ret == cpu) {
+                atomic_cmpxchg(&nohz.second_pick_cpu, cpu, nr_cpu_ids);
+                if (rq->nr_running > 1)
+                        return 1;
+        } else {
+                ret = atomic_cmpxchg(&nohz.second_pick_cpu, nr_cpu_ids, cpu);
+                if (ret == nr_cpu_ids || ret == cpu) {
+                        if (rq->nr_running)
+                                return 1;
+                }
+        }
+        return 0;
+}
+#else
+static void nohz_idle_balance(int this_cpu, enum cpu_idle_type idle) { }
+#endif
+
+/*
+ * run_rebalance_domains is triggered when needed from the scheduler tick.
+ * Also triggered for nohz idle balancing (with nohz_balancing_kick set).
+ */
 static void run_rebalance_domains(struct softirq_action *h)
 {
         int this_cpu = smp_processor_id();
@@ -3399,37 +3674,12 @@ static void run_rebalance_domains(struct softirq_action *h)
 
         rebalance_domains(this_cpu, idle);
 
-#ifdef CONFIG_NO_HZ
         /*
-         * If this cpu is the owner for idle load balancing, then do the
+         * If this cpu has a pending nohz_balance_kick, then do the
          * balancing on behalf of the other idle cpus whose ticks are
          * stopped.
          */
-        if (this_rq->idle_at_tick &&
-            atomic_read(&nohz.load_balancer) == this_cpu) {
-                struct rq *rq;
-                int balance_cpu;
-
-                for_each_cpu(balance_cpu, nohz.cpu_mask) {
-                        if (balance_cpu == this_cpu)
-                                continue;
-
-                        /*
-                         * If this cpu gets work to do, stop the load balancing
-                         * work being done for other cpus. Next load
-                         * balancing owner will pick it up.
-                         */
-                        if (need_resched())
-                                break;
-
-                        rebalance_domains(balance_cpu, CPU_IDLE);
-
-                        rq = cpu_rq(balance_cpu);
-                        if (time_after(this_rq->next_balance, rq->next_balance))
-                                this_rq->next_balance = rq->next_balance;
-                }
-        }
-#endif
+        nohz_idle_balance(this_cpu, idle);
 }
 
 static inline int on_null_domain(int cpu)
@@ -3439,57 +3689,17 @@ static inline int on_null_domain(int cpu)
 
 /*
  * Trigger the SCHED_SOFTIRQ if it is time to do periodic load balancing.
- *
- * In case of CONFIG_NO_HZ, this is the place where we nominate a new
- * idle load balancing owner or decide to stop the periodic load balancing,
- * if the whole system is idle.
  */
 static inline void trigger_load_balance(struct rq *rq, int cpu)
 {
-#ifdef CONFIG_NO_HZ
-        /*
-         * If we were in the nohz mode recently and busy at the current
-         * scheduler tick, then check if we need to nominate new idle
-         * load balancer.
-         */
-        if (rq->in_nohz_recently && !rq->idle_at_tick) {
-                rq->in_nohz_recently = 0;
-
-                if (atomic_read(&nohz.load_balancer) == cpu) {
-                        cpumask_clear_cpu(cpu, nohz.cpu_mask);
-                        atomic_set(&nohz.load_balancer, -1);
-                }
-
-                if (atomic_read(&nohz.load_balancer) == -1) {
-                        int ilb = find_new_ilb(cpu);
-
-                        if (ilb < nr_cpu_ids)
-                                resched_cpu(ilb);
-                }
-        }
-
-        /*
-         * If this cpu is idle and doing idle load balancing for all the
-         * cpus with ticks stopped, is it time for that to stop?
-         */
-        if (rq->idle_at_tick && atomic_read(&nohz.load_balancer) == cpu &&
-            cpumask_weight(nohz.cpu_mask) == num_online_cpus()) {
-                resched_cpu(cpu);
-                return;
-        }
-
-        /*
-         * If this cpu is idle and the idle load balancing is done by
-         * someone else, then no need raise the SCHED_SOFTIRQ
-         */
-        if (rq->idle_at_tick && atomic_read(&nohz.load_balancer) != cpu &&
-            cpumask_test_cpu(cpu, nohz.cpu_mask))
-                return;
-#endif
         /* Don't need to rebalance while attached to NULL domain */
         if (time_after_eq(jiffies, rq->next_balance) &&
             likely(!on_null_domain(cpu)))
                 raise_softirq(SCHED_SOFTIRQ);
+#ifdef CONFIG_NO_HZ
+        else if (nohz_kick_needed(rq, cpu) && likely(!on_null_domain(cpu)))
+                nohz_balancer_kick(cpu);
+#endif
 }
 
 static void rq_online_fair(struct rq *rq)
@@ -3542,6 +3752,8 @@ static void task_fork_fair(struct task_struct *p)
 
         raw_spin_lock_irqsave(&rq->lock, flags);
 
+        update_rq_clock(rq);
+
         if (unlikely(task_cpu(p) != this_cpu))
                 __set_task_cpu(p, this_cpu);
 
diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index 8afb953e31c6..d10c80ebb67a 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -1663,9 +1663,6 @@ static void watchdog(struct rq *rq, struct task_struct *p)
 {
         unsigned long soft, hard;
 
-        if (!p->signal)
-                return;
-
         /* max may change after cur was read, this will be fixed next tick */
         soft = task_rlimit(p, RLIMIT_RTTIME);
         hard = task_rlimit_max(p, RLIMIT_RTTIME);
diff --git a/kernel/sched_stats.h b/kernel/sched_stats.h
index 32d2bd4061b0..25c2f962f6fc 100644
--- a/kernel/sched_stats.h
+++ b/kernel/sched_stats.h
@@ -295,13 +295,7 @@ sched_info_switch(struct task_struct *prev, struct task_struct *next)
 static inline void account_group_user_time(struct task_struct *tsk,
                                            cputime_t cputime)
 {
-        struct thread_group_cputimer *cputimer;
-
-        /* tsk == current, ensure it is safe to use ->signal */
-        if (unlikely(tsk->exit_state))
-                return;
-
-        cputimer = &tsk->signal->cputimer;
+        struct thread_group_cputimer *cputimer = &tsk->signal->cputimer;
 
         if (!cputimer->running)
                 return;
@@ -325,13 +319,7 @@ static inline void account_group_user_time(struct task_struct *tsk,
 static inline void account_group_system_time(struct task_struct *tsk,
                                              cputime_t cputime)
 {
-        struct thread_group_cputimer *cputimer;
-
-        /* tsk == current, ensure it is safe to use ->signal */
-        if (unlikely(tsk->exit_state))
-                return;
-
-        cputimer = &tsk->signal->cputimer;
+        struct thread_group_cputimer *cputimer = &tsk->signal->cputimer;
 
         if (!cputimer->running)
                 return;
@@ -355,16 +343,7 @@ static inline void account_group_system_time(struct task_struct *tsk,
 static inline void account_group_exec_runtime(struct task_struct *tsk,
                                               unsigned long long ns)
 {
-        struct thread_group_cputimer *cputimer;
-        struct signal_struct *sig;
-
-        sig = tsk->signal;
-        /* see __exit_signal()->task_rq_unlock_wait() */
-        barrier();
-        if (unlikely(!sig))
-                return;
-
-        cputimer = &sig->cputimer;
+        struct thread_group_cputimer *cputimer = &tsk->signal->cputimer;
 
         if (!cputimer->running)
                 return;
diff --git a/kernel/signal.c b/kernel/signal.c
index 906ae5a1779c..bded65187780 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -637,7 +637,7 @@ static inline bool si_fromuser(const struct siginfo *info)
 
 /*
  * Bad permissions for sending the signal
- * - the caller must hold at least the RCU read lock
+ * - the caller must hold the RCU read lock
  */
 static int check_kill_permission(int sig, struct siginfo *info,
                                  struct task_struct *t)
@@ -1127,11 +1127,14 @@ struct sighand_struct *lock_task_sighand(struct task_struct *tsk, unsigned long
 
 /*
  * send signal info to all the members of a group
- * - the caller must hold the RCU read lock at least
  */
 int group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p)
 {
-        int ret = check_kill_permission(sig, info, p);
+        int ret;
+
+        rcu_read_lock();
+        ret = check_kill_permission(sig, info, p);
+        rcu_read_unlock();
 
         if (!ret && sig)
                 ret = do_send_sig_info(sig, info, p, true);
diff --git a/kernel/slow-work-debugfs.c b/kernel/slow-work-debugfs.c
deleted file mode 100644
index e45c43645298..000000000000
--- a/kernel/slow-work-debugfs.c
+++ /dev/null
@@ -1,227 +0,0 @@
-/* Slow work debugging
- *
- * Copyright (C) 2009 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public Licence
- * as published by the Free Software Foundation; either version
- * 2 of the Licence, or (at your option) any later version.
- */
-
-#include <linux/module.h>
-#include <linux/slow-work.h>
-#include <linux/fs.h>
-#include <linux/time.h>
-#include <linux/seq_file.h>
-#include "slow-work.h"
-
-#define ITERATOR_SHIFT          (BITS_PER_LONG - 4)
-#define ITERATOR_SELECTOR       (0xfUL << ITERATOR_SHIFT)
-#define ITERATOR_COUNTER        (~ITERATOR_SELECTOR)
-
-void slow_work_new_thread_desc(struct slow_work *work, struct seq_file *m)
-{
-        seq_puts(m, "Slow-work: New thread");
-}
-
-/*
- * Render the time mark field on a work item into a 5-char time with units plus
- * a space
- */
-static void slow_work_print_mark(struct seq_file *m, struct slow_work *work)
-{
-        struct timespec now, diff;
-
-        now = CURRENT_TIME;
-        diff = timespec_sub(now, work->mark);
-
-        if (diff.tv_sec < 0)
-                seq_puts(m, "  -ve ");
-        else if (diff.tv_sec == 0 && diff.tv_nsec < 1000)
-                seq_printf(m, "%3luns ", diff.tv_nsec);
-        else if (diff.tv_sec == 0 && diff.tv_nsec < 1000000)
-                seq_printf(m, "%3luus ", diff.tv_nsec / 1000);
-        else if (diff.tv_sec == 0 && diff.tv_nsec < 1000000000)
-                seq_printf(m, "%3lums ", diff.tv_nsec / 1000000);
-        else if (diff.tv_sec <= 1)
-                seq_puts(m, "   1s ");
-        else if (diff.tv_sec < 60)
-                seq_printf(m, "%4lus ", diff.tv_sec);
-        else if (diff.tv_sec < 60 * 60)
-                seq_printf(m, "%4lum ", diff.tv_sec / 60);
-        else if (diff.tv_sec < 60 * 60 * 24)
-                seq_printf(m, "%4luh ", diff.tv_sec / 3600);
-        else
-                seq_puts(m, "exces ");
-}
-
-/*
- * Describe a slow work item for debugfs
- */
-static int slow_work_runqueue_show(struct seq_file *m, void *v)
-{
-        struct slow_work *work;
-        struct list_head *p = v;
-        unsigned long id;
-
-        switch ((unsigned long) v) {
-        case 1:
-                seq_puts(m, "THR PID   ITEM ADDR        FL MARK  DESC\n");
-                return 0;
-        case 2:
-                seq_puts(m, "=== ===== ================ == ===== ==========\n");
-                return 0;
-
-        case 3 ... 3 + SLOW_WORK_THREAD_LIMIT - 1:
-                id = (unsigned long) v - 3;
-
-                read_lock(&slow_work_execs_lock);
-                work = slow_work_execs[id];
-                if (work) {
-                        smp_read_barrier_depends();
-
-                        seq_printf(m, "%3lu %5d %16p %2lx ",
-                                   id, slow_work_pids[id], work, work->flags);
-                        slow_work_print_mark(m, work);
-
-                        if (work->ops->desc)
-                                work->ops->desc(work, m);
-                        seq_putc(m, '\n');
-                }
-                read_unlock(&slow_work_execs_lock);
-                return 0;
-
-        default:
-                work = list_entry(p, struct slow_work, link);
-                seq_printf(m, "%3s     - %16p %2lx ",
-                           work->flags & SLOW_WORK_VERY_SLOW ? "vsq" : "sq",
-                           work, work->flags);
-                slow_work_print_mark(m, work);
-
-                if (work->ops->desc)
-                        work->ops->desc(work, m);
-                seq_putc(m, '\n');
-                return 0;
-        }
-}
-
-/*
- * map the iterator to a work item
- */
-static void *slow_work_runqueue_index(struct seq_file *m, loff_t *_pos)
-{
-        struct list_head *p;
-        unsigned long count, id;
-
-        switch (*_pos >> ITERATOR_SHIFT) {
-        case 0x0:
-                if (*_pos == 0)
-                        *_pos = 1;
-                if (*_pos < 3)
-                        return (void *)(unsigned long) *_pos;
-                if (*_pos < 3 + SLOW_WORK_THREAD_LIMIT)
-                        for (id = *_pos - 3;
-                             id < SLOW_WORK_THREAD_LIMIT;
-                             id++, (*_pos)++)
-                                if (slow_work_execs[id])
-                                        return (void *)(unsigned long) *_pos;
-                *_pos = 0x1UL << ITERATOR_SHIFT;
-
-        case 0x1:
-                count = *_pos & ITERATOR_COUNTER;
-                list_for_each(p, &slow_work_queue) {
-                        if (count == 0)
-                                return p;
-                        count--;
-                }
-                *_pos = 0x2UL << ITERATOR_SHIFT;
-
-        case 0x2:
-                count = *_pos & ITERATOR_COUNTER;
-                list_for_each(p, &vslow_work_queue) {
-                        if (count == 0)
-                                return p;
-                        count--;
-                }
-                *_pos = 0x3UL << ITERATOR_SHIFT;
-
-        default:
-                return NULL;
-        }
-}
-
-/*
- * set up the iterator to start reading from the first line
- */
-static void *slow_work_runqueue_start(struct seq_file *m, loff_t *_pos)
-{
-        spin_lock_irq(&slow_work_queue_lock);
-        return slow_work_runqueue_index(m, _pos);
-}
-
-/*
- * move to the next line
- */
-static void *slow_work_runqueue_next(struct seq_file *m, void *v, loff_t *_pos)
-{
-        struct list_head *p = v;
-        unsigned long selector = *_pos >> ITERATOR_SHIFT;
-
-        (*_pos)++;
-        switch (selector) {
-        case 0x0:
-                return slow_work_runqueue_index(m, _pos);
-
-        case 0x1:
-                if (*_pos >> ITERATOR_SHIFT == 0x1) {
-                        p = p->next;
-                        if (p != &slow_work_queue)
-                                return p;
-                }
-                *_pos = 0x2UL << ITERATOR_SHIFT;
-                p = &vslow_work_queue;
-
-        case 0x2:
-                if (*_pos >> ITERATOR_SHIFT == 0x2) {
-                        p = p->next;
-                        if (p != &vslow_work_queue)
-                                return p;
-                }
-                *_pos = 0x3UL << ITERATOR_SHIFT;
-
-        default:
-                return NULL;
-        }
-}
-
-/*
- * clean up after reading
- */
-static void slow_work_runqueue_stop(struct seq_file *m, void *v)
-{
-        spin_unlock_irq(&slow_work_queue_lock);
-}
-
-static const struct seq_operations slow_work_runqueue_ops = {
-        .start          = slow_work_runqueue_start,
-        .stop           = slow_work_runqueue_stop,
-        .next           = slow_work_runqueue_next,
-        .show           = slow_work_runqueue_show,
-};
-
-/*
- * open "/sys/kernel/debug/slow_work/runqueue" to list queue contents
- */
-static int slow_work_runqueue_open(struct inode *inode, struct file *file)
-{
-        return seq_open(file, &slow_work_runqueue_ops);
-}
-
-const struct file_operations slow_work_runqueue_fops = {
-        .owner          = THIS_MODULE,
-        .open           = slow_work_runqueue_open,
-        .read           = seq_read,
-        .llseek         = seq_lseek,
-        .release        = seq_release,
-};
diff --git a/kernel/slow-work.c b/kernel/slow-work.c
deleted file mode 100644
index 7d3f4fa9ef4f..000000000000
--- a/kernel/slow-work.c
+++ /dev/null
@@ -1,1068 +0,0 @@
-/* Worker thread pool for slow items, such as filesystem lookups or mkdirs
- *
- * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public Licence
- * as published by the Free Software Foundation; either version
- * 2 of the Licence, or (at your option) any later version.
- *
- * See Documentation/slow-work.txt
- */
-
-#include <linux/module.h>
-#include <linux/slow-work.h>
-#include <linux/kthread.h>
-#include <linux/freezer.h>
-#include <linux/wait.h>
-#include <linux/debugfs.h>
-#include "slow-work.h"
-
-static void slow_work_cull_timeout(unsigned long);
-static void slow_work_oom_timeout(unsigned long);
-
-#ifdef CONFIG_SYSCTL
-static int slow_work_min_threads_sysctl(struct ctl_table *, int,
-                                        void __user *, size_t *, loff_t *);
-
-static int slow_work_max_threads_sysctl(struct ctl_table *, int ,
-                                        void __user *, size_t *, loff_t *);
-#endif
-
-/*
- * The pool of threads has at least min threads in it as long as someone is
- * using the facility, and may have as many as max.
- *
- * A portion of the pool may be processing very slow operations.
- */
-static unsigned slow_work_min_threads = 2;
-static unsigned slow_work_max_threads = 4;
-static unsigned vslow_work_proportion = 50; /* % of threads that may process
-                                             * very slow work */
-
-#ifdef CONFIG_SYSCTL
-static const int slow_work_min_min_threads = 2;
-static int slow_work_max_max_threads = SLOW_WORK_THREAD_LIMIT;
-static const int slow_work_min_vslow = 1;
-static const int slow_work_max_vslow = 99;
-
-ctl_table slow_work_sysctls[] = {
-        {
-                .procname       = "min-threads",
-                .data           = &slow_work_min_threads,
-                .maxlen         = sizeof(unsigned),
-                .mode           = 0644,
-                .proc_handler   = slow_work_min_threads_sysctl,
-                .extra1         = (void *) &slow_work_min_min_threads,
-                .extra2         = &slow_work_max_threads,
-        },
-        {
-                .procname       = "max-threads",
-                .data           = &slow_work_max_threads,
-                .maxlen         = sizeof(unsigned),
-                .mode           = 0644,
-                .proc_handler   = slow_work_max_threads_sysctl,
-                .extra1         = &slow_work_min_threads,
-                .extra2         = (void *) &slow_work_max_max_threads,
-        },
-        {
-                .procname       = "vslow-percentage",
-                .data           = &vslow_work_proportion,
-                .maxlen         = sizeof(unsigned),
-                .mode           = 0644,
-                .proc_handler   = proc_dointvec_minmax,
-                .extra1         = (void *) &slow_work_min_vslow,
-                .extra2         = (void *) &slow_work_max_vslow,
-        },
-        {}
-};
-#endif
-
-/*
- * The active state of the thread pool
- */
-static atomic_t slow_work_thread_count;
-static atomic_t vslow_work_executing_count;
-
-static bool slow_work_may_not_start_new_thread;
-static bool slow_work_cull; /* cull a thread due to lack of activity */
-static DEFINE_TIMER(slow_work_cull_timer, slow_work_cull_timeout, 0, 0);
-static DEFINE_TIMER(slow_work_oom_timer, slow_work_oom_timeout, 0, 0);
-static struct slow_work slow_work_new_thread; /* new thread starter */
-
-/*
- * slow work ID allocation (use slow_work_queue_lock)
- */
-static DECLARE_BITMAP(slow_work_ids, SLOW_WORK_THREAD_LIMIT);
-
-/*
- * Unregistration tracking to prevent put_ref() from disappearing during module
- * unload
- */
-#ifdef CONFIG_MODULES
-static struct module *slow_work_thread_processing[SLOW_WORK_THREAD_LIMIT];
-static struct module *slow_work_unreg_module;
-static struct slow_work *slow_work_unreg_work_item;
-static DECLARE_WAIT_QUEUE_HEAD(slow_work_unreg_wq);
-static DEFINE_MUTEX(slow_work_unreg_sync_lock);
-
-static void slow_work_set_thread_processing(int id, struct slow_work *work)
-{
-        if (work)
-                slow_work_thread_processing[id] = work->owner;
-}
-static void slow_work_done_thread_processing(int id, struct slow_work *work)
-{
-        struct module *module = slow_work_thread_processing[id];
-
-        slow_work_thread_processing[id] = NULL;
-        smp_mb();
-        if (slow_work_unreg_work_item == work ||
-            slow_work_unreg_module == module)
-                wake_up_all(&slow_work_unreg_wq);
-}
-static void slow_work_clear_thread_processing(int id)
-{
-        slow_work_thread_processing[id] = NULL;
-}
-#else
-static void slow_work_set_thread_processing(int id, struct slow_work *work) {}
-static void slow_work_done_thread_processing(int id, struct slow_work *work) {}
-static void slow_work_clear_thread_processing(int id) {}
-#endif
-
-/*
- * Data for tracking currently executing items for indication through /proc
- */
-#ifdef CONFIG_SLOW_WORK_DEBUG
-struct slow_work *slow_work_execs[SLOW_WORK_THREAD_LIMIT];
-pid_t slow_work_pids[SLOW_WORK_THREAD_LIMIT];
-DEFINE_RWLOCK(slow_work_execs_lock);
-#endif
-
-/*
- * The queues of work items and the lock governing access to them.  These are
- * shared between all the CPUs.  It doesn't make sense to have per-CPU queues
- * as the number of threads bears no relation to the number of CPUs.
- *
- * There are two queues of work items: one for slow work items, and one for
- * very slow work items.
- */
-LIST_HEAD(slow_work_queue);
-LIST_HEAD(vslow_work_queue);
-DEFINE_SPINLOCK(slow_work_queue_lock);
-
-/*
- * The following are two wait queues that get pinged when a work item is placed
- * on an empty queue.  These allow work items that are hogging a thread by
- * sleeping in a way that could be deferred to yield their thread and enqueue
- * themselves.
- */
-static DECLARE_WAIT_QUEUE_HEAD(slow_work_queue_waits_for_occupation);
-static DECLARE_WAIT_QUEUE_HEAD(vslow_work_queue_waits_for_occupation);
-
-/*
- * The thread controls.  A variable used to signal to the threads that they
- * should exit when the queue is empty, a waitqueue used by the threads to wait
- * for signals, and a completion set by the last thread to exit.
- */
-static bool slow_work_threads_should_exit;
-static DECLARE_WAIT_QUEUE_HEAD(slow_work_thread_wq);
-static DECLARE_COMPLETION(slow_work_last_thread_exited);
-
-/*
- * The number of users of the thread pool and its lock.  Whilst this is zero we
- * have no threads hanging around, and when this reaches zero, we wait for all
- * active or queued work items to complete and kill all the threads we do have.
- */
-static int slow_work_user_count;
-static DEFINE_MUTEX(slow_work_user_lock);
-
-static inline int slow_work_get_ref(struct slow_work *work)
-{
-        if (work->ops->get_ref)
-                return work->ops->get_ref(work);
-
-        return 0;
-}
-
-static inline void slow_work_put_ref(struct slow_work *work)
-{
-        if (work->ops->put_ref)
-                work->ops->put_ref(work);
-}
-
-/*
- * Calculate the maximum number of active threads in the pool that are
- * permitted to process very slow work items.
- *
- * The answer is rounded up to at least 1, but may not equal or exceed the
- * maximum number of the threads in the pool.  This means we always have at
- * least one thread that can process slow work items, and we always have at
- * least one thread that won't get tied up doing so.
- */
-static unsigned slow_work_calc_vsmax(void)
-{
-        unsigned vsmax;
-
-        vsmax = atomic_read(&slow_work_thread_count) * vslow_work_proportion;
-        vsmax /= 100;
-        vsmax = max(vsmax, 1U);
-        return min(vsmax, slow_work_max_threads - 1);
-}
-
-/*
- * Attempt to execute stuff queued on a slow thread.  Return true if we managed
- * it, false if there was nothing to do.
- */
-static noinline bool slow_work_execute(int id)
-{
-        struct slow_work *work = NULL;
-        unsigned vsmax;
-        bool very_slow;
-
-        vsmax = slow_work_calc_vsmax();
-
-        /* see if we can schedule a new thread to be started if we're not
-         * keeping up with the work */
-        if (!waitqueue_active(&slow_work_thread_wq) &&
-            (!list_empty(&slow_work_queue) || !list_empty(&vslow_work_queue)) &&
-            atomic_read(&slow_work_thread_count) < slow_work_max_threads &&
-            !slow_work_may_not_start_new_thread)
-                slow_work_enqueue(&slow_work_new_thread);
-
-        /* find something to execute */
-        spin_lock_irq(&slow_work_queue_lock);
-        if (!list_empty(&vslow_work_queue) &&
-            atomic_read(&vslow_work_executing_count) < vsmax) {
-                work = list_entry(vslow_work_queue.next,
-                                  struct slow_work, link);
-                if (test_and_set_bit_lock(SLOW_WORK_EXECUTING, &work->flags))
-                        BUG();
-                list_del_init(&work->link);
-                atomic_inc(&vslow_work_executing_count);
-                very_slow = true;
-        } else if (!list_empty(&slow_work_queue)) {
-                work = list_entry(slow_work_queue.next,
-                                  struct slow_work, link);
-                if (test_and_set_bit_lock(SLOW_WORK_EXECUTING, &work->flags))
-                        BUG();
-                list_del_init(&work->link);
-                very_slow = false;
-        } else {
-                very_slow = false; /* avoid the compiler warning */
-        }
-
-        slow_work_set_thread_processing(id, work);
-        if (work) {
-                slow_work_mark_time(work);
-                slow_work_begin_exec(id, work);
-        }
-
-        spin_unlock_irq(&slow_work_queue_lock);
-
-        if (!work)
-                return false;
-
-        if (!test_and_clear_bit(SLOW_WORK_PENDING, &work->flags))
-                BUG();
-
-        /* don't execute if the work is in the process of being cancelled */
-        if (!test_bit(SLOW_WORK_CANCELLING, &work->flags))
-                work->ops->execute(work);
-
-        if (very_slow)
-                atomic_dec(&vslow_work_executing_count);
-        clear_bit_unlock(SLOW_WORK_EXECUTING, &work->flags);
-
-        /* wake up anyone waiting for this work to be complete */
-        wake_up_bit(&work->flags, SLOW_WORK_EXECUTING);
-
-        slow_work_end_exec(id, work);
-
-        /* if someone tried to enqueue the item whilst we were executing it,
-         * then it'll be left unenqueued to avoid multiple threads trying to
-         * execute it simultaneously
-         *
-         * there is, however, a race between us testing the pending flag and
-         * getting the spinlock, and between the enqueuer setting the pending
-         * flag and getting the spinlock, so we use a deferral bit to tell us
-         * if the enqueuer got there first
-         */
-        if (test_bit(SLOW_WORK_PENDING, &work->flags)) {
-                spin_lock_irq(&slow_work_queue_lock);
-
-                if (!test_bit(SLOW_WORK_EXECUTING, &work->flags) &&
-                    test_and_clear_bit(SLOW_WORK_ENQ_DEFERRED, &work->flags))
-                        goto auto_requeue;
-
-                spin_unlock_irq(&slow_work_queue_lock);
-        }
-
-        /* sort out the race between module unloading and put_ref() */
-        slow_work_put_ref(work);
-        slow_work_done_thread_processing(id, work);
-
-        return true;
-
-auto_requeue:
-        /* we must complete the enqueue operation
-         * - we transfer our ref on the item back to the appropriate queue
-         * - don't wake another thread up as we're awake already
-         */
-        slow_work_mark_time(work);
-        if (test_bit(SLOW_WORK_VERY_SLOW, &work->flags))
-                list_add_tail(&work->link, &vslow_work_queue);
-        else
-                list_add_tail(&work->link, &slow_work_queue);
-        spin_unlock_irq(&slow_work_queue_lock);
-        slow_work_clear_thread_processing(id);
-        return true;
-}
-
-/**
- * slow_work_sleep_till_thread_needed - Sleep till thread needed by other work
- * work: The work item under execution that wants to sleep
- * _timeout: Scheduler sleep timeout
- *
- * Allow a requeueable work item to sleep on a slow-work processor thread until
- * that thread is needed to do some other work or the sleep is interrupted by
- * some other event.
- *
- * The caller must set up a wake up event before calling this and must have set
- * the appropriate sleep mode (such as TASK_UNINTERRUPTIBLE) and tested its own
- * condition before calling this function as no test is made here.
- *
- * False is returned if there is nothing on the queue; true is returned if the
- * work item should be requeued
- */
-bool slow_work_sleep_till_thread_needed(struct slow_work *work,
-                                        signed long *_timeout)
-{
-        wait_queue_head_t *wfo_wq;
-        struct list_head *queue;
-
-        DEFINE_WAIT(wait);
-
-        if (test_bit(SLOW_WORK_VERY_SLOW, &work->flags)) {
-                wfo_wq = &vslow_work_queue_waits_for_occupation;
-                queue = &vslow_work_queue;
-        } else {
-                wfo_wq = &slow_work_queue_waits_for_occupation;
-                queue = &slow_work_queue;
-        }
-
-        if (!list_empty(queue))
-                return true;
-
-        add_wait_queue_exclusive(wfo_wq, &wait);
-        if (list_empty(queue))
-                *_timeout = schedule_timeout(*_timeout);
-        finish_wait(wfo_wq, &wait);
-
-        return !list_empty(queue);
-}
-EXPORT_SYMBOL(slow_work_sleep_till_thread_needed);
-
-/**
- * slow_work_enqueue - Schedule a slow work item for processing
- * @work: The work item to queue
- *
- * Schedule a slow work item for processing.  If the item is already undergoing
- * execution, this guarantees not to re-enter the execution routine until the
- * first execution finishes.
- *
- * The item is pinned by this function as it retains a reference to it, managed
- * through the item operations.  The item is unpinned once it has been
- * executed.
- *
- * An item may hog the thread that is running it for a relatively large amount
- * of time, sufficient, for example, to perform several lookup, mkdir, create
- * and setxattr operations.  It may sleep on I/O and may sleep to obtain locks.
- *
- * Conversely, if a number of items are awaiting processing, it may take some
- * time before any given item is given attention.  The number of threads in the
- * pool may be increased to deal with demand, but only up to a limit.
- *
- * If SLOW_WORK_VERY_SLOW is set on the work item, then it will be placed in
- * the very slow queue, from which only a portion of the threads will be
- * allowed to pick items to execute.  This ensures that very slow items won't
- * overly block ones that are just ordinarily slow.
- *
- * Returns 0 if successful, -EAGAIN if not (or -ECANCELED if cancelled work is
- * attempted queued)
- */
-int slow_work_enqueue(struct slow_work *work)
-{
-        wait_queue_head_t *wfo_wq;
-        struct list_head *queue;
-        unsigned long flags;
-        int ret;
-
-        if (test_bit(SLOW_WORK_CANCELLING, &work->flags))
-                return -ECANCELED;
-
-        BUG_ON(slow_work_user_count <= 0);
-        BUG_ON(!work);
-        BUG_ON(!work->ops);
-
-        /* when honouring an enqueue request, we only promise that we will run
-         * the work function in the future; we do not promise to run it once
-         * per enqueue request
-         *
-         * we use the PENDING bit to merge together repeat requests without
-         * having to disable IRQs and take the spinlock, whilst still
-         * maintaining our promise
-         */
-        if (!test_and_set_bit_lock(SLOW_WORK_PENDING, &work->flags)) {
-                if (test_bit(SLOW_WORK_VERY_SLOW, &work->flags)) {
-                        wfo_wq = &vslow_work_queue_waits_for_occupation;
-                        queue = &vslow_work_queue;
-                } else {
-                        wfo_wq = &slow_work_queue_waits_for_occupation;
-                        queue = &slow_work_queue;
-                }
-
-                spin_lock_irqsave(&slow_work_queue_lock, flags);
-
-                if (unlikely(test_bit(SLOW_WORK_CANCELLING, &work->flags)))
-                        goto cancelled;
-
-                /* we promise that we will not attempt to execute the work
-                 * function in more than one thread simultaneously
-                 *
-                 * this, however, leaves us with a problem if we're asked to
-                 * enqueue the work whilst someone is executing the work
-                 * function as simply queueing the work immediately means that
-                 * another thread may try executing it whilst it is already
-                 * under execution
-                 *
-                 * to deal with this, we set the ENQ_DEFERRED bit instead of
-                 * enqueueing, and the thread currently executing the work
-                 * function will enqueue the work item when the work function
-                 * returns and it has cleared the EXECUTING bit
-                 */
-                if (test_bit(SLOW_WORK_EXECUTING, &work->flags)) {
-                        set_bit(SLOW_WORK_ENQ_DEFERRED, &work->flags);
-                } else {
-                        ret = slow_work_get_ref(work);
-                        if (ret < 0)
-                                goto failed;
-                        slow_work_mark_time(work);
-                        list_add_tail(&work->link, queue);
-                        wake_up(&slow_work_thread_wq);
-
-                        /* if someone who could be requeued is sleeping on a
-                         * thread, then ask them to yield their thread */
-                        if (work->link.prev == queue)
-                                wake_up(wfo_wq);
-                }
-
-                spin_unlock_irqrestore(&slow_work_queue_lock, flags);
-        }
-        return 0;
-
-cancelled:
-        ret = -ECANCELED;
-failed:
-        spin_unlock_irqrestore(&slow_work_queue_lock, flags);
-        return ret;
-}
-EXPORT_SYMBOL(slow_work_enqueue);
-
-static int slow_work_wait(void *word)
-{
-        schedule();
-        return 0;
-}
-
-/**
- * slow_work_cancel - Cancel a slow work item
- * @work: The work item to cancel
- *
- * This function will cancel a previously enqueued work item. If we cannot
- * cancel the work item, it is guarenteed to have run when this function
- * returns.
- */
-void slow_work_cancel(struct slow_work *work)
-{
-        bool wait = true, put = false;
-
-        set_bit(SLOW_WORK_CANCELLING, &work->flags);
-        smp_mb();
-
-        /* if the work item is a delayed work item with an active timer, we
-         * need to wait for the timer to finish _before_ getting the spinlock,
-         * lest we deadlock against the timer routine
-         *
-         * the timer routine will leave DELAYED set if it notices the
-         * CANCELLING flag in time
-         */
-        if (test_bit(SLOW_WORK_DELAYED, &work->flags)) {
-                struct delayed_slow_work *dwork =
-                        container_of(work, struct delayed_slow_work, work);
-                del_timer_sync(&dwork->timer);
-        }
-
-        spin_lock_irq(&slow_work_queue_lock);
-
-        if (test_bit(SLOW_WORK_DELAYED, &work->flags)) {
-                /* the timer routine aborted or never happened, so we are left
-                 * holding the timer's reference on the item and should just
-                 * drop the pending flag and wait for any ongoing execution to
-                 * finish */
-                struct delayed_slow_work *dwork =
-                        container_of(work, struct delayed_slow_work, work);
-
-                BUG_ON(timer_pending(&dwork->timer));
-                BUG_ON(!list_empty(&work->link));
-
-                clear_bit(SLOW_WORK_DELAYED, &work->flags);
-                put = true;
-                clear_bit(SLOW_WORK_PENDING, &work->flags);
-
-        } else if (test_bit(SLOW_WORK_PENDING, &work->flags) &&
-                   !list_empty(&work->link)) {
-                /* the link in the pending queue holds a reference on the item
-                 * that we will need to release */
-                list_del_init(&work->link);
-                wait = false;
-                put = true;
-                clear_bit(SLOW_WORK_PENDING, &work->flags);
-
-        } else if (test_and_clear_bit(SLOW_WORK_ENQ_DEFERRED, &work->flags)) {
-                /* the executor is holding our only reference on the item, so
-                 * we merely need to wait for it to finish executing */
-                clear_bit(SLOW_WORK_PENDING, &work->flags);
-        }
-
-        spin_unlock_irq(&slow_work_queue_lock);
-
-        /* the EXECUTING flag is set by the executor whilst the spinlock is set
-         * and before the item is dequeued - so assuming the above doesn't
-         * actually dequeue it, simply waiting for the EXECUTING flag to be
-         * released here should be sufficient */
-        if (wait)
-                wait_on_bit(&work->flags, SLOW_WORK_EXECUTING, slow_work_wait,
-                            TASK_UNINTERRUPTIBLE);
-
-        clear_bit(SLOW_WORK_CANCELLING, &work->flags);
-        if (put)
-                slow_work_put_ref(work);
-}
-EXPORT_SYMBOL(slow_work_cancel);
-
-/*
- * Handle expiry of the delay timer, indicating that a delayed slow work item
- * should now be queued if not cancelled
- */
-static void delayed_slow_work_timer(unsigned long data)
-{
-        wait_queue_head_t *wfo_wq;
-        struct list_head *queue;
-        struct slow_work *work = (struct slow_work *) data;
-        unsigned long flags;
-        bool queued = false, put = false, first = false;
-
-        if (test_bit(SLOW_WORK_VERY_SLOW, &work->flags)) {
-                wfo_wq = &vslow_work_queue_waits_for_occupation;
-                queue = &vslow_work_queue;
-        } else {
-                wfo_wq = &slow_work_queue_waits_for_occupation;
-                queue = &slow_work_queue;
-        }
-
-        spin_lock_irqsave(&slow_work_queue_lock, flags);
-        if (likely(!test_bit(SLOW_WORK_CANCELLING, &work->flags))) {
-                clear_bit(SLOW_WORK_DELAYED, &work->flags);
-
-                if (test_bit(SLOW_WORK_EXECUTING, &work->flags)) {
-                        /* we discard the reference the timer was holding in
-                         * favour of the one the executor holds */
-                        set_bit(SLOW_WORK_ENQ_DEFERRED, &work->flags);
-                        put = true;
-                } else {
-                        slow_work_mark_time(work);
-                        list_add_tail(&work->link, queue);
-                        queued = true;
-                        if (work->link.prev == queue)
-                                first = true;
-                }
-        }
-
-        spin_unlock_irqrestore(&slow_work_queue_lock, flags);
-        if (put)
-                slow_work_put_ref(work);
-        if (first)
-                wake_up(wfo_wq);
-        if (queued)
-                wake_up(&slow_work_thread_wq);
-}
-
-/**
- * delayed_slow_work_enqueue - Schedule a delayed slow work item for processing
- * @dwork: The delayed work item to queue
- * @delay: When to start executing the work, in jiffies from now
- *
- * This is similar to slow_work_enqueue(), but it adds a delay before the work
- * is actually queued for processing.
- *
- * The item can have delayed processing requested on it whilst it is being
- * executed.  The delay will begin immediately, and if it expires before the
- * item finishes executing, the item will be placed back on the queue when it
- * has done executing.
- */
-int delayed_slow_work_enqueue(struct delayed_slow_work *dwork,
-                              unsigned long delay)
-{
-        struct slow_work *work = &dwork->work;
-        unsigned long flags;
-        int ret;
-
-        if (delay == 0)
-                return slow_work_enqueue(&dwork->work);
-
-        BUG_ON(slow_work_user_count <= 0);
-        BUG_ON(!work);
-        BUG_ON(!work->ops);
-
-        if (test_bit(SLOW_WORK_CANCELLING, &work->flags))
-                return -ECANCELED;
-
-        if (!test_and_set_bit_lock(SLOW_WORK_PENDING, &work->flags)) {
-                spin_lock_irqsave(&slow_work_queue_lock, flags);
-
-                if (test_bit(SLOW_WORK_CANCELLING, &work->flags))
-                        goto cancelled;
-
-                /* the timer holds a reference whilst it is pending */
-                ret = slow_work_get_ref(work);
-                if (ret < 0)
-                        goto cant_get_ref;
-
-                if (test_and_set_bit(SLOW_WORK_DELAYED, &work->flags))
-                        BUG();
-                dwork->timer.expires = jiffies + delay;
-                dwork->timer.data = (unsigned long) work;
-                dwork->timer.function = delayed_slow_work_timer;
-                add_timer(&dwork->timer);
-
-                spin_unlock_irqrestore(&slow_work_queue_lock, flags);
-        }
-
-        return 0;
-
-cancelled:
-        ret = -ECANCELED;
-cant_get_ref:
-        spin_unlock_irqrestore(&slow_work_queue_lock, flags);
-        return ret;
-}
-EXPORT_SYMBOL(delayed_slow_work_enqueue);
-
-/*
- * Schedule a cull of the thread pool at some time in the near future
- */
-static void slow_work_schedule_cull(void)
-{
-        mod_timer(&slow_work_cull_timer,
-                  round_jiffies(jiffies + SLOW_WORK_CULL_TIMEOUT));
-}
-
-/*
- * Worker thread culling algorithm
- */
-static bool slow_work_cull_thread(void)
-{
-        unsigned long flags;
-        bool do_cull = false;
-
-        spin_lock_irqsave(&slow_work_queue_lock, flags);
-
-        if (slow_work_cull) {
-                slow_work_cull = false;
-
-                if (list_empty(&slow_work_queue) &&
-                    list_empty(&vslow_work_queue) &&
-                    atomic_read(&slow_work_thread_count) >
-                    slow_work_min_threads) {
-                        slow_work_schedule_cull();
-                        do_cull = true;
-                }
-        }
-
-        spin_unlock_irqrestore(&slow_work_queue_lock, flags);
-        return do_cull;
-}
-
-/*
- * Determine if there is slow work available for dispatch
- */
-static inline bool slow_work_available(int vsmax)
-{
-        return !list_empty(&slow_work_queue) ||
-                (!list_empty(&vslow_work_queue) &&
-                 atomic_read(&vslow_work_executing_count) < vsmax);
-}
-
-/*
- * Worker thread dispatcher
- */
-static int slow_work_thread(void *_data)
-{
-        int vsmax, id;
-
-        DEFINE_WAIT(wait);
-
-        set_freezable();
-        set_user_nice(current, -5);
-
-        /* allocate ourselves an ID */
-        spin_lock_irq(&slow_work_queue_lock);
-        id = find_first_zero_bit(slow_work_ids, SLOW_WORK_THREAD_LIMIT);
-        BUG_ON(id < 0 || id >= SLOW_WORK_THREAD_LIMIT);
-        __set_bit(id, slow_work_ids);
-        slow_work_set_thread_pid(id, current->pid);
-        spin_unlock_irq(&slow_work_queue_lock);
-
-        sprintf(current->comm, "kslowd%03u", id);
-
-        for (;;) {
-                vsmax = vslow_work_proportion;
-                vsmax *= atomic_read(&slow_work_thread_count);
-                vsmax /= 100;
-
-                prepare_to_wait_exclusive(&slow_work_thread_wq, &wait,
-                                          TASK_INTERRUPTIBLE);
-                if (!freezing(current) &&
-                    !slow_work_threads_should_exit &&
-                    !slow_work_available(vsmax) &&
-                    !slow_work_cull)
-                        schedule();
-                finish_wait(&slow_work_thread_wq, &wait);
-
-                try_to_freeze();
-
-                vsmax = vslow_work_proportion;
-                vsmax *= atomic_read(&slow_work_thread_count);
-                vsmax /= 100;
-
-                if (slow_work_available(vsmax) && slow_work_execute(id)) {
-                        cond_resched();
-                        if (list_empty(&slow_work_queue) &&
-                            list_empty(&vslow_work_queue) &&
-                            atomic_read(&slow_work_thread_count) >
-                            slow_work_min_threads)
-                                slow_work_schedule_cull();
-                        continue;
-                }
-
-                if (slow_work_threads_should_exit)
-                        break;
-
-                if (slow_work_cull && slow_work_cull_thread())
-                        break;
-        }
-
-        spin_lock_irq(&slow_work_queue_lock);
-        slow_work_set_thread_pid(id, 0);
-        __clear_bit(id, slow_work_ids);
-        spin_unlock_irq(&slow_work_queue_lock);
-
-        if (atomic_dec_and_test(&slow_work_thread_count))
-                complete_and_exit(&slow_work_last_thread_exited, 0);
-        return 0;
-}
-
-/*
- * Handle thread cull timer expiration
- */
-static void slow_work_cull_timeout(unsigned long data)
-{
-        slow_work_cull = true;
-        wake_up(&slow_work_thread_wq);
-}
-
-/*
- * Start a new slow work thread
- */
-static void slow_work_new_thread_execute(struct slow_work *work)
-{
-        struct task_struct *p;
-
-        if (slow_work_threads_should_exit)
-                return;
-
-        if (atomic_read(&slow_work_thread_count) >= slow_work_max_threads)
-                return;
-
-        if (!mutex_trylock(&slow_work_user_lock))
-                return;
-
-        slow_work_may_not_start_new_thread = true;
-        atomic_inc(&slow_work_thread_count);
-        p = kthread_run(slow_work_thread, NULL, "kslowd");
-        if (IS_ERR(p)) {
-                printk(KERN_DEBUG "Slow work thread pool: OOM\n");
-                if (atomic_dec_and_test(&slow_work_thread_count))
-                        BUG(); /* we're running on a slow work thread... */
-                mod_timer(&slow_work_oom_timer,
-                          round_jiffies(jiffies + SLOW_WORK_OOM_TIMEOUT));
-        } else {
-                /* ratelimit the starting of new threads */
-                mod_timer(&slow_work_oom_timer, jiffies + 1);
-        }
-
-        mutex_unlock(&slow_work_user_lock);
-}
-
-static const struct slow_work_ops slow_work_new_thread_ops = {
-        .owner          = THIS_MODULE,
-        .execute        = slow_work_new_thread_execute,
-#ifdef CONFIG_SLOW_WORK_DEBUG
-        .desc           = slow_work_new_thread_desc,
-#endif
-};
-
-/*
- * post-OOM new thread start suppression expiration
- */
-static void slow_work_oom_timeout(unsigned long data)
-{
-        slow_work_may_not_start_new_thread = false;
-}
-
-#ifdef CONFIG_SYSCTL
-/*
- * Handle adjustment of the minimum number of threads
- */
-static int slow_work_min_threads_sysctl(struct ctl_table *table, int write,
-                                        void __user *buffer,
-                                        size_t *lenp, loff_t *ppos)
-{
-        int ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
-        int n;
-
-        if (ret == 0) {
-                mutex_lock(&slow_work_user_lock);
-                if (slow_work_user_count > 0) {
-                        /* see if we need to start or stop threads */
-                        n = atomic_read(&slow_work_thread_count) -
-                                slow_work_min_threads;
-
-                        if (n < 0 && !slow_work_may_not_start_new_thread)
-                                slow_work_enqueue(&slow_work_new_thread);
-                        else if (n > 0)
-                                slow_work_schedule_cull();
-                }
-                mutex_unlock(&slow_work_user_lock);
-        }
-
-        return ret;
-}
-
-/*
- * Handle adjustment of the maximum number of threads
- */
-static int slow_work_max_threads_sysctl(struct ctl_table *table, int write,
-                                        void __user *buffer,
-                                        size_t *lenp, loff_t *ppos)
-{
-        int ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
-        int n;
-
-        if (ret == 0) {
-                mutex_lock(&slow_work_user_lock);
-                if (slow_work_user_count > 0) {
-                        /* see if we need to stop threads */
-                        n = slow_work_max_threads -
-                                atomic_read(&slow_work_thread_count);
-
-                        if (n < 0)
-                                slow_work_schedule_cull();
-                }
-                mutex_unlock(&slow_work_user_lock);
-        }
-
-        return ret;
-}
-#endif /* CONFIG_SYSCTL */
-
-/**
- * slow_work_register_user - Register a user of the facility
- * @module: The module about to make use of the facility
- *
- * Register a user of the facility, starting up the initial threads if there
- * aren't any other users at this point.  This will return 0 if successful, or
- * an error if not.
- */
-int slow_work_register_user(struct module *module)
-{
-        struct task_struct *p;
-        int loop;
-
-        mutex_lock(&slow_work_user_lock);
-
-        if (slow_work_user_count == 0) {
-                printk(KERN_NOTICE "Slow work thread pool: Starting up\n");
-                init_completion(&slow_work_last_thread_exited);
-
-                slow_work_threads_should_exit = false;
-                slow_work_init(&slow_work_new_thread,
-                               &slow_work_new_thread_ops);
-                slow_work_may_not_start_new_thread = false;
-                slow_work_cull = false;
-
-                /* start the minimum number of threads */
-                for (loop = 0; loop < slow_work_min_threads; loop++) {
-                        atomic_inc(&slow_work_thread_count);
-                        p = kthread_run(slow_work_thread, NULL, "kslowd");
-                        if (IS_ERR(p))
-                                goto error;
-                }
-                printk(KERN_NOTICE "Slow work thread pool: Ready\n");
-        }
-
-        slow_work_user_count++;
-        mutex_unlock(&slow_work_user_lock);
-        return 0;
-
-error:
-        if (atomic_dec_and_test(&slow_work_thread_count))
-                complete(&slow_work_last_thread_exited);
-        if (loop > 0) {
-                printk(KERN_ERR "Slow work thread pool:"
-                       " Aborting startup on ENOMEM\n");
-                slow_work_threads_should_exit = true;
-                wake_up_all(&slow_work_thread_wq);
-                wait_for_completion(&slow_work_last_thread_exited);
-                printk(KERN_ERR "Slow work thread pool: Aborted\n");
-        }
-        mutex_unlock(&slow_work_user_lock);
-        return PTR_ERR(p);
-}
-EXPORT_SYMBOL(slow_work_register_user);
-
-/*
- * wait for all outstanding items from the calling module to complete
- * - note that more items may be queued whilst we're waiting
- */
-static void slow_work_wait_for_items(struct module *module)
-{
-#ifdef CONFIG_MODULES
-        DECLARE_WAITQUEUE(myself, current);
-        struct slow_work *work;
-        int loop;
-
-        mutex_lock(&slow_work_unreg_sync_lock);
-        add_wait_queue(&slow_work_unreg_wq, &myself);
-
-        for (;;) {
-                spin_lock_irq(&slow_work_queue_lock);
-
-                /* first of all, we wait for the last queued item in each list
-                 * to be processed */
-                list_for_each_entry_reverse(work, &vslow_work_queue, link) {
-                        if (work->owner == module) {
-                                set_current_state(TASK_UNINTERRUPTIBLE);
-                                slow_work_unreg_work_item = work;
-                                goto do_wait;
-                        }
-                }
-                list_for_each_entry_reverse(work, &slow_work_queue, link) {
-                        if (work->owner == module) {
-                                set_current_state(TASK_UNINTERRUPTIBLE);
-                                slow_work_unreg_work_item = work;
-                                goto do_wait;
-                        }
-                }
-
-                /* then we wait for the items being processed to finish */
-                slow_work_unreg_module = module;
-                smp_mb();
-                for (loop = 0; loop < SLOW_WORK_THREAD_LIMIT; loop++) {
-                        if (slow_work_thread_processing[loop] == module)
-                                goto do_wait;
-                }
-                spin_unlock_irq(&slow_work_queue_lock);
-                break; /* okay, we're done */
-
-        do_wait:
-                spin_unlock_irq(&slow_work_queue_lock);
-                schedule();
-                slow_work_unreg_work_item = NULL;
-                slow_work_unreg_module = NULL;
-        }
-
-        remove_wait_queue(&slow_work_unreg_wq, &myself);
-        mutex_unlock(&slow_work_unreg_sync_lock);
-#endif /* CONFIG_MODULES */
-}
-
-/**
- * slow_work_unregister_user - Unregister a user of the facility
- * @module: The module whose items should be cleared
- *
- * Unregister a user of the facility, killing all the threads if this was the
- * last one.
- *
- * This waits for all the work items belonging to the nominated module to go
- * away before proceeding.
- */
-void slow_work_unregister_user(struct module *module)
-{
-        /* first of all, wait for all outstanding items from the calling module
-         * to complete */
-        if (module)
-                slow_work_wait_for_items(module);
-
-        /* then we can actually go about shutting down the facility if need
-         * be */
-        mutex_lock(&slow_work_user_lock);
-
-        BUG_ON(slow_work_user_count <= 0);
-
-        slow_work_user_count--;
-        if (slow_work_user_count == 0) {
-                printk(KERN_NOTICE "Slow work thread pool: Shutting down\n");
-                slow_work_threads_should_exit = true;
-                del_timer_sync(&slow_work_cull_timer);
-                del_timer_sync(&slow_work_oom_timer);
-                wake_up_all(&slow_work_thread_wq);
-                wait_for_completion(&slow_work_last_thread_exited);
-                printk(KERN_NOTICE "Slow work thread pool:"
-                       " Shut down complete\n");
-        }
-
-        mutex_unlock(&slow_work_user_lock);
-}
-EXPORT_SYMBOL(slow_work_unregister_user);
-
-/*
- * Initialise the slow work facility
- */
-static int __init init_slow_work(void)
-{
-        unsigned nr_cpus = num_possible_cpus();
-
-        if (slow_work_max_threads < nr_cpus)
-                slow_work_max_threads = nr_cpus;
-#ifdef CONFIG_SYSCTL
-        if (slow_work_max_max_threads < nr_cpus * 2)
-                slow_work_max_max_threads = nr_cpus * 2;
-#endif
-#ifdef CONFIG_SLOW_WORK_DEBUG
-        {
-                struct dentry *dbdir;
-
-                dbdir = debugfs_create_dir("slow_work", NULL);
-                if (dbdir && !IS_ERR(dbdir))
-                        debugfs_create_file("runqueue", S_IFREG | 0400, dbdir,
-                                            NULL, &slow_work_runqueue_fops);
-        }
-#endif
-        return 0;
-}
-
-subsys_initcall(init_slow_work);
diff --git a/kernel/slow-work.h b/kernel/slow-work.h
deleted file mode 100644
index a29ebd1ef41d..000000000000
--- a/kernel/slow-work.h
+++ /dev/null
@@ -1,72 +0,0 @@
-/* Slow work private definitions
- *
- * Copyright (C) 2009 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public Licence
- * as published by the Free Software Foundation; either version
- * 2 of the Licence, or (at your option) any later version.
- */
-
-#define SLOW_WORK_CULL_TIMEOUT (5 * HZ) /* cull threads 5s after running out of
-                                         * things to do */
-#define SLOW_WORK_OOM_TIMEOUT (5 * HZ)  /* can't start new threads for 5s after
-                                         * OOM */
-
-#define SLOW_WORK_THREAD_LIMIT  255     /* abs maximum number of slow-work threads */
-
-/*
- * slow-work.c
- */
-#ifdef CONFIG_SLOW_WORK_DEBUG
-extern struct slow_work *slow_work_execs[];
-extern pid_t slow_work_pids[];
-extern rwlock_t slow_work_execs_lock;
-#endif
-
-extern struct list_head slow_work_queue;
-extern struct list_head vslow_work_queue;
-extern spinlock_t slow_work_queue_lock;
-
-/*
- * slow-work-debugfs.c
- */
-#ifdef CONFIG_SLOW_WORK_DEBUG
-extern const struct file_operations slow_work_runqueue_fops;
-
-extern void slow_work_new_thread_desc(struct slow_work *, struct seq_file *);
-#endif
-
-/*
- * Helper functions
- */
-static inline void slow_work_set_thread_pid(int id, pid_t pid)
-{
-#ifdef CONFIG_SLOW_WORK_DEBUG
-        slow_work_pids[id] = pid;
-#endif
-}
-
-static inline void slow_work_mark_time(struct slow_work *work)
-{
-#ifdef CONFIG_SLOW_WORK_DEBUG
-        work->mark = CURRENT_TIME;
-#endif
-}
-
-static inline void slow_work_begin_exec(int id, struct slow_work *work)
-{
-#ifdef CONFIG_SLOW_WORK_DEBUG
-        slow_work_execs[id] = work;
-#endif
-}
-
-static inline void slow_work_end_exec(int id, struct slow_work *work)
-{
-#ifdef CONFIG_SLOW_WORK_DEBUG
-        write_lock(&slow_work_execs_lock);
-        slow_work_execs[id] = NULL;
-        write_unlock(&slow_work_execs_lock);
-#endif
-}
diff --git a/kernel/softlockup.c b/kernel/softlockup.c
deleted file mode 100644
index 4b493f67dcb5..000000000000
--- a/kernel/softlockup.c
+++ /dev/null
@@ -1,293 +0,0 @@
-/*
- * Detect Soft Lockups
- *
- * started by Ingo Molnar, Copyright (C) 2005, 2006 Red Hat, Inc.
- *
- * this code detects soft lockups: incidents in where on a CPU
- * the kernel does not reschedule for 10 seconds or more.
- */
-#include <linux/mm.h>
-#include <linux/cpu.h>
-#include <linux/nmi.h>
-#include <linux/init.h>
-#include <linux/delay.h>
-#include <linux/freezer.h>
-#include <linux/kthread.h>
-#include <linux/lockdep.h>
-#include <linux/notifier.h>
-#include <linux/module.h>
-#include <linux/sysctl.h>
-
-#include <asm/irq_regs.h>
-
-static DEFINE_SPINLOCK(print_lock);
-
-static DEFINE_PER_CPU(unsigned long, softlockup_touch_ts); /* touch timestamp */
-static DEFINE_PER_CPU(unsigned long, softlockup_print_ts); /* print timestamp */
-static DEFINE_PER_CPU(struct task_struct *, softlockup_watchdog);
-static DEFINE_PER_CPU(bool, softlock_touch_sync);
-
-static int __read_mostly did_panic;
-int __read_mostly softlockup_thresh = 60;
-
-/*
- * Should we panic (and reboot, if panic_timeout= is set) when a
- * soft-lockup occurs:
- */
-unsigned int __read_mostly softlockup_panic =
-                                CONFIG_BOOTPARAM_SOFTLOCKUP_PANIC_VALUE;
-
-static int __init softlockup_panic_setup(char *str)
-{
-        softlockup_panic = simple_strtoul(str, NULL, 0);
-
-        return 1;
-}
-__setup("softlockup_panic=", softlockup_panic_setup);
-
-static int
-softlock_panic(struct notifier_block *this, unsigned long event, void *ptr)
-{
-        did_panic = 1;
-
-        return NOTIFY_DONE;
-}
-
-static struct notifier_block panic_block = {
-        .notifier_call = softlock_panic,
-};
-
-/*
- * Returns seconds, approximately.  We don't need nanosecond
- * resolution, and we don't need to waste time with a big divide when
- * 2^30ns == 1.074s.
- */
-static unsigned long get_timestamp(int this_cpu)
-{
-        return cpu_clock(this_cpu) >> 30LL;  /* 2^30 ~= 10^9 */
-}
-
-static void __touch_softlockup_watchdog(void)
-{
-        int this_cpu = raw_smp_processor_id();
-
-        __raw_get_cpu_var(softlockup_touch_ts) = get_timestamp(this_cpu);
-}
-
-void touch_softlockup_watchdog(void)
-{
-        __raw_get_cpu_var(softlockup_touch_ts) = 0;
-}
-EXPORT_SYMBOL(touch_softlockup_watchdog);
-
-void touch_softlockup_watchdog_sync(void)
-{
-        __raw_get_cpu_var(softlock_touch_sync) = true;
-        __raw_get_cpu_var(softlockup_touch_ts) = 0;
-}
-
-void touch_all_softlockup_watchdogs(void)
-{
-        int cpu;
-
-        /* Cause each CPU to re-update its timestamp rather than complain */
-        for_each_online_cpu(cpu)
-                per_cpu(softlockup_touch_ts, cpu) = 0;
-}
-EXPORT_SYMBOL(touch_all_softlockup_watchdogs);
-
-int proc_dosoftlockup_thresh(struct ctl_table *table, int write,
-                             void __user *buffer,
-                             size_t *lenp, loff_t *ppos)
-{
-        touch_all_softlockup_watchdogs();
-        return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
-}
-
-/*
- * This callback runs from the timer interrupt, and checks
- * whether the watchdog thread has hung or not:
- */
-void softlockup_tick(void)
-{
-        int this_cpu = smp_processor_id();
-        unsigned long touch_ts = per_cpu(softlockup_touch_ts, this_cpu);
-        unsigned long print_ts;
-        struct pt_regs *regs = get_irq_regs();
-        unsigned long now;
-
-        /* Is detection switched off? */
-        if (!per_cpu(softlockup_watchdog, this_cpu) || softlockup_thresh <= 0) {
-                /* Be sure we don't false trigger if switched back on */
-                if (touch_ts)
-                        per_cpu(softlockup_touch_ts, this_cpu) = 0;
-                return;
-        }
-
-        if (touch_ts == 0) {
-                if (unlikely(per_cpu(softlock_touch_sync, this_cpu))) {
-                        /*
-                         * If the time stamp was touched atomically
-                         * make sure the scheduler tick is up to date.
-                         */
-                        per_cpu(softlock_touch_sync, this_cpu) = false;
-                        sched_clock_tick();
-                }
-                __touch_softlockup_watchdog();
-                return;
-        }
-
-        print_ts = per_cpu(softlockup_print_ts, this_cpu);
-
-        /* report at most once a second */
-        if (print_ts == touch_ts || did_panic)
-                return;
-
-        /* do not print during early bootup: */
-        if (unlikely(system_state != SYSTEM_RUNNING)) {
-                __touch_softlockup_watchdog();
-                return;
-        }
-
-        now = get_timestamp(this_cpu);
-
-        /*
-         * Wake up the high-prio watchdog task twice per
-         * threshold timespan.
-         */
-        if (time_after(now - softlockup_thresh/2, touch_ts))
-                wake_up_process(per_cpu(softlockup_watchdog, this_cpu));
-
-        /* Warn about unreasonable delays: */
-        if (time_before_eq(now - softlockup_thresh, touch_ts))
-                return;
-
-        per_cpu(softlockup_print_ts, this_cpu) = touch_ts;
-
-        spin_lock(&print_lock);
-        printk(KERN_ERR "BUG: soft lockup - CPU#%d stuck for %lus! [%s:%d]\n",
-                        this_cpu, now - touch_ts,
-                        current->comm, task_pid_nr(current));
-        print_modules();
-        print_irqtrace_events(current);
-        if (regs)
-                show_regs(regs);
-        else
-                dump_stack();
-        spin_unlock(&print_lock);
-
-        if (softlockup_panic)
-                panic("softlockup: hung tasks");
-}
-
-/*
- * The watchdog thread - runs every second and touches the timestamp.
- */
-static int watchdog(void *__bind_cpu)
-{
-        struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 };
-
-        sched_setscheduler(current, SCHED_FIFO, &param);
-
-        /* initialize timestamp */
-        __touch_softlockup_watchdog();
-
-        set_current_state(TASK_INTERRUPTIBLE);
-        /*
-         * Run briefly once per second to reset the softlockup timestamp.
-         * If this gets delayed for more than 60 seconds then the
-         * debug-printout triggers in softlockup_tick().
-         */
-        while (!kthread_should_stop()) {
-                __touch_softlockup_watchdog();
-                schedule();
-
-                if (kthread_should_stop())
-                        break;
-
-                set_current_state(TASK_INTERRUPTIBLE);
-        }
-        __set_current_state(TASK_RUNNING);
-
-        return 0;
-}
-
-/*
- * Create/destroy watchdog threads as CPUs come and go:
- */
-static int __cpuinit
-cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu)
-{
-        int hotcpu = (unsigned long)hcpu;
-        struct task_struct *p;
-
-        switch (action) {
-        case CPU_UP_PREPARE:
-        case CPU_UP_PREPARE_FROZEN:
-                BUG_ON(per_cpu(softlockup_watchdog, hotcpu));
-                p = kthread_create(watchdog, hcpu, "watchdog/%d", hotcpu);
-                if (IS_ERR(p)) {
-                        printk(KERN_ERR "watchdog for %i failed\n", hotcpu);
-                        return NOTIFY_BAD;
-                }
-                per_cpu(softlockup_touch_ts, hotcpu) = 0;
-                per_cpu(softlockup_watchdog, hotcpu) = p;
-                kthread_bind(p, hotcpu);
-                break;
-        case CPU_ONLINE:
-        case CPU_ONLINE_FROZEN:
-                wake_up_process(per_cpu(softlockup_watchdog, hotcpu));
-                break;
-#ifdef CONFIG_HOTPLUG_CPU
-        case CPU_UP_CANCELED:
-        case CPU_UP_CANCELED_FROZEN:
-                if (!per_cpu(softlockup_watchdog, hotcpu))
-                        break;
-                /* Unbind so it can run.  Fall thru. */
-                kthread_bind(per_cpu(softlockup_watchdog, hotcpu),
-                             cpumask_any(cpu_online_mask));
-        case CPU_DEAD:
-        case CPU_DEAD_FROZEN:
-                p = per_cpu(softlockup_watchdog, hotcpu);
-                per_cpu(softlockup_watchdog, hotcpu) = NULL;
-                kthread_stop(p);
-                break;
-#endif /* CONFIG_HOTPLUG_CPU */
-        }
-        return NOTIFY_OK;
-}
-
-static struct notifier_block __cpuinitdata cpu_nfb = {
-        .notifier_call = cpu_callback
-};
-
-static int __initdata nosoftlockup;
-
-static int __init nosoftlockup_setup(char *str)
-{
-        nosoftlockup = 1;
-        return 1;
-}
-__setup("nosoftlockup", nosoftlockup_setup);
-
-static int __init spawn_softlockup_task(void)
-{
-        void *cpu = (void *)(long)smp_processor_id();
-        int err;
-
-        if (nosoftlockup)
-                return 0;
-
-        err = cpu_callback(&cpu_nfb, CPU_UP_PREPARE, cpu);
-        if (err == NOTIFY_BAD) {
-                BUG();
-                return 1;
-        }
-        cpu_callback(&cpu_nfb, CPU_ONLINE, cpu);
-        register_cpu_notifier(&cpu_nfb);
-
-        atomic_notifier_chain_register(&panic_notifier_list, &panic_block);
-
-        return 0;
-}
-early_initcall(spawn_softlockup_task);
diff --git a/kernel/stop_machine.c b/kernel/stop_machine.c
index 70f8d90331e9..4372ccb25127 100644
--- a/kernel/stop_machine.c
+++ b/kernel/stop_machine.c
@@ -35,9 +35,9 @@ struct cpu_stop_done {
 /* the actual stopper, one per every possible cpu, enabled on online cpus */
 struct cpu_stopper {
         spinlock_t              lock;
+        bool                    enabled;        /* is this stopper enabled? */
         struct list_head        works;          /* list of pending works */
         struct task_struct      *thread;        /* stopper thread */
-        bool                    enabled;        /* is this stopper enabled? */
 };
 
 static DEFINE_PER_CPU(struct cpu_stopper, cpu_stopper);
diff --git a/kernel/sys.c b/kernel/sys.c
index e83ddbbaf89d..e9ad44489828 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1236,15 +1236,14 @@ SYSCALL_DEFINE2(setdomainname, char __user *, name, int, len)
 
 SYSCALL_DEFINE2(getrlimit, unsigned int, resource, struct rlimit __user *, rlim)
 {
-        if (resource >= RLIM_NLIMITS)
-                return -EINVAL;
-        else {
-                struct rlimit value;
-                task_lock(current->group_leader);
-                value = current->signal->rlim[resource];
-                task_unlock(current->group_leader);
-                return copy_to_user(rlim, &value, sizeof(*rlim)) ? -EFAULT : 0;
-        }
+        struct rlimit value;
+        int ret;
+
+        ret = do_prlimit(current, resource, NULL, &value);
+        if (!ret)
+                ret = copy_to_user(rlim, &value, sizeof(*rlim)) ? -EFAULT : 0;
+
+        return ret;
 }
 
 #ifdef __ARCH_WANT_SYS_OLD_GETRLIMIT
@@ -1272,44 +1271,89 @@ SYSCALL_DEFINE2(old_getrlimit, unsigned int, resource,
 
 #endif
 
-SYSCALL_DEFINE2(setrlimit, unsigned int, resource, struct rlimit __user *, rlim)
+static inline bool rlim64_is_infinity(__u64 rlim64)
 {
-        struct rlimit new_rlim, *old_rlim;
-        int retval;
+#if BITS_PER_LONG < 64
+        return rlim64 >= ULONG_MAX;
+#else
+        return rlim64 == RLIM64_INFINITY;
+#endif
+}
+
+static void rlim_to_rlim64(const struct rlimit *rlim, struct rlimit64 *rlim64)
+{
+        if (rlim->rlim_cur == RLIM_INFINITY)
+                rlim64->rlim_cur = RLIM64_INFINITY;
+        else
+                rlim64->rlim_cur = rlim->rlim_cur;
+        if (rlim->rlim_max == RLIM_INFINITY)
+                rlim64->rlim_max = RLIM64_INFINITY;
+        else
+                rlim64->rlim_max = rlim->rlim_max;
+}
+
+static void rlim64_to_rlim(const struct rlimit64 *rlim64, struct rlimit *rlim)
+{
+        if (rlim64_is_infinity(rlim64->rlim_cur))
+                rlim->rlim_cur = RLIM_INFINITY;
+        else
+                rlim->rlim_cur = (unsigned long)rlim64->rlim_cur;
+        if (rlim64_is_infinity(rlim64->rlim_max))
+                rlim->rlim_max = RLIM_INFINITY;
+        else
+                rlim->rlim_max = (unsigned long)rlim64->rlim_max;
+}
+
+/* make sure you are allowed to change @tsk limits before calling this */
+int do_prlimit(struct task_struct *tsk, unsigned int resource,
+                struct rlimit *new_rlim, struct rlimit *old_rlim)
+{
+        struct rlimit *rlim;
+        int retval = 0;
 
         if (resource >= RLIM_NLIMITS)
                 return -EINVAL;
-        if (copy_from_user(&new_rlim, rlim, sizeof(*rlim)))
-                return -EFAULT;
-        if (new_rlim.rlim_cur > new_rlim.rlim_max)
-                return -EINVAL;
-        old_rlim = current->signal->rlim + resource;
-        if ((new_rlim.rlim_max > old_rlim->rlim_max) &&
-            !capable(CAP_SYS_RESOURCE))
-                return -EPERM;
-        if (resource == RLIMIT_NOFILE && new_rlim.rlim_max > sysctl_nr_open)
-                return -EPERM;
-
-        retval = security_task_setrlimit(resource, &new_rlim);
-        if (retval)
-                return retval;
-
-        if (resource == RLIMIT_CPU && new_rlim.rlim_cur == 0) {
-                /*
-                 * The caller is asking for an immediate RLIMIT_CPU
-                 * expiry.  But we use the zero value to mean "it was
-                 * never set".  So let's cheat and make it one second
-                 * instead
-                 */
-                new_rlim.rlim_cur = 1;
+        if (new_rlim) {
+                if (new_rlim->rlim_cur > new_rlim->rlim_max)
+                        return -EINVAL;
+                if (resource == RLIMIT_NOFILE &&
+                                new_rlim->rlim_max > sysctl_nr_open)
+                        return -EPERM;
         }
 
-        task_lock(current->group_leader);
-        *old_rlim = new_rlim;
-        task_unlock(current->group_leader);
-
-        if (resource != RLIMIT_CPU)
+        /* protect tsk->signal and tsk->sighand from disappearing */
+        read_lock(&tasklist_lock);
+        if (!tsk->sighand) {
+                retval = -ESRCH;
                 goto out;
+        }
+
+        rlim = tsk->signal->rlim + resource;
+        task_lock(tsk->group_leader);
+        if (new_rlim) {
+                if (new_rlim->rlim_max > rlim->rlim_max &&
+                                !capable(CAP_SYS_RESOURCE))
+                        retval = -EPERM;
+                if (!retval)
+                        retval = security_task_setrlimit(tsk->group_leader,
+                                        resource, new_rlim);
+                if (resource == RLIMIT_CPU && new_rlim->rlim_cur == 0) {
+                        /*
+                         * The caller is asking for an immediate RLIMIT_CPU
+                         * expiry.  But we use the zero value to mean "it was
+                         * never set".  So let's cheat and make it one second
+                         * instead
+                         */
+                        new_rlim->rlim_cur = 1;
+                }
+        }
+        if (!retval) {
+                if (old_rlim)
+                        *old_rlim = *rlim;
+                if (new_rlim)
+                        *rlim = *new_rlim;
+        }
+        task_unlock(tsk->group_leader);
 
         /*
          * RLIMIT_CPU handling.   Note that the kernel fails to return an error
@@ -1317,14 +1361,84 @@ SYSCALL_DEFINE2(setrlimit, unsigned int, resource, struct rlimit __user *, rlim)
          * very long-standing error, and fixing it now risks breakage of
          * applications, so we live with it
          */
-        if (new_rlim.rlim_cur == RLIM_INFINITY)
-                goto out;
-
-        update_rlimit_cpu(new_rlim.rlim_cur);
+         if (!retval && new_rlim && resource == RLIMIT_CPU &&
+                         new_rlim->rlim_cur != RLIM_INFINITY)
+                update_rlimit_cpu(tsk, new_rlim->rlim_cur);
 out:
+        read_unlock(&tasklist_lock);
+        return retval;
+}
+
+/* rcu lock must be held */
+static int check_prlimit_permission(struct task_struct *task)
+{
+        const struct cred *cred = current_cred(), *tcred;
+
+        tcred = __task_cred(task);
+        if ((cred->uid != tcred->euid ||
+             cred->uid != tcred->suid ||
+             cred->uid != tcred->uid  ||
+             cred->gid != tcred->egid ||
+             cred->gid != tcred->sgid ||
+             cred->gid != tcred->gid) &&
+             !capable(CAP_SYS_RESOURCE)) {
+                return -EPERM;
+        }
+
         return 0;
 }
 
+SYSCALL_DEFINE4(prlimit64, pid_t, pid, unsigned int, resource,
+                const struct rlimit64 __user *, new_rlim,
+                struct rlimit64 __user *, old_rlim)
+{
+        struct rlimit64 old64, new64;
+        struct rlimit old, new;
+        struct task_struct *tsk;
+        int ret;
+
+        if (new_rlim) {
+                if (copy_from_user(&new64, new_rlim, sizeof(new64)))
+                        return -EFAULT;
+                rlim64_to_rlim(&new64, &new);
+        }
+
+        rcu_read_lock();
+        tsk = pid ? find_task_by_vpid(pid) : current;
+        if (!tsk) {
+                rcu_read_unlock();
+                return -ESRCH;
+        }
+        ret = check_prlimit_permission(tsk);
+        if (ret) {
+                rcu_read_unlock();
+                return ret;
+        }
+        get_task_struct(tsk);
+        rcu_read_unlock();
+
+        ret = do_prlimit(tsk, resource, new_rlim ? &new : NULL,
+                        old_rlim ? &old : NULL);
+
+        if (!ret && old_rlim) {
+                rlim_to_rlim64(&old, &old64);
+                if (copy_to_user(old_rlim, &old64, sizeof(old64)))
+                        ret = -EFAULT;
+        }
+
+        put_task_struct(tsk);
+        return ret;
+}
+
+SYSCALL_DEFINE2(setrlimit, unsigned int, resource, struct rlimit __user *, rlim)
+{
+        struct rlimit new_rlim;
+
+        if (copy_from_user(&new_rlim, rlim, sizeof(*rlim)))
+                return -EFAULT;
+        return do_prlimit(current, resource, &new_rlim, NULL);
+}
+
 /*
  * It would make sense to put struct rusage in the task_struct,
  * except that would make the task_struct be *really big*.  After
diff --git a/kernel/sys_ni.c b/kernel/sys_ni.c
index 70f2ea758ffe..bad369ec5403 100644
--- a/kernel/sys_ni.c
+++ b/kernel/sys_ni.c
@@ -181,3 +181,7 @@ cond_syscall(sys_eventfd2);
 
 /* performance counters: */
 cond_syscall(sys_perf_event_open);
+
+/* fanotify! */
+cond_syscall(sys_fanotify_init);
+cond_syscall(sys_fanotify_mark);
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index d24f761f4876..ca38e8e3e907 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -44,16 +44,17 @@
 #include <linux/times.h>
 #include <linux/limits.h>
 #include <linux/dcache.h>
+#include <linux/dnotify.h>
 #include <linux/syscalls.h>
 #include <linux/vmstat.h>
 #include <linux/nfs_fs.h>
 #include <linux/acpi.h>
 #include <linux/reboot.h>
 #include <linux/ftrace.h>
-#include <linux/slow-work.h>
 #include <linux/perf_event.h>
 #include <linux/kprobes.h>
 #include <linux/pipe_fs_i.h>
+#include <linux/oom.h>
 
 #include <asm/uaccess.h>
 #include <asm/processor.h>
@@ -76,15 +77,16 @@
 #include <scsi/sg.h>
 #endif
 
+#ifdef CONFIG_LOCKUP_DETECTOR
+#include <linux/nmi.h>
+#endif
+
 
 #if defined(CONFIG_SYSCTL)
 
 /* External variables not in a header file. */
 extern int sysctl_overcommit_memory;
 extern int sysctl_overcommit_ratio;
-extern int sysctl_panic_on_oom;
-extern int sysctl_oom_kill_allocating_task;
-extern int sysctl_oom_dump_tasks;
 extern int max_threads;
 extern int core_uses_pid;
 extern int suid_dumpable;
@@ -106,7 +108,7 @@ extern int blk_iopoll_enabled;
 #endif
 
 /* Constants used for minimum and  maximum */
-#ifdef CONFIG_DETECT_SOFTLOCKUP
+#ifdef CONFIG_LOCKUP_DETECTOR
 static int sixty = 60;
 static int neg_one = -1;
 #endif
@@ -130,6 +132,9 @@ static int min_percpu_pagelist_fract = 8;
 
 static int ngroups_max = NGROUPS_MAX;
 
+#ifdef CONFIG_INOTIFY_USER
+#include <linux/inotify.h>
+#endif
 #ifdef CONFIG_SPARC
 #include <asm/system.h>
 #endif
@@ -206,9 +211,6 @@ static struct ctl_table fs_table[];
 static struct ctl_table debug_table[];
 static struct ctl_table dev_table[];
 extern struct ctl_table random_table[];
-#ifdef CONFIG_INOTIFY_USER
-extern struct ctl_table inotify_table[];
-#endif
 #ifdef CONFIG_EPOLL
 extern struct ctl_table epoll_table[];
 #endif
@@ -562,7 +564,7 @@ static struct ctl_table kern_table[] = {
                 .extra2         = &one,
         },
 #endif
-#if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
+#ifdef CONFIG_HOTPLUG
         {
                 .procname       = "hotplug",
                 .data           = &uevent_helper,
@@ -710,7 +712,34 @@ static struct ctl_table kern_table[] = {
                 .mode           = 0444,
                 .proc_handler   = proc_dointvec,
         },
-#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
+#if defined(CONFIG_LOCKUP_DETECTOR)
+        {
+                .procname       = "watchdog",
+                .data           = &watchdog_enabled,
+                .maxlen         = sizeof (int),
+                .mode           = 0644,
+                .proc_handler   = proc_dowatchdog_enabled,
+        },
+        {
+                .procname       = "watchdog_thresh",
+                .data           = &softlockup_thresh,
+                .maxlen         = sizeof(int),
+                .mode           = 0644,
+                .proc_handler   = proc_dowatchdog_thresh,
+                .extra1         = &neg_one,
+                .extra2         = &sixty,
+        },
+        {
+                .procname       = "softlockup_panic",
+                .data           = &softlockup_panic,
+                .maxlen         = sizeof(int),
+                .mode           = 0644,
+                .proc_handler   = proc_dointvec_minmax,
+                .extra1         = &zero,
+                .extra2         = &one,
+        },
+#endif
+#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) && !defined(CONFIG_LOCKUP_DETECTOR)
         {
                 .procname       = "unknown_nmi_panic",
                 .data           = &unknown_nmi_panic,
@@ -813,26 +842,6 @@ static struct ctl_table kern_table[] = {
                 .proc_handler   = proc_dointvec,
         },
 #endif
-#ifdef CONFIG_DETECT_SOFTLOCKUP
-        {
-                .procname       = "softlockup_panic",
-                .data           = &softlockup_panic,
-                .maxlen         = sizeof(int),
-                .mode           = 0644,
-                .proc_handler   = proc_dointvec_minmax,
-                .extra1         = &zero,
-                .extra2         = &one,
-        },
-        {
-                .procname       = "softlockup_thresh",
-                .data           = &softlockup_thresh,
-                .maxlen         = sizeof(int),
-                .mode           = 0644,
-                .proc_handler   = proc_dosoftlockup_thresh,
-                .extra1         = &neg_one,
-                .extra2         = &sixty,
-        },
-#endif
 #ifdef CONFIG_DETECT_HUNG_TASK
         {
                 .procname       = "hung_task_panic",
@@ -906,13 +915,6 @@ static struct ctl_table kern_table[] = {
                 .proc_handler   = proc_dointvec,
         },
 #endif
-#ifdef CONFIG_SLOW_WORK
-        {
-                .procname       = "slow-work",
-                .mode           = 0555,
-                .child          = slow_work_sysctls,
-        },
-#endif
 #ifdef CONFIG_PERF_EVENTS
         {
                 .procname       = "perf_event_paranoid",
diff --git a/kernel/time.c b/kernel/time.c
index 848b1c2ab09a..ba9b338d1835 100644
--- a/kernel/time.c
+++ b/kernel/time.c
@@ -300,22 +300,6 @@ struct timespec timespec_trunc(struct timespec t, unsigned gran)
 }
 EXPORT_SYMBOL(timespec_trunc);
 
-#ifndef CONFIG_GENERIC_TIME
-/*
- * Simulate gettimeofday using do_gettimeofday which only allows a timeval
- * and therefore only yields usec accuracy
- */
-void getnstimeofday(struct timespec *tv)
-{
-        struct timeval x;
-
-        do_gettimeofday(&x);
-        tv->tv_sec = x.tv_sec;
-        tv->tv_nsec = x.tv_usec * NSEC_PER_USEC;
-}
-EXPORT_SYMBOL_GPL(getnstimeofday);
-#endif
-
 /* Converts Gregorian date to seconds since 1970-01-01 00:00:00.
  * Assumes input in normal date format, i.e. 1980-12-31 23:59:59
  * => year=1980, mon=12, day=31, hour=23, min=59, sec=59.
diff --git a/kernel/time/Kconfig b/kernel/time/Kconfig
index 95ed42951e0a..f06a8a365648 100644
--- a/kernel/time/Kconfig
+++ b/kernel/time/Kconfig
@@ -6,7 +6,7 @@ config TICK_ONESHOT
 
 config NO_HZ
         bool "Tickless System (Dynamic Ticks)"
-        depends on GENERIC_TIME && GENERIC_CLOCKEVENTS
+        depends on !ARCH_USES_GETTIMEOFFSET && GENERIC_CLOCKEVENTS
         select TICK_ONESHOT
         help
           This option enables a tickless system: timer interrupts will
@@ -15,7 +15,7 @@ config NO_HZ
 
 config HIGH_RES_TIMERS
         bool "High Resolution Timer Support"
-        depends on GENERIC_TIME && GENERIC_CLOCKEVENTS
+        depends on !ARCH_USES_GETTIMEOFFSET && GENERIC_CLOCKEVENTS
         select TICK_ONESHOT
         help
           This option enables high resolution timer support. If your
diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index f08e99c1d561..c18d7efa1b4b 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -531,7 +531,7 @@ static u64 clocksource_max_deferment(struct clocksource *cs)
         return max_nsecs - (max_nsecs >> 5);
 }
 
-#ifdef CONFIG_GENERIC_TIME
+#ifndef CONFIG_ARCH_USES_GETTIMEOFFSET
 
 /**
  * clocksource_select - Select the best clocksource available
@@ -577,7 +577,7 @@ static void clocksource_select(void)
         }
 }
 
-#else /* CONFIG_GENERIC_TIME */
+#else /* !CONFIG_ARCH_USES_GETTIMEOFFSET */
 
 static inline void clocksource_select(void) { }
 
@@ -639,19 +639,18 @@ static void clocksource_enqueue(struct clocksource *cs)
 #define MAX_UPDATE_LENGTH 5 /* Seconds */
 
 /**
- * __clocksource_register_scale - Used to install new clocksources
+ * __clocksource_updatefreq_scale - Used update clocksource with new freq
  * @t:          clocksource to be registered
  * @scale:      Scale factor multiplied against freq to get clocksource hz
  * @freq:       clocksource frequency (cycles per second) divided by scale
  *
- * Returns -EBUSY if registration fails, zero otherwise.
+ * This should only be called from the clocksource->enable() method.
  *
  * This *SHOULD NOT* be called directly! Please use the
- * clocksource_register_hz() or clocksource_register_khz helper functions.
+ * clocksource_updatefreq_hz() or clocksource_updatefreq_khz helper functions.
  */
-int __clocksource_register_scale(struct clocksource *cs, u32 scale, u32 freq)
+void __clocksource_updatefreq_scale(struct clocksource *cs, u32 scale, u32 freq)
 {
-
         /*
          * Ideally we want to use  some of the limits used in
          * clocksource_max_deferment, to provide a more informed
@@ -662,7 +661,27 @@ int __clocksource_register_scale(struct clocksource *cs, u32 scale, u32 freq)
                                       NSEC_PER_SEC/scale,
                                       MAX_UPDATE_LENGTH*scale);
         cs->max_idle_ns = clocksource_max_deferment(cs);
+}
+EXPORT_SYMBOL_GPL(__clocksource_updatefreq_scale);
+
+/**
+ * __clocksource_register_scale - Used to install new clocksources
+ * @t:          clocksource to be registered
+ * @scale:      Scale factor multiplied against freq to get clocksource hz
+ * @freq:       clocksource frequency (cycles per second) divided by scale
+ *
+ * Returns -EBUSY if registration fails, zero otherwise.
+ *
+ * This *SHOULD NOT* be called directly! Please use the
+ * clocksource_register_hz() or clocksource_register_khz helper functions.
+ */
+int __clocksource_register_scale(struct clocksource *cs, u32 scale, u32 freq)
+{
+
+        /* Intialize mult/shift and max_idle_ns */
+        __clocksource_updatefreq_scale(cs, scale, freq);
 
+        /* Add clocksource to the clcoksource list */
         mutex_lock(&clocksource_mutex);
         clocksource_enqueue(cs);
         clocksource_select();
diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c
index b3bafd5fc66d..48b2761b5668 100644
--- a/kernel/time/tick-broadcast.c
+++ b/kernel/time/tick-broadcast.c
@@ -188,7 +188,7 @@ static void tick_handle_periodic_broadcast(struct clock_event_device *dev)
         /*
          * Setup the next period for devices, which do not have
          * periodic mode. We read dev->next_event first and add to it
-         * when the event alrady expired. clockevents_program_event()
+         * when the event already expired. clockevents_program_event()
          * sets dev->next_event only when the event is really
          * programmed to the device.
          */
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 813993b5fb61..3e216e01bbd1 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -325,7 +325,7 @@ void tick_nohz_stop_sched_tick(int inidle)
         } while (read_seqretry(&xtime_lock, seq));
 
         if (rcu_needs_cpu(cpu) || printk_needs_cpu(cpu) ||
-            arch_needs_cpu(cpu) || nohz_ratelimit(cpu)) {
+            arch_needs_cpu(cpu)) {
                 next_jiffies = last_jiffies + 1;
                 delta_jiffies = 1;
         } else {
@@ -405,13 +405,7 @@ void tick_nohz_stop_sched_tick(int inidle)
                  * the scheduler tick in nohz_restart_sched_tick.
                  */
                 if (!ts->tick_stopped) {
-                        if (select_nohz_load_balancer(1)) {
-                                /*
-                                 * sched tick not stopped!
-                                 */
-                                cpumask_clear_cpu(cpu, nohz_cpu_mask);
-                                goto out;
-                        }
+                        select_nohz_load_balancer(1);
 
                         ts->idle_tick = hrtimer_get_expires(&ts->sched_timer);
                         ts->tick_stopped = 1;
@@ -780,7 +774,6 @@ void tick_setup_sched_timer(void)
 {
         struct tick_sched *ts = &__get_cpu_var(tick_cpu_sched);
         ktime_t now = ktime_get();
-        u64 offset;
 
         /*
          * Emulate tick processing via per-CPU hrtimers:
@@ -790,10 +783,6 @@ void tick_setup_sched_timer(void)
 
         /* Get the next period (per cpu) */
         hrtimer_set_expires(&ts->sched_timer, tick_init_jiffy_update());
-        offset = ktime_to_ns(tick_period) >> 1;
-        do_div(offset, num_possible_cpus());
-        offset *= smp_processor_id();
-        hrtimer_add_expires_ns(&ts->sched_timer, offset);
 
         for (;;) {
                 hrtimer_forward(&ts->sched_timer, now, tick_period);
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index caf8d4d4f5c8..49010d822f72 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -153,8 +153,8 @@ __cacheline_aligned_in_smp DEFINE_SEQLOCK(xtime_lock);
  * - wall_to_monotonic is no longer the boot time, getboottime must be
  * used instead.
  */
-struct timespec xtime __attribute__ ((aligned (16)));
-struct timespec wall_to_monotonic __attribute__ ((aligned (16)));
+static struct timespec xtime __attribute__ ((aligned (16)));
+static struct timespec wall_to_monotonic __attribute__ ((aligned (16)));
 static struct timespec total_sleep_time;
 
 /*
@@ -170,11 +170,10 @@ void timekeeping_leap_insert(int leapsecond)
 {
         xtime.tv_sec += leapsecond;
         wall_to_monotonic.tv_sec -= leapsecond;
-        update_vsyscall(&xtime, timekeeper.clock, timekeeper.mult);
+        update_vsyscall(&xtime, &wall_to_monotonic, timekeeper.clock,
+                        timekeeper.mult);
 }
 
-#ifdef CONFIG_GENERIC_TIME
-
 /**
  * timekeeping_forward_now - update clock to the current time
  *
@@ -328,7 +327,8 @@ int do_settimeofday(struct timespec *tv)
         timekeeper.ntp_error = 0;
         ntp_clear();
 
-        update_vsyscall(&xtime, timekeeper.clock, timekeeper.mult);
+        update_vsyscall(&xtime, &wall_to_monotonic, timekeeper.clock,
+                                timekeeper.mult);
 
         write_sequnlock_irqrestore(&xtime_lock, flags);
 
@@ -376,52 +376,6 @@ void timekeeping_notify(struct clocksource *clock)
         tick_clock_notify();
 }
 
-#else /* GENERIC_TIME */
-
-static inline void timekeeping_forward_now(void) { }
-
-/**
- * ktime_get - get the monotonic time in ktime_t format
- *
- * returns the time in ktime_t format
- */
-ktime_t ktime_get(void)
-{
-        struct timespec now;
-
-        ktime_get_ts(&now);
-
-        return timespec_to_ktime(now);
-}
-EXPORT_SYMBOL_GPL(ktime_get);
-
-/**
- * ktime_get_ts - get the monotonic clock in timespec format
- * @ts:         pointer to timespec variable
- *
- * The function calculates the monotonic clock from the realtime
- * clock and the wall_to_monotonic offset and stores the result
- * in normalized timespec format in the variable pointed to by @ts.
- */
-void ktime_get_ts(struct timespec *ts)
-{
-        struct timespec tomono;
-        unsigned long seq;
-
-        do {
-                seq = read_seqbegin(&xtime_lock);
-                getnstimeofday(ts);
-                tomono = wall_to_monotonic;
-
-        } while (read_seqretry(&xtime_lock, seq));
-
-        set_normalized_timespec(ts, ts->tv_sec + tomono.tv_sec,
-                                ts->tv_nsec + tomono.tv_nsec);
-}
-EXPORT_SYMBOL_GPL(ktime_get_ts);
-
-#endif /* !GENERIC_TIME */
-
 /**
  * ktime_get_real - get the real (wall-) time in ktime_t format
  *
@@ -579,9 +533,9 @@ static int timekeeping_resume(struct sys_device *dev)
 
         if (timespec_compare(&ts, &timekeeping_suspend_time) > 0) {
                 ts = timespec_sub(ts, timekeeping_suspend_time);
-                xtime = timespec_add_safe(xtime, ts);
+                xtime = timespec_add(xtime, ts);
                 wall_to_monotonic = timespec_sub(wall_to_monotonic, ts);
-                total_sleep_time = timespec_add_safe(total_sleep_time, ts);
+                total_sleep_time = timespec_add(total_sleep_time, ts);
         }
         /* re-base the last cycle value */
         timekeeper.clock->cycle_last = timekeeper.clock->read(timekeeper.clock);
@@ -736,6 +690,7 @@ static void timekeeping_adjust(s64 offset)
 static cycle_t logarithmic_accumulation(cycle_t offset, int shift)
 {
         u64 nsecps = (u64)NSEC_PER_SEC << timekeeper.shift;
+        u64 raw_nsecs;
 
         /* If the offset is smaller then a shifted interval, do nothing */
         if (offset < timekeeper.cycle_interval<<shift)
@@ -752,12 +707,15 @@ static cycle_t logarithmic_accumulation(cycle_t offset, int shift)
                 second_overflow();
         }
 
-        /* Accumulate into raw time */
-        raw_time.tv_nsec += timekeeper.raw_interval << shift;;
-        while (raw_time.tv_nsec >= NSEC_PER_SEC) {
-                raw_time.tv_nsec -= NSEC_PER_SEC;
-                raw_time.tv_sec++;
+        /* Accumulate raw time */
+        raw_nsecs = timekeeper.raw_interval << shift;
+        raw_nsecs += raw_time.tv_nsec;
+        if (raw_nsecs >= NSEC_PER_SEC) {
+                u64 raw_secs = raw_nsecs;
+                raw_nsecs = do_div(raw_secs, NSEC_PER_SEC);
+                raw_time.tv_sec += raw_secs;
         }
+        raw_time.tv_nsec = raw_nsecs;
 
         /* Accumulate error between NTP and clock interval */
         timekeeper.ntp_error += tick_length << shift;
@@ -784,10 +742,11 @@ void update_wall_time(void)
                 return;
 
         clock = timekeeper.clock;
-#ifdef CONFIG_GENERIC_TIME
-        offset = (clock->read(clock) - clock->cycle_last) & clock->mask;
-#else
+
+#ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
         offset = timekeeper.cycle_interval;
+#else
+        offset = (clock->read(clock) - clock->cycle_last) & clock->mask;
 #endif
         timekeeper.xtime_nsec = (s64)xtime.tv_nsec << timekeeper.shift;
 
@@ -856,7 +815,8 @@ void update_wall_time(void)
         }
 
         /* check to see if there is a new clocksource to use */
-        update_vsyscall(&xtime, timekeeper.clock, timekeeper.mult);
+        update_vsyscall(&xtime, &wall_to_monotonic, timekeeper.clock,
+                                timekeeper.mult);
 }
 
 /**
@@ -887,7 +847,7 @@ EXPORT_SYMBOL_GPL(getboottime);
  */
 void monotonic_to_bootbased(struct timespec *ts)
 {
-        *ts = timespec_add_safe(*ts, total_sleep_time);
+        *ts = timespec_add(*ts, total_sleep_time);
 }
 EXPORT_SYMBOL_GPL(monotonic_to_bootbased);
 
@@ -902,6 +862,11 @@ struct timespec __current_kernel_time(void)
         return xtime;
 }
 
+struct timespec __get_wall_to_monotonic(void)
+{
+        return wall_to_monotonic;
+}
+
 struct timespec current_kernel_time(void)
 {
         struct timespec now;
diff --git a/kernel/timer.c b/kernel/timer.c
index ee305c8d4e18..97bf05baade7 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -90,8 +90,13 @@ static DEFINE_PER_CPU(struct tvec_base *, tvec_bases) = &boot_tvec_bases;
 
 /*
  * Note that all tvec_bases are 2 byte aligned and lower bit of
- * base in timer_list is guaranteed to be zero. Use the LSB for
- * the new flag to indicate whether the timer is deferrable
+ * base in timer_list is guaranteed to be zero. Use the LSB to
+ * indicate whether the timer is deferrable.
+ *
+ * A deferrable timer will work normally when the system is busy, but
+ * will not cause a CPU to come out of idle just to service it; instead,
+ * the timer will be serviced when the CPU eventually wakes up with a
+ * subsequent non-deferrable timer.
  */
 #define TBASE_DEFERRABLE_FLAG           (0x1)
 
@@ -321,6 +326,7 @@ EXPORT_SYMBOL_GPL(round_jiffies_up_relative);
 
 /**
  * set_timer_slack - set the allowed slack for a timer
+ * @timer: the timer to be modified
  * @slack_hz: the amount of time (in jiffies) allowed for rounding
  *
  * Set the amount of time, in jiffies, that a certain timer has
@@ -577,6 +583,19 @@ static void __init_timer(struct timer_list *timer,
         lockdep_init_map(&timer->lockdep_map, name, key, 0);
 }
 
+void setup_deferrable_timer_on_stack_key(struct timer_list *timer,
+                                         const char *name,
+                                         struct lock_class_key *key,
+                                         void (*function)(unsigned long),
+                                         unsigned long data)
+{
+        timer->function = function;
+        timer->data = data;
+        init_timer_on_stack_key(timer, name, key);
+        timer_set_deferrable(timer);
+}
+EXPORT_SYMBOL_GPL(setup_deferrable_timer_on_stack_key);
+
 /**
  * init_timer_key - initialize a timer
  * @timer: the timer to be initialized
@@ -679,12 +698,8 @@ __mod_timer(struct timer_list *timer, unsigned long expires,
         cpu = smp_processor_id();
 
 #if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
-        if (!pinned && get_sysctl_timer_migration() && idle_cpu(cpu)) {
-                int preferred_cpu = get_nohz_load_balancer();
-
-                if (preferred_cpu >= 0)
-                        cpu = preferred_cpu;
-        }
+        if (!pinned && get_sysctl_timer_migration() && idle_cpu(cpu))
+                cpu = get_nohz_timer_target();
 #endif
         new_base = per_cpu(tvec_bases, cpu);
 
@@ -1289,7 +1304,6 @@ void run_local_timers(void)
 {
         hrtimer_run_queues();
         raise_softirq(TIMER_SOFTIRQ);
-        softlockup_tick();
 }
 
 /*
@@ -1750,3 +1764,25 @@ unsigned long msleep_interruptible(unsigned int msecs)
 }
 
 EXPORT_SYMBOL(msleep_interruptible);
+
+static int __sched do_usleep_range(unsigned long min, unsigned long max)
+{
+        ktime_t kmin;
+        unsigned long delta;
+
+        kmin = ktime_set(0, min * NSEC_PER_USEC);
+        delta = (max - min) * NSEC_PER_USEC;
+        return schedule_hrtimeout_range(&kmin, delta, HRTIMER_MODE_REL);
+}
+
+/**
+ * usleep_range - Drop in replacement for udelay where wakeup is flexible
+ * @min: Minimum time in usecs to sleep
+ * @max: Maximum time in usecs to sleep
+ */
+void usleep_range(unsigned long min, unsigned long max)
+{
+        __set_current_state(TASK_UNINTERRUPTIBLE);
+        do_usleep_range(min, max);
+}
+EXPORT_SYMBOL(usleep_range);
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index 8b1797c4545b..538501c6ea50 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -153,7 +153,7 @@ config IRQSOFF_TRACER
         bool "Interrupts-off Latency Tracer"
         default n
         depends on TRACE_IRQFLAGS_SUPPORT
-        depends on GENERIC_TIME
+        depends on !ARCH_USES_GETTIMEOFFSET
         select TRACE_IRQFLAGS
         select GENERIC_TRACER
         select TRACER_MAX_TRACE
@@ -175,7 +175,7 @@ config IRQSOFF_TRACER
 config PREEMPT_TRACER
         bool "Preemption-off Latency Tracer"
         default n
-        depends on GENERIC_TIME
+        depends on !ARCH_USES_GETTIMEOFFSET
         depends on PREEMPT
         select GENERIC_TRACER
         select TRACER_MAX_TRACE
@@ -194,15 +194,6 @@ config PREEMPT_TRACER
           enabled. This option and the irqs-off timing option can be
           used together or separately.)
 
-config SYSPROF_TRACER
-        bool "Sysprof Tracer"
-        depends on X86
-        select GENERIC_TRACER
-        select CONTEXT_SWITCH_TRACER
-        help
-          This tracer provides the trace needed by the 'Sysprof' userspace
-          tool.
-
 config SCHED_TRACER
         bool "Scheduling Latency Tracer"
         select GENERIC_TRACER
@@ -229,23 +220,6 @@ config FTRACE_SYSCALLS
         help
           Basic tracer to catch the syscall entry and exit events.
 
-config BOOT_TRACER
-        bool "Trace boot initcalls"
-        select GENERIC_TRACER
-        select CONTEXT_SWITCH_TRACER
-        help
-          This tracer helps developers to optimize boot times: it records
-          the timings of the initcalls and traces key events and the identity
-          of tasks that can cause boot delays, such as context-switches.
-
-          Its aim is to be parsed by the scripts/bootgraph.pl tool to
-          produce pretty graphics about boot inefficiencies, giving a visual
-          representation of the delays during initcalls - but the raw
-          /debug/tracing/trace text output is readable too.
-
-          You must pass in initcall_debug and ftrace=initcall to the kernel
-          command line to enable this on bootup.
-
 config TRACE_BRANCH_PROFILING
         bool
         select GENERIC_TRACER
@@ -325,28 +299,6 @@ config BRANCH_TRACER
 
           Say N if unsure.
 
-config KSYM_TRACER
-        bool "Trace read and write access on kernel memory locations"
-        depends on HAVE_HW_BREAKPOINT
-        select TRACING
-        help
-          This tracer helps find read and write operations on any given kernel
-          symbol i.e. /proc/kallsyms.
-
-config PROFILE_KSYM_TRACER
-        bool "Profile all kernel memory accesses on 'watched' variables"
-        depends on KSYM_TRACER
-        help
-          This tracer profiles kernel accesses on variables watched through the
-          ksym tracer ftrace plugin. Depending upon the hardware, all read
-          and write operations on kernel variables can be monitored for
-          accesses.
-
-          The results will be displayed in:
-          /debugfs/tracing/profile_ksym
-
-          Say N if unsure.
-
 config STACK_TRACER
         bool "Trace max stack"
         depends on HAVE_FUNCTION_TRACER
@@ -371,37 +323,6 @@ config STACK_TRACER
 
           Say N if unsure.
 
-config KMEMTRACE
-        bool "Trace SLAB allocations"
-        select GENERIC_TRACER
-        help
-          kmemtrace provides tracing for slab allocator functions, such as
-          kmalloc, kfree, kmem_cache_alloc, kmem_cache_free, etc. Collected
-          data is then fed to the userspace application in order to analyse
-          allocation hotspots, internal fragmentation and so on, making it
-          possible to see how well an allocator performs, as well as debug
-          and profile kernel code.
-
-          This requires an userspace application to use. See
-          Documentation/trace/kmemtrace.txt for more information.
-
-          Saying Y will make the kernel somewhat larger and slower. However,
-          if you disable kmemtrace at run-time or boot-time, the performance
-          impact is minimal (depending on the arch the kernel is built for).
-
-          If unsure, say N.
-
-config WORKQUEUE_TRACER
-        bool "Trace workqueues"
-        select GENERIC_TRACER
-        help
-          The workqueue tracer provides some statistical information
-          about each cpu workqueue thread such as the number of the
-          works inserted and executed since their creation. It can help
-          to evaluate the amount of work each of them has to perform.
-          For example it can help a developer to decide whether he should
-          choose a per-cpu workqueue instead of a singlethreaded one.
-
 config BLK_DEV_IO_TRACE
         bool "Support for tracing block IO actions"
         depends on SYSFS
diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile
index ffb1a5b0550e..53f338190b26 100644
--- a/kernel/trace/Makefile
+++ b/kernel/trace/Makefile
@@ -30,7 +30,6 @@ obj-$(CONFIG_TRACING) += trace_output.o
 obj-$(CONFIG_TRACING) += trace_stat.o
 obj-$(CONFIG_TRACING) += trace_printk.o
 obj-$(CONFIG_CONTEXT_SWITCH_TRACER) += trace_sched_switch.o
-obj-$(CONFIG_SYSPROF_TRACER) += trace_sysprof.o
 obj-$(CONFIG_FUNCTION_TRACER) += trace_functions.o
 obj-$(CONFIG_IRQSOFF_TRACER) += trace_irqsoff.o
 obj-$(CONFIG_PREEMPT_TRACER) += trace_irqsoff.o
@@ -38,10 +37,8 @@ obj-$(CONFIG_SCHED_TRACER) += trace_sched_wakeup.o
 obj-$(CONFIG_NOP_TRACER) += trace_nop.o
 obj-$(CONFIG_STACK_TRACER) += trace_stack.o
 obj-$(CONFIG_MMIOTRACE) += trace_mmiotrace.o
-obj-$(CONFIG_BOOT_TRACER) += trace_boot.o
 obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += trace_functions_graph.o
 obj-$(CONFIG_TRACE_BRANCH_PROFILING) += trace_branch.o
-obj-$(CONFIG_KMEMTRACE) += kmemtrace.o
 obj-$(CONFIG_WORKQUEUE_TRACER) += trace_workqueue.o
 obj-$(CONFIG_BLK_DEV_IO_TRACE) += blktrace.o
 ifeq ($(CONFIG_BLOCK),y)
@@ -55,7 +52,9 @@ obj-$(CONFIG_EVENT_TRACING) += trace_event_perf.o
 endif
 obj-$(CONFIG_EVENT_TRACING) += trace_events_filter.o
 obj-$(CONFIG_KPROBE_EVENT) += trace_kprobe.o
-obj-$(CONFIG_KSYM_TRACER) += trace_ksym.o
 obj-$(CONFIG_EVENT_TRACING) += power-traces.o
+ifeq ($(CONFIG_TRACING),y)
+obj-$(CONFIG_KGDB_KDB) += trace_kdb.o
+endif
 
 libftrace-y := ftrace.o
diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index 638711c17504..959f8d6c8cc1 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -169,9 +169,12 @@ static int act_log_check(struct blk_trace *bt, u32 what, sector_t sector,
 static const u32 ddir_act[2] = { BLK_TC_ACT(BLK_TC_READ),
                                  BLK_TC_ACT(BLK_TC_WRITE) };
 
+#define BLK_TC_HARDBARRIER      BLK_TC_BARRIER
+#define BLK_TC_RAHEAD           BLK_TC_AHEAD
+
 /* The ilog2() calls fall out because they're constant */
-#define MASK_TC_BIT(rw, __name) ((rw & (1 << BIO_RW_ ## __name)) << \
-          (ilog2(BLK_TC_ ## __name) + BLK_TC_SHIFT - BIO_RW_ ## __name))
+#define MASK_TC_BIT(rw, __name) ((rw & REQ_ ## __name) << \
+          (ilog2(BLK_TC_ ## __name) + BLK_TC_SHIFT - __REQ_ ## __name))
 
 /*
  * The worker for the various blk_add_trace*() types. Fills out a
@@ -194,9 +197,9 @@ static void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes,
                 return;
 
         what |= ddir_act[rw & WRITE];
-        what |= MASK_TC_BIT(rw, BARRIER);
-        what |= MASK_TC_BIT(rw, SYNCIO);
-        what |= MASK_TC_BIT(rw, AHEAD);
+        what |= MASK_TC_BIT(rw, HARDBARRIER);
+        what |= MASK_TC_BIT(rw, SYNC);
+        what |= MASK_TC_BIT(rw, RAHEAD);
         what |= MASK_TC_BIT(rw, META);
         what |= MASK_TC_BIT(rw, DISCARD);
 
@@ -549,6 +552,41 @@ int blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
 }
 EXPORT_SYMBOL_GPL(blk_trace_setup);
 
+#if defined(CONFIG_COMPAT) && defined(CONFIG_X86_64)
+static int compat_blk_trace_setup(struct request_queue *q, char *name,
+                                  dev_t dev, struct block_device *bdev,
+                                  char __user *arg)
+{
+        struct blk_user_trace_setup buts;
+        struct compat_blk_user_trace_setup cbuts;
+        int ret;
+
+        if (copy_from_user(&cbuts, arg, sizeof(cbuts)))
+                return -EFAULT;
+
+        buts = (struct blk_user_trace_setup) {
+                .act_mask = cbuts.act_mask,
+                .buf_size = cbuts.buf_size,
+                .buf_nr = cbuts.buf_nr,
+                .start_lba = cbuts.start_lba,
+                .end_lba = cbuts.end_lba,
+                .pid = cbuts.pid,
+        };
+        memcpy(&buts.name, &cbuts.name, 32);
+
+        ret = do_blk_trace_setup(q, name, dev, bdev, &buts);
+        if (ret)
+                return ret;
+
+        if (copy_to_user(arg, &buts.name, 32)) {
+                blk_trace_remove(q);
+                return -EFAULT;
+        }
+
+        return 0;
+}
+#endif
+
 int blk_trace_startstop(struct request_queue *q, int start)
 {
         int ret;
@@ -601,6 +639,7 @@ int blk_trace_ioctl(struct block_device *bdev, unsigned cmd, char __user *arg)
         if (!q)
                 return -ENXIO;
 
+        lock_kernel();
         mutex_lock(&bdev->bd_mutex);
 
         switch (cmd) {
@@ -608,6 +647,12 @@ int blk_trace_ioctl(struct block_device *bdev, unsigned cmd, char __user *arg)
                 bdevname(bdev, b);
                 ret = blk_trace_setup(q, b, bdev->bd_dev, bdev, arg);
                 break;
+#if defined(CONFIG_COMPAT) && defined(CONFIG_X86_64)
+        case BLKTRACESETUP32:
+                bdevname(bdev, b);
+                ret = compat_blk_trace_setup(q, b, bdev->bd_dev, bdev, arg);
+                break;
+#endif
         case BLKTRACESTART:
                 start = 1;
         case BLKTRACESTOP:
@@ -622,6 +667,7 @@ int blk_trace_ioctl(struct block_device *bdev, unsigned cmd, char __user *arg)
         }
 
         mutex_unlock(&bdev->bd_mutex);
+        unlock_kernel();
         return ret;
 }
 
@@ -661,10 +707,13 @@ static void blk_add_trace_rq(struct request_queue *q, struct request *rq,
         if (likely(!bt))
                 return;
 
-        if (blk_discard_rq(rq))
-                rw |= (1 << BIO_RW_DISCARD);
+        if (rq->cmd_flags & REQ_DISCARD)
+                rw |= REQ_DISCARD;
+
+        if (rq->cmd_flags & REQ_SECURE)
+                rw |= REQ_SECURE;
 
-        if (blk_pc_request(rq)) {
+        if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
                 what |= BLK_TC_ACT(BLK_TC_PC);
                 __blk_add_trace(bt, 0, blk_rq_bytes(rq), rw,
                                 what, rq->errors, rq->cmd_len, rq->cmd);
@@ -925,7 +974,7 @@ void blk_add_driver_data(struct request_queue *q,
         if (likely(!bt))
                 return;
 
-        if (blk_pc_request(rq))
+        if (rq->cmd_type == REQ_TYPE_BLOCK_PC)
                 __blk_add_trace(bt, 0, blk_rq_bytes(rq), 0,
                                 BLK_TA_DRV_DATA, rq->errors, len, data);
         else
@@ -1730,7 +1779,7 @@ void blk_dump_cmd(char *buf, struct request *rq)
         int len = rq->cmd_len;
         unsigned char *cmd = rq->cmd;
 
-        if (!blk_pc_request(rq)) {
+        if (rq->cmd_type != REQ_TYPE_BLOCK_PC) {
                 buf[0] = '\0';
                 return;
         }
@@ -1755,21 +1804,23 @@ void blk_fill_rwbs(char *rwbs, u32 rw, int bytes)
 
         if (rw & WRITE)
                 rwbs[i++] = 'W';
-        else if (rw & 1 << BIO_RW_DISCARD)
+        else if (rw & REQ_DISCARD)
                 rwbs[i++] = 'D';
         else if (bytes)
                 rwbs[i++] = 'R';
         else
                 rwbs[i++] = 'N';
 
-        if (rw & 1 << BIO_RW_AHEAD)
+        if (rw & REQ_RAHEAD)
                 rwbs[i++] = 'A';
-        if (rw & 1 << BIO_RW_BARRIER)
+        if (rw & REQ_HARDBARRIER)
                 rwbs[i++] = 'B';
-        if (rw & 1 << BIO_RW_SYNCIO)
+        if (rw & REQ_SYNC)
                 rwbs[i++] = 'S';
-        if (rw & 1 << BIO_RW_META)
+        if (rw & REQ_META)
                 rwbs[i++] = 'M';
+        if (rw & REQ_SECURE)
+                rwbs[i++] = 'E';
 
         rwbs[i] = '\0';
 }
@@ -1779,8 +1830,11 @@ void blk_fill_rwbs_rq(char *rwbs, struct request *rq)
         int rw = rq->cmd_flags & 0x03;
         int bytes;
 
-        if (blk_discard_rq(rq))
-                rw |= (1 << BIO_RW_DISCARD);
+        if (rq->cmd_flags & REQ_DISCARD)
+                rw |= REQ_DISCARD;
+
+        if (rq->cmd_flags & REQ_SECURE)
+                rw |= REQ_SECURE;
 
         bytes = blk_rq_bytes(rq);
 
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 6d2cb14f9449..0d88ce9b9fb8 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -1883,7 +1883,6 @@ function_trace_probe_call(unsigned long ip, unsigned long parent_ip)
         struct hlist_head *hhd;
         struct hlist_node *n;
         unsigned long key;
-        int resched;
 
         key = hash_long(ip, FTRACE_HASH_BITS);
 
@@ -1897,12 +1896,12 @@ function_trace_probe_call(unsigned long ip, unsigned long parent_ip)
          * period. This syncs the hash iteration and freeing of items
          * on the hash. rcu_read_lock is too dangerous here.
          */
-        resched = ftrace_preempt_disable();
+        preempt_disable_notrace();
         hlist_for_each_entry_rcu(entry, n, hhd, node) {
                 if (entry->ip == ip)
                         entry->ops->func(ip, parent_ip, &entry->data);
         }
-        ftrace_preempt_enable(resched);
+        preempt_enable_notrace();
 }
 
 static struct ftrace_ops trace_probe_ops __read_mostly =
diff --git a/kernel/trace/kmemtrace.c b/kernel/trace/kmemtrace.c
deleted file mode 100644
index bbfc1bb1660b..000000000000
--- a/kernel/trace/kmemtrace.c
+++ /dev/null
@@ -1,529 +0,0 @@
-/*
- * Memory allocator tracing
- *
- * Copyright (C) 2008 Eduard - Gabriel Munteanu
- * Copyright (C) 2008 Pekka Enberg <penberg@cs.helsinki.fi>
- * Copyright (C) 2008 Frederic Weisbecker <fweisbec@gmail.com>
- */
-
-#include <linux/tracepoint.h>
-#include <linux/seq_file.h>
-#include <linux/debugfs.h>
-#include <linux/dcache.h>
-#include <linux/fs.h>
-
-#include <linux/kmemtrace.h>
-
-#include "trace_output.h"
-#include "trace.h"
-
-/* Select an alternative, minimalistic output than the original one */
-#define TRACE_KMEM_OPT_MINIMAL  0x1
-
-static struct tracer_opt kmem_opts[] = {
-        /* Default disable the minimalistic output */
-        { TRACER_OPT(kmem_minimalistic, TRACE_KMEM_OPT_MINIMAL) },
-        { }
-};
-
-static struct tracer_flags kmem_tracer_flags = {
-        .val                    = 0,
-        .opts                   = kmem_opts
-};
-
-static struct trace_array *kmemtrace_array;
-
-/* Trace allocations */
-static inline void kmemtrace_alloc(enum kmemtrace_type_id type_id,
-                                   unsigned long call_site,
-                                   const void *ptr,
-                                   size_t bytes_req,
-                                   size_t bytes_alloc,
-                                   gfp_t gfp_flags,
-                                   int node)
-{
-        struct ftrace_event_call *call = &event_kmem_alloc;
-        struct trace_array *tr = kmemtrace_array;
-        struct kmemtrace_alloc_entry *entry;
-        struct ring_buffer_event *event;
-
-        event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry));
-        if (!event)
-                return;
-
-        entry = ring_buffer_event_data(event);
-        tracing_generic_entry_update(&entry->ent, 0, 0);
-
-        entry->ent.type         = TRACE_KMEM_ALLOC;
-        entry->type_id          = type_id;
-        entry->call_site        = call_site;
-        entry->ptr              = ptr;
-        entry->bytes_req        = bytes_req;
-        entry->bytes_alloc      = bytes_alloc;
-        entry->gfp_flags        = gfp_flags;
-        entry->node             = node;
-
-        if (!filter_check_discard(call, entry, tr->buffer, event))
-                ring_buffer_unlock_commit(tr->buffer, event);
-
-        trace_wake_up();
-}
-
-static inline void kmemtrace_free(enum kmemtrace_type_id type_id,
-                                  unsigned long call_site,
-                                  const void *ptr)
-{
-        struct ftrace_event_call *call = &event_kmem_free;
-        struct trace_array *tr = kmemtrace_array;
-        struct kmemtrace_free_entry *entry;
-        struct ring_buffer_event *event;
-
-        event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry));
-        if (!event)
-                return;
-        entry   = ring_buffer_event_data(event);
-        tracing_generic_entry_update(&entry->ent, 0, 0);
-
-        entry->ent.type         = TRACE_KMEM_FREE;
-        entry->type_id          = type_id;
-        entry->call_site        = call_site;
-        entry->ptr              = ptr;
-
-        if (!filter_check_discard(call, entry, tr->buffer, event))
-                ring_buffer_unlock_commit(tr->buffer, event);
-
-        trace_wake_up();
-}
-
-static void kmemtrace_kmalloc(void *ignore,
-                              unsigned long call_site,
-                              const void *ptr,
-                              size_t bytes_req,
-                              size_t bytes_alloc,
-                              gfp_t gfp_flags)
-{
-        kmemtrace_alloc(KMEMTRACE_TYPE_KMALLOC, call_site, ptr,
-                        bytes_req, bytes_alloc, gfp_flags, -1);
-}
-
-static void kmemtrace_kmem_cache_alloc(void *ignore,
-                                       unsigned long call_site,
-                                       const void *ptr,
-                                       size_t bytes_req,
-                                       size_t bytes_alloc,
-                                       gfp_t gfp_flags)
-{
-        kmemtrace_alloc(KMEMTRACE_TYPE_CACHE, call_site, ptr,
-                        bytes_req, bytes_alloc, gfp_flags, -1);
-}
-
-static void kmemtrace_kmalloc_node(void *ignore,
-                                   unsigned long call_site,
-                                   const void *ptr,
-                                   size_t bytes_req,
-                                   size_t bytes_alloc,
-                                   gfp_t gfp_flags,
-                                   int node)
-{
-        kmemtrace_alloc(KMEMTRACE_TYPE_KMALLOC, call_site, ptr,
-                        bytes_req, bytes_alloc, gfp_flags, node);
-}
-
-static void kmemtrace_kmem_cache_alloc_node(void *ignore,
-                                            unsigned long call_site,
-                                            const void *ptr,
-                                            size_t bytes_req,
-                                            size_t bytes_alloc,
-                                            gfp_t gfp_flags,
-                                            int node)
-{
-        kmemtrace_alloc(KMEMTRACE_TYPE_CACHE, call_site, ptr,
-                        bytes_req, bytes_alloc, gfp_flags, node);
-}
-
-static void
-kmemtrace_kfree(void *ignore, unsigned long call_site, const void *ptr)
-{
-        kmemtrace_free(KMEMTRACE_TYPE_KMALLOC, call_site, ptr);
-}
-
-static void kmemtrace_kmem_cache_free(void *ignore,
-                                      unsigned long call_site, const void *ptr)
-{
-        kmemtrace_free(KMEMTRACE_TYPE_CACHE, call_site, ptr);
-}
-
-static int kmemtrace_start_probes(void)
-{
-        int err;
-
-        err = register_trace_kmalloc(kmemtrace_kmalloc, NULL);
-        if (err)
-                return err;
-        err = register_trace_kmem_cache_alloc(kmemtrace_kmem_cache_alloc, NULL);
-        if (err)
-                return err;
-        err = register_trace_kmalloc_node(kmemtrace_kmalloc_node, NULL);
-        if (err)
-                return err;
-        err = register_trace_kmem_cache_alloc_node(kmemtrace_kmem_cache_alloc_node, NULL);
-        if (err)
-                return err;
-        err = register_trace_kfree(kmemtrace_kfree, NULL);
-        if (err)
-                return err;
-        err = register_trace_kmem_cache_free(kmemtrace_kmem_cache_free, NULL);
-
-        return err;
-}
-
-static void kmemtrace_stop_probes(void)
-{
-        unregister_trace_kmalloc(kmemtrace_kmalloc, NULL);
-        unregister_trace_kmem_cache_alloc(kmemtrace_kmem_cache_alloc, NULL);
-        unregister_trace_kmalloc_node(kmemtrace_kmalloc_node, NULL);
-        unregister_trace_kmem_cache_alloc_node(kmemtrace_kmem_cache_alloc_node, NULL);
-        unregister_trace_kfree(kmemtrace_kfree, NULL);
-        unregister_trace_kmem_cache_free(kmemtrace_kmem_cache_free, NULL);
-}
-
-static int kmem_trace_init(struct trace_array *tr)
-{
-        kmemtrace_array = tr;
-
-        tracing_reset_online_cpus(tr);
-
-        kmemtrace_start_probes();
-
-        return 0;
-}
-
-static void kmem_trace_reset(struct trace_array *tr)
-{
-        kmemtrace_stop_probes();
-}
-
-static void kmemtrace_headers(struct seq_file *s)
-{
-        /* Don't need headers for the original kmemtrace output */
-        if (!(kmem_tracer_flags.val & TRACE_KMEM_OPT_MINIMAL))
-                return;
-
-        seq_printf(s, "#\n");
-        seq_printf(s, "# ALLOC  TYPE  REQ   GIVEN  FLAGS     "
-                        "      POINTER         NODE    CALLER\n");
-        seq_printf(s, "# FREE   |      |     |       |       "
-                        "       |   |            |        |\n");
-        seq_printf(s, "# |\n\n");
-}
-
-/*
- * The following functions give the original output from kmemtrace,
- * plus the origin CPU, since reordering occurs in-kernel now.
- */
-
-#define KMEMTRACE_USER_ALLOC    0
-#define KMEMTRACE_USER_FREE     1
-
-struct kmemtrace_user_event {
-        u8                      event_id;
-        u8                      type_id;
-        u16                     event_size;
-        u32                     cpu;
-        u64                     timestamp;
-        unsigned long           call_site;
-        unsigned long           ptr;
-};
-
-struct kmemtrace_user_event_alloc {
-        size_t                  bytes_req;
-        size_t                  bytes_alloc;
-        unsigned                gfp_flags;
-        int                     node;
-};
-
-static enum print_line_t
-kmemtrace_print_alloc(struct trace_iterator *iter, int flags,
-                      struct trace_event *event)
-{
-        struct trace_seq *s = &iter->seq;
-        struct kmemtrace_alloc_entry *entry;
-        int ret;
-
-        trace_assign_type(entry, iter->ent);
-
-        ret = trace_seq_printf(s, "type_id %d call_site %pF ptr %lu "
-            "bytes_req %lu bytes_alloc %lu gfp_flags %lu node %d\n",
-            entry->type_id, (void *)entry->call_site, (unsigned long)entry->ptr,
-            (unsigned long)entry->bytes_req, (unsigned long)entry->bytes_alloc,
-            (unsigned long)entry->gfp_flags, entry->node);
-
-        if (!ret)
-                return TRACE_TYPE_PARTIAL_LINE;
-        return TRACE_TYPE_HANDLED;
-}
-
-static enum print_line_t
-kmemtrace_print_free(struct trace_iterator *iter, int flags,
-                     struct trace_event *event)
-{
-        struct trace_seq *s = &iter->seq;
-        struct kmemtrace_free_entry *entry;
-        int ret;
-
-        trace_assign_type(entry, iter->ent);
-
-        ret = trace_seq_printf(s, "type_id %d call_site %pF ptr %lu\n",
-                               entry->type_id, (void *)entry->call_site,
-                               (unsigned long)entry->ptr);
-
-        if (!ret)
-                return TRACE_TYPE_PARTIAL_LINE;
-        return TRACE_TYPE_HANDLED;
-}
-
-static enum print_line_t
-kmemtrace_print_alloc_user(struct trace_iterator *iter, int flags,
-                           struct trace_event *event)
-{
-        struct trace_seq *s = &iter->seq;
-        struct kmemtrace_alloc_entry *entry;
-        struct kmemtrace_user_event *ev;
-        struct kmemtrace_user_event_alloc *ev_alloc;
-
-        trace_assign_type(entry, iter->ent);
-
-        ev = trace_seq_reserve(s, sizeof(*ev));
-        if (!ev)
-                return TRACE_TYPE_PARTIAL_LINE;
-
-        ev->event_id            = KMEMTRACE_USER_ALLOC;
-        ev->type_id             = entry->type_id;
-        ev->event_size          = sizeof(*ev) + sizeof(*ev_alloc);
-        ev->cpu                 = iter->cpu;
-        ev->timestamp           = iter->ts;
-        ev->call_site           = entry->call_site;
-        ev->ptr                 = (unsigned long)entry->ptr;
-
-        ev_alloc = trace_seq_reserve(s, sizeof(*ev_alloc));
-        if (!ev_alloc)
-                return TRACE_TYPE_PARTIAL_LINE;
-
-        ev_alloc->bytes_req     = entry->bytes_req;
-        ev_alloc->bytes_alloc   = entry->bytes_alloc;
-        ev_alloc->gfp_flags     = entry->gfp_flags;
-        ev_alloc->node          = entry->node;
-
-        return TRACE_TYPE_HANDLED;
-}
-
-static enum print_line_t
-kmemtrace_print_free_user(struct trace_iterator *iter, int flags,
-                          struct trace_event *event)
-{
-        struct trace_seq *s = &iter->seq;
-        struct kmemtrace_free_entry *entry;
-        struct kmemtrace_user_event *ev;
-
-        trace_assign_type(entry, iter->ent);
-
-        ev = trace_seq_reserve(s, sizeof(*ev));
-        if (!ev)
-                return TRACE_TYPE_PARTIAL_LINE;
-
-        ev->event_id            = KMEMTRACE_USER_FREE;
-        ev->type_id             = entry->type_id;
-        ev->event_size          = sizeof(*ev);
-        ev->cpu                 = iter->cpu;
-        ev->timestamp           = iter->ts;
-        ev->call_site           = entry->call_site;
-        ev->ptr                 = (unsigned long)entry->ptr;
-
-        return TRACE_TYPE_HANDLED;
-}
-
-/* The two other following provide a more minimalistic output */
-static enum print_line_t
-kmemtrace_print_alloc_compress(struct trace_iterator *iter)
-{
-        struct kmemtrace_alloc_entry *entry;
-        struct trace_seq *s = &iter->seq;
-        int ret;
-
-        trace_assign_type(entry, iter->ent);
-
-        /* Alloc entry */
-        ret = trace_seq_printf(s, "  +      ");
-        if (!ret)
-                return TRACE_TYPE_PARTIAL_LINE;
-
-        /* Type */
-        switch (entry->type_id) {
-        case KMEMTRACE_TYPE_KMALLOC:
-                ret = trace_seq_printf(s, "K   ");
-                break;
-        case KMEMTRACE_TYPE_CACHE:
-                ret = trace_seq_printf(s, "C   ");
-                break;
-        case KMEMTRACE_TYPE_PAGES:
-                ret = trace_seq_printf(s, "P   ");
-                break;
-        default:
-                ret = trace_seq_printf(s, "?   ");
-        }
-
-        if (!ret)
-                return TRACE_TYPE_PARTIAL_LINE;
-
-        /* Requested */
-        ret = trace_seq_printf(s, "%4zu   ", entry->bytes_req);
-        if (!ret)
-                return TRACE_TYPE_PARTIAL_LINE;
-
-        /* Allocated */
-        ret = trace_seq_printf(s, "%4zu   ", entry->bytes_alloc);
-        if (!ret)
-                return TRACE_TYPE_PARTIAL_LINE;
-
-        /* Flags
-         * TODO: would be better to see the name of the GFP flag names
-         */
-        ret = trace_seq_printf(s, "%08x   ", entry->gfp_flags);
-        if (!ret)
-                return TRACE_TYPE_PARTIAL_LINE;
-
-        /* Pointer to allocated */
-        ret = trace_seq_printf(s, "0x%tx   ", (ptrdiff_t)entry->ptr);
-        if (!ret)
-                return TRACE_TYPE_PARTIAL_LINE;
-
-        /* Node and call site*/
-        ret = trace_seq_printf(s, "%4d   %pf\n", entry->node,
-                                                 (void *)entry->call_site);
-        if (!ret)
-                return TRACE_TYPE_PARTIAL_LINE;
-
-        return TRACE_TYPE_HANDLED;
-}
-
-static enum print_line_t
-kmemtrace_print_free_compress(struct trace_iterator *iter)
-{
-        struct kmemtrace_free_entry *entry;
-        struct trace_seq *s = &iter->seq;
-        int ret;
-
-        trace_assign_type(entry, iter->ent);
-
-        /* Free entry */
-        ret = trace_seq_printf(s, "  -      ");
-        if (!ret)
-                return TRACE_TYPE_PARTIAL_LINE;
-
-        /* Type */
-        switch (entry->type_id) {
-        case KMEMTRACE_TYPE_KMALLOC:
-                ret = trace_seq_printf(s, "K     ");
-                break;
-        case KMEMTRACE_TYPE_CACHE:
-                ret = trace_seq_printf(s, "C     ");
-                break;
-        case KMEMTRACE_TYPE_PAGES:
-                ret = trace_seq_printf(s, "P     ");
-                break;
-        default:
-                ret = trace_seq_printf(s, "?     ");
-        }
-
-        if (!ret)
-                return TRACE_TYPE_PARTIAL_LINE;
-
-        /* Skip requested/allocated/flags */
-        ret = trace_seq_printf(s, "                       ");
-        if (!ret)
-                return TRACE_TYPE_PARTIAL_LINE;
-
-        /* Pointer to allocated */
-        ret = trace_seq_printf(s, "0x%tx   ", (ptrdiff_t)entry->ptr);
-        if (!ret)
-                return TRACE_TYPE_PARTIAL_LINE;
-
-        /* Skip node and print call site*/
-        ret = trace_seq_printf(s, "       %pf\n", (void *)entry->call_site);
-        if (!ret)
-                return TRACE_TYPE_PARTIAL_LINE;
-
-        return TRACE_TYPE_HANDLED;
-}
-
-static enum print_line_t kmemtrace_print_line(struct trace_iterator *iter)
-{
-        struct trace_entry *entry = iter->ent;
-
-        if (!(kmem_tracer_flags.val & TRACE_KMEM_OPT_MINIMAL))
-                return TRACE_TYPE_UNHANDLED;
-
-        switch (entry->type) {
-        case TRACE_KMEM_ALLOC:
-                return kmemtrace_print_alloc_compress(iter);
-        case TRACE_KMEM_FREE:
-                return kmemtrace_print_free_compress(iter);
-        default:
-                return TRACE_TYPE_UNHANDLED;
-        }
-}
-
-static struct trace_event_functions kmem_trace_alloc_funcs = {
-        .trace                  = kmemtrace_print_alloc,
-        .binary                 = kmemtrace_print_alloc_user,
-};
-
-static struct trace_event kmem_trace_alloc = {
-        .type                   = TRACE_KMEM_ALLOC,
-        .funcs                  = &kmem_trace_alloc_funcs,
-};
-
-static struct trace_event_functions kmem_trace_free_funcs = {
-        .trace                  = kmemtrace_print_free,
-        .binary                 = kmemtrace_print_free_user,
-};
-
-static struct trace_event kmem_trace_free = {
-        .type                   = TRACE_KMEM_FREE,
-        .funcs                  = &kmem_trace_free_funcs,
-};
-
-static struct tracer kmem_tracer __read_mostly = {
-        .name                   = "kmemtrace",
-        .init                   = kmem_trace_init,
-        .reset                  = kmem_trace_reset,
-        .print_line             = kmemtrace_print_line,
-        .print_header           = kmemtrace_headers,
-        .flags                  = &kmem_tracer_flags
-};
-
-void kmemtrace_init(void)
-{
-        /* earliest opportunity to start kmem tracing */
-}
-
-static int __init init_kmem_tracer(void)
-{
-        if (!register_ftrace_event(&kmem_trace_alloc)) {
-                pr_warning("Warning: could not register kmem events\n");
-                return 1;
-        }
-
-        if (!register_ftrace_event(&kmem_trace_free)) {
-                pr_warning("Warning: could not register kmem events\n");
-                return 1;
-        }
-
-        if (register_tracer(&kmem_tracer) != 0) {
-                pr_warning("Warning: could not register the kmem tracer\n");
-                return 1;
-        }
-
-        return 0;
-}
-device_initcall(init_kmem_tracer);
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index 1da7b6ea8b85..19cccc3c3028 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -443,6 +443,7 @@ int ring_buffer_print_page_header(struct trace_seq *s)
  */
 struct ring_buffer_per_cpu {
         int                             cpu;
+        atomic_t                        record_disabled;
         struct ring_buffer              *buffer;
         spinlock_t                      reader_lock;    /* serialize readers */
         arch_spinlock_t                 lock;
@@ -462,7 +463,6 @@ struct ring_buffer_per_cpu {
         unsigned long                   read;
         u64                             write_stamp;
         u64                             read_stamp;
-        atomic_t                        record_disabled;
 };
 
 struct ring_buffer {
@@ -2242,8 +2242,6 @@ static void trace_recursive_unlock(void)
 
 #endif
 
-static DEFINE_PER_CPU(int, rb_need_resched);
-
 /**
  * ring_buffer_lock_reserve - reserve a part of the buffer
  * @buffer: the ring buffer to reserve from
@@ -2264,13 +2262,13 @@ ring_buffer_lock_reserve(struct ring_buffer *buffer, unsigned long length)
 {
         struct ring_buffer_per_cpu *cpu_buffer;
         struct ring_buffer_event *event;
-        int cpu, resched;
+        int cpu;
 
         if (ring_buffer_flags != RB_BUFFERS_ON)
                 return NULL;
 
         /* If we are tracing schedule, we don't want to recurse */
-        resched = ftrace_preempt_disable();
+        preempt_disable_notrace();
 
         if (atomic_read(&buffer->record_disabled))
                 goto out_nocheck;
@@ -2295,21 +2293,13 @@ ring_buffer_lock_reserve(struct ring_buffer *buffer, unsigned long length)
         if (!event)
                 goto out;
 
-        /*
-         * Need to store resched state on this cpu.
-         * Only the first needs to.
-         */
-
-        if (preempt_count() == 1)
-                per_cpu(rb_need_resched, cpu) = resched;
-
         return event;
 
  out:
         trace_recursive_unlock();
 
  out_nocheck:
-        ftrace_preempt_enable(resched);
+        preempt_enable_notrace();
         return NULL;
 }
 EXPORT_SYMBOL_GPL(ring_buffer_lock_reserve);
@@ -2355,13 +2345,7 @@ int ring_buffer_unlock_commit(struct ring_buffer *buffer,
 
         trace_recursive_unlock();
 
-        /*
-         * Only the last preempt count needs to restore preemption.
-         */
-        if (preempt_count() == 1)
-                ftrace_preempt_enable(per_cpu(rb_need_resched, cpu));
-        else
-                preempt_enable_no_resched_notrace();
+        preempt_enable_notrace();
 
         return 0;
 }
@@ -2469,13 +2453,7 @@ void ring_buffer_discard_commit(struct ring_buffer *buffer,
 
         trace_recursive_unlock();
 
-        /*
-         * Only the last preempt count needs to restore preemption.
-         */
-        if (preempt_count() == 1)
-                ftrace_preempt_enable(per_cpu(rb_need_resched, cpu));
-        else
-                preempt_enable_no_resched_notrace();
+        preempt_enable_notrace();
 
 }
 EXPORT_SYMBOL_GPL(ring_buffer_discard_commit);
@@ -2501,12 +2479,12 @@ int ring_buffer_write(struct ring_buffer *buffer,
         struct ring_buffer_event *event;
         void *body;
         int ret = -EBUSY;
-        int cpu, resched;
+        int cpu;
 
         if (ring_buffer_flags != RB_BUFFERS_ON)
                 return -EBUSY;
 
-        resched = ftrace_preempt_disable();
+        preempt_disable_notrace();
 
         if (atomic_read(&buffer->record_disabled))
                 goto out;
@@ -2536,7 +2514,7 @@ int ring_buffer_write(struct ring_buffer *buffer,
 
         ret = 0;
  out:
-        ftrace_preempt_enable(resched);
+        preempt_enable_notrace();
 
         return ret;
 }
@@ -3868,6 +3846,9 @@ int ring_buffer_read_page(struct ring_buffer *buffer,
                         rpos = reader->read;
                         pos += size;
 
+                        if (rpos >= commit)
+                                break;
+
                         event = rb_reader_event(cpu_buffer);
                         size = rb_event_length(event);
                 } while (len > size);
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 086d36316805..9ec59f541156 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -101,10 +101,7 @@ static inline void ftrace_enable_cpu(void)
         preempt_enable();
 }
 
-static cpumask_var_t __read_mostly      tracing_buffer_mask;
-
-#define for_each_tracing_cpu(cpu)       \
-        for_each_cpu(cpu, tracing_buffer_mask)
+cpumask_var_t __read_mostly     tracing_buffer_mask;
 
 /*
  * ftrace_dump_on_oops - variable to dump ftrace buffer on oops
@@ -344,7 +341,7 @@ static DECLARE_WAIT_QUEUE_HEAD(trace_wait);
 /* trace_flags holds trace_options default values */
 unsigned long trace_flags = TRACE_ITER_PRINT_PARENT | TRACE_ITER_PRINTK |
         TRACE_ITER_ANNOTATE | TRACE_ITER_CONTEXT_INFO | TRACE_ITER_SLEEP_TIME |
-        TRACE_ITER_GRAPH_TIME;
+        TRACE_ITER_GRAPH_TIME | TRACE_ITER_RECORD_CMD;
 
 static int trace_stop_count;
 static DEFINE_SPINLOCK(tracing_start_lock);
@@ -428,6 +425,7 @@ static const char *trace_options[] = {
         "latency-format",
         "sleep-time",
         "graph-time",
+        "record-cmd",
         NULL
 };
 
@@ -659,6 +657,10 @@ update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu)
                 return;
 
         WARN_ON_ONCE(!irqs_disabled());
+        if (!current_trace->use_max_tr) {
+                WARN_ON_ONCE(1);
+                return;
+        }
         arch_spin_lock(&ftrace_max_lock);
 
         tr->buffer = max_tr.buffer;
@@ -685,6 +687,11 @@ update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu)
                 return;
 
         WARN_ON_ONCE(!irqs_disabled());
+        if (!current_trace->use_max_tr) {
+                WARN_ON_ONCE(1);
+                return;
+        }
+
         arch_spin_lock(&ftrace_max_lock);
 
         ftrace_disable_cpu();
@@ -729,18 +736,11 @@ __acquires(kernel_lock)
                 return -1;
         }
 
-        if (strlen(type->name) > MAX_TRACER_SIZE) {
+        if (strlen(type->name) >= MAX_TRACER_SIZE) {
                 pr_info("Tracer has a name longer than %d\n", MAX_TRACER_SIZE);
                 return -1;
         }
 
-        /*
-         * When this gets called we hold the BKL which means that
-         * preemption is disabled. Various trace selftests however
-         * need to disable and enable preemption for successful tests.
-         * So we drop the BKL here and grab it after the tests again.
-         */
-        unlock_kernel();
         mutex_lock(&trace_types_lock);
 
         tracing_selftest_running = true;
@@ -822,7 +822,6 @@ __acquires(kernel_lock)
 #endif
 
  out_unlock:
-        lock_kernel();
         return ret;
 }
 
@@ -1331,61 +1330,6 @@ static void __trace_userstack(struct trace_array *tr, unsigned long flags)
 
 #endif /* CONFIG_STACKTRACE */
 
-static void
-ftrace_trace_special(void *__tr,
-                     unsigned long arg1, unsigned long arg2, unsigned long arg3,
-                     int pc)
-{
-        struct ftrace_event_call *call = &event_special;
-        struct ring_buffer_event *event;
-        struct trace_array *tr = __tr;
-        struct ring_buffer *buffer = tr->buffer;
-        struct special_entry *entry;
-
-        event = trace_buffer_lock_reserve(buffer, TRACE_SPECIAL,
-                                          sizeof(*entry), 0, pc);
-        if (!event)
-                return;
-        entry   = ring_buffer_event_data(event);
-        entry->arg1                     = arg1;
-        entry->arg2                     = arg2;
-        entry->arg3                     = arg3;
-
-        if (!filter_check_discard(call, entry, buffer, event))
-                trace_buffer_unlock_commit(buffer, event, 0, pc);
-}
-
-void
-__trace_special(void *__tr, void *__data,
-                unsigned long arg1, unsigned long arg2, unsigned long arg3)
-{
-        ftrace_trace_special(__tr, arg1, arg2, arg3, preempt_count());
-}
-
-void
-ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3)
-{
-        struct trace_array *tr = &global_trace;
-        struct trace_array_cpu *data;
-        unsigned long flags;
-        int cpu;
-        int pc;
-
-        if (tracing_disabled)
-                return;
-
-        pc = preempt_count();
-        local_irq_save(flags);
-        cpu = raw_smp_processor_id();
-        data = tr->data[cpu];
-
-        if (likely(atomic_inc_return(&data->disabled) == 1))
-                ftrace_trace_special(tr, arg1, arg2, arg3, pc);
-
-        atomic_dec(&data->disabled);
-        local_irq_restore(flags);
-}
-
 /**
  * trace_vbprintk - write binary msg to tracing buffer
  *
@@ -1404,7 +1348,6 @@ int trace_vbprintk(unsigned long ip, const char *fmt, va_list args)
         struct bprint_entry *entry;
         unsigned long flags;
         int disable;
-        int resched;
         int cpu, len = 0, size, pc;
 
         if (unlikely(tracing_selftest_running || tracing_disabled))
@@ -1414,7 +1357,7 @@ int trace_vbprintk(unsigned long ip, const char *fmt, va_list args)
         pause_graph_tracing();
 
         pc = preempt_count();
-        resched = ftrace_preempt_disable();
+        preempt_disable_notrace();
         cpu = raw_smp_processor_id();
         data = tr->data[cpu];
 
@@ -1452,7 +1395,7 @@ out_unlock:
 
 out:
         atomic_dec_return(&data->disabled);
-        ftrace_preempt_enable(resched);
+        preempt_enable_notrace();
         unpause_graph_tracing();
 
         return len;
@@ -1539,11 +1482,6 @@ int trace_vprintk(unsigned long ip, const char *fmt, va_list args)
 }
 EXPORT_SYMBOL_GPL(trace_vprintk);
 
-enum trace_file_type {
-        TRACE_FILE_LAT_FMT      = 1,
-        TRACE_FILE_ANNOTATE     = 2,
-};
-
 static void trace_iterator_increment(struct trace_iterator *iter)
 {
         /* Don't allow ftrace to trace into the ring buffers */
@@ -1641,7 +1579,7 @@ struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
 }
 
 /* Find the next real entry, and increment the iterator to the next entry */
-static void *find_next_entry_inc(struct trace_iterator *iter)
+void *trace_find_next_entry_inc(struct trace_iterator *iter)
 {
         iter->ent = __find_next_entry(iter, &iter->cpu,
                                       &iter->lost_events, &iter->ts);
@@ -1676,19 +1614,19 @@ static void *s_next(struct seq_file *m, void *v, loff_t *pos)
                 return NULL;
 
         if (iter->idx < 0)
-                ent = find_next_entry_inc(iter);
+                ent = trace_find_next_entry_inc(iter);
         else
                 ent = iter;
 
         while (ent && iter->idx < i)
-                ent = find_next_entry_inc(iter);
+                ent = trace_find_next_entry_inc(iter);
 
         iter->pos = *pos;
 
         return ent;
 }
 
-static void tracing_iter_reset(struct trace_iterator *iter, int cpu)
+void tracing_iter_reset(struct trace_iterator *iter, int cpu)
 {
         struct trace_array *tr = iter->tr;
         struct ring_buffer_event *event;
@@ -2049,7 +1987,7 @@ int trace_empty(struct trace_iterator *iter)
 }
 
 /*  Called with trace_event_read_lock() held. */
-static enum print_line_t print_trace_line(struct trace_iterator *iter)
+enum print_line_t print_trace_line(struct trace_iterator *iter)
 {
         enum print_line_t ret;
 
@@ -2394,6 +2332,7 @@ static const struct file_operations show_traces_fops = {
         .open           = show_traces_open,
         .read           = seq_read,
         .release        = seq_release,
+        .llseek         = seq_lseek,
 };
 
 /*
@@ -2487,6 +2426,7 @@ static const struct file_operations tracing_cpumask_fops = {
         .open           = tracing_open_generic,
         .read           = tracing_cpumask_read,
         .write          = tracing_cpumask_write,
+        .llseek         = generic_file_llseek,
 };
 
 static int tracing_trace_options_show(struct seq_file *m, void *v)
@@ -2562,6 +2502,9 @@ static void set_tracer_flags(unsigned int mask, int enabled)
                 trace_flags |= mask;
         else
                 trace_flags &= ~mask;
+
+        if (mask == TRACE_ITER_RECORD_CMD)
+                trace_event_enable_cmd_record(enabled);
 }
 
 static ssize_t
@@ -2653,6 +2596,7 @@ tracing_readme_read(struct file *filp, char __user *ubuf,
 static const struct file_operations tracing_readme_fops = {
         .open           = tracing_open_generic,
         .read           = tracing_readme_read,
+        .llseek         = generic_file_llseek,
 };
 
 static ssize_t
@@ -2703,6 +2647,7 @@ tracing_saved_cmdlines_read(struct file *file, char __user *ubuf,
 static const struct file_operations tracing_saved_cmdlines_fops = {
     .open       = tracing_open_generic,
     .read       = tracing_saved_cmdlines_read,
+    .llseek     = generic_file_llseek,
 };
 
 static ssize_t
@@ -2798,6 +2743,9 @@ static int tracing_resize_ring_buffer(unsigned long size)
         if (ret < 0)
                 return ret;
 
+        if (!current_trace->use_max_tr)
+                goto out;
+
         ret = ring_buffer_resize(max_tr.buffer, size);
         if (ret < 0) {
                 int r;
@@ -2825,11 +2773,14 @@ static int tracing_resize_ring_buffer(unsigned long size)
                 return ret;
         }
 
+        max_tr.entries = size;
+ out:
         global_trace.entries = size;
 
         return ret;
 }
 
+
 /**
  * tracing_update_buffers - used by tracing facility to expand ring buffers
  *
@@ -2890,12 +2841,26 @@ static int tracing_set_tracer(const char *buf)
         trace_branch_disable();
         if (current_trace && current_trace->reset)
                 current_trace->reset(tr);
-
+        if (current_trace && current_trace->use_max_tr) {
+                /*
+                 * We don't free the ring buffer. instead, resize it because
+                 * The max_tr ring buffer has some state (e.g. ring->clock) and
+                 * we want preserve it.
+                 */
+                ring_buffer_resize(max_tr.buffer, 1);
+                max_tr.entries = 1;
+        }
         destroy_trace_option_files(topts);
 
         current_trace = t;
 
         topts = create_trace_option_files(current_trace);
+        if (current_trace->use_max_tr) {
+                ret = ring_buffer_resize(max_tr.buffer, global_trace.entries);
+                if (ret < 0)
+                        goto out;
+                max_tr.entries = global_trace.entries;
+        }
 
         if (t->init) {
                 ret = tracer_init(t, tr);
@@ -3032,6 +2997,7 @@ static int tracing_open_pipe(struct inode *inode, struct file *filp)
         if (iter->trace->pipe_open)
                 iter->trace->pipe_open(iter);
 
+        nonseekable_open(inode, filp);
 out:
         mutex_unlock(&trace_types_lock);
         return ret;
@@ -3211,7 +3177,7 @@ waitagain:
 
         trace_event_read_lock();
         trace_access_lock(iter->cpu_file);
-        while (find_next_entry_inc(iter) != NULL) {
+        while (trace_find_next_entry_inc(iter) != NULL) {
                 enum print_line_t ret;
                 int len = iter->seq.len;
 
@@ -3294,7 +3260,7 @@ tracing_fill_pipe_page(size_t rem, struct trace_iterator *iter)
                 if (ret != TRACE_TYPE_NO_CONSUME)
                         trace_consume(iter);
                 rem -= count;
-                if (!find_next_entry_inc(iter)) {
+                if (!trace_find_next_entry_inc(iter))   {
                         rem = 0;
                         iter->ent = NULL;
                         break;
@@ -3350,7 +3316,7 @@ static ssize_t tracing_splice_read_pipe(struct file *filp,
         if (ret <= 0)
                 goto out_err;
 
-        if (!iter->ent && !find_next_entry_inc(iter)) {
+        if (!iter->ent && !trace_find_next_entry_inc(iter)) {
                 ret = -EFAULT;
                 goto out_err;
         }
@@ -3477,7 +3443,6 @@ tracing_entries_write(struct file *filp, const char __user *ubuf,
         }
 
         tracing_start();
-        max_tr.entries = global_trace.entries;
         mutex_unlock(&trace_types_lock);
 
         return cnt;
@@ -3498,6 +3463,7 @@ tracing_mark_write(struct file *filp, const char __user *ubuf,
                                         size_t cnt, loff_t *fpos)
 {
         char *buf;
+        size_t written;
 
         if (tracing_disabled)
                 return -EINVAL;
@@ -3519,11 +3485,15 @@ tracing_mark_write(struct file *filp, const char __user *ubuf,
         } else
                 buf[cnt] = '\0';
 
-        cnt = mark_printk("%s", buf);
+        written = mark_printk("%s", buf);
         kfree(buf);
-        *fpos += cnt;
+        *fpos += written;
 
-        return cnt;
+        /* don't tell userspace we wrote more - it might confuse them */
+        if (written > cnt)
+                written = cnt;
+
+        return written;
 }
 
 static int tracing_clock_show(struct seq_file *m, void *v)
@@ -3590,18 +3560,21 @@ static const struct file_operations tracing_max_lat_fops = {
         .open           = tracing_open_generic,
         .read           = tracing_max_lat_read,
         .write          = tracing_max_lat_write,
+        .llseek         = generic_file_llseek,
 };
 
 static const struct file_operations tracing_ctrl_fops = {
         .open           = tracing_open_generic,
         .read           = tracing_ctrl_read,
         .write          = tracing_ctrl_write,
+        .llseek         = generic_file_llseek,
 };
 
 static const struct file_operations set_tracer_fops = {
         .open           = tracing_open_generic,
         .read           = tracing_set_trace_read,
         .write          = tracing_set_trace_write,
+        .llseek         = generic_file_llseek,
 };
 
 static const struct file_operations tracing_pipe_fops = {
@@ -3610,17 +3583,20 @@ static const struct file_operations tracing_pipe_fops = {
         .read           = tracing_read_pipe,
         .splice_read    = tracing_splice_read_pipe,
         .release        = tracing_release_pipe,
+        .llseek         = no_llseek,
 };
 
 static const struct file_operations tracing_entries_fops = {
         .open           = tracing_open_generic,
         .read           = tracing_entries_read,
         .write          = tracing_entries_write,
+        .llseek         = generic_file_llseek,
 };
 
 static const struct file_operations tracing_mark_fops = {
         .open           = tracing_open_generic,
         .write          = tracing_mark_write,
+        .llseek         = generic_file_llseek,
 };
 
 static const struct file_operations trace_clock_fops = {
@@ -3926,6 +3902,7 @@ tracing_stats_read(struct file *filp, char __user *ubuf,
 static const struct file_operations tracing_stats_fops = {
         .open           = tracing_open_generic,
         .read           = tracing_stats_read,
+        .llseek         = generic_file_llseek,
 };
 
 #ifdef CONFIG_DYNAMIC_FTRACE
@@ -3962,6 +3939,7 @@ tracing_read_dyn_info(struct file *filp, char __user *ubuf,
 static const struct file_operations tracing_dyn_info_fops = {
         .open           = tracing_open_generic,
         .read           = tracing_read_dyn_info,
+        .llseek         = generic_file_llseek,
 };
 #endif
 
@@ -4115,6 +4093,7 @@ static const struct file_operations trace_options_fops = {
         .open = tracing_open_generic,
         .read = trace_options_read,
         .write = trace_options_write,
+        .llseek = generic_file_llseek,
 };
 
 static ssize_t
@@ -4166,6 +4145,7 @@ static const struct file_operations trace_options_core_fops = {
         .open = tracing_open_generic,
         .read = trace_options_core_read,
         .write = trace_options_core_write,
+        .llseek = generic_file_llseek,
 };
 
 struct dentry *trace_create_file(const char *name,
@@ -4355,9 +4335,6 @@ static __init int tracer_init_debugfs(void)
         trace_create_file("dyn_ftrace_total_info", 0444, d_tracer,
                         &ftrace_update_tot_cnt, &tracing_dyn_info_fops);
 #endif
-#ifdef CONFIG_SYSPROF_TRACER
-        init_tracer_sysprof_debugfs(d_tracer);
-#endif
 
         create_trace_options_dir();
 
@@ -4414,7 +4391,7 @@ static struct notifier_block trace_die_notifier = {
  */
 #define KERN_TRACE              KERN_EMERG
 
-static void
+void
 trace_printk_seq(struct trace_seq *s)
 {
         /* Probably should print a warning here. */
@@ -4429,6 +4406,13 @@ trace_printk_seq(struct trace_seq *s)
         trace_seq_init(s);
 }
 
+void trace_init_global_iter(struct trace_iterator *iter)
+{
+        iter->tr = &global_trace;
+        iter->trace = current_trace;
+        iter->cpu_file = TRACE_PIPE_ALL_CPU;
+}
+
 static void
 __ftrace_dump(bool disable_tracing, enum ftrace_dump_mode oops_dump_mode)
 {
@@ -4454,8 +4438,10 @@ __ftrace_dump(bool disable_tracing, enum ftrace_dump_mode oops_dump_mode)
         if (disable_tracing)
                 ftrace_kill();
 
+        trace_init_global_iter(&iter);
+
         for_each_tracing_cpu(cpu) {
-                atomic_inc(&global_trace.data[cpu]->disabled);
+                atomic_inc(&iter.tr->data[cpu]->disabled);
         }
 
         old_userobj = trace_flags & TRACE_ITER_SYM_USEROBJ;
@@ -4504,7 +4490,7 @@ __ftrace_dump(bool disable_tracing, enum ftrace_dump_mode oops_dump_mode)
                 iter.iter_flags |= TRACE_FILE_LAT_FMT;
                 iter.pos = -1;
 
-                if (find_next_entry_inc(&iter) != NULL) {
+                if (trace_find_next_entry_inc(&iter) != NULL) {
                         int ret;
 
                         ret = print_trace_line(&iter);
@@ -4526,7 +4512,7 @@ __ftrace_dump(bool disable_tracing, enum ftrace_dump_mode oops_dump_mode)
                 trace_flags |= old_userobj;
 
                 for_each_tracing_cpu(cpu) {
-                        atomic_dec(&global_trace.data[cpu]->disabled);
+                        atomic_dec(&iter.tr->data[cpu]->disabled);
                 }
                 tracing_on();
         }
@@ -4575,16 +4561,14 @@ __init static int tracer_alloc_buffers(void)
 
 
 #ifdef CONFIG_TRACER_MAX_TRACE
-        max_tr.buffer = ring_buffer_alloc(ring_buf_size,
-                                             TRACE_BUFFER_FLAGS);
+        max_tr.buffer = ring_buffer_alloc(1, TRACE_BUFFER_FLAGS);
         if (!max_tr.buffer) {
                 printk(KERN_ERR "tracer: failed to allocate max ring buffer!\n");
                 WARN_ON(1);
                 ring_buffer_free(global_trace.buffer);
                 goto out_free_cpumask;
         }
-        max_tr.entries = ring_buffer_size(max_tr.buffer);
-        WARN_ON(max_tr.entries != global_trace.entries);
+        max_tr.entries = 1;
 #endif
 
         /* Allocate the first page for all buffers */
@@ -4597,9 +4581,6 @@ __init static int tracer_alloc_buffers(void)
 
         register_tracer(&nop_trace);
         current_trace = &nop_trace;
-#ifdef CONFIG_BOOT_TRACER
-        register_tracer(&boot_tracer);
-#endif
         /* All seems OK, enable tracing */
         tracing_disabled = 0;
 
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 2cd96399463f..d39b3c5454a5 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -9,10 +9,7 @@
 #include <linux/mmiotrace.h>
 #include <linux/tracepoint.h>
 #include <linux/ftrace.h>
-#include <trace/boot.h>
-#include <linux/kmemtrace.h>
 #include <linux/hw_breakpoint.h>
-
 #include <linux/trace_seq.h>
 #include <linux/ftrace_event.h>
 
@@ -25,30 +22,17 @@ enum trace_type {
         TRACE_STACK,
         TRACE_PRINT,
         TRACE_BPRINT,
-        TRACE_SPECIAL,
         TRACE_MMIO_RW,
         TRACE_MMIO_MAP,
         TRACE_BRANCH,
-        TRACE_BOOT_CALL,
-        TRACE_BOOT_RET,
         TRACE_GRAPH_RET,
         TRACE_GRAPH_ENT,
         TRACE_USER_STACK,
-        TRACE_KMEM_ALLOC,
-        TRACE_KMEM_FREE,
         TRACE_BLK,
-        TRACE_KSYM,
 
         __TRACE_LAST_TYPE,
 };
 
-enum kmemtrace_type_id {
-        KMEMTRACE_TYPE_KMALLOC = 0,     /* kmalloc() or kfree(). */
-        KMEMTRACE_TYPE_CACHE,           /* kmem_cache_*(). */
-        KMEMTRACE_TYPE_PAGES,           /* __get_free_pages() and friends. */
-};
-
-extern struct tracer boot_tracer;
 
 #undef __field
 #define __field(type, item)             type    item;
@@ -204,23 +188,15 @@ extern void __ftrace_bad_type(void);
                 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
                 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT);   \
                 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
-                IF_ASSIGN(var, ent, struct special_entry, 0);           \
                 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw,          \
                           TRACE_MMIO_RW);                               \
                 IF_ASSIGN(var, ent, struct trace_mmiotrace_map,         \
                           TRACE_MMIO_MAP);                              \
-                IF_ASSIGN(var, ent, struct trace_boot_call, TRACE_BOOT_CALL);\
-                IF_ASSIGN(var, ent, struct trace_boot_ret, TRACE_BOOT_RET);\
                 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
                 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry,      \
                           TRACE_GRAPH_ENT);             \
                 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry,      \
                           TRACE_GRAPH_RET);             \
-                IF_ASSIGN(var, ent, struct kmemtrace_alloc_entry,       \
-                          TRACE_KMEM_ALLOC);    \
-                IF_ASSIGN(var, ent, struct kmemtrace_free_entry,        \
-                          TRACE_KMEM_FREE);     \
-                IF_ASSIGN(var, ent, struct ksym_trace_entry, TRACE_KSYM);\
                 __ftrace_bad_type();                                    \
         } while (0)
 
@@ -298,6 +274,7 @@ struct tracer {
         struct tracer           *next;
         int                     print_max;
         struct tracer_flags     *flags;
+        int                     use_max_tr;
 };
 
 
@@ -318,7 +295,6 @@ struct dentry *trace_create_file(const char *name,
                                  const struct file_operations *fops);
 
 struct dentry *tracing_init_dentry(void);
-void init_tracer_sysprof_debugfs(struct dentry *d_tracer);
 
 struct ring_buffer_event;
 
@@ -338,6 +314,14 @@ struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
                                           int *ent_cpu, u64 *ent_ts);
 
+int trace_empty(struct trace_iterator *iter);
+
+void *trace_find_next_entry_inc(struct trace_iterator *iter);
+
+void trace_init_global_iter(struct trace_iterator *iter);
+
+void tracing_iter_reset(struct trace_iterator *iter, int cpu);
+
 void default_wait_pipe(struct trace_iterator *iter);
 void poll_wait_pipe(struct trace_iterator *iter);
 
@@ -355,11 +339,6 @@ void tracing_sched_wakeup_trace(struct trace_array *tr,
                                 struct task_struct *wakee,
                                 struct task_struct *cur,
                                 unsigned long flags, int pc);
-void trace_special(struct trace_array *tr,
-                   struct trace_array_cpu *data,
-                   unsigned long arg1,
-                   unsigned long arg2,
-                   unsigned long arg3, int pc);
 void trace_function(struct trace_array *tr,
                     unsigned long ip,
                     unsigned long parent_ip,
@@ -380,8 +359,15 @@ void tracing_start_sched_switch_record(void);
 int register_tracer(struct tracer *type);
 void unregister_tracer(struct tracer *type);
 int is_tracing_stopped(void);
+enum trace_file_type {
+        TRACE_FILE_LAT_FMT      = 1,
+        TRACE_FILE_ANNOTATE     = 2,
+};
+
+extern cpumask_var_t __read_mostly tracing_buffer_mask;
 
-extern int process_new_ksym_entry(char *ksymname, int op, unsigned long addr);
+#define for_each_tracing_cpu(cpu)       \
+        for_each_cpu(cpu, tracing_buffer_mask)
 
 extern unsigned long nsecs_to_usecs(unsigned long nsecs);
 
@@ -452,12 +438,8 @@ extern int trace_selftest_startup_nop(struct tracer *trace,
                                          struct trace_array *tr);
 extern int trace_selftest_startup_sched_switch(struct tracer *trace,
                                                struct trace_array *tr);
-extern int trace_selftest_startup_sysprof(struct tracer *trace,
-                                               struct trace_array *tr);
 extern int trace_selftest_startup_branch(struct tracer *trace,
                                          struct trace_array *tr);
-extern int trace_selftest_startup_ksym(struct tracer *trace,
-                                         struct trace_array *tr);
 #endif /* CONFIG_FTRACE_STARTUP_TEST */
 
 extern void *head_page(struct trace_array_cpu *data);
@@ -471,6 +453,8 @@ trace_array_vprintk(struct trace_array *tr,
                     unsigned long ip, const char *fmt, va_list args);
 int trace_array_printk(struct trace_array *tr,
                        unsigned long ip, const char *fmt, ...);
+void trace_printk_seq(struct trace_seq *s);
+enum print_line_t print_trace_line(struct trace_iterator *iter);
 
 extern unsigned long trace_flags;
 
@@ -617,6 +601,7 @@ enum trace_iterator_flags {
         TRACE_ITER_LATENCY_FMT          = 0x20000,
         TRACE_ITER_SLEEP_TIME           = 0x40000,
         TRACE_ITER_GRAPH_TIME           = 0x80000,
+        TRACE_ITER_RECORD_CMD           = 0x100000,
 };
 
 /*
@@ -628,54 +613,6 @@ enum trace_iterator_flags {
 
 extern struct tracer nop_trace;
 
-/**
- * ftrace_preempt_disable - disable preemption scheduler safe
- *
- * When tracing can happen inside the scheduler, there exists
- * cases that the tracing might happen before the need_resched
- * flag is checked. If this happens and the tracer calls
- * preempt_enable (after a disable), a schedule might take place
- * causing an infinite recursion.
- *
- * To prevent this, we read the need_resched flag before
- * disabling preemption. When we want to enable preemption we
- * check the flag, if it is set, then we call preempt_enable_no_resched.
- * Otherwise, we call preempt_enable.
- *
- * The rational for doing the above is that if need_resched is set
- * and we have yet to reschedule, we are either in an atomic location
- * (where we do not need to check for scheduling) or we are inside
- * the scheduler and do not want to resched.
- */
-static inline int ftrace_preempt_disable(void)
-{
-        int resched;
-
-        resched = need_resched();
-        preempt_disable_notrace();
-
-        return resched;
-}
-
-/**
- * ftrace_preempt_enable - enable preemption scheduler safe
- * @resched: the return value from ftrace_preempt_disable
- *
- * This is a scheduler safe way to enable preemption and not miss
- * any preemption checks. The disabled saved the state of preemption.
- * If resched is set, then we are either inside an atomic or
- * are inside the scheduler (we would have already scheduled
- * otherwise). In this case, we do not want to call normal
- * preempt_enable, but preempt_enable_no_resched instead.
- */
-static inline void ftrace_preempt_enable(int resched)
-{
-        if (resched)
-                preempt_enable_no_resched_notrace();
-        else
-                preempt_enable_notrace();
-}
-
 #ifdef CONFIG_BRANCH_TRACER
 extern int enable_branch_tracing(struct trace_array *tr);
 extern void disable_branch_tracing(void);
@@ -766,6 +703,8 @@ struct filter_pred {
         int                     pop_n;
 };
 
+extern struct list_head ftrace_common_fields;
+
 extern enum regex_type
 filter_parse_regex(char *buff, int len, char **search, int *not);
 extern void print_event_filter(struct ftrace_event_call *call,
@@ -795,6 +734,8 @@ filter_check_discard(struct ftrace_event_call *call, void *rec,
         return 0;
 }
 
+extern void trace_event_enable_cmd_record(bool enable);
+
 extern struct mutex event_mutex;
 extern struct list_head ftrace_events;
 
diff --git a/kernel/trace/trace_boot.c b/kernel/trace/trace_boot.c
deleted file mode 100644
index c21d5f3956ad..000000000000
--- a/kernel/trace/trace_boot.c
+++ /dev/null
@@ -1,185 +0,0 @@
-/*
- * ring buffer based initcalls tracer
- *
- * Copyright (C) 2008 Frederic Weisbecker <fweisbec@gmail.com>
- *
- */
-
-#include <linux/init.h>
-#include <linux/debugfs.h>
-#include <linux/ftrace.h>
-#include <linux/kallsyms.h>
-#include <linux/time.h>
-
-#include "trace.h"
-#include "trace_output.h"
-
-static struct trace_array *boot_trace;
-static bool pre_initcalls_finished;
-
-/* Tells the boot tracer that the pre_smp_initcalls are finished.
- * So we are ready .
- * It doesn't enable sched events tracing however.
- * You have to call enable_boot_trace to do so.
- */
-void start_boot_trace(void)
-{
-        pre_initcalls_finished = true;
-}
-
-void enable_boot_trace(void)
-{
-        if (boot_trace && pre_initcalls_finished)
-                tracing_start_sched_switch_record();
-}
-
-void disable_boot_trace(void)
-{
-        if (boot_trace && pre_initcalls_finished)
-                tracing_stop_sched_switch_record();
-}
-
-static int boot_trace_init(struct trace_array *tr)
-{
-        boot_trace = tr;
-
-        if (!tr)
-                return 0;
-
-        tracing_reset_online_cpus(tr);
-
-        tracing_sched_switch_assign_trace(tr);
-        return 0;
-}
-
-static enum print_line_t
-initcall_call_print_line(struct trace_iterator *iter)
-{
-        struct trace_entry *entry = iter->ent;
-        struct trace_seq *s = &iter->seq;
-        struct trace_boot_call *field;
-        struct boot_trace_call *call;
-        u64 ts;
-        unsigned long nsec_rem;
-        int ret;
-
-        trace_assign_type(field, entry);
-        call = &field->boot_call;
-        ts = iter->ts;
-        nsec_rem = do_div(ts, NSEC_PER_SEC);
-
-        ret = trace_seq_printf(s, "[%5ld.%09ld] calling  %s @ %i\n",
-                        (unsigned long)ts, nsec_rem, call->func, call->caller);
-
-        if (!ret)
-                return TRACE_TYPE_PARTIAL_LINE;
-        else
-                return TRACE_TYPE_HANDLED;
-}
-
-static enum print_line_t
-initcall_ret_print_line(struct trace_iterator *iter)
-{
-        struct trace_entry *entry = iter->ent;
-        struct trace_seq *s = &iter->seq;
-        struct trace_boot_ret *field;
-        struct boot_trace_ret *init_ret;
-        u64 ts;
-        unsigned long nsec_rem;
-        int ret;
-
-        trace_assign_type(field, entry);
-        init_ret = &field->boot_ret;
-        ts = iter->ts;
-        nsec_rem = do_div(ts, NSEC_PER_SEC);
-
-        ret = trace_seq_printf(s, "[%5ld.%09ld] initcall %s "
-                        "returned %d after %llu msecs\n",
-                        (unsigned long) ts,
-                        nsec_rem,
-                        init_ret->func, init_ret->result, init_ret->duration);
-
-        if (!ret)
-                return TRACE_TYPE_PARTIAL_LINE;
-        else
-                return TRACE_TYPE_HANDLED;
-}
-
-static enum print_line_t initcall_print_line(struct trace_iterator *iter)
-{
-        struct trace_entry *entry = iter->ent;
-
-        switch (entry->type) {
-        case TRACE_BOOT_CALL:
-                return initcall_call_print_line(iter);
-        case TRACE_BOOT_RET:
-                return initcall_ret_print_line(iter);
-        default:
-                return TRACE_TYPE_UNHANDLED;
-        }
-}
-
-struct tracer boot_tracer __read_mostly =
-{
-        .name           = "initcall",
-        .init           = boot_trace_init,
-        .reset          = tracing_reset_online_cpus,
-        .print_line     = initcall_print_line,
-};
-
-void trace_boot_call(struct boot_trace_call *bt, initcall_t fn)
-{
-        struct ftrace_event_call *call = &event_boot_call;
-        struct ring_buffer_event *event;
-        struct ring_buffer *buffer;
-        struct trace_boot_call *entry;
-        struct trace_array *tr = boot_trace;
-
-        if (!tr || !pre_initcalls_finished)
-                return;
-
-        /* Get its name now since this function could
-         * disappear because it is in the .init section.
-         */
-        sprint_symbol(bt->func, (unsigned long)fn);
-        preempt_disable();
-
-        buffer = tr->buffer;
-        event = trace_buffer_lock_reserve(buffer, TRACE_BOOT_CALL,
-                                          sizeof(*entry), 0, 0);
-        if (!event)
-                goto out;
-        entry   = ring_buffer_event_data(event);
-        entry->boot_call = *bt;
-        if (!filter_check_discard(call, entry, buffer, event))
-                trace_buffer_unlock_commit(buffer, event, 0, 0);
- out:
-        preempt_enable();
-}
-
-void trace_boot_ret(struct boot_trace_ret *bt, initcall_t fn)
-{
-        struct ftrace_event_call *call = &event_boot_ret;
-        struct ring_buffer_event *event;
-        struct ring_buffer *buffer;
-        struct trace_boot_ret *entry;
-        struct trace_array *tr = boot_trace;
-
-        if (!tr || !pre_initcalls_finished)
-                return;
-
-        sprint_symbol(bt->func, (unsigned long)fn);
-        preempt_disable();
-
-        buffer = tr->buffer;
-        event = trace_buffer_lock_reserve(buffer, TRACE_BOOT_RET,
-                                          sizeof(*entry), 0, 0);
-        if (!event)
-                goto out;
-        entry   = ring_buffer_event_data(event);
-        entry->boot_ret = *bt;
-        if (!filter_check_discard(call, entry, buffer, event))
-                trace_buffer_unlock_commit(buffer, event, 0, 0);
- out:
-        preempt_enable();
-}
diff --git a/kernel/trace/trace_clock.c b/kernel/trace/trace_clock.c
index 9d589d8dcd1a..685a67d55db0 100644
--- a/kernel/trace/trace_clock.c
+++ b/kernel/trace/trace_clock.c
@@ -32,16 +32,15 @@
 u64 notrace trace_clock_local(void)
 {
         u64 clock;
-        int resched;
 
         /*
          * sched_clock() is an architecture implemented, fast, scalable,
          * lockless clock. It is not guaranteed to be coherent across
          * CPUs, nor across CPU idle events.
          */
-        resched = ftrace_preempt_disable();
+        preempt_disable_notrace();
         clock = sched_clock();
-        ftrace_preempt_enable(resched);
+        preempt_enable_notrace();
 
         return clock;
 }
@@ -56,7 +55,7 @@ u64 notrace trace_clock_local(void)
  */
 u64 notrace trace_clock(void)
 {
-        return cpu_clock(raw_smp_processor_id());
+        return local_clock();
 }
 
 
diff --git a/kernel/trace/trace_entries.h b/kernel/trace/trace_entries.h
index dc008c1240da..e3dfecaf13e6 100644
--- a/kernel/trace/trace_entries.h
+++ b/kernel/trace/trace_entries.h
@@ -151,23 +151,6 @@ FTRACE_ENTRY_DUP(wakeup, ctx_switch_entry,
 );
 
 /*
- * Special (free-form) trace entry:
- */
-FTRACE_ENTRY(special, special_entry,
-
-        TRACE_SPECIAL,
-
-        F_STRUCT(
-                __field(        unsigned long,  arg1    )
-                __field(        unsigned long,  arg2    )
-                __field(        unsigned long,  arg3    )
-        ),
-
-        F_printk("(%08lx) (%08lx) (%08lx)",
-                 __entry->arg1, __entry->arg2, __entry->arg3)
-);
-
-/*
  * Stack-trace entry:
  */
 
@@ -271,33 +254,6 @@ FTRACE_ENTRY(mmiotrace_map, trace_mmiotrace_map,
                  __entry->map_id, __entry->opcode)
 );
 
-FTRACE_ENTRY(boot_call, trace_boot_call,
-
-        TRACE_BOOT_CALL,
-
-        F_STRUCT(
-                __field_struct( struct boot_trace_call, boot_call       )
-                __field_desc(   pid_t,  boot_call,      caller          )
-                __array_desc(   char,   boot_call,      func,   KSYM_SYMBOL_LEN)
-        ),
-
-        F_printk("%d  %s", __entry->caller, __entry->func)
-);
-
-FTRACE_ENTRY(boot_ret, trace_boot_ret,
-
-        TRACE_BOOT_RET,
-
-        F_STRUCT(
-                __field_struct( struct boot_trace_ret,  boot_ret        )
-                __array_desc(   char,   boot_ret,       func,   KSYM_SYMBOL_LEN)
-                __field_desc(   int,    boot_ret,       result          )
-                __field_desc(   unsigned long, boot_ret, duration       )
-        ),
-
-        F_printk("%s %d %lx",
-                 __entry->func, __entry->result, __entry->duration)
-);
 
 #define TRACE_FUNC_SIZE 30
 #define TRACE_FILE_SIZE 20
@@ -318,53 +274,3 @@ FTRACE_ENTRY(branch, trace_branch,
                  __entry->func, __entry->file, __entry->correct)
 );
 
-FTRACE_ENTRY(kmem_alloc, kmemtrace_alloc_entry,
-
-        TRACE_KMEM_ALLOC,
-
-        F_STRUCT(
-                __field(        enum kmemtrace_type_id, type_id         )
-                __field(        unsigned long,          call_site       )
-                __field(        const void *,           ptr             )
-                __field(        size_t,                 bytes_req       )
-                __field(        size_t,                 bytes_alloc     )
-                __field(        gfp_t,                  gfp_flags       )
-                __field(        int,                    node            )
-        ),
-
-        F_printk("type:%u call_site:%lx ptr:%p req:%zi alloc:%zi"
-                 " flags:%x node:%d",
-                 __entry->type_id, __entry->call_site, __entry->ptr,
-                 __entry->bytes_req, __entry->bytes_alloc,
-                 __entry->gfp_flags, __entry->node)
-);
-
-FTRACE_ENTRY(kmem_free, kmemtrace_free_entry,
-
-        TRACE_KMEM_FREE,
-
-        F_STRUCT(
-                __field(        enum kmemtrace_type_id, type_id         )
-                __field(        unsigned long,          call_site       )
-                __field(        const void *,           ptr             )
-        ),
-
-        F_printk("type:%u call_site:%lx ptr:%p",
-                 __entry->type_id, __entry->call_site, __entry->ptr)
-);
-
-FTRACE_ENTRY(ksym_trace, ksym_trace_entry,
-
-        TRACE_KSYM,
-
-        F_STRUCT(
-                __field(        unsigned long,  ip                        )
-                __field(        unsigned char,  type                      )
-                __array(        char         ,  cmd,       TASK_COMM_LEN  )
-                __field(        unsigned long,  addr                      )
-        ),
-
-        F_printk("ip: %pF type: %d ksym_name: %pS cmd: %s",
-                (void *)__entry->ip, (unsigned int)__entry->type,
-                (void *)__entry->addr,  __entry->cmd)
-);
diff --git a/kernel/trace/trace_event_perf.c b/kernel/trace/trace_event_perf.c
index 8a2b73f7c068..000e6e85b445 100644
--- a/kernel/trace/trace_event_perf.c
+++ b/kernel/trace/trace_event_perf.c
@@ -9,8 +9,6 @@
 #include <linux/kprobes.h>
 #include "trace.h"
 
-EXPORT_SYMBOL_GPL(perf_arch_fetch_caller_regs);
-
 static char *perf_trace_buf[4];
 
 /*
@@ -56,13 +54,7 @@ static int perf_trace_event_init(struct ftrace_event_call *tp_event,
                 }
         }
 
-        if (tp_event->class->reg)
-                ret = tp_event->class->reg(tp_event, TRACE_REG_PERF_REGISTER);
-        else
-                ret = tracepoint_probe_register(tp_event->name,
-                                                tp_event->class->perf_probe,
-                                                tp_event);
-
+        ret = tp_event->class->reg(tp_event, TRACE_REG_PERF_REGISTER);
         if (ret)
                 goto fail;
 
@@ -96,9 +88,7 @@ int perf_trace_init(struct perf_event *p_event)
         mutex_lock(&event_mutex);
         list_for_each_entry(tp_event, &ftrace_events, list) {
                 if (tp_event->event.type == event_id &&
-                    tp_event->class &&
-                    (tp_event->class->perf_probe ||
-                     tp_event->class->reg) &&
+                    tp_event->class && tp_event->class->reg &&
                     try_module_get(tp_event->mod)) {
                         ret = perf_trace_event_init(tp_event, p_event);
                         break;
@@ -138,18 +128,13 @@ void perf_trace_destroy(struct perf_event *p_event)
         if (--tp_event->perf_refcount > 0)
                 goto out;
 
-        if (tp_event->class->reg)
-                tp_event->class->reg(tp_event, TRACE_REG_PERF_UNREGISTER);
-        else
-                tracepoint_probe_unregister(tp_event->name,
-                                            tp_event->class->perf_probe,
-                                            tp_event);
+        tp_event->class->reg(tp_event, TRACE_REG_PERF_UNREGISTER);
 
         /*
-         * Ensure our callback won't be called anymore. See
-         * tracepoint_probe_unregister() and __DO_TRACE().
+         * Ensure our callback won't be called anymore. The buffers
+         * will be freed after that.
          */
-        synchronize_sched();
+        tracepoint_synchronize_unregister();
 
         free_percpu(tp_event->perf_events);
         tp_event->perf_events = NULL;
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 53cffc0b0801..4c758f146328 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -28,6 +28,7 @@
 DEFINE_MUTEX(event_mutex);
 
 LIST_HEAD(ftrace_events);
+LIST_HEAD(ftrace_common_fields);
 
 struct list_head *
 trace_get_fields(struct ftrace_event_call *event_call)
@@ -37,15 +38,11 @@ trace_get_fields(struct ftrace_event_call *event_call)
         return event_call->class->get_fields(event_call);
 }
 
-int trace_define_field(struct ftrace_event_call *call, const char *type,
-                       const char *name, int offset, int size, int is_signed,
-                       int filter_type)
+static int __trace_define_field(struct list_head *head, const char *type,
+                                const char *name, int offset, int size,
+                                int is_signed, int filter_type)
 {
         struct ftrace_event_field *field;
-        struct list_head *head;
-
-        if (WARN_ON(!call->class))
-                return 0;
 
         field = kzalloc(sizeof(*field), GFP_KERNEL);
         if (!field)
@@ -68,7 +65,6 @@ int trace_define_field(struct ftrace_event_call *call, const char *type,
         field->size = size;
         field->is_signed = is_signed;
 
-        head = trace_get_fields(call);
         list_add(&field->link, head);
 
         return 0;
@@ -80,17 +76,32 @@ err:
 
         return -ENOMEM;
 }
+
+int trace_define_field(struct ftrace_event_call *call, const char *type,
+                       const char *name, int offset, int size, int is_signed,
+                       int filter_type)
+{
+        struct list_head *head;
+
+        if (WARN_ON(!call->class))
+                return 0;
+
+        head = trace_get_fields(call);
+        return __trace_define_field(head, type, name, offset, size,
+                                    is_signed, filter_type);
+}
 EXPORT_SYMBOL_GPL(trace_define_field);
 
 #define __common_field(type, item)                                      \
-        ret = trace_define_field(call, #type, "common_" #item,          \
-                                 offsetof(typeof(ent), item),           \
-                                 sizeof(ent.item),                      \
-                                 is_signed_type(type), FILTER_OTHER);   \
+        ret = __trace_define_field(&ftrace_common_fields, #type,        \
+                                   "common_" #item,                     \
+                                   offsetof(typeof(ent), item),         \
+                                   sizeof(ent.item),                    \
+                                   is_signed_type(type), FILTER_OTHER); \
         if (ret)                                                        \
                 return ret;
 
-static int trace_define_common_fields(struct ftrace_event_call *call)
+static int trace_define_common_fields(void)
 {
         int ret;
         struct trace_entry ent;
@@ -130,6 +141,55 @@ int trace_event_raw_init(struct ftrace_event_call *call)
 }
 EXPORT_SYMBOL_GPL(trace_event_raw_init);
 
+int ftrace_event_reg(struct ftrace_event_call *call, enum trace_reg type)
+{
+        switch (type) {
+        case TRACE_REG_REGISTER:
+                return tracepoint_probe_register(call->name,
+                                                 call->class->probe,
+                                                 call);
+        case TRACE_REG_UNREGISTER:
+                tracepoint_probe_unregister(call->name,
+                                            call->class->probe,
+                                            call);
+                return 0;
+
+#ifdef CONFIG_PERF_EVENTS
+        case TRACE_REG_PERF_REGISTER:
+                return tracepoint_probe_register(call->name,
+                                                 call->class->perf_probe,
+                                                 call);
+        case TRACE_REG_PERF_UNREGISTER:
+                tracepoint_probe_unregister(call->name,
+                                            call->class->perf_probe,
+                                            call);
+                return 0;
+#endif
+        }
+        return 0;
+}
+EXPORT_SYMBOL_GPL(ftrace_event_reg);
+
+void trace_event_enable_cmd_record(bool enable)
+{
+        struct ftrace_event_call *call;
+
+        mutex_lock(&event_mutex);
+        list_for_each_entry(call, &ftrace_events, list) {
+                if (!(call->flags & TRACE_EVENT_FL_ENABLED))
+                        continue;
+
+                if (enable) {
+                        tracing_start_cmdline_record();
+                        call->flags |= TRACE_EVENT_FL_RECORDED_CMD;
+                } else {
+                        tracing_stop_cmdline_record();
+                        call->flags &= ~TRACE_EVENT_FL_RECORDED_CMD;
+                }
+        }
+        mutex_unlock(&event_mutex);
+}
+
 static int ftrace_event_enable_disable(struct ftrace_event_call *call,
                                         int enable)
 {
@@ -139,24 +199,20 @@ static int ftrace_event_enable_disable(struct ftrace_event_call *call,
         case 0:
                 if (call->flags & TRACE_EVENT_FL_ENABLED) {
                         call->flags &= ~TRACE_EVENT_FL_ENABLED;
-                        tracing_stop_cmdline_record();
-                        if (call->class->reg)
-                                call->class->reg(call, TRACE_REG_UNREGISTER);
-                        else
-                                tracepoint_probe_unregister(call->name,
-                                                            call->class->probe,
-                                                            call);
+                        if (call->flags & TRACE_EVENT_FL_RECORDED_CMD) {
+                                tracing_stop_cmdline_record();
+                                call->flags &= ~TRACE_EVENT_FL_RECORDED_CMD;
+                        }
+                        call->class->reg(call, TRACE_REG_UNREGISTER);
                 }
                 break;
         case 1:
                 if (!(call->flags & TRACE_EVENT_FL_ENABLED)) {
-                        tracing_start_cmdline_record();
-                        if (call->class->reg)
-                                ret = call->class->reg(call, TRACE_REG_REGISTER);
-                        else
-                                ret = tracepoint_probe_register(call->name,
-                                                                call->class->probe,
-                                                                call);
+                        if (trace_flags & TRACE_ITER_RECORD_CMD) {
+                                tracing_start_cmdline_record();
+                                call->flags |= TRACE_EVENT_FL_RECORDED_CMD;
+                        }
+                        ret = call->class->reg(call, TRACE_REG_REGISTER);
                         if (ret) {
                                 tracing_stop_cmdline_record();
                                 pr_info("event trace: Could not enable event "
@@ -194,8 +250,7 @@ static int __ftrace_set_clr_event(const char *match, const char *sub,
         mutex_lock(&event_mutex);
         list_for_each_entry(call, &ftrace_events, list) {
 
-                if (!call->name || !call->class ||
-                    (!call->class->probe && !call->class->reg))
+                if (!call->name || !call->class || !call->class->reg)
                         continue;
 
                 if (match &&
@@ -321,7 +376,7 @@ t_next(struct seq_file *m, void *v, loff_t *pos)
                  * The ftrace subsystem is for showing formats only.
                  * They can not be enabled or disabled via the event files.
                  */
-                if (call->class && (call->class->probe || call->class->reg))
+                if (call->class && call->class->reg)
                         return call;
         }
 
@@ -474,8 +529,7 @@ system_enable_read(struct file *filp, char __user *ubuf, size_t cnt,
 
         mutex_lock(&event_mutex);
         list_for_each_entry(call, &ftrace_events, list) {
-                if (!call->name || !call->class ||
-                    (!call->class->probe && !call->class->reg))
+                if (!call->name || !call->class || !call->class->reg)
                         continue;
 
                 if (system && strcmp(call->class->system, system) != 0)
@@ -544,85 +598,165 @@ out:
         return ret;
 }
 
-static ssize_t
-event_format_read(struct file *filp, char __user *ubuf, size_t cnt,
-                  loff_t *ppos)
+enum {
+        FORMAT_HEADER           = 1,
+        FORMAT_PRINTFMT         = 2,
+};
+
+static void *f_next(struct seq_file *m, void *v, loff_t *pos)
 {
-        struct ftrace_event_call *call = filp->private_data;
+        struct ftrace_event_call *call = m->private;
         struct ftrace_event_field *field;
         struct list_head *head;
-        struct trace_seq *s;
-        int common_field_count = 5;
-        char *buf;
-        int r = 0;
 
-        if (*ppos)
-                return 0;
+        (*pos)++;
 
-        s = kmalloc(sizeof(*s), GFP_KERNEL);
-        if (!s)
-                return -ENOMEM;
+        switch ((unsigned long)v) {
+        case FORMAT_HEADER:
+                head = &ftrace_common_fields;
 
-        trace_seq_init(s);
+                if (unlikely(list_empty(head)))
+                        return NULL;
 
-        trace_seq_printf(s, "name: %s\n", call->name);
-        trace_seq_printf(s, "ID: %d\n", call->event.type);
-        trace_seq_printf(s, "format:\n");
+                field = list_entry(head->prev, struct ftrace_event_field, link);
+                return field;
+
+        case FORMAT_PRINTFMT:
+                /* all done */
+                return NULL;
+        }
 
         head = trace_get_fields(call);
-        list_for_each_entry_reverse(field, head, link) {
-                /*
-                 * Smartly shows the array type(except dynamic array).
-                 * Normal:
-                 *      field:TYPE VAR
-                 * If TYPE := TYPE[LEN], it is shown:
-                 *      field:TYPE VAR[LEN]
-                 */
-                const char *array_descriptor = strchr(field->type, '[');
 
-                if (!strncmp(field->type, "__data_loc", 10))
-                        array_descriptor = NULL;
+        /*
+         * To separate common fields from event fields, the
+         * LSB is set on the first event field. Clear it in case.
+         */
+        v = (void *)((unsigned long)v & ~1L);
 
-                if (!array_descriptor) {
-                        r = trace_seq_printf(s, "\tfield:%s %s;\toffset:%u;"
-                                        "\tsize:%u;\tsigned:%d;\n",
-                                        field->type, field->name, field->offset,
-                                        field->size, !!field->is_signed);
-                } else {
-                        r = trace_seq_printf(s, "\tfield:%.*s %s%s;\toffset:%u;"
-                                        "\tsize:%u;\tsigned:%d;\n",
-                                        (int)(array_descriptor - field->type),
-                                        field->type, field->name,
-                                        array_descriptor, field->offset,
-                                        field->size, !!field->is_signed);
-                }
+        field = v;
+        /*
+         * If this is a common field, and at the end of the list, then
+         * continue with main list.
+         */
+        if (field->link.prev == &ftrace_common_fields) {
+                if (unlikely(list_empty(head)))
+                        return NULL;
+                field = list_entry(head->prev, struct ftrace_event_field, link);
+                /* Set the LSB to notify f_show to print an extra newline */
+                field = (struct ftrace_event_field *)
+                        ((unsigned long)field | 1);
+                return field;
+        }
 
-                if (--common_field_count == 0)
-                        r = trace_seq_printf(s, "\n");
+        /* If we are done tell f_show to print the format */
+        if (field->link.prev == head)
+                return (void *)FORMAT_PRINTFMT;
 
-                if (!r)
-                        break;
-        }
+        field = list_entry(field->link.prev, struct ftrace_event_field, link);
 
-        if (r)
-                r = trace_seq_printf(s, "\nprint fmt: %s\n",
-                                call->print_fmt);
+        return field;
+}
 
-        if (!r) {
-                /*
-                 * ug!  The format output is bigger than a PAGE!!
-                 */
-                buf = "FORMAT TOO BIG\n";
-                r = simple_read_from_buffer(ubuf, cnt, ppos,
-                                              buf, strlen(buf));
-                goto out;
+static void *f_start(struct seq_file *m, loff_t *pos)
+{
+        loff_t l = 0;
+        void *p;
+
+        /* Start by showing the header */
+        if (!*pos)
+                return (void *)FORMAT_HEADER;
+
+        p = (void *)FORMAT_HEADER;
+        do {
+                p = f_next(m, p, &l);
+        } while (p && l < *pos);
+
+        return p;
+}
+
+static int f_show(struct seq_file *m, void *v)
+{
+        struct ftrace_event_call *call = m->private;
+        struct ftrace_event_field *field;
+        const char *array_descriptor;
+
+        switch ((unsigned long)v) {
+        case FORMAT_HEADER:
+                seq_printf(m, "name: %s\n", call->name);
+                seq_printf(m, "ID: %d\n", call->event.type);
+                seq_printf(m, "format:\n");
+                return 0;
+
+        case FORMAT_PRINTFMT:
+                seq_printf(m, "\nprint fmt: %s\n",
+                           call->print_fmt);
+                return 0;
         }
 
-        r = simple_read_from_buffer(ubuf, cnt, ppos,
-                                    s->buffer, s->len);
- out:
-        kfree(s);
-        return r;
+        /*
+         * To separate common fields from event fields, the
+         * LSB is set on the first event field. Clear it and
+         * print a newline if it is set.
+         */
+        if ((unsigned long)v & 1) {
+                seq_putc(m, '\n');
+                v = (void *)((unsigned long)v & ~1L);
+        }
+
+        field = v;
+
+        /*
+         * Smartly shows the array type(except dynamic array).
+         * Normal:
+         *      field:TYPE VAR
+         * If TYPE := TYPE[LEN], it is shown:
+         *      field:TYPE VAR[LEN]
+         */
+        array_descriptor = strchr(field->type, '[');
+
+        if (!strncmp(field->type, "__data_loc", 10))
+                array_descriptor = NULL;
+
+        if (!array_descriptor)
+                seq_printf(m, "\tfield:%s %s;\toffset:%u;\tsize:%u;\tsigned:%d;\n",
+                           field->type, field->name, field->offset,
+                           field->size, !!field->is_signed);
+        else
+                seq_printf(m, "\tfield:%.*s %s%s;\toffset:%u;\tsize:%u;\tsigned:%d;\n",
+                           (int)(array_descriptor - field->type),
+                           field->type, field->name,
+                           array_descriptor, field->offset,
+                           field->size, !!field->is_signed);
+
+        return 0;
+}
+
+static void f_stop(struct seq_file *m, void *p)
+{
+}
+
+static const struct seq_operations trace_format_seq_ops = {
+        .start          = f_start,
+        .next           = f_next,
+        .stop           = f_stop,
+        .show           = f_show,
+};
+
+static int trace_format_open(struct inode *inode, struct file *file)
+{
+        struct ftrace_event_call *call = inode->i_private;
+        struct seq_file *m;
+        int ret;
+
+        ret = seq_open(file, &trace_format_seq_ops);
+        if (ret < 0)
+                return ret;
+
+        m = file->private_data;
+        m->private = call;
+
+        return 0;
 }
 
 static ssize_t
@@ -820,8 +954,10 @@ static const struct file_operations ftrace_enable_fops = {
 };
 
 static const struct file_operations ftrace_event_format_fops = {
-        .open = tracing_open_generic,
-        .read = event_format_read,
+        .open = trace_format_open,
+        .read = seq_read,
+        .llseek = seq_lseek,
+        .release = seq_release,
 };
 
 static const struct file_operations ftrace_event_id_fops = {
@@ -963,35 +1099,31 @@ event_create_dir(struct ftrace_event_call *call, struct dentry *d_events,
                 return -1;
         }
 
-        if (call->class->probe || call->class->reg)
+        if (call->class->reg)
                 trace_create_file("enable", 0644, call->dir, call,
                                   enable);
 
 #ifdef CONFIG_PERF_EVENTS
-        if (call->event.type && (call->class->perf_probe || call->class->reg))
+        if (call->event.type && call->class->reg)
                 trace_create_file("id", 0444, call->dir, call,
                                   id);
 #endif
 
-        if (call->class->define_fields) {
-                /*
-                 * Other events may have the same class. Only update
-                 * the fields if they are not already defined.
-                 */
-                head = trace_get_fields(call);
-                if (list_empty(head)) {
-                        ret = trace_define_common_fields(call);
-                        if (!ret)
-                                ret = call->class->define_fields(call);
-                        if (ret < 0) {
-                                pr_warning("Could not initialize trace point"
-                                           " events/%s\n", call->name);
-                                return ret;
-                        }
+        /*
+         * Other events may have the same class. Only update
+         * the fields if they are not already defined.
+         */
+        head = trace_get_fields(call);
+        if (list_empty(head)) {
+                ret = call->class->define_fields(call);
+                if (ret < 0) {
+                        pr_warning("Could not initialize trace point"
+                                   " events/%s\n", call->name);
+                        return ret;
                 }
-                trace_create_file("filter", 0644, call->dir, call,
-                                  filter);
         }
+        trace_create_file("filter", 0644, call->dir, call,
+                          filter);
 
         trace_create_file("format", 0444, call->dir, call,
                           format);
@@ -999,11 +1131,17 @@ event_create_dir(struct ftrace_event_call *call, struct dentry *d_events,
         return 0;
 }
 
-static int __trace_add_event_call(struct ftrace_event_call *call)
+static int
+__trace_add_event_call(struct ftrace_event_call *call, struct module *mod,
+                       const struct file_operations *id,
+                       const struct file_operations *enable,
+                       const struct file_operations *filter,
+                       const struct file_operations *format)
 {
         struct dentry *d_events;
         int ret;
 
+        /* The linker may leave blanks */
         if (!call->name)
                 return -EINVAL;
 
@@ -1011,8 +1149,8 @@ static int __trace_add_event_call(struct ftrace_event_call *call)
                 ret = call->class->raw_init(call);
                 if (ret < 0) {
                         if (ret != -ENOSYS)
-                                pr_warning("Could not initialize trace "
-                                "events/%s\n", call->name);
+                                pr_warning("Could not initialize trace events/%s\n",
+                                           call->name);
                         return ret;
                 }
         }
@@ -1021,11 +1159,10 @@ static int __trace_add_event_call(struct ftrace_event_call *call)
         if (!d_events)
                 return -ENOENT;
 
-        ret = event_create_dir(call, d_events, &ftrace_event_id_fops,
-                                &ftrace_enable_fops, &ftrace_event_filter_fops,
-                                &ftrace_event_format_fops);
+        ret = event_create_dir(call, d_events, id, enable, filter, format);
         if (!ret)
                 list_add(&call->list, &ftrace_events);
+        call->mod = mod;
 
         return ret;
 }
@@ -1035,7 +1172,10 @@ int trace_add_event_call(struct ftrace_event_call *call)
 {
         int ret;
         mutex_lock(&event_mutex);
-        ret = __trace_add_event_call(call);
+        ret = __trace_add_event_call(call, NULL, &ftrace_event_id_fops,
+                                     &ftrace_enable_fops,
+                                     &ftrace_event_filter_fops,
+                                     &ftrace_event_format_fops);
         mutex_unlock(&event_mutex);
         return ret;
 }
@@ -1152,8 +1292,6 @@ static void trace_module_add_events(struct module *mod)
 {
         struct ftrace_module_file_ops *file_ops = NULL;
         struct ftrace_event_call *call, *start, *end;
-        struct dentry *d_events;
-        int ret;
 
         start = mod->trace_events;
         end = mod->trace_events + mod->num_trace_events;
@@ -1161,38 +1299,14 @@ static void trace_module_add_events(struct module *mod)
         if (start == end)
                 return;
 
-        d_events = event_trace_events_dir();
-        if (!d_events)
+        file_ops = trace_create_file_ops(mod);
+        if (!file_ops)
                 return;
 
         for_each_event(call, start, end) {
-                /* The linker may leave blanks */
-                if (!call->name)
-                        continue;
-                if (call->class->raw_init) {
-                        ret = call->class->raw_init(call);
-                        if (ret < 0) {
-                                if (ret != -ENOSYS)
-                                        pr_warning("Could not initialize trace "
-                                        "point events/%s\n", call->name);
-                                continue;
-                        }
-                }
-                /*
-                 * This module has events, create file ops for this module
-                 * if not already done.
-                 */
-                if (!file_ops) {
-                        file_ops = trace_create_file_ops(mod);
-                        if (!file_ops)
-                                return;
-                }
-                call->mod = mod;
-                ret = event_create_dir(call, d_events,
+                __trace_add_event_call(call, mod,
                                        &file_ops->id, &file_ops->enable,
                                        &file_ops->filter, &file_ops->format);
-                if (!ret)
-                        list_add(&call->list, &ftrace_events);
         }
 }
 
@@ -1319,25 +1433,14 @@ static __init int event_trace_init(void)
         trace_create_file("enable", 0644, d_events,
                           NULL, &ftrace_system_enable_fops);
 
+        if (trace_define_common_fields())
+                pr_warning("tracing: Failed to allocate common fields");
+
         for_each_event(call, __start_ftrace_events, __stop_ftrace_events) {
-                /* The linker may leave blanks */
-                if (!call->name)
-                        continue;
-                if (call->class->raw_init) {
-                        ret = call->class->raw_init(call);
-                        if (ret < 0) {
-                                if (ret != -ENOSYS)
-                                        pr_warning("Could not initialize trace "
-                                        "point events/%s\n", call->name);
-                                continue;
-                        }
-                }
-                ret = event_create_dir(call, d_events, &ftrace_event_id_fops,
+                __trace_add_event_call(call, NULL, &ftrace_event_id_fops,
                                        &ftrace_enable_fops,
                                        &ftrace_event_filter_fops,
                                        &ftrace_event_format_fops);
-                if (!ret)
-                        list_add(&call->list, &ftrace_events);
         }
 
         while (true) {
@@ -1524,12 +1627,11 @@ function_test_events_call(unsigned long ip, unsigned long parent_ip)
         struct ftrace_entry *entry;
         unsigned long flags;
         long disabled;
-        int resched;
         int cpu;
         int pc;
 
         pc = preempt_count();
-        resched = ftrace_preempt_disable();
+        preempt_disable_notrace();
         cpu = raw_smp_processor_id();
         disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu));
 
@@ -1551,7 +1653,7 @@ function_test_events_call(unsigned long ip, unsigned long parent_ip)
 
  out:
         atomic_dec(&per_cpu(ftrace_test_event_disable, cpu));
-        ftrace_preempt_enable(resched);
+        preempt_enable_notrace();
 }
 
 static struct ftrace_ops trace_ops __initdata  =
diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index 57bb1bb32999..36d40104b17f 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -497,12 +497,10 @@ void print_subsystem_event_filter(struct event_subsystem *system,
 }
 
 static struct ftrace_event_field *
-find_event_field(struct ftrace_event_call *call, char *name)
+__find_event_field(struct list_head *head, char *name)
 {
         struct ftrace_event_field *field;
-        struct list_head *head;
 
-        head = trace_get_fields(call);
         list_for_each_entry(field, head, link) {
                 if (!strcmp(field->name, name))
                         return field;
@@ -511,6 +509,20 @@ find_event_field(struct ftrace_event_call *call, char *name)
         return NULL;
 }
 
+static struct ftrace_event_field *
+find_event_field(struct ftrace_event_call *call, char *name)
+{
+        struct ftrace_event_field *field;
+        struct list_head *head;
+
+        field = __find_event_field(&ftrace_common_fields, name);
+        if (field)
+                return field;
+
+        head = trace_get_fields(call);
+        return __find_event_field(head, name);
+}
+
 static void filter_free_pred(struct filter_pred *pred)
 {
         if (!pred)
@@ -627,9 +639,6 @@ static int init_subsystem_preds(struct event_subsystem *system)
         int err;
 
         list_for_each_entry(call, &ftrace_events, list) {
-                if (!call->class || !call->class->define_fields)
-                        continue;
-
                 if (strcmp(call->class->system, system->name) != 0)
                         continue;
 
@@ -646,9 +655,6 @@ static void filter_free_subsystem_preds(struct event_subsystem *system)
         struct ftrace_event_call *call;
 
         list_for_each_entry(call, &ftrace_events, list) {
-                if (!call->class || !call->class->define_fields)
-                        continue;
-
                 if (strcmp(call->class->system, system->name) != 0)
                         continue;
 
@@ -1251,9 +1257,6 @@ static int replace_system_preds(struct event_subsystem *system,
         list_for_each_entry(call, &ftrace_events, list) {
                 struct event_filter *filter = call->filter;
 
-                if (!call->class || !call->class->define_fields)
-                        continue;
-
                 if (strcmp(call->class->system, system->name) != 0)
                         continue;
 
diff --git a/kernel/trace/trace_export.c b/kernel/trace/trace_export.c
index 8536e2a65969..4ba44deaac25 100644
--- a/kernel/trace/trace_export.c
+++ b/kernel/trace/trace_export.c
@@ -125,12 +125,6 @@ ftrace_define_fields_##name(struct ftrace_event_call *event_call)	\
 
 #include "trace_entries.h"
 
-static int ftrace_raw_init_event(struct ftrace_event_call *call)
-{
-        INIT_LIST_HEAD(&call->class->fields);
-        return 0;
-}
-
 #undef __entry
 #define __entry REC
 
@@ -158,7 +152,7 @@ static int ftrace_raw_init_event(struct ftrace_event_call *call)
 struct ftrace_event_class event_class_ftrace_##call = {                 \
         .system                 = __stringify(TRACE_SYSTEM),            \
         .define_fields          = ftrace_define_fields_##call,          \
-        .raw_init               = ftrace_raw_init_event,                \
+        .fields                 = LIST_HEAD_INIT(event_class_ftrace_##call.fields),\
 };                                                                      \
                                                                         \
 struct ftrace_event_call __used                                         \
diff --git a/kernel/trace/trace_functions.c b/kernel/trace/trace_functions.c
index b3f3776b0cd6..16aee4d44e8f 100644
--- a/kernel/trace/trace_functions.c
+++ b/kernel/trace/trace_functions.c
@@ -54,14 +54,14 @@ function_trace_call_preempt_only(unsigned long ip, unsigned long parent_ip)
         struct trace_array_cpu *data;
         unsigned long flags;
         long disabled;
-        int cpu, resched;
+        int cpu;
         int pc;
 
         if (unlikely(!ftrace_function_enabled))
                 return;
 
         pc = preempt_count();
-        resched = ftrace_preempt_disable();
+        preempt_disable_notrace();
         local_save_flags(flags);
         cpu = raw_smp_processor_id();
         data = tr->data[cpu];
@@ -71,7 +71,7 @@ function_trace_call_preempt_only(unsigned long ip, unsigned long parent_ip)
                 trace_function(tr, ip, parent_ip, flags, pc);
 
         atomic_dec(&data->disabled);
-        ftrace_preempt_enable(resched);
+        preempt_enable_notrace();
 }
 
 static void
diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
index 79f4bac99a94..6f233698518e 100644
--- a/kernel/trace/trace_functions_graph.c
+++ b/kernel/trace/trace_functions_graph.c
@@ -507,7 +507,15 @@ get_return_for_leaf(struct trace_iterator *iter,
                          * if the output fails.
                          */
                         data->ent = *curr;
-                        data->ret = *next;
+                        /*
+                         * If the next event is not a return type, then
+                         * we only care about what type it is. Otherwise we can
+                         * safely copy the entire event.
+                         */
+                        if (next->ent.type == TRACE_GRAPH_RET)
+                                data->ret = *next;
+                        else
+                                data->ret.ent.type = next->ent.type;
                 }
         }
 
@@ -641,7 +649,8 @@ trace_print_graph_duration(unsigned long long duration, struct trace_seq *s)
 
         /* Print nsecs (we don't want to exceed 7 numbers) */
         if (len < 7) {
-                snprintf(nsecs_str, 8 - len, "%03lu", nsecs_rem);
+                snprintf(nsecs_str, min(sizeof(nsecs_str), 8UL - len), "%03lu",
+                         nsecs_rem);
                 ret = trace_seq_printf(s, ".%s", nsecs_str);
                 if (!ret)
                         return TRACE_TYPE_PARTIAL_LINE;
diff --git a/kernel/trace/trace_irqsoff.c b/kernel/trace/trace_irqsoff.c
index 6fd486e0cef4..73a6b0601f2e 100644
--- a/kernel/trace/trace_irqsoff.c
+++ b/kernel/trace/trace_irqsoff.c
@@ -649,6 +649,7 @@ static struct tracer irqsoff_tracer __read_mostly =
 #endif
         .open           = irqsoff_trace_open,
         .close          = irqsoff_trace_close,
+        .use_max_tr     = 1,
 };
 # define register_irqsoff(trace) register_tracer(&trace)
 #else
@@ -681,6 +682,7 @@ static struct tracer preemptoff_tracer __read_mostly =
 #endif
         .open           = irqsoff_trace_open,
         .close          = irqsoff_trace_close,
+        .use_max_tr     = 1,
 };
 # define register_preemptoff(trace) register_tracer(&trace)
 #else
@@ -715,6 +717,7 @@ static struct tracer preemptirqsoff_tracer __read_mostly =
 #endif
         .open           = irqsoff_trace_open,
         .close          = irqsoff_trace_close,
+        .use_max_tr     = 1,
 };
 
 # define register_preemptirqsoff(trace) register_tracer(&trace)
diff --git a/kernel/trace/trace_kdb.c b/kernel/trace/trace_kdb.c
new file mode 100644
index 000000000000..7b8ecd751d93
--- /dev/null
+++ b/kernel/trace/trace_kdb.c
@@ -0,0 +1,136 @@
+/*
+ * kdb helper for dumping the ftrace buffer
+ *
+ * Copyright (C) 2010 Jason Wessel <jason.wessel@windriver.com>
+ *
+ * ftrace_dump_buf based on ftrace_dump:
+ * Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com>
+ * Copyright (C) 2008 Ingo Molnar <mingo@redhat.com>
+ *
+ */
+#include <linux/init.h>
+#include <linux/kgdb.h>
+#include <linux/kdb.h>
+#include <linux/ftrace.h>
+
+#include "../debug/kdb/kdb_private.h"
+#include "trace.h"
+#include "trace_output.h"
+
+static void ftrace_dump_buf(int skip_lines, long cpu_file)
+{
+        /* use static because iter can be a bit big for the stack */
+        static struct trace_iterator iter;
+        unsigned int old_userobj;
+        int cnt = 0, cpu;
+
+        trace_init_global_iter(&iter);
+
+        for_each_tracing_cpu(cpu) {
+                atomic_inc(&iter.tr->data[cpu]->disabled);
+        }
+
+        old_userobj = trace_flags;
+
+        /* don't look at user memory in panic mode */
+        trace_flags &= ~TRACE_ITER_SYM_USEROBJ;
+
+        kdb_printf("Dumping ftrace buffer:\n");
+
+        /* reset all but tr, trace, and overruns */
+        memset(&iter.seq, 0,
+                   sizeof(struct trace_iterator) -
+                   offsetof(struct trace_iterator, seq));
+        iter.iter_flags |= TRACE_FILE_LAT_FMT;
+        iter.pos = -1;
+
+        if (cpu_file == TRACE_PIPE_ALL_CPU) {
+                for_each_tracing_cpu(cpu) {
+                        iter.buffer_iter[cpu] =
+                        ring_buffer_read_prepare(iter.tr->buffer, cpu);
+                        ring_buffer_read_start(iter.buffer_iter[cpu]);
+                        tracing_iter_reset(&iter, cpu);
+                }
+        } else {
+                iter.cpu_file = cpu_file;
+                iter.buffer_iter[cpu_file] =
+                        ring_buffer_read_prepare(iter.tr->buffer, cpu_file);
+                ring_buffer_read_start(iter.buffer_iter[cpu_file]);
+                tracing_iter_reset(&iter, cpu_file);
+        }
+        if (!trace_empty(&iter))
+                trace_find_next_entry_inc(&iter);
+        while (!trace_empty(&iter)) {
+                if (!cnt)
+                        kdb_printf("---------------------------------\n");
+                cnt++;
+
+                if (trace_find_next_entry_inc(&iter) != NULL && !skip_lines)
+                        print_trace_line(&iter);
+                if (!skip_lines)
+                        trace_printk_seq(&iter.seq);
+                else
+                        skip_lines--;
+                if (KDB_FLAG(CMD_INTERRUPT))
+                        goto out;
+        }
+
+        if (!cnt)
+                kdb_printf("   (ftrace buffer empty)\n");
+        else
+                kdb_printf("---------------------------------\n");
+
+out:
+        trace_flags = old_userobj;
+
+        for_each_tracing_cpu(cpu) {
+                atomic_dec(&iter.tr->data[cpu]->disabled);
+        }
+
+        for_each_tracing_cpu(cpu)
+                if (iter.buffer_iter[cpu])
+                        ring_buffer_read_finish(iter.buffer_iter[cpu]);
+}
+
+/*
+ * kdb_ftdump - Dump the ftrace log buffer
+ */
+static int kdb_ftdump(int argc, const char **argv)
+{
+        int skip_lines = 0;
+        long cpu_file;
+        char *cp;
+
+        if (argc > 2)
+                return KDB_ARGCOUNT;
+
+        if (argc) {
+                skip_lines = simple_strtol(argv[1], &cp, 0);
+                if (*cp)
+                        skip_lines = 0;
+        }
+
+        if (argc == 2) {
+                cpu_file = simple_strtol(argv[2], &cp, 0);
+                if (*cp || cpu_file >= NR_CPUS || cpu_file < 0 ||
+                    !cpu_online(cpu_file))
+                        return KDB_BADINT;
+        } else {
+                cpu_file = TRACE_PIPE_ALL_CPU;
+        }
+
+        kdb_trap_printk++;
+        ftrace_dump_buf(skip_lines, cpu_file);
+        kdb_trap_printk--;
+
+        return 0;
+}
+
+static __init int kdb_ftrace_register(void)
+{
+        kdb_register_repeat("ftdump", kdb_ftdump, "[skip_#lines] [cpu]",
+                            "Dump ftrace log", 0, KDB_REPEAT_NONE);
+        return 0;
+}
+
+late_initcall(kdb_ftrace_register);
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index f52b5f50299d..8b27c9849b42 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -30,6 +30,8 @@
 #include <linux/ptrace.h>
 #include <linux/perf_event.h>
 #include <linux/stringify.h>
+#include <linux/limits.h>
+#include <linux/uaccess.h>
 #include <asm/bitsperlong.h>
 
 #include "trace.h"
@@ -38,6 +40,7 @@
 #define MAX_TRACE_ARGS 128
 #define MAX_ARGSTR_LEN 63
 #define MAX_EVENT_NAME_LEN 64
+#define MAX_STRING_SIZE PATH_MAX
 #define KPROBE_EVENT_SYSTEM "kprobes"
 
 /* Reserved field names */
@@ -58,14 +61,16 @@ const char *reserved_field_names[] = {
 };
 
 /* Printing function type */
-typedef int (*print_type_func_t)(struct trace_seq *, const char *, void *);
+typedef int (*print_type_func_t)(struct trace_seq *, const char *, void *,
+                                 void *);
 #define PRINT_TYPE_FUNC_NAME(type)      print_type_##type
 #define PRINT_TYPE_FMT_NAME(type)       print_type_format_##type
 
 /* Printing  in basic type function template */
 #define DEFINE_BASIC_PRINT_TYPE_FUNC(type, fmt, cast)                   \
 static __kprobes int PRINT_TYPE_FUNC_NAME(type)(struct trace_seq *s,    \
-                                                const char *name, void *data)\
+                                                const char *name,       \
+                                                void *data, void *ent)\
 {                                                                       \
         return trace_seq_printf(s, " %s=" fmt, name, (cast)*(type *)data);\
 }                                                                       \
@@ -80,6 +85,49 @@ DEFINE_BASIC_PRINT_TYPE_FUNC(s16, "%d", int)
 DEFINE_BASIC_PRINT_TYPE_FUNC(s32, "%ld", long)
 DEFINE_BASIC_PRINT_TYPE_FUNC(s64, "%lld", long long)
 
+/* data_rloc: data relative location, compatible with u32 */
+#define make_data_rloc(len, roffs)      \
+        (((u32)(len) << 16) | ((u32)(roffs) & 0xffff))
+#define get_rloc_len(dl)        ((u32)(dl) >> 16)
+#define get_rloc_offs(dl)       ((u32)(dl) & 0xffff)
+
+static inline void *get_rloc_data(u32 *dl)
+{
+        return (u8 *)dl + get_rloc_offs(*dl);
+}
+
+/* For data_loc conversion */
+static inline void *get_loc_data(u32 *dl, void *ent)
+{
+        return (u8 *)ent + get_rloc_offs(*dl);
+}
+
+/*
+ * Convert data_rloc to data_loc:
+ *  data_rloc stores the offset from data_rloc itself, but data_loc
+ *  stores the offset from event entry.
+ */
+#define convert_rloc_to_loc(dl, offs)   ((u32)(dl) + (offs))
+
+/* For defining macros, define string/string_size types */
+typedef u32 string;
+typedef u32 string_size;
+
+/* Print type function for string type */
+static __kprobes int PRINT_TYPE_FUNC_NAME(string)(struct trace_seq *s,
+                                                  const char *name,
+                                                  void *data, void *ent)
+{
+        int len = *(u32 *)data >> 16;
+
+        if (!len)
+                return trace_seq_printf(s, " %s=(fault)", name);
+        else
+                return trace_seq_printf(s, " %s=\"%s\"", name,
+                                        (const char *)get_loc_data(data, ent));
+}
+static const char PRINT_TYPE_FMT_NAME(string)[] = "\\\"%s\\\"";
+
 /* Data fetch function type */
 typedef void (*fetch_func_t)(struct pt_regs *, void *, void *);
 
@@ -94,32 +142,38 @@ static __kprobes void call_fetch(struct fetch_param *fprm,
         return fprm->fn(regs, fprm->data, dest);
 }
 
-#define FETCH_FUNC_NAME(kind, type)     fetch_##kind##_##type
+#define FETCH_FUNC_NAME(method, type)   fetch_##method##_##type
 /*
  * Define macro for basic types - we don't need to define s* types, because
  * we have to care only about bitwidth at recording time.
  */
-#define DEFINE_BASIC_FETCH_FUNCS(kind)  \
-DEFINE_FETCH_##kind(u8)                 \
-DEFINE_FETCH_##kind(u16)                \
-DEFINE_FETCH_##kind(u32)                \
-DEFINE_FETCH_##kind(u64)
-
-#define CHECK_BASIC_FETCH_FUNCS(kind, fn)       \
-        ((FETCH_FUNC_NAME(kind, u8) == fn) ||   \
-         (FETCH_FUNC_NAME(kind, u16) == fn) ||  \
-         (FETCH_FUNC_NAME(kind, u32) == fn) ||  \
-         (FETCH_FUNC_NAME(kind, u64) == fn))
+#define DEFINE_BASIC_FETCH_FUNCS(method) \
+DEFINE_FETCH_##method(u8)               \
+DEFINE_FETCH_##method(u16)              \
+DEFINE_FETCH_##method(u32)              \
+DEFINE_FETCH_##method(u64)
+
+#define CHECK_FETCH_FUNCS(method, fn)                   \
+        (((FETCH_FUNC_NAME(method, u8) == fn) ||        \
+          (FETCH_FUNC_NAME(method, u16) == fn) ||       \
+          (FETCH_FUNC_NAME(method, u32) == fn) ||       \
+          (FETCH_FUNC_NAME(method, u64) == fn) ||       \
+          (FETCH_FUNC_NAME(method, string) == fn) ||    \
+          (FETCH_FUNC_NAME(method, string_size) == fn)) \
+         && (fn != NULL))
 
 /* Data fetch function templates */
 #define DEFINE_FETCH_reg(type)                                          \
 static __kprobes void FETCH_FUNC_NAME(reg, type)(struct pt_regs *regs,  \
-                                          void *offset, void *dest)     \
+                                        void *offset, void *dest)       \
 {                                                                       \
         *(type *)dest = (type)regs_get_register(regs,                   \
                                 (unsigned int)((unsigned long)offset)); \
 }
 DEFINE_BASIC_FETCH_FUNCS(reg)
+/* No string on the register */
+#define fetch_reg_string NULL
+#define fetch_reg_string_size NULL
 
 #define DEFINE_FETCH_stack(type)                                        \
 static __kprobes void FETCH_FUNC_NAME(stack, type)(struct pt_regs *regs,\
@@ -129,6 +183,9 @@ static __kprobes void FETCH_FUNC_NAME(stack, type)(struct pt_regs *regs,\
                                 (unsigned int)((unsigned long)offset)); \
 }
 DEFINE_BASIC_FETCH_FUNCS(stack)
+/* No string on the stack entry */
+#define fetch_stack_string NULL
+#define fetch_stack_string_size NULL
 
 #define DEFINE_FETCH_retval(type)                                       \
 static __kprobes void FETCH_FUNC_NAME(retval, type)(struct pt_regs *regs,\
@@ -137,6 +194,9 @@ static __kprobes void FETCH_FUNC_NAME(retval, type)(struct pt_regs *regs,\
         *(type *)dest = (type)regs_return_value(regs);                  \
 }
 DEFINE_BASIC_FETCH_FUNCS(retval)
+/* No string on the retval */
+#define fetch_retval_string NULL
+#define fetch_retval_string_size NULL
 
 #define DEFINE_FETCH_memory(type)                                       \
 static __kprobes void FETCH_FUNC_NAME(memory, type)(struct pt_regs *regs,\
@@ -149,6 +209,62 @@ static __kprobes void FETCH_FUNC_NAME(memory, type)(struct pt_regs *regs,\
                 *(type *)dest = retval;                                 \
 }
 DEFINE_BASIC_FETCH_FUNCS(memory)
+/*
+ * Fetch a null-terminated string. Caller MUST set *(u32 *)dest with max
+ * length and relative data location.
+ */
+static __kprobes void FETCH_FUNC_NAME(memory, string)(struct pt_regs *regs,
+                                                      void *addr, void *dest)
+{
+        long ret;
+        int maxlen = get_rloc_len(*(u32 *)dest);
+        u8 *dst = get_rloc_data(dest);
+        u8 *src = addr;
+        mm_segment_t old_fs = get_fs();
+        if (!maxlen)
+                return;
+        /*
+         * Try to get string again, since the string can be changed while
+         * probing.
+         */
+        set_fs(KERNEL_DS);
+        pagefault_disable();
+        do
+                ret = __copy_from_user_inatomic(dst++, src++, 1);
+        while (dst[-1] && ret == 0 && src - (u8 *)addr < maxlen);
+        dst[-1] = '\0';
+        pagefault_enable();
+        set_fs(old_fs);
+
+        if (ret < 0) {  /* Failed to fetch string */
+                ((u8 *)get_rloc_data(dest))[0] = '\0';
+                *(u32 *)dest = make_data_rloc(0, get_rloc_offs(*(u32 *)dest));
+        } else
+                *(u32 *)dest = make_data_rloc(src - (u8 *)addr,
+                                              get_rloc_offs(*(u32 *)dest));
+}
+/* Return the length of string -- including null terminal byte */
+static __kprobes void FETCH_FUNC_NAME(memory, string_size)(struct pt_regs *regs,
+                                                        void *addr, void *dest)
+{
+        int ret, len = 0;
+        u8 c;
+        mm_segment_t old_fs = get_fs();
+
+        set_fs(KERNEL_DS);
+        pagefault_disable();
+        do {
+                ret = __copy_from_user_inatomic(&c, (u8 *)addr + len, 1);
+                len++;
+        } while (c && ret == 0 && len < MAX_STRING_SIZE);
+        pagefault_enable();
+        set_fs(old_fs);
+
+        if (ret < 0)    /* Failed to check the length */
+                *(u32 *)dest = 0;
+        else
+                *(u32 *)dest = len;
+}
 
 /* Memory fetching by symbol */
 struct symbol_cache {
@@ -203,6 +319,8 @@ static __kprobes void FETCH_FUNC_NAME(symbol, type)(struct pt_regs *regs,\
                 *(type *)dest = 0;                                      \
 }
 DEFINE_BASIC_FETCH_FUNCS(symbol)
+DEFINE_FETCH_symbol(string)
+DEFINE_FETCH_symbol(string_size)
 
 /* Dereference memory access function */
 struct deref_fetch_param {
@@ -224,12 +342,14 @@ static __kprobes void FETCH_FUNC_NAME(deref, type)(struct pt_regs *regs,\
                 *(type *)dest = 0;                                      \
 }
 DEFINE_BASIC_FETCH_FUNCS(deref)
+DEFINE_FETCH_deref(string)
+DEFINE_FETCH_deref(string_size)
 
 static __kprobes void free_deref_fetch_param(struct deref_fetch_param *data)
 {
-        if (CHECK_BASIC_FETCH_FUNCS(deref, data->orig.fn))
+        if (CHECK_FETCH_FUNCS(deref, data->orig.fn))
                 free_deref_fetch_param(data->orig.data);
-        else if (CHECK_BASIC_FETCH_FUNCS(symbol, data->orig.fn))
+        else if (CHECK_FETCH_FUNCS(symbol, data->orig.fn))
                 free_symbol_cache(data->orig.data);
         kfree(data);
 }
@@ -240,23 +360,43 @@ static __kprobes void free_deref_fetch_param(struct deref_fetch_param *data)
 #define DEFAULT_FETCH_TYPE _DEFAULT_FETCH_TYPE(BITS_PER_LONG)
 #define DEFAULT_FETCH_TYPE_STR __stringify(DEFAULT_FETCH_TYPE)
 
-#define ASSIGN_FETCH_FUNC(kind, type)   \
-        .kind = FETCH_FUNC_NAME(kind, type)
-
-#define ASSIGN_FETCH_TYPE(ptype, ftype, sign)   \
-        {.name = #ptype,                        \
-         .size = sizeof(ftype),                 \
-         .is_signed = sign,                     \
-         .print = PRINT_TYPE_FUNC_NAME(ptype),  \
-         .fmt = PRINT_TYPE_FMT_NAME(ptype),     \
-ASSIGN_FETCH_FUNC(reg, ftype),                  \
-ASSIGN_FETCH_FUNC(stack, ftype),                \
-ASSIGN_FETCH_FUNC(retval, ftype),               \
-ASSIGN_FETCH_FUNC(memory, ftype),               \
-ASSIGN_FETCH_FUNC(symbol, ftype),               \
-ASSIGN_FETCH_FUNC(deref, ftype),                \
+/* Fetch types */
+enum {
+        FETCH_MTD_reg = 0,
+        FETCH_MTD_stack,
+        FETCH_MTD_retval,
+        FETCH_MTD_memory,
+        FETCH_MTD_symbol,
+        FETCH_MTD_deref,
+        FETCH_MTD_END,
+};
+
+#define ASSIGN_FETCH_FUNC(method, type) \
+        [FETCH_MTD_##method] = FETCH_FUNC_NAME(method, type)
+
+#define __ASSIGN_FETCH_TYPE(_name, ptype, ftype, _size, sign, _fmttype) \
+        {.name = _name,                         \
+         .size = _size,                                 \
+         .is_signed = sign,                             \
+         .print = PRINT_TYPE_FUNC_NAME(ptype),          \
+         .fmt = PRINT_TYPE_FMT_NAME(ptype),             \
+         .fmttype = _fmttype,                           \
+         .fetch = {                                     \
+ASSIGN_FETCH_FUNC(reg, ftype),                          \
+ASSIGN_FETCH_FUNC(stack, ftype),                        \
+ASSIGN_FETCH_FUNC(retval, ftype),                       \
+ASSIGN_FETCH_FUNC(memory, ftype),                       \
+ASSIGN_FETCH_FUNC(symbol, ftype),                       \
+ASSIGN_FETCH_FUNC(deref, ftype),                        \
+          }                                             \
         }
 
+#define ASSIGN_FETCH_TYPE(ptype, ftype, sign)                   \
+        __ASSIGN_FETCH_TYPE(#ptype, ptype, ftype, sizeof(ftype), sign, #ptype)
+
+#define FETCH_TYPE_STRING 0
+#define FETCH_TYPE_STRSIZE 1
+
 /* Fetch type information table */
 static const struct fetch_type {
         const char      *name;          /* Name of type */
@@ -264,14 +404,16 @@ static const struct fetch_type {
         int             is_signed;      /* Signed flag */
         print_type_func_t       print;  /* Print functions */
         const char      *fmt;           /* Fromat string */
+        const char      *fmttype;       /* Name in format file */
         /* Fetch functions */
-        fetch_func_t    reg;
-        fetch_func_t    stack;
-        fetch_func_t    retval;
-        fetch_func_t    memory;
-        fetch_func_t    symbol;
-        fetch_func_t    deref;
+        fetch_func_t    fetch[FETCH_MTD_END];
 } fetch_type_table[] = {
+        /* Special types */
+        [FETCH_TYPE_STRING] = __ASSIGN_FETCH_TYPE("string", string, string,
+                                        sizeof(u32), 1, "__data_loc char[]"),
+        [FETCH_TYPE_STRSIZE] = __ASSIGN_FETCH_TYPE("string_size", u32,
+                                        string_size, sizeof(u32), 0, "u32"),
+        /* Basic types */
         ASSIGN_FETCH_TYPE(u8,  u8,  0),
         ASSIGN_FETCH_TYPE(u16, u16, 0),
         ASSIGN_FETCH_TYPE(u32, u32, 0),
@@ -302,12 +444,28 @@ static __kprobes void fetch_stack_address(struct pt_regs *regs,
         *(unsigned long *)dest = kernel_stack_pointer(regs);
 }
 
+static fetch_func_t get_fetch_size_function(const struct fetch_type *type,
+                                            fetch_func_t orig_fn)
+{
+        int i;
+
+        if (type != &fetch_type_table[FETCH_TYPE_STRING])
+                return NULL;    /* Only string type needs size function */
+        for (i = 0; i < FETCH_MTD_END; i++)
+                if (type->fetch[i] == orig_fn)
+                        return fetch_type_table[FETCH_TYPE_STRSIZE].fetch[i];
+
+        WARN_ON(1);     /* This should not happen */
+        return NULL;
+}
+
 /**
  * Kprobe event core functions
  */
 
 struct probe_arg {
         struct fetch_param      fetch;
+        struct fetch_param      fetch_size;
         unsigned int            offset; /* Offset from argument entry */
         const char              *name;  /* Name of this argument */
         const char              *comm;  /* Command of this argument */
@@ -429,9 +587,9 @@ error:
 
 static void free_probe_arg(struct probe_arg *arg)
 {
-        if (CHECK_BASIC_FETCH_FUNCS(deref, arg->fetch.fn))
+        if (CHECK_FETCH_FUNCS(deref, arg->fetch.fn))
                 free_deref_fetch_param(arg->fetch.data);
-        else if (CHECK_BASIC_FETCH_FUNCS(symbol, arg->fetch.fn))
+        else if (CHECK_FETCH_FUNCS(symbol, arg->fetch.fn))
                 free_symbol_cache(arg->fetch.data);
         kfree(arg->name);
         kfree(arg->comm);
@@ -548,7 +706,7 @@ static int parse_probe_vars(char *arg, const struct fetch_type *t,
 
         if (strcmp(arg, "retval") == 0) {
                 if (is_return)
-                        f->fn = t->retval;
+                        f->fn = t->fetch[FETCH_MTD_retval];
                 else
                         ret = -EINVAL;
         } else if (strncmp(arg, "stack", 5) == 0) {
@@ -562,7 +720,7 @@ static int parse_probe_vars(char *arg, const struct fetch_type *t,
                         if (ret || param > PARAM_MAX_STACK)
                                 ret = -EINVAL;
                         else {
-                                f->fn = t->stack;
+                                f->fn = t->fetch[FETCH_MTD_stack];
                                 f->data = (void *)param;
                         }
                 } else
@@ -588,7 +746,7 @@ static int __parse_probe_arg(char *arg, const struct fetch_type *t,
         case '%':       /* named register */
                 ret = regs_query_register_offset(arg + 1);
                 if (ret >= 0) {
-                        f->fn = t->reg;
+                        f->fn = t->fetch[FETCH_MTD_reg];
                         f->data = (void *)(unsigned long)ret;
                         ret = 0;
                 }
@@ -598,7 +756,7 @@ static int __parse_probe_arg(char *arg, const struct fetch_type *t,
                         ret = strict_strtoul(arg + 1, 0, &param);
                         if (ret)
                                 break;
-                        f->fn = t->memory;
+                        f->fn = t->fetch[FETCH_MTD_memory];
                         f->data = (void *)param;
                 } else {
                         ret = split_symbol_offset(arg + 1, &offset);
@@ -606,7 +764,7 @@ static int __parse_probe_arg(char *arg, const struct fetch_type *t,
                                 break;
                         f->data = alloc_symbol_cache(arg + 1, offset);
                         if (f->data)
-                                f->fn = t->symbol;
+                                f->fn = t->fetch[FETCH_MTD_symbol];
                 }
                 break;
         case '+':       /* deref memory */
@@ -636,14 +794,17 @@ static int __parse_probe_arg(char *arg, const struct fetch_type *t,
                         if (ret)
                                 kfree(dprm);
                         else {
-                                f->fn = t->deref;
+                                f->fn = t->fetch[FETCH_MTD_deref];
                                 f->data = (void *)dprm;
                         }
                 }
                 break;
         }
-        if (!ret && !f->fn)
+        if (!ret && !f->fn) {   /* Parsed, but do not find fetch method */
+                pr_info("%s type has no corresponding fetch method.\n",
+                        t->name);
                 ret = -EINVAL;
+        }
         return ret;
 }
 
@@ -652,6 +813,7 @@ static int parse_probe_arg(char *arg, struct trace_probe *tp,
                            struct probe_arg *parg, int is_return)
 {
         const char *t;
+        int ret;
 
         if (strlen(arg) > MAX_ARGSTR_LEN) {
                 pr_info("Argument is too long.: %s\n",  arg);
@@ -674,7 +836,13 @@ static int parse_probe_arg(char *arg, struct trace_probe *tp,
         }
         parg->offset = tp->size;
         tp->size += parg->type->size;
-        return __parse_probe_arg(arg, parg->type, &parg->fetch, is_return);
+        ret = __parse_probe_arg(arg, parg->type, &parg->fetch, is_return);
+        if (ret >= 0) {
+                parg->fetch_size.fn = get_fetch_size_function(parg->type,
+                                                              parg->fetch.fn);
+                parg->fetch_size.data = parg->fetch.data;
+        }
+        return ret;
 }
 
 /* Return 1 if name is reserved or already used by another argument */
@@ -757,14 +925,17 @@ static int create_trace_probe(int argc, char **argv)
                         pr_info("Delete command needs an event name.\n");
                         return -EINVAL;
                 }
+                mutex_lock(&probe_lock);
                 tp = find_probe_event(event, group);
                 if (!tp) {
+                        mutex_unlock(&probe_lock);
                         pr_info("Event %s/%s doesn't exist.\n", group, event);
                         return -ENOENT;
                 }
                 /* delete an event */
                 unregister_trace_probe(tp);
                 free_trace_probe(tp);
+                mutex_unlock(&probe_lock);
                 return 0;
         }
 
@@ -1043,6 +1214,54 @@ static const struct file_operations kprobe_profile_ops = {
         .release        = seq_release,
 };
 
+/* Sum up total data length for dynamic arraies (strings) */
+static __kprobes int __get_data_size(struct trace_probe *tp,
+                                     struct pt_regs *regs)
+{
+        int i, ret = 0;
+        u32 len;
+
+        for (i = 0; i < tp->nr_args; i++)
+                if (unlikely(tp->args[i].fetch_size.fn)) {
+                        call_fetch(&tp->args[i].fetch_size, regs, &len);
+                        ret += len;
+                }
+
+        return ret;
+}
+
+/* Store the value of each argument */
+static __kprobes void store_trace_args(int ent_size, struct trace_probe *tp,
+                                       struct pt_regs *regs,
+                                       u8 *data, int maxlen)
+{
+        int i;
+        u32 end = tp->size;
+        u32 *dl;        /* Data (relative) location */
+
+        for (i = 0; i < tp->nr_args; i++) {
+                if (unlikely(tp->args[i].fetch_size.fn)) {
+                        /*
+                         * First, we set the relative location and
+                         * maximum data length to *dl
+                         */
+                        dl = (u32 *)(data + tp->args[i].offset);
+                        *dl = make_data_rloc(maxlen, end - tp->args[i].offset);
+                        /* Then try to fetch string or dynamic array data */
+                        call_fetch(&tp->args[i].fetch, regs, dl);
+                        /* Reduce maximum length */
+                        end += get_rloc_len(*dl);
+                        maxlen -= get_rloc_len(*dl);
+                        /* Trick here, convert data_rloc to data_loc */
+                        *dl = convert_rloc_to_loc(*dl,
+                                 ent_size + tp->args[i].offset);
+                } else
+                        /* Just fetching data normally */
+                        call_fetch(&tp->args[i].fetch, regs,
+                                   data + tp->args[i].offset);
+        }
+}
+
 /* Kprobe handler */
 static __kprobes void kprobe_trace_func(struct kprobe *kp, struct pt_regs *regs)
 {
@@ -1050,8 +1269,7 @@ static __kprobes void kprobe_trace_func(struct kprobe *kp, struct pt_regs *regs)
         struct kprobe_trace_entry_head *entry;
         struct ring_buffer_event *event;
         struct ring_buffer *buffer;
-        u8 *data;
-        int size, i, pc;
+        int size, dsize, pc;
         unsigned long irq_flags;
         struct ftrace_event_call *call = &tp->call;
 
@@ -1060,7 +1278,8 @@ static __kprobes void kprobe_trace_func(struct kprobe *kp, struct pt_regs *regs)
         local_save_flags(irq_flags);
         pc = preempt_count();
 
-        size = sizeof(*entry) + tp->size;
+        dsize = __get_data_size(tp, regs);
+        size = sizeof(*entry) + tp->size + dsize;
 
         event = trace_current_buffer_lock_reserve(&buffer, call->event.type,
                                                   size, irq_flags, pc);
@@ -1069,9 +1288,7 @@ static __kprobes void kprobe_trace_func(struct kprobe *kp, struct pt_regs *regs)
 
         entry = ring_buffer_event_data(event);
         entry->ip = (unsigned long)kp->addr;
-        data = (u8 *)&entry[1];
-        for (i = 0; i < tp->nr_args; i++)
-                call_fetch(&tp->args[i].fetch, regs, data + tp->args[i].offset);
+        store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize);
 
         if (!filter_current_check_discard(buffer, call, entry, event))
                 trace_nowake_buffer_unlock_commit(buffer, event, irq_flags, pc);
@@ -1085,15 +1302,15 @@ static __kprobes void kretprobe_trace_func(struct kretprobe_instance *ri,
         struct kretprobe_trace_entry_head *entry;
         struct ring_buffer_event *event;
         struct ring_buffer *buffer;
-        u8 *data;
-        int size, i, pc;
+        int size, pc, dsize;
         unsigned long irq_flags;
         struct ftrace_event_call *call = &tp->call;
 
         local_save_flags(irq_flags);
         pc = preempt_count();
 
-        size = sizeof(*entry) + tp->size;
+        dsize = __get_data_size(tp, regs);
+        size = sizeof(*entry) + tp->size + dsize;
 
         event = trace_current_buffer_lock_reserve(&buffer, call->event.type,
                                                   size, irq_flags, pc);
@@ -1103,9 +1320,7 @@ static __kprobes void kretprobe_trace_func(struct kretprobe_instance *ri,
         entry = ring_buffer_event_data(event);
         entry->func = (unsigned long)tp->rp.kp.addr;
         entry->ret_ip = (unsigned long)ri->ret_addr;
-        data = (u8 *)&entry[1];
-        for (i = 0; i < tp->nr_args; i++)
-                call_fetch(&tp->args[i].fetch, regs, data + tp->args[i].offset);
+        store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize);
 
         if (!filter_current_check_discard(buffer, call, entry, event))
                 trace_nowake_buffer_unlock_commit(buffer, event, irq_flags, pc);
@@ -1137,7 +1352,7 @@ print_kprobe_event(struct trace_iterator *iter, int flags,
         data = (u8 *)&field[1];
         for (i = 0; i < tp->nr_args; i++)
                 if (!tp->args[i].type->print(s, tp->args[i].name,
-                                             data + tp->args[i].offset))
+                                             data + tp->args[i].offset, field))
                         goto partial;
 
         if (!trace_seq_puts(s, "\n"))
@@ -1179,7 +1394,7 @@ print_kretprobe_event(struct trace_iterator *iter, int flags,
         data = (u8 *)&field[1];
         for (i = 0; i < tp->nr_args; i++)
                 if (!tp->args[i].type->print(s, tp->args[i].name,
-                                             data + tp->args[i].offset))
+                                             data + tp->args[i].offset, field))
                         goto partial;
 
         if (!trace_seq_puts(s, "\n"))
@@ -1214,11 +1429,6 @@ static void probe_event_disable(struct ftrace_event_call *call)
         }
 }
 
-static int probe_event_raw_init(struct ftrace_event_call *event_call)
-{
-        return 0;
-}
-
 #undef DEFINE_FIELD
 #define DEFINE_FIELD(type, item, name, is_signed)                       \
         do {                                                            \
@@ -1239,7 +1449,7 @@ static int kprobe_event_define_fields(struct ftrace_event_call *event_call)
         DEFINE_FIELD(unsigned long, ip, FIELD_STRING_IP, 0);
         /* Set argument names as fields */
         for (i = 0; i < tp->nr_args; i++) {
-                ret = trace_define_field(event_call, tp->args[i].type->name,
+                ret = trace_define_field(event_call, tp->args[i].type->fmttype,
                                          tp->args[i].name,
                                          sizeof(field) + tp->args[i].offset,
                                          tp->args[i].type->size,
@@ -1261,7 +1471,7 @@ static int kretprobe_event_define_fields(struct ftrace_event_call *event_call)
         DEFINE_FIELD(unsigned long, ret_ip, FIELD_STRING_RETIP, 0);
         /* Set argument names as fields */
         for (i = 0; i < tp->nr_args; i++) {
-                ret = trace_define_field(event_call, tp->args[i].type->name,
+                ret = trace_define_field(event_call, tp->args[i].type->fmttype,
                                          tp->args[i].name,
                                          sizeof(field) + tp->args[i].offset,
                                          tp->args[i].type->size,
@@ -1301,8 +1511,13 @@ static int __set_print_fmt(struct trace_probe *tp, char *buf, int len)
         pos += snprintf(buf + pos, LEN_OR_ZERO, "\", %s", arg);
 
         for (i = 0; i < tp->nr_args; i++) {
-                pos += snprintf(buf + pos, LEN_OR_ZERO, ", REC->%s",
-                                tp->args[i].name);
+                if (strcmp(tp->args[i].type->name, "string") == 0)
+                        pos += snprintf(buf + pos, LEN_OR_ZERO,
+                                        ", __get_str(%s)",
+                                        tp->args[i].name);
+                else
+                        pos += snprintf(buf + pos, LEN_OR_ZERO, ", REC->%s",
+                                        tp->args[i].name);
         }
 
 #undef LEN_OR_ZERO
@@ -1339,11 +1554,11 @@ static __kprobes void kprobe_perf_func(struct kprobe *kp,
         struct ftrace_event_call *call = &tp->call;
         struct kprobe_trace_entry_head *entry;
         struct hlist_head *head;
-        u8 *data;
-        int size, __size, i;
+        int size, __size, dsize;
         int rctx;
 
-        __size = sizeof(*entry) + tp->size;
+        dsize = __get_data_size(tp, regs);
+        __size = sizeof(*entry) + tp->size + dsize;
         size = ALIGN(__size + sizeof(u32), sizeof(u64));
         size -= sizeof(u32);
         if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE,
@@ -1355,9 +1570,8 @@ static __kprobes void kprobe_perf_func(struct kprobe *kp,
                 return;
 
         entry->ip = (unsigned long)kp->addr;
-        data = (u8 *)&entry[1];
-        for (i = 0; i < tp->nr_args; i++)
-                call_fetch(&tp->args[i].fetch, regs, data + tp->args[i].offset);
+        memset(&entry[1], 0, dsize);
+        store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize);
 
         head = this_cpu_ptr(call->perf_events);
         perf_trace_buf_submit(entry, size, rctx, entry->ip, 1, regs, head);
@@ -1371,11 +1585,11 @@ static __kprobes void kretprobe_perf_func(struct kretprobe_instance *ri,
         struct ftrace_event_call *call = &tp->call;
         struct kretprobe_trace_entry_head *entry;
         struct hlist_head *head;
-        u8 *data;
-        int size, __size, i;
+        int size, __size, dsize;
         int rctx;
 
-        __size = sizeof(*entry) + tp->size;
+        dsize = __get_data_size(tp, regs);
+        __size = sizeof(*entry) + tp->size + dsize;
         size = ALIGN(__size + sizeof(u32), sizeof(u64));
         size -= sizeof(u32);
         if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE,
@@ -1388,9 +1602,7 @@ static __kprobes void kretprobe_perf_func(struct kretprobe_instance *ri,
 
         entry->func = (unsigned long)tp->rp.kp.addr;
         entry->ret_ip = (unsigned long)ri->ret_addr;
-        data = (u8 *)&entry[1];
-        for (i = 0; i < tp->nr_args; i++)
-                call_fetch(&tp->args[i].fetch, regs, data + tp->args[i].offset);
+        store_trace_args(sizeof(*entry), tp, regs, (u8 *)&entry[1], dsize);
 
         head = this_cpu_ptr(call->perf_events);
         perf_trace_buf_submit(entry, size, rctx, entry->ret_ip, 1, regs, head);
@@ -1486,15 +1698,12 @@ static int register_probe_event(struct trace_probe *tp)
         int ret;
 
         /* Initialize ftrace_event_call */
+        INIT_LIST_HEAD(&call->class->fields);
         if (probe_is_return(tp)) {
-                INIT_LIST_HEAD(&call->class->fields);
                 call->event.funcs = &kretprobe_funcs;
-                call->class->raw_init = probe_event_raw_init;
                 call->class->define_fields = kretprobe_event_define_fields;
         } else {
-                INIT_LIST_HEAD(&call->class->fields);
                 call->event.funcs = &kprobe_funcs;
-                call->class->raw_init = probe_event_raw_init;
                 call->class->define_fields = kprobe_event_define_fields;
         }
         if (set_print_fmt(tp) < 0)
diff --git a/kernel/trace/trace_ksym.c b/kernel/trace/trace_ksym.c
deleted file mode 100644
index 8eaf00749b65..000000000000
--- a/kernel/trace/trace_ksym.c
+++ /dev/null
@@ -1,508 +0,0 @@
-/*
- * trace_ksym.c - Kernel Symbol Tracer
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- *
- * Copyright (C) IBM Corporation, 2009
- */
-
-#include <linux/kallsyms.h>
-#include <linux/uaccess.h>
-#include <linux/debugfs.h>
-#include <linux/ftrace.h>
-#include <linux/module.h>
-#include <linux/slab.h>
-#include <linux/fs.h>
-
-#include "trace_output.h"
-#include "trace.h"
-
-#include <linux/hw_breakpoint.h>
-#include <asm/hw_breakpoint.h>
-
-#include <asm/atomic.h>
-
-#define KSYM_TRACER_OP_LEN 3 /* rw- */
-
-struct trace_ksym {
-        struct perf_event       **ksym_hbp;
-        struct perf_event_attr  attr;
-#ifdef CONFIG_PROFILE_KSYM_TRACER
-        atomic64_t              counter;
-#endif
-        struct hlist_node       ksym_hlist;
-};
-
-static struct trace_array *ksym_trace_array;
-
-static unsigned int ksym_tracing_enabled;
-
-static HLIST_HEAD(ksym_filter_head);
-
-static DEFINE_MUTEX(ksym_tracer_mutex);
-
-#ifdef CONFIG_PROFILE_KSYM_TRACER
-
-#define MAX_UL_INT 0xffffffff
-
-void ksym_collect_stats(unsigned long hbp_hit_addr)
-{
-        struct hlist_node *node;
-        struct trace_ksym *entry;
-
-        rcu_read_lock();
-        hlist_for_each_entry_rcu(entry, node, &ksym_filter_head, ksym_hlist) {
-                if (entry->attr.bp_addr == hbp_hit_addr) {
-                        atomic64_inc(&entry->counter);
-                        break;
-                }
-        }
-        rcu_read_unlock();
-}
-#endif /* CONFIG_PROFILE_KSYM_TRACER */
-
-void ksym_hbp_handler(struct perf_event *hbp, int nmi,
-                      struct perf_sample_data *data,
-                      struct pt_regs *regs)
-{
-        struct ring_buffer_event *event;
-        struct ksym_trace_entry *entry;
-        struct ring_buffer *buffer;
-        int pc;
-
-        if (!ksym_tracing_enabled)
-                return;
-
-        buffer = ksym_trace_array->buffer;
-
-        pc = preempt_count();
-
-        event = trace_buffer_lock_reserve(buffer, TRACE_KSYM,
-                                                        sizeof(*entry), 0, pc);
-        if (!event)
-                return;
-
-        entry           = ring_buffer_event_data(event);
-        entry->ip       = instruction_pointer(regs);
-        entry->type     = hw_breakpoint_type(hbp);
-        entry->addr     = hw_breakpoint_addr(hbp);
-        strlcpy(entry->cmd, current->comm, TASK_COMM_LEN);
-
-#ifdef CONFIG_PROFILE_KSYM_TRACER
-        ksym_collect_stats(hw_breakpoint_addr(hbp));
-#endif /* CONFIG_PROFILE_KSYM_TRACER */
-
-        trace_buffer_unlock_commit(buffer, event, 0, pc);
-}
-
-/* Valid access types are represented as
- *
- * rw- : Set Read/Write Access Breakpoint
- * -w- : Set Write Access Breakpoint
- * --- : Clear Breakpoints
- * --x : Set Execution Break points (Not available yet)
- *
- */
-static int ksym_trace_get_access_type(char *str)
-{
-        int access = 0;
-
-        if (str[0] == 'r')
-                access |= HW_BREAKPOINT_R;
-
-        if (str[1] == 'w')
-                access |= HW_BREAKPOINT_W;
-
-        if (str[2] == 'x')
-                access |= HW_BREAKPOINT_X;
-
-        switch (access) {
-        case HW_BREAKPOINT_R:
-        case HW_BREAKPOINT_W:
-        case HW_BREAKPOINT_W | HW_BREAKPOINT_R:
-                return access;
-        default:
-                return -EINVAL;
-        }
-}
-
-/*
- * There can be several possible malformed requests and we attempt to capture
- * all of them. We enumerate some of the rules
- * 1. We will not allow kernel symbols with ':' since it is used as a delimiter.
- *    i.e. multiple ':' symbols disallowed. Possible uses are of the form
- *    <module>:<ksym_name>:<op>.
- * 2. No delimiter symbol ':' in the input string
- * 3. Spurious operator symbols or symbols not in their respective positions
- * 4. <ksym_name>:--- i.e. clear breakpoint request when ksym_name not in file
- * 5. Kernel symbol not a part of /proc/kallsyms
- * 6. Duplicate requests
- */
-static int parse_ksym_trace_str(char *input_string, char **ksymname,
-                                                        unsigned long *addr)
-{
-        int ret;
-
-        *ksymname = strsep(&input_string, ":");
-        *addr = kallsyms_lookup_name(*ksymname);
-
-        /* Check for malformed request: (2), (1) and (5) */
-        if ((!input_string) ||
-            (strlen(input_string) != KSYM_TRACER_OP_LEN) ||
-            (*addr == 0))
-                return -EINVAL;;
-
-        ret = ksym_trace_get_access_type(input_string);
-
-        return ret;
-}
-
-int process_new_ksym_entry(char *ksymname, int op, unsigned long addr)
-{
-        struct trace_ksym *entry;
-        int ret = -ENOMEM;
-
-        entry = kzalloc(sizeof(struct trace_ksym), GFP_KERNEL);
-        if (!entry)
-                return -ENOMEM;
-
-        hw_breakpoint_init(&entry->attr);
-
-        entry->attr.bp_type = op;
-        entry->attr.bp_addr = addr;
-        entry->attr.bp_len = HW_BREAKPOINT_LEN_4;
-
-        entry->ksym_hbp = register_wide_hw_breakpoint(&entry->attr,
-                                        ksym_hbp_handler);
-
-        if (IS_ERR(entry->ksym_hbp)) {
-                ret = PTR_ERR(entry->ksym_hbp);
-                if (ret == -ENOSPC) {
-                        printk(KERN_ERR "ksym_tracer: Maximum limit reached."
-                        " No new requests for tracing can be accepted now.\n");
-                } else {
-                        printk(KERN_INFO "ksym_tracer request failed. Try again"
-                                         " later!!\n");
-                }
-                goto err;
-        }
-
-        hlist_add_head_rcu(&(entry->ksym_hlist), &ksym_filter_head);
-
-        return 0;
-
-err:
-        kfree(entry);
-
-        return ret;
-}
-
-static ssize_t ksym_trace_filter_read(struct file *filp, char __user *ubuf,
-                                                size_t count, loff_t *ppos)
-{
-        struct trace_ksym *entry;
-        struct hlist_node *node;
-        struct trace_seq *s;
-        ssize_t cnt = 0;
-        int ret;
-
-        s = kmalloc(sizeof(*s), GFP_KERNEL);
-        if (!s)
-                return -ENOMEM;
-        trace_seq_init(s);
-
-        mutex_lock(&ksym_tracer_mutex);
-
-        hlist_for_each_entry(entry, node, &ksym_filter_head, ksym_hlist) {
-                ret = trace_seq_printf(s, "%pS:",
-                                (void *)(unsigned long)entry->attr.bp_addr);
-                if (entry->attr.bp_type == HW_BREAKPOINT_R)
-                        ret = trace_seq_puts(s, "r--\n");
-                else if (entry->attr.bp_type == HW_BREAKPOINT_W)
-                        ret = trace_seq_puts(s, "-w-\n");
-                else if (entry->attr.bp_type == (HW_BREAKPOINT_W | HW_BREAKPOINT_R))
-                        ret = trace_seq_puts(s, "rw-\n");
-                WARN_ON_ONCE(!ret);
-        }
-
-        cnt = simple_read_from_buffer(ubuf, count, ppos, s->buffer, s->len);
-
-        mutex_unlock(&ksym_tracer_mutex);
-
-        kfree(s);
-
-        return cnt;
-}
-
-static void __ksym_trace_reset(void)
-{
-        struct trace_ksym *entry;
-        struct hlist_node *node, *node1;
-
-        mutex_lock(&ksym_tracer_mutex);
-        hlist_for_each_entry_safe(entry, node, node1, &ksym_filter_head,
-                                                                ksym_hlist) {
-                unregister_wide_hw_breakpoint(entry->ksym_hbp);
-                hlist_del_rcu(&(entry->ksym_hlist));
-                synchronize_rcu();
-                kfree(entry);
-        }
-        mutex_unlock(&ksym_tracer_mutex);
-}
-
-static ssize_t ksym_trace_filter_write(struct file *file,
-                                        const char __user *buffer,
-                                                size_t count, loff_t *ppos)
-{
-        struct trace_ksym *entry;
-        struct hlist_node *node;
-        char *buf, *input_string, *ksymname = NULL;
-        unsigned long ksym_addr = 0;
-        int ret, op, changed = 0;
-
-        buf = kzalloc(count + 1, GFP_KERNEL);
-        if (!buf)
-                return -ENOMEM;
-
-        ret = -EFAULT;
-        if (copy_from_user(buf, buffer, count))
-                goto out;
-
-        buf[count] = '\0';
-        input_string = strstrip(buf);
-
-        /*
-         * Clear all breakpoints if:
-         * 1: echo > ksym_trace_filter
-         * 2: echo 0 > ksym_trace_filter
-         * 3: echo "*:---" > ksym_trace_filter
-         */
-        if (!input_string[0] || !strcmp(input_string, "0") ||
-            !strcmp(input_string, "*:---")) {
-                __ksym_trace_reset();
-                ret = 0;
-                goto out;
-        }
-
-        ret = op = parse_ksym_trace_str(input_string, &ksymname, &ksym_addr);
-        if (ret < 0)
-                goto out;
-
-        mutex_lock(&ksym_tracer_mutex);
-
-        ret = -EINVAL;
-        hlist_for_each_entry(entry, node, &ksym_filter_head, ksym_hlist) {
-                if (entry->attr.bp_addr == ksym_addr) {
-                        /* Check for malformed request: (6) */
-                        if (entry->attr.bp_type != op)
-                                changed = 1;
-                        else
-                                goto out_unlock;
-                        break;
-                }
-        }
-        if (changed) {
-                unregister_wide_hw_breakpoint(entry->ksym_hbp);
-                entry->attr.bp_type = op;
-                ret = 0;
-                if (op > 0) {
-                        entry->ksym_hbp =
-                                register_wide_hw_breakpoint(&entry->attr,
-                                        ksym_hbp_handler);
-                        if (IS_ERR(entry->ksym_hbp))
-                                ret = PTR_ERR(entry->ksym_hbp);
-                        else
-                                goto out_unlock;
-                }
-                /* Error or "symbol:---" case: drop it */
-                hlist_del_rcu(&(entry->ksym_hlist));
-                synchronize_rcu();
-                kfree(entry);
-                goto out_unlock;
-        } else {
-                /* Check for malformed request: (4) */
-                if (op)
-                        ret = process_new_ksym_entry(ksymname, op, ksym_addr);
-        }
-out_unlock:
-        mutex_unlock(&ksym_tracer_mutex);
-out:
-        kfree(buf);
-        return !ret ? count : ret;
-}
-
-static const struct file_operations ksym_tracing_fops = {
-        .open           = tracing_open_generic,
-        .read           = ksym_trace_filter_read,
-        .write          = ksym_trace_filter_write,
-};
-
-static void ksym_trace_reset(struct trace_array *tr)
-{
-        ksym_tracing_enabled = 0;
-        __ksym_trace_reset();
-}
-
-static int ksym_trace_init(struct trace_array *tr)
-{
-        int cpu, ret = 0;
-
-        for_each_online_cpu(cpu)
-                tracing_reset(tr, cpu);
-        ksym_tracing_enabled = 1;
-        ksym_trace_array = tr;
-
-        return ret;
-}
-
-static void ksym_trace_print_header(struct seq_file *m)
-{
-        seq_puts(m,
-                 "#       TASK-PID   CPU#      Symbol                    "
-                 "Type    Function\n");
-        seq_puts(m,
-                 "#          |        |          |                       "
-                 " |         |\n");
-}
-
-static enum print_line_t ksym_trace_output(struct trace_iterator *iter)
-{
-        struct trace_entry *entry = iter->ent;
-        struct trace_seq *s = &iter->seq;
-        struct ksym_trace_entry *field;
-        char str[KSYM_SYMBOL_LEN];
-        int ret;
-
-        if (entry->type != TRACE_KSYM)
-                return TRACE_TYPE_UNHANDLED;
-
-        trace_assign_type(field, entry);
-
-        ret = trace_seq_printf(s, "%11s-%-5d [%03d] %pS", field->cmd,
-                                entry->pid, iter->cpu, (char *)field->addr);
-        if (!ret)
-                return TRACE_TYPE_PARTIAL_LINE;
-
-        switch (field->type) {
-        case HW_BREAKPOINT_R:
-                ret = trace_seq_printf(s, " R  ");
-                break;
-        case HW_BREAKPOINT_W:
-                ret = trace_seq_printf(s, " W  ");
-                break;
-        case HW_BREAKPOINT_R | HW_BREAKPOINT_W:
-                ret = trace_seq_printf(s, " RW ");
-                break;
-        default:
-                return TRACE_TYPE_PARTIAL_LINE;
-        }
-
-        if (!ret)
-                return TRACE_TYPE_PARTIAL_LINE;
-
-        sprint_symbol(str, field->ip);
-        ret = trace_seq_printf(s, "%s\n", str);
-        if (!ret)
-                return TRACE_TYPE_PARTIAL_LINE;
-
-        return TRACE_TYPE_HANDLED;
-}
-
-struct tracer ksym_tracer __read_mostly =
-{
-        .name           = "ksym_tracer",
-        .init           = ksym_trace_init,
-        .reset          = ksym_trace_reset,
-#ifdef CONFIG_FTRACE_SELFTEST
-        .selftest       = trace_selftest_startup_ksym,
-#endif
-        .print_header   = ksym_trace_print_header,
-        .print_line     = ksym_trace_output
-};
-
-#ifdef CONFIG_PROFILE_KSYM_TRACER
-static int ksym_profile_show(struct seq_file *m, void *v)
-{
-        struct hlist_node *node;
-        struct trace_ksym *entry;
-        int access_type = 0;
-        char fn_name[KSYM_NAME_LEN];
-
-        seq_puts(m, "  Access Type ");
-        seq_puts(m, "  Symbol                                       Counter\n");
-        seq_puts(m, "  ----------- ");
-        seq_puts(m, "  ------                                       -------\n");
-
-        rcu_read_lock();
-        hlist_for_each_entry_rcu(entry, node, &ksym_filter_head, ksym_hlist) {
-
-                access_type = entry->attr.bp_type;
-
-                switch (access_type) {
-                case HW_BREAKPOINT_R:
-                        seq_puts(m, "  R           ");
-                        break;
-                case HW_BREAKPOINT_W:
-                        seq_puts(m, "  W           ");
-                        break;
-                case HW_BREAKPOINT_R | HW_BREAKPOINT_W:
-                        seq_puts(m, "  RW          ");
-                        break;
-                default:
-                        seq_puts(m, "  NA          ");
-                }
-
-                if (lookup_symbol_name(entry->attr.bp_addr, fn_name) >= 0)
-                        seq_printf(m, "  %-36s", fn_name);
-                else
-                        seq_printf(m, "  %-36s", "<NA>");
-                seq_printf(m, " %15llu\n",
-                           (unsigned long long)atomic64_read(&entry->counter));
-        }
-        rcu_read_unlock();
-
-        return 0;
-}
-
-static int ksym_profile_open(struct inode *node, struct file *file)
-{
-        return single_open(file, ksym_profile_show, NULL);
-}
-
-static const struct file_operations ksym_profile_fops = {
-        .open           = ksym_profile_open,
-        .read           = seq_read,
-        .llseek         = seq_lseek,
-        .release        = single_release,
-};
-#endif /* CONFIG_PROFILE_KSYM_TRACER */
-
-__init static int init_ksym_trace(void)
-{
-        struct dentry *d_tracer;
-
-        d_tracer = tracing_init_dentry();
-
-        trace_create_file("ksym_trace_filter", 0644, d_tracer,
-                          NULL, &ksym_tracing_fops);
-
-#ifdef CONFIG_PROFILE_KSYM_TRACER
-        trace_create_file("ksym_profile", 0444, d_tracer,
-                          NULL, &ksym_profile_fops);
-#endif
-
-        return register_tracer(&ksym_tracer);
-}
-device_initcall(init_ksym_trace);
diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
index 57c1b4596470..02272baa2206 100644
--- a/kernel/trace/trace_output.c
+++ b/kernel/trace/trace_output.c
@@ -16,9 +16,6 @@
 
 DECLARE_RWSEM(trace_event_mutex);
 
-DEFINE_PER_CPU(struct trace_seq, ftrace_event_seq);
-EXPORT_PER_CPU_SYMBOL(ftrace_event_seq);
-
 static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
 
 static int next_event_type = __TRACE_LAST_TYPE + 1;
@@ -1069,65 +1066,6 @@ static struct trace_event trace_wake_event = {
         .funcs          = &trace_wake_funcs,
 };
 
-/* TRACE_SPECIAL */
-static enum print_line_t trace_special_print(struct trace_iterator *iter,
-                                             int flags, struct trace_event *event)
-{
-        struct special_entry *field;
-
-        trace_assign_type(field, iter->ent);
-
-        if (!trace_seq_printf(&iter->seq, "# %ld %ld %ld\n",
-                              field->arg1,
-                              field->arg2,
-                              field->arg3))
-                return TRACE_TYPE_PARTIAL_LINE;
-
-        return TRACE_TYPE_HANDLED;
-}
-
-static enum print_line_t trace_special_hex(struct trace_iterator *iter,
-                                           int flags, struct trace_event *event)
-{
-        struct special_entry *field;
-        struct trace_seq *s = &iter->seq;
-
-        trace_assign_type(field, iter->ent);
-
-        SEQ_PUT_HEX_FIELD_RET(s, field->arg1);
-        SEQ_PUT_HEX_FIELD_RET(s, field->arg2);
-        SEQ_PUT_HEX_FIELD_RET(s, field->arg3);
-
-        return TRACE_TYPE_HANDLED;
-}
-
-static enum print_line_t trace_special_bin(struct trace_iterator *iter,
-                                           int flags, struct trace_event *event)
-{
-        struct special_entry *field;
-        struct trace_seq *s = &iter->seq;
-
-        trace_assign_type(field, iter->ent);
-
-        SEQ_PUT_FIELD_RET(s, field->arg1);
-        SEQ_PUT_FIELD_RET(s, field->arg2);
-        SEQ_PUT_FIELD_RET(s, field->arg3);
-
-        return TRACE_TYPE_HANDLED;
-}
-
-static struct trace_event_functions trace_special_funcs = {
-        .trace          = trace_special_print,
-        .raw            = trace_special_print,
-        .hex            = trace_special_hex,
-        .binary         = trace_special_bin,
-};
-
-static struct trace_event trace_special_event = {
-        .type           = TRACE_SPECIAL,
-        .funcs          = &trace_special_funcs,
-};
-
 /* TRACE_STACK */
 
 static enum print_line_t trace_stack_print(struct trace_iterator *iter,
@@ -1161,9 +1099,6 @@ static enum print_line_t trace_stack_print(struct trace_iterator *iter,
 
 static struct trace_event_functions trace_stack_funcs = {
         .trace          = trace_stack_print,
-        .raw            = trace_special_print,
-        .hex            = trace_special_hex,
-        .binary         = trace_special_bin,
 };
 
 static struct trace_event trace_stack_event = {
@@ -1194,9 +1129,6 @@ static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
 
 static struct trace_event_functions trace_user_stack_funcs = {
         .trace          = trace_user_stack_print,
-        .raw            = trace_special_print,
-        .hex            = trace_special_hex,
-        .binary         = trace_special_bin,
 };
 
 static struct trace_event trace_user_stack_event = {
@@ -1314,7 +1246,6 @@ static struct trace_event *events[] __initdata = {
         &trace_fn_event,
         &trace_ctx_event,
         &trace_wake_event,
-        &trace_special_event,
         &trace_stack_event,
         &trace_user_stack_event,
         &trace_bprint_event,
diff --git a/kernel/trace/trace_sched_wakeup.c b/kernel/trace/trace_sched_wakeup.c
index 0e73bc2ef8c5..4086eae6e81b 100644
--- a/kernel/trace/trace_sched_wakeup.c
+++ b/kernel/trace/trace_sched_wakeup.c
@@ -46,7 +46,6 @@ wakeup_tracer_call(unsigned long ip, unsigned long parent_ip)
         struct trace_array_cpu *data;
         unsigned long flags;
         long disabled;
-        int resched;
         int cpu;
         int pc;
 
@@ -54,7 +53,7 @@ wakeup_tracer_call(unsigned long ip, unsigned long parent_ip)
                 return;
 
         pc = preempt_count();
-        resched = ftrace_preempt_disable();
+        preempt_disable_notrace();
 
         cpu = raw_smp_processor_id();
         if (cpu != wakeup_current_cpu)
@@ -74,7 +73,7 @@ wakeup_tracer_call(unsigned long ip, unsigned long parent_ip)
  out:
         atomic_dec(&data->disabled);
  out_enable:
-        ftrace_preempt_enable(resched);
+        preempt_enable_notrace();
 }
 
 static struct ftrace_ops trace_ops __read_mostly =
@@ -383,6 +382,7 @@ static struct tracer wakeup_tracer __read_mostly =
 #ifdef CONFIG_FTRACE_SELFTEST
         .selftest    = trace_selftest_startup_wakeup,
 #endif
+        .use_max_tr     = 1,
 };
 
 static struct tracer wakeup_rt_tracer __read_mostly =
@@ -397,6 +397,7 @@ static struct tracer wakeup_rt_tracer __read_mostly =
 #ifdef CONFIG_FTRACE_SELFTEST
         .selftest    = trace_selftest_startup_wakeup,
 #endif
+        .use_max_tr     = 1,
 };
 
 __init static int init_wakeup_tracer(void)
diff --git a/kernel/trace/trace_selftest.c b/kernel/trace/trace_selftest.c
index 250e7f9bd2f0..155a415b3209 100644
--- a/kernel/trace/trace_selftest.c
+++ b/kernel/trace/trace_selftest.c
@@ -13,11 +13,9 @@ static inline int trace_valid_entry(struct trace_entry *entry)
         case TRACE_WAKE:
         case TRACE_STACK:
         case TRACE_PRINT:
-        case TRACE_SPECIAL:
         case TRACE_BRANCH:
         case TRACE_GRAPH_ENT:
         case TRACE_GRAPH_RET:
-        case TRACE_KSYM:
                 return 1;
         }
         return 0;
@@ -691,38 +689,6 @@ trace_selftest_startup_sched_switch(struct tracer *trace, struct trace_array *tr
 }
 #endif /* CONFIG_CONTEXT_SWITCH_TRACER */
 
-#ifdef CONFIG_SYSPROF_TRACER
-int
-trace_selftest_startup_sysprof(struct tracer *trace, struct trace_array *tr)
-{
-        unsigned long count;
-        int ret;
-
-        /* start the tracing */
-        ret = tracer_init(trace, tr);
-        if (ret) {
-                warn_failed_init_tracer(trace, ret);
-                return ret;
-        }
-
-        /* Sleep for a 1/10 of a second */
-        msleep(100);
-        /* stop the tracing. */
-        tracing_stop();
-        /* check the trace buffer */
-        ret = trace_test_buffer(tr, &count);
-        trace->reset(tr);
-        tracing_start();
-
-        if (!ret && !count) {
-                printk(KERN_CONT ".. no entries found ..");
-                ret = -1;
-        }
-
-        return ret;
-}
-#endif /* CONFIG_SYSPROF_TRACER */
-
 #ifdef CONFIG_BRANCH_TRACER
 int
 trace_selftest_startup_branch(struct tracer *trace, struct trace_array *tr)
@@ -755,56 +721,3 @@ trace_selftest_startup_branch(struct tracer *trace, struct trace_array *tr)
 }
 #endif /* CONFIG_BRANCH_TRACER */
 
-#ifdef CONFIG_KSYM_TRACER
-static int ksym_selftest_dummy;
-
-int
-trace_selftest_startup_ksym(struct tracer *trace, struct trace_array *tr)
-{
-        unsigned long count;
-        int ret;
-
-        /* start the tracing */
-        ret = tracer_init(trace, tr);
-        if (ret) {
-                warn_failed_init_tracer(trace, ret);
-                return ret;
-        }
-
-        ksym_selftest_dummy = 0;
-        /* Register the read-write tracing request */
-
-        ret = process_new_ksym_entry("ksym_selftest_dummy",
-                                     HW_BREAKPOINT_R | HW_BREAKPOINT_W,
-                                        (unsigned long)(&ksym_selftest_dummy));
-
-        if (ret < 0) {
-                printk(KERN_CONT "ksym_trace read-write startup test failed\n");
-                goto ret_path;
-        }
-        /* Perform a read and a write operation over the dummy variable to
-         * trigger the tracer
-         */
-        if (ksym_selftest_dummy == 0)
-                ksym_selftest_dummy++;
-
-        /* stop the tracing. */
-        tracing_stop();
-        /* check the trace buffer */
-        ret = trace_test_buffer(tr, &count);
-        trace->reset(tr);
-        tracing_start();
-
-        /* read & write operations - one each is performed on the dummy variable
-         * triggering two entries in the trace buffer
-         */
-        if (!ret && count != 2) {
-                printk(KERN_CONT "Ksym tracer startup test failed");
-                ret = -1;
-        }
-
-ret_path:
-        return ret;
-}
-#endif /* CONFIG_KSYM_TRACER */
-
diff --git a/kernel/trace/trace_stack.c b/kernel/trace/trace_stack.c
index f4bc9b27de5f..a6b7e0e0f3eb 100644
--- a/kernel/trace/trace_stack.c
+++ b/kernel/trace/trace_stack.c
@@ -110,12 +110,12 @@ static inline void check_stack(void)
 static void
 stack_trace_call(unsigned long ip, unsigned long parent_ip)
 {
-        int cpu, resched;
+        int cpu;
 
         if (unlikely(!ftrace_enabled || stack_trace_disabled))
                 return;
 
-        resched = ftrace_preempt_disable();
+        preempt_disable_notrace();
 
         cpu = raw_smp_processor_id();
         /* no atomic needed, we only modify this variable by this cpu */
@@ -127,7 +127,7 @@ stack_trace_call(unsigned long ip, unsigned long parent_ip)
  out:
         per_cpu(trace_active, cpu)--;
         /* prevent recursion in schedule */
-        ftrace_preempt_enable(resched);
+        preempt_enable_notrace();
 }
 
 static struct ftrace_ops trace_ops __read_mostly =
@@ -249,7 +249,7 @@ static int trace_lookup_stack(struct seq_file *m, long i)
 {
         unsigned long addr = stack_dump_trace[i];
 
-        return seq_printf(m, "%pF\n", (void *)addr);
+        return seq_printf(m, "%pS\n", (void *)addr);
 }
 
 static void print_disabled(struct seq_file *m)
diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
index 34e35804304b..bac752f0cfb5 100644
--- a/kernel/trace/trace_syscalls.c
+++ b/kernel/trace/trace_syscalls.c
@@ -23,6 +23,9 @@ static int syscall_exit_register(struct ftrace_event_call *event,
 static int syscall_enter_define_fields(struct ftrace_event_call *call);
 static int syscall_exit_define_fields(struct ftrace_event_call *call);
 
+/* All syscall exit events have the same fields */
+static LIST_HEAD(syscall_exit_fields);
+
 static struct list_head *
 syscall_get_enter_fields(struct ftrace_event_call *call)
 {
@@ -34,9 +37,7 @@ syscall_get_enter_fields(struct ftrace_event_call *call)
 static struct list_head *
 syscall_get_exit_fields(struct ftrace_event_call *call)
 {
-        struct syscall_metadata *entry = call->data;
-
-        return &entry->exit_fields;
+        return &syscall_exit_fields;
 }
 
 struct trace_event_functions enter_syscall_print_funcs = {
diff --git a/kernel/trace/trace_sysprof.c b/kernel/trace/trace_sysprof.c
deleted file mode 100644
index a7974a552ca9..000000000000
--- a/kernel/trace/trace_sysprof.c
+++ /dev/null
@@ -1,329 +0,0 @@
-/*
- * trace stack traces
- *
- * Copyright (C) 2004-2008, Soeren Sandmann
- * Copyright (C) 2007 Steven Rostedt <srostedt@redhat.com>
- * Copyright (C) 2008 Ingo Molnar <mingo@redhat.com>
- */
-#include <linux/kallsyms.h>
-#include <linux/debugfs.h>
-#include <linux/hrtimer.h>
-#include <linux/uaccess.h>
-#include <linux/ftrace.h>
-#include <linux/module.h>
-#include <linux/irq.h>
-#include <linux/fs.h>
-
-#include <asm/stacktrace.h>
-
-#include "trace.h"
-
-static struct trace_array       *sysprof_trace;
-static int __read_mostly        tracer_enabled;
-
-/*
- * 1 msec sample interval by default:
- */
-static unsigned long sample_period = 1000000;
-static const unsigned int sample_max_depth = 512;
-
-static DEFINE_MUTEX(sample_timer_lock);
-/*
- * Per CPU hrtimers that do the profiling:
- */
-static DEFINE_PER_CPU(struct hrtimer, stack_trace_hrtimer);
-
-struct stack_frame {
-        const void __user       *next_fp;
-        unsigned long           return_address;
-};
-
-static int copy_stack_frame(const void __user *fp, struct stack_frame *frame)
-{
-        int ret;
-
-        if (!access_ok(VERIFY_READ, fp, sizeof(*frame)))
-                return 0;
-
-        ret = 1;
-        pagefault_disable();
-        if (__copy_from_user_inatomic(frame, fp, sizeof(*frame)))
-                ret = 0;
-        pagefault_enable();
-
-        return ret;
-}
-
-struct backtrace_info {
-        struct trace_array_cpu  *data;
-        struct trace_array      *tr;
-        int                     pos;
-};
-
-static void
-backtrace_warning_symbol(void *data, char *msg, unsigned long symbol)
-{
-        /* Ignore warnings */
-}
-
-static void backtrace_warning(void *data, char *msg)
-{
-        /* Ignore warnings */
-}
-
-static int backtrace_stack(void *data, char *name)
-{
-        /* Don't bother with IRQ stacks for now */
-        return -1;
-}
-
-static void backtrace_address(void *data, unsigned long addr, int reliable)
-{
-        struct backtrace_info *info = data;
-
-        if (info->pos < sample_max_depth && reliable) {
-                __trace_special(info->tr, info->data, 1, addr, 0);
-
-                info->pos++;
-        }
-}
-
-static const struct stacktrace_ops backtrace_ops = {
-        .warning                = backtrace_warning,
-        .warning_symbol         = backtrace_warning_symbol,
-        .stack                  = backtrace_stack,
-        .address                = backtrace_address,
-        .walk_stack             = print_context_stack,
-};
-
-static int
-trace_kernel(struct pt_regs *regs, struct trace_array *tr,
-             struct trace_array_cpu *data)
-{
-        struct backtrace_info info;
-        unsigned long bp;
-        char *stack;
-
-        info.tr = tr;
-        info.data = data;
-        info.pos = 1;
-
-        __trace_special(info.tr, info.data, 1, regs->ip, 0);
-
-        stack = ((char *)regs + sizeof(struct pt_regs));
-#ifdef CONFIG_FRAME_POINTER
-        bp = regs->bp;
-#else
-        bp = 0;
-#endif
-
-        dump_trace(NULL, regs, (void *)stack, bp, &backtrace_ops, &info);
-
-        return info.pos;
-}
-
-static void timer_notify(struct pt_regs *regs, int cpu)
-{
-        struct trace_array_cpu *data;
-        struct stack_frame frame;
-        struct trace_array *tr;
-        const void __user *fp;
-        int is_user;
-        int i;
-
-        if (!regs)
-                return;
-
-        tr = sysprof_trace;
-        data = tr->data[cpu];
-        is_user = user_mode(regs);
-
-        if (!current || current->pid == 0)
-                return;
-
-        if (is_user && current->state != TASK_RUNNING)
-                return;
-
-        __trace_special(tr, data, 0, 0, current->pid);
-
-        if (!is_user)
-                i = trace_kernel(regs, tr, data);
-        else
-                i = 0;
-
-        /*
-         * Trace user stack if we are not a kernel thread
-         */
-        if (current->mm && i < sample_max_depth) {
-                regs = (struct pt_regs *)current->thread.sp0 - 1;
-
-                fp = (void __user *)regs->bp;
-
-                __trace_special(tr, data, 2, regs->ip, 0);
-
-                while (i < sample_max_depth) {
-                        frame.next_fp = NULL;
-                        frame.return_address = 0;
-                        if (!copy_stack_frame(fp, &frame))
-                                break;
-                        if ((unsigned long)fp < regs->sp)
-                                break;
-
-                        __trace_special(tr, data, 2, frame.return_address,
-                                        (unsigned long)fp);
-                        fp = frame.next_fp;
-
-                        i++;
-                }
-
-        }
-
-        /*
-         * Special trace entry if we overflow the max depth:
-         */
-        if (i == sample_max_depth)
-                __trace_special(tr, data, -1, -1, -1);
-
-        __trace_special(tr, data, 3, current->pid, i);
-}
-
-static enum hrtimer_restart stack_trace_timer_fn(struct hrtimer *hrtimer)
-{
-        /* trace here */
-        timer_notify(get_irq_regs(), smp_processor_id());
-
-        hrtimer_forward_now(hrtimer, ns_to_ktime(sample_period));
-
-        return HRTIMER_RESTART;
-}
-
-static void start_stack_timer(void *unused)
-{
-        struct hrtimer *hrtimer = &__get_cpu_var(stack_trace_hrtimer);
-
-        hrtimer_init(hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
-        hrtimer->function = stack_trace_timer_fn;
-
-        hrtimer_start(hrtimer, ns_to_ktime(sample_period),
-                      HRTIMER_MODE_REL_PINNED);
-}
-
-static void start_stack_timers(void)
-{
-        on_each_cpu(start_stack_timer, NULL, 1);
-}
-
-static void stop_stack_timer(int cpu)
-{
-        struct hrtimer *hrtimer = &per_cpu(stack_trace_hrtimer, cpu);
-
-        hrtimer_cancel(hrtimer);
-}
-
-static void stop_stack_timers(void)
-{
-        int cpu;
-
-        for_each_online_cpu(cpu)
-                stop_stack_timer(cpu);
-}
-
-static void stop_stack_trace(struct trace_array *tr)
-{
-        mutex_lock(&sample_timer_lock);
-        stop_stack_timers();
-        tracer_enabled = 0;
-        mutex_unlock(&sample_timer_lock);
-}
-
-static int stack_trace_init(struct trace_array *tr)
-{
-        sysprof_trace = tr;
-
-        tracing_start_cmdline_record();
-
-        mutex_lock(&sample_timer_lock);
-        start_stack_timers();
-        tracer_enabled = 1;
-        mutex_unlock(&sample_timer_lock);
-        return 0;
-}
-
-static void stack_trace_reset(struct trace_array *tr)
-{
-        tracing_stop_cmdline_record();
-        stop_stack_trace(tr);
-}
-
-static struct tracer stack_trace __read_mostly =
-{
-        .name           = "sysprof",
-        .init           = stack_trace_init,
-        .reset          = stack_trace_reset,
-#ifdef CONFIG_FTRACE_SELFTEST
-        .selftest    = trace_selftest_startup_sysprof,
-#endif
-};
-
-__init static int init_stack_trace(void)
-{
-        return register_tracer(&stack_trace);
-}
-device_initcall(init_stack_trace);
-
-#define MAX_LONG_DIGITS 22
-
-static ssize_t
-sysprof_sample_read(struct file *filp, char __user *ubuf,
-                    size_t cnt, loff_t *ppos)
-{
-        char buf[MAX_LONG_DIGITS];
-        int r;
-
-        r = sprintf(buf, "%ld\n", nsecs_to_usecs(sample_period));
-
-        return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
-}
-
-static ssize_t
-sysprof_sample_write(struct file *filp, const char __user *ubuf,
-                     size_t cnt, loff_t *ppos)
-{
-        char buf[MAX_LONG_DIGITS];
-        unsigned long val;
-
-        if (cnt > MAX_LONG_DIGITS-1)
-                cnt = MAX_LONG_DIGITS-1;
-
-        if (copy_from_user(&buf, ubuf, cnt))
-                return -EFAULT;
-
-        buf[cnt] = 0;
-
-        val = simple_strtoul(buf, NULL, 10);
-        /*
-         * Enforce a minimum sample period of 100 usecs:
-         */
-        if (val < 100)
-                val = 100;
-
-        mutex_lock(&sample_timer_lock);
-        stop_stack_timers();
-        sample_period = val * 1000;
-        start_stack_timers();
-        mutex_unlock(&sample_timer_lock);
-
-        return cnt;
-}
-
-static const struct file_operations sysprof_sample_fops = {
-        .read           = sysprof_sample_read,
-        .write          = sysprof_sample_write,
-};
-
-void init_tracer_sysprof_debugfs(struct dentry *d_tracer)
-{
-
-        trace_create_file("sysprof_sample_period", 0644,
-                        d_tracer, NULL, &sysprof_sample_fops);
-}
diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c
index b2d70d38dff4..25915832291a 100644
--- a/kernel/user_namespace.c
+++ b/kernel/user_namespace.c
@@ -9,6 +9,7 @@
 #include <linux/nsproxy.h>
 #include <linux/slab.h>
 #include <linux/user_namespace.h>
+#include <linux/highuid.h>
 #include <linux/cred.h>
 
 /*
@@ -82,3 +83,46 @@ void free_user_ns(struct kref *kref)
         schedule_work(&ns->destroyer);
 }
 EXPORT_SYMBOL(free_user_ns);
+
+uid_t user_ns_map_uid(struct user_namespace *to, const struct cred *cred, uid_t uid)
+{
+        struct user_namespace *tmp;
+
+        if (likely(to == cred->user->user_ns))
+                return uid;
+
+
+        /* Is cred->user the creator of the target user_ns
+         * or the creator of one of it's parents?
+         */
+        for ( tmp = to; tmp != &init_user_ns;
+              tmp = tmp->creator->user_ns ) {
+                if (cred->user == tmp->creator) {
+                        return (uid_t)0;
+                }
+        }
+
+        /* No useful relationship so no mapping */
+        return overflowuid;
+}
+
+gid_t user_ns_map_gid(struct user_namespace *to, const struct cred *cred, gid_t gid)
+{
+        struct user_namespace *tmp;
+
+        if (likely(to == cred->user->user_ns))
+                return gid;
+
+        /* Is cred->user the creator of the target user_ns
+         * or the creator of one of it's parents?
+         */
+        for ( tmp = to; tmp != &init_user_ns;
+              tmp = tmp->creator->user_ns ) {
+                if (cred->user == tmp->creator) {
+                        return (gid_t)0;
+                }
+        }
+
+        /* No useful relationship so no mapping */
+        return overflowgid;
+}
diff --git a/kernel/watchdog.c b/kernel/watchdog.c
new file mode 100644
index 000000000000..0d53c8e853b1
--- /dev/null
+++ b/kernel/watchdog.c
@@ -0,0 +1,570 @@
+/*
+ * Detect hard and soft lockups on a system
+ *
+ * started by Don Zickus, Copyright (C) 2010 Red Hat, Inc.
+ *
+ * this code detects hard lockups: incidents in where on a CPU
+ * the kernel does not respond to anything except NMI.
+ *
+ * Note: Most of this code is borrowed heavily from softlockup.c,
+ * so thanks to Ingo for the initial implementation.
+ * Some chunks also taken from arch/x86/kernel/apic/nmi.c, thanks
+ * to those contributors as well.
+ */
+
+#include <linux/mm.h>
+#include <linux/cpu.h>
+#include <linux/nmi.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/freezer.h>
+#include <linux/kthread.h>
+#include <linux/lockdep.h>
+#include <linux/notifier.h>
+#include <linux/module.h>
+#include <linux/sysctl.h>
+
+#include <asm/irq_regs.h>
+#include <linux/perf_event.h>
+
+int watchdog_enabled;
+int __read_mostly softlockup_thresh = 60;
+
+static DEFINE_PER_CPU(unsigned long, watchdog_touch_ts);
+static DEFINE_PER_CPU(struct task_struct *, softlockup_watchdog);
+static DEFINE_PER_CPU(struct hrtimer, watchdog_hrtimer);
+static DEFINE_PER_CPU(bool, softlockup_touch_sync);
+static DEFINE_PER_CPU(bool, soft_watchdog_warn);
+#ifdef CONFIG_HARDLOCKUP_DETECTOR
+static DEFINE_PER_CPU(bool, hard_watchdog_warn);
+static DEFINE_PER_CPU(bool, watchdog_nmi_touch);
+static DEFINE_PER_CPU(unsigned long, hrtimer_interrupts);
+static DEFINE_PER_CPU(unsigned long, hrtimer_interrupts_saved);
+static DEFINE_PER_CPU(struct perf_event *, watchdog_ev);
+#endif
+
+static int __read_mostly did_panic;
+static int __initdata no_watchdog;
+
+
+/* boot commands */
+/*
+ * Should we panic when a soft-lockup or hard-lockup occurs:
+ */
+#ifdef CONFIG_HARDLOCKUP_DETECTOR
+static int hardlockup_panic;
+
+static int __init hardlockup_panic_setup(char *str)
+{
+        if (!strncmp(str, "panic", 5))
+                hardlockup_panic = 1;
+        return 1;
+}
+__setup("nmi_watchdog=", hardlockup_panic_setup);
+#endif
+
+unsigned int __read_mostly softlockup_panic =
+                        CONFIG_BOOTPARAM_SOFTLOCKUP_PANIC_VALUE;
+
+static int __init softlockup_panic_setup(char *str)
+{
+        softlockup_panic = simple_strtoul(str, NULL, 0);
+
+        return 1;
+}
+__setup("softlockup_panic=", softlockup_panic_setup);
+
+static int __init nowatchdog_setup(char *str)
+{
+        no_watchdog = 1;
+        return 1;
+}
+__setup("nowatchdog", nowatchdog_setup);
+
+/* deprecated */
+static int __init nosoftlockup_setup(char *str)
+{
+        no_watchdog = 1;
+        return 1;
+}
+__setup("nosoftlockup", nosoftlockup_setup);
+/*  */
+
+
+/*
+ * Returns seconds, approximately.  We don't need nanosecond
+ * resolution, and we don't need to waste time with a big divide when
+ * 2^30ns == 1.074s.
+ */
+static unsigned long get_timestamp(int this_cpu)
+{
+        return cpu_clock(this_cpu) >> 30LL;  /* 2^30 ~= 10^9 */
+}
+
+static unsigned long get_sample_period(void)
+{
+        /*
+         * convert softlockup_thresh from seconds to ns
+         * the divide by 5 is to give hrtimer 5 chances to
+         * increment before the hardlockup detector generates
+         * a warning
+         */
+        return softlockup_thresh / 5 * NSEC_PER_SEC;
+}
+
+/* Commands for resetting the watchdog */
+static void __touch_watchdog(void)
+{
+        int this_cpu = smp_processor_id();
+
+        __get_cpu_var(watchdog_touch_ts) = get_timestamp(this_cpu);
+}
+
+void touch_softlockup_watchdog(void)
+{
+        __get_cpu_var(watchdog_touch_ts) = 0;
+}
+EXPORT_SYMBOL(touch_softlockup_watchdog);
+
+void touch_all_softlockup_watchdogs(void)
+{
+        int cpu;
+
+        /*
+         * this is done lockless
+         * do we care if a 0 races with a timestamp?
+         * all it means is the softlock check starts one cycle later
+         */
+        for_each_online_cpu(cpu)
+                per_cpu(watchdog_touch_ts, cpu) = 0;
+}
+
+#ifdef CONFIG_HARDLOCKUP_DETECTOR
+void touch_nmi_watchdog(void)
+{
+        __get_cpu_var(watchdog_nmi_touch) = true;
+        touch_softlockup_watchdog();
+}
+EXPORT_SYMBOL(touch_nmi_watchdog);
+
+#endif
+
+void touch_softlockup_watchdog_sync(void)
+{
+        __raw_get_cpu_var(softlockup_touch_sync) = true;
+        __raw_get_cpu_var(watchdog_touch_ts) = 0;
+}
+
+#ifdef CONFIG_HARDLOCKUP_DETECTOR
+/* watchdog detector functions */
+static int is_hardlockup(void)
+{
+        unsigned long hrint = __get_cpu_var(hrtimer_interrupts);
+
+        if (__get_cpu_var(hrtimer_interrupts_saved) == hrint)
+                return 1;
+
+        __get_cpu_var(hrtimer_interrupts_saved) = hrint;
+        return 0;
+}
+#endif
+
+static int is_softlockup(unsigned long touch_ts)
+{
+        unsigned long now = get_timestamp(smp_processor_id());
+
+        /* Warn about unreasonable delays: */
+        if (time_after(now, touch_ts + softlockup_thresh))
+                return now - touch_ts;
+
+        return 0;
+}
+
+static int
+watchdog_panic(struct notifier_block *this, unsigned long event, void *ptr)
+{
+        did_panic = 1;
+
+        return NOTIFY_DONE;
+}
+
+static struct notifier_block panic_block = {
+        .notifier_call = watchdog_panic,
+};
+
+#ifdef CONFIG_HARDLOCKUP_DETECTOR
+static struct perf_event_attr wd_hw_attr = {
+        .type           = PERF_TYPE_HARDWARE,
+        .config         = PERF_COUNT_HW_CPU_CYCLES,
+        .size           = sizeof(struct perf_event_attr),
+        .pinned         = 1,
+        .disabled       = 1,
+};
+
+/* Callback function for perf event subsystem */
+void watchdog_overflow_callback(struct perf_event *event, int nmi,
+                 struct perf_sample_data *data,
+                 struct pt_regs *regs)
+{
+        /* Ensure the watchdog never gets throttled */
+        event->hw.interrupts = 0;
+
+        if (__get_cpu_var(watchdog_nmi_touch) == true) {
+                __get_cpu_var(watchdog_nmi_touch) = false;
+                return;
+        }
+
+        /* check for a hardlockup
+         * This is done by making sure our timer interrupt
+         * is incrementing.  The timer interrupt should have
+         * fired multiple times before we overflow'd.  If it hasn't
+         * then this is a good indication the cpu is stuck
+         */
+        if (is_hardlockup()) {
+                int this_cpu = smp_processor_id();
+
+                /* only print hardlockups once */
+                if (__get_cpu_var(hard_watchdog_warn) == true)
+                        return;
+
+                if (hardlockup_panic)
+                        panic("Watchdog detected hard LOCKUP on cpu %d", this_cpu);
+                else
+                        WARN(1, "Watchdog detected hard LOCKUP on cpu %d", this_cpu);
+
+                __get_cpu_var(hard_watchdog_warn) = true;
+                return;
+        }
+
+        __get_cpu_var(hard_watchdog_warn) = false;
+        return;
+}
+static void watchdog_interrupt_count(void)
+{
+        __get_cpu_var(hrtimer_interrupts)++;
+}
+#else
+static inline void watchdog_interrupt_count(void) { return; }
+#endif /* CONFIG_HARDLOCKUP_DETECTOR */
+
+/* watchdog kicker functions */
+static enum hrtimer_restart watchdog_timer_fn(struct hrtimer *hrtimer)
+{
+        unsigned long touch_ts = __get_cpu_var(watchdog_touch_ts);
+        struct pt_regs *regs = get_irq_regs();
+        int duration;
+
+        /* kick the hardlockup detector */
+        watchdog_interrupt_count();
+
+        /* kick the softlockup detector */
+        wake_up_process(__get_cpu_var(softlockup_watchdog));
+
+        /* .. and repeat */
+        hrtimer_forward_now(hrtimer, ns_to_ktime(get_sample_period()));
+
+        if (touch_ts == 0) {
+                if (unlikely(__get_cpu_var(softlockup_touch_sync))) {
+                        /*
+                         * If the time stamp was touched atomically
+                         * make sure the scheduler tick is up to date.
+                         */
+                        __get_cpu_var(softlockup_touch_sync) = false;
+                        sched_clock_tick();
+                }
+                __touch_watchdog();
+                return HRTIMER_RESTART;
+        }
+
+        /* check for a softlockup
+         * This is done by making sure a high priority task is
+         * being scheduled.  The task touches the watchdog to
+         * indicate it is getting cpu time.  If it hasn't then
+         * this is a good indication some task is hogging the cpu
+         */
+        duration = is_softlockup(touch_ts);
+        if (unlikely(duration)) {
+                /* only warn once */
+                if (__get_cpu_var(soft_watchdog_warn) == true)
+                        return HRTIMER_RESTART;
+
+                printk(KERN_ERR "BUG: soft lockup - CPU#%d stuck for %us! [%s:%d]\n",
+                        smp_processor_id(), duration,
+                        current->comm, task_pid_nr(current));
+                print_modules();
+                print_irqtrace_events(current);
+                if (regs)
+                        show_regs(regs);
+                else
+                        dump_stack();
+
+                if (softlockup_panic)
+                        panic("softlockup: hung tasks");
+                __get_cpu_var(soft_watchdog_warn) = true;
+        } else
+                __get_cpu_var(soft_watchdog_warn) = false;
+
+        return HRTIMER_RESTART;
+}
+
+
+/*
+ * The watchdog thread - touches the timestamp.
+ */
+static int watchdog(void *unused)
+{
+        struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 };
+        struct hrtimer *hrtimer = &__raw_get_cpu_var(watchdog_hrtimer);
+
+        sched_setscheduler(current, SCHED_FIFO, &param);
+
+        /* initialize timestamp */
+        __touch_watchdog();
+
+        /* kick off the timer for the hardlockup detector */
+        /* done here because hrtimer_start can only pin to smp_processor_id() */
+        hrtimer_start(hrtimer, ns_to_ktime(get_sample_period()),
+                      HRTIMER_MODE_REL_PINNED);
+
+        set_current_state(TASK_INTERRUPTIBLE);
+        /*
+         * Run briefly once per second to reset the softlockup timestamp.
+         * If this gets delayed for more than 60 seconds then the
+         * debug-printout triggers in watchdog_timer_fn().
+         */
+        while (!kthread_should_stop()) {
+                __touch_watchdog();
+                schedule();
+
+                if (kthread_should_stop())
+                        break;
+
+                set_current_state(TASK_INTERRUPTIBLE);
+        }
+        __set_current_state(TASK_RUNNING);
+
+        return 0;
+}
+
+
+#ifdef CONFIG_HARDLOCKUP_DETECTOR
+static int watchdog_nmi_enable(int cpu)
+{
+        struct perf_event_attr *wd_attr;
+        struct perf_event *event = per_cpu(watchdog_ev, cpu);
+
+        /* is it already setup and enabled? */
+        if (event && event->state > PERF_EVENT_STATE_OFF)
+                goto out;
+
+        /* it is setup but not enabled */
+        if (event != NULL)
+                goto out_enable;
+
+        /* Try to register using hardware perf events */
+        wd_attr = &wd_hw_attr;
+        wd_attr->sample_period = hw_nmi_get_sample_period();
+        event = perf_event_create_kernel_counter(wd_attr, cpu, -1, watchdog_overflow_callback);
+        if (!IS_ERR(event)) {
+                printk(KERN_INFO "NMI watchdog enabled, takes one hw-pmu counter.\n");
+                goto out_save;
+        }
+
+        printk(KERN_ERR "NMI watchdog failed to create perf event on cpu%i: %p\n", cpu, event);
+        return -1;
+
+        /* success path */
+out_save:
+        per_cpu(watchdog_ev, cpu) = event;
+out_enable:
+        perf_event_enable(per_cpu(watchdog_ev, cpu));
+out:
+        return 0;
+}
+
+static void watchdog_nmi_disable(int cpu)
+{
+        struct perf_event *event = per_cpu(watchdog_ev, cpu);
+
+        if (event) {
+                perf_event_disable(event);
+                per_cpu(watchdog_ev, cpu) = NULL;
+
+                /* should be in cleanup, but blocks oprofile */
+                perf_event_release_kernel(event);
+        }
+        return;
+}
+#else
+static int watchdog_nmi_enable(int cpu) { return 0; }
+static void watchdog_nmi_disable(int cpu) { return; }
+#endif /* CONFIG_HARDLOCKUP_DETECTOR */
+
+/* prepare/enable/disable routines */
+static int watchdog_prepare_cpu(int cpu)
+{
+        struct hrtimer *hrtimer = &per_cpu(watchdog_hrtimer, cpu);
+
+        WARN_ON(per_cpu(softlockup_watchdog, cpu));
+        hrtimer_init(hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+        hrtimer->function = watchdog_timer_fn;
+
+        return 0;
+}
+
+static int watchdog_enable(int cpu)
+{
+        struct task_struct *p = per_cpu(softlockup_watchdog, cpu);
+
+        /* enable the perf event */
+        if (watchdog_nmi_enable(cpu) != 0)
+                return -1;
+
+        /* create the watchdog thread */
+        if (!p) {
+                p = kthread_create(watchdog, (void *)(unsigned long)cpu, "watchdog/%d", cpu);
+                if (IS_ERR(p)) {
+                        printk(KERN_ERR "softlockup watchdog for %i failed\n", cpu);
+                        return -1;
+                }
+                kthread_bind(p, cpu);
+                per_cpu(watchdog_touch_ts, cpu) = 0;
+                per_cpu(softlockup_watchdog, cpu) = p;
+                wake_up_process(p);
+        }
+
+        return 0;
+}
+
+static void watchdog_disable(int cpu)
+{
+        struct task_struct *p = per_cpu(softlockup_watchdog, cpu);
+        struct hrtimer *hrtimer = &per_cpu(watchdog_hrtimer, cpu);
+
+        /*
+         * cancel the timer first to stop incrementing the stats
+         * and waking up the kthread
+         */
+        hrtimer_cancel(hrtimer);
+
+        /* disable the perf event */
+        watchdog_nmi_disable(cpu);
+
+        /* stop the watchdog thread */
+        if (p) {
+                per_cpu(softlockup_watchdog, cpu) = NULL;
+                kthread_stop(p);
+        }
+
+        /* if any cpu succeeds, watchdog is considered enabled for the system */
+        watchdog_enabled = 1;
+}
+
+static void watchdog_enable_all_cpus(void)
+{
+        int cpu;
+        int result = 0;
+
+        for_each_online_cpu(cpu)
+                result += watchdog_enable(cpu);
+
+        if (result)
+                printk(KERN_ERR "watchdog: failed to be enabled on some cpus\n");
+
+}
+
+static void watchdog_disable_all_cpus(void)
+{
+        int cpu;
+
+        for_each_online_cpu(cpu)
+                watchdog_disable(cpu);
+
+        /* if all watchdogs are disabled, then they are disabled for the system */
+        watchdog_enabled = 0;
+}
+
+
+/* sysctl functions */
+#ifdef CONFIG_SYSCTL
+/*
+ * proc handler for /proc/sys/kernel/nmi_watchdog
+ */
+
+int proc_dowatchdog_enabled(struct ctl_table *table, int write,
+                     void __user *buffer, size_t *length, loff_t *ppos)
+{
+        proc_dointvec(table, write, buffer, length, ppos);
+
+        if (watchdog_enabled)
+                watchdog_enable_all_cpus();
+        else
+                watchdog_disable_all_cpus();
+        return 0;
+}
+
+int proc_dowatchdog_thresh(struct ctl_table *table, int write,
+                             void __user *buffer,
+                             size_t *lenp, loff_t *ppos)
+{
+        return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
+}
+#endif /* CONFIG_SYSCTL */
+
+
+/*
+ * Create/destroy watchdog threads as CPUs come and go:
+ */
+static int __cpuinit
+cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu)
+{
+        int hotcpu = (unsigned long)hcpu;
+
+        switch (action) {
+        case CPU_UP_PREPARE:
+        case CPU_UP_PREPARE_FROZEN:
+                if (watchdog_prepare_cpu(hotcpu))
+                        return NOTIFY_BAD;
+                break;
+        case CPU_ONLINE:
+        case CPU_ONLINE_FROZEN:
+                if (watchdog_enable(hotcpu))
+                        return NOTIFY_BAD;
+                break;
+#ifdef CONFIG_HOTPLUG_CPU
+        case CPU_UP_CANCELED:
+        case CPU_UP_CANCELED_FROZEN:
+                watchdog_disable(hotcpu);
+                break;
+        case CPU_DEAD:
+        case CPU_DEAD_FROZEN:
+                watchdog_disable(hotcpu);
+                break;
+#endif /* CONFIG_HOTPLUG_CPU */
+        }
+        return NOTIFY_OK;
+}
+
+static struct notifier_block __cpuinitdata cpu_nfb = {
+        .notifier_call = cpu_callback
+};
+
+static int __init spawn_watchdog_task(void)
+{
+        void *cpu = (void *)(long)smp_processor_id();
+        int err;
+
+        if (no_watchdog)
+                return 0;
+
+        err = cpu_callback(&cpu_nfb, CPU_UP_PREPARE, cpu);
+        WARN_ON(err == NOTIFY_BAD);
+
+        cpu_callback(&cpu_nfb, CPU_ONLINE, cpu);
+        register_cpu_notifier(&cpu_nfb);
+
+        atomic_notifier_chain_register(&panic_notifier_list, &panic_block);
+
+        return 0;
+}
+early_initcall(spawn_watchdog_task);
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 327d2deb4451..8bd600c020e5 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -33,41 +33,290 @@
 #include <linux/kallsyms.h>
 #include <linux/debug_locks.h>
 #include <linux/lockdep.h>
+#include <linux/idr.h>
+
 #define CREATE_TRACE_POINTS
 #include <trace/events/workqueue.h>
 
+#include "workqueue_sched.h"
+
+enum {
+        /* global_cwq flags */
+        GCWQ_MANAGE_WORKERS     = 1 << 0,       /* need to manage workers */
+        GCWQ_MANAGING_WORKERS   = 1 << 1,       /* managing workers */
+        GCWQ_DISASSOCIATED      = 1 << 2,       /* cpu can't serve workers */
+        GCWQ_FREEZING           = 1 << 3,       /* freeze in progress */
+        GCWQ_HIGHPRI_PENDING    = 1 << 4,       /* highpri works on queue */
+
+        /* worker flags */
+        WORKER_STARTED          = 1 << 0,       /* started */
+        WORKER_DIE              = 1 << 1,       /* die die die */
+        WORKER_IDLE             = 1 << 2,       /* is idle */
+        WORKER_PREP             = 1 << 3,       /* preparing to run works */
+        WORKER_ROGUE            = 1 << 4,       /* not bound to any cpu */
+        WORKER_REBIND           = 1 << 5,       /* mom is home, come back */
+        WORKER_CPU_INTENSIVE    = 1 << 6,       /* cpu intensive */
+        WORKER_UNBOUND          = 1 << 7,       /* worker is unbound */
+
+        WORKER_NOT_RUNNING      = WORKER_PREP | WORKER_ROGUE | WORKER_REBIND |
+                                  WORKER_CPU_INTENSIVE | WORKER_UNBOUND,
+
+        /* gcwq->trustee_state */
+        TRUSTEE_START           = 0,            /* start */
+        TRUSTEE_IN_CHARGE       = 1,            /* trustee in charge of gcwq */
+        TRUSTEE_BUTCHER         = 2,            /* butcher workers */
+        TRUSTEE_RELEASE         = 3,            /* release workers */
+        TRUSTEE_DONE            = 4,            /* trustee is done */
+
+        BUSY_WORKER_HASH_ORDER  = 6,            /* 64 pointers */
+        BUSY_WORKER_HASH_SIZE   = 1 << BUSY_WORKER_HASH_ORDER,
+        BUSY_WORKER_HASH_MASK   = BUSY_WORKER_HASH_SIZE - 1,
+
+        MAX_IDLE_WORKERS_RATIO  = 4,            /* 1/4 of busy can be idle */
+        IDLE_WORKER_TIMEOUT     = 300 * HZ,     /* keep idle ones for 5 mins */
+
+        MAYDAY_INITIAL_TIMEOUT  = HZ / 100,     /* call for help after 10ms */
+        MAYDAY_INTERVAL         = HZ / 10,      /* and then every 100ms */
+        CREATE_COOLDOWN         = HZ,           /* time to breath after fail */
+        TRUSTEE_COOLDOWN        = HZ / 10,      /* for trustee draining */
+
+        /*
+         * Rescue workers are used only on emergencies and shared by
+         * all cpus.  Give -20.
+         */
+        RESCUER_NICE_LEVEL      = -20,
+};
+
 /*
- * The per-CPU workqueue (if single thread, we always use the first
- * possible cpu).
+ * Structure fields follow one of the following exclusion rules.
+ *
+ * I: Set during initialization and read-only afterwards.
+ *
+ * P: Preemption protected.  Disabling preemption is enough and should
+ *    only be modified and accessed from the local cpu.
+ *
+ * L: gcwq->lock protected.  Access with gcwq->lock held.
+ *
+ * X: During normal operation, modification requires gcwq->lock and
+ *    should be done only from local cpu.  Either disabling preemption
+ *    on local cpu or grabbing gcwq->lock is enough for read access.
+ *    If GCWQ_DISASSOCIATED is set, it's identical to L.
+ *
+ * F: wq->flush_mutex protected.
+ *
+ * W: workqueue_lock protected.
  */
-struct cpu_workqueue_struct {
 
-        spinlock_t lock;
+struct global_cwq;
+
+/*
+ * The poor guys doing the actual heavy lifting.  All on-duty workers
+ * are either serving the manager role, on idle list or on busy hash.
+ */
+struct worker {
+        /* on idle list while idle, on busy hash table while busy */
+        union {
+                struct list_head        entry;  /* L: while idle */
+                struct hlist_node       hentry; /* L: while busy */
+        };
+
+        struct work_struct      *current_work;  /* L: work being processed */
+        struct cpu_workqueue_struct *current_cwq; /* L: current_work's cwq */
+        struct list_head        scheduled;      /* L: scheduled works */
+        struct task_struct      *task;          /* I: worker task */
+        struct global_cwq       *gcwq;          /* I: the associated gcwq */
+        /* 64 bytes boundary on 64bit, 32 on 32bit */
+        unsigned long           last_active;    /* L: last active timestamp */
+        unsigned int            flags;          /* X: flags */
+        int                     id;             /* I: worker id */
+        struct work_struct      rebind_work;    /* L: rebind worker to cpu */
+};
+
+/*
+ * Global per-cpu workqueue.  There's one and only one for each cpu
+ * and all works are queued and processed here regardless of their
+ * target workqueues.
+ */
+struct global_cwq {
+        spinlock_t              lock;           /* the gcwq lock */
+        struct list_head        worklist;       /* L: list of pending works */
+        unsigned int            cpu;            /* I: the associated cpu */
+        unsigned int            flags;          /* L: GCWQ_* flags */
 
-        struct list_head worklist;
-        wait_queue_head_t more_work;
-        struct work_struct *current_work;
+        int                     nr_workers;     /* L: total number of workers */
+        int                     nr_idle;        /* L: currently idle ones */
 
-        struct workqueue_struct *wq;
-        struct task_struct *thread;
-} ____cacheline_aligned;
+        /* workers are chained either in the idle_list or busy_hash */
+        struct list_head        idle_list;      /* X: list of idle workers */
+        struct hlist_head       busy_hash[BUSY_WORKER_HASH_SIZE];
+                                                /* L: hash of busy workers */
+
+        struct timer_list       idle_timer;     /* L: worker idle timeout */
+        struct timer_list       mayday_timer;   /* L: SOS timer for dworkers */
+
+        struct ida              worker_ida;     /* L: for worker IDs */
+
+        struct task_struct      *trustee;       /* L: for gcwq shutdown */
+        unsigned int            trustee_state;  /* L: trustee state */
+        wait_queue_head_t       trustee_wait;   /* trustee wait */
+        struct worker           *first_idle;    /* L: first idle worker */
+} ____cacheline_aligned_in_smp;
+
+/*
+ * The per-CPU workqueue.  The lower WORK_STRUCT_FLAG_BITS of
+ * work_struct->data are used for flags and thus cwqs need to be
+ * aligned at two's power of the number of flag bits.
+ */
+struct cpu_workqueue_struct {
+        struct global_cwq       *gcwq;          /* I: the associated gcwq */
+        struct workqueue_struct *wq;            /* I: the owning workqueue */
+        int                     work_color;     /* L: current color */
+        int                     flush_color;    /* L: flushing color */
+        int                     nr_in_flight[WORK_NR_COLORS];
+                                                /* L: nr of in_flight works */
+        int                     nr_active;      /* L: nr of active works */
+        int                     max_active;     /* L: max active works */
+        struct list_head        delayed_works;  /* L: delayed works */
+};
+
+/*
+ * Structure used to wait for workqueue flush.
+ */
+struct wq_flusher {
+        struct list_head        list;           /* F: list of flushers */
+        int                     flush_color;    /* F: flush color waiting for */
+        struct completion       done;           /* flush completion */
+};
+
+/*
+ * All cpumasks are assumed to be always set on UP and thus can't be
+ * used to determine whether there's something to be done.
+ */
+#ifdef CONFIG_SMP
+typedef cpumask_var_t mayday_mask_t;
+#define mayday_test_and_set_cpu(cpu, mask)      \
+        cpumask_test_and_set_cpu((cpu), (mask))
+#define mayday_clear_cpu(cpu, mask)             cpumask_clear_cpu((cpu), (mask))
+#define for_each_mayday_cpu(cpu, mask)          for_each_cpu((cpu), (mask))
+#define alloc_mayday_mask(maskp, gfp)           alloc_cpumask_var((maskp), (gfp))
+#define free_mayday_mask(mask)                  free_cpumask_var((mask))
+#else
+typedef unsigned long mayday_mask_t;
+#define mayday_test_and_set_cpu(cpu, mask)      test_and_set_bit(0, &(mask))
+#define mayday_clear_cpu(cpu, mask)             clear_bit(0, &(mask))
+#define for_each_mayday_cpu(cpu, mask)          if ((cpu) = 0, (mask))
+#define alloc_mayday_mask(maskp, gfp)           true
+#define free_mayday_mask(mask)                  do { } while (0)
+#endif
 
 /*
  * The externally visible workqueue abstraction is an array of
  * per-CPU workqueues:
  */
 struct workqueue_struct {
-        struct cpu_workqueue_struct *cpu_wq;
-        struct list_head list;
-        const char *name;
-        int singlethread;
-        int freezeable;         /* Freeze threads during suspend */
-        int rt;
+        unsigned int            flags;          /* I: WQ_* flags */
+        union {
+                struct cpu_workqueue_struct __percpu    *pcpu;
+                struct cpu_workqueue_struct             *single;
+                unsigned long                           v;
+        } cpu_wq;                               /* I: cwq's */
+        struct list_head        list;           /* W: list of all workqueues */
+
+        struct mutex            flush_mutex;    /* protects wq flushing */
+        int                     work_color;     /* F: current work color */
+        int                     flush_color;    /* F: current flush color */
+        atomic_t                nr_cwqs_to_flush; /* flush in progress */
+        struct wq_flusher       *first_flusher; /* F: first flusher */
+        struct list_head        flusher_queue;  /* F: flush waiters */
+        struct list_head        flusher_overflow; /* F: flush overflow list */
+
+        mayday_mask_t           mayday_mask;    /* cpus requesting rescue */
+        struct worker           *rescuer;       /* I: rescue worker */
+
+        int                     saved_max_active; /* W: saved cwq max_active */
+        const char              *name;          /* I: workqueue name */
 #ifdef CONFIG_LOCKDEP
-        struct lockdep_map lockdep_map;
+        struct lockdep_map      lockdep_map;
 #endif
 };
 
+struct workqueue_struct *system_wq __read_mostly;
+struct workqueue_struct *system_long_wq __read_mostly;
+struct workqueue_struct *system_nrt_wq __read_mostly;
+struct workqueue_struct *system_unbound_wq __read_mostly;
+EXPORT_SYMBOL_GPL(system_wq);
+EXPORT_SYMBOL_GPL(system_long_wq);
+EXPORT_SYMBOL_GPL(system_nrt_wq);
+EXPORT_SYMBOL_GPL(system_unbound_wq);
+
+#define for_each_busy_worker(worker, i, pos, gcwq)                      \
+        for (i = 0; i < BUSY_WORKER_HASH_SIZE; i++)                     \
+                hlist_for_each_entry(worker, pos, &gcwq->busy_hash[i], hentry)
+
+static inline int __next_gcwq_cpu(int cpu, const struct cpumask *mask,
+                                  unsigned int sw)
+{
+        if (cpu < nr_cpu_ids) {
+                if (sw & 1) {
+                        cpu = cpumask_next(cpu, mask);
+                        if (cpu < nr_cpu_ids)
+                                return cpu;
+                }
+                if (sw & 2)
+                        return WORK_CPU_UNBOUND;
+        }
+        return WORK_CPU_NONE;
+}
+
+static inline int __next_wq_cpu(int cpu, const struct cpumask *mask,
+                                struct workqueue_struct *wq)
+{
+        return __next_gcwq_cpu(cpu, mask, !(wq->flags & WQ_UNBOUND) ? 1 : 2);
+}
+
+/*
+ * CPU iterators
+ *
+ * An extra gcwq is defined for an invalid cpu number
+ * (WORK_CPU_UNBOUND) to host workqueues which are not bound to any
+ * specific CPU.  The following iterators are similar to
+ * for_each_*_cpu() iterators but also considers the unbound gcwq.
+ *
+ * for_each_gcwq_cpu()          : possible CPUs + WORK_CPU_UNBOUND
+ * for_each_online_gcwq_cpu()   : online CPUs + WORK_CPU_UNBOUND
+ * for_each_cwq_cpu()           : possible CPUs for bound workqueues,
+ *                                WORK_CPU_UNBOUND for unbound workqueues
+ */
+#define for_each_gcwq_cpu(cpu)                                          \
+        for ((cpu) = __next_gcwq_cpu(-1, cpu_possible_mask, 3);         \
+             (cpu) < WORK_CPU_NONE;                                     \
+             (cpu) = __next_gcwq_cpu((cpu), cpu_possible_mask, 3))
+
+#define for_each_online_gcwq_cpu(cpu)                                   \
+        for ((cpu) = __next_gcwq_cpu(-1, cpu_online_mask, 3);           \
+             (cpu) < WORK_CPU_NONE;                                     \
+             (cpu) = __next_gcwq_cpu((cpu), cpu_online_mask, 3))
+
+#define for_each_cwq_cpu(cpu, wq)                                       \
+        for ((cpu) = __next_wq_cpu(-1, cpu_possible_mask, (wq));        \
+             (cpu) < WORK_CPU_NONE;                                     \
+             (cpu) = __next_wq_cpu((cpu), cpu_possible_mask, (wq)))
+
+#ifdef CONFIG_LOCKDEP
+/**
+ * in_workqueue_context() - in context of specified workqueue?
+ * @wq: the workqueue of interest
+ *
+ * Checks lockdep state to see if the current task is executing from
+ * within a workqueue item.  This function exists only if lockdep is
+ * enabled.
+ */
+int in_workqueue_context(struct workqueue_struct *wq)
+{
+        return lock_is_held(&wq->lockdep_map);
+}
+#endif
+
 #ifdef CONFIG_DEBUG_OBJECTS_WORK
 
 static struct debug_obj_descr work_debug_descr;
@@ -107,7 +356,7 @@ static int work_fixup_activate(void *addr, enum debug_obj_state state)
                  * statically initialized. We just make sure that it
                  * is tracked in the object tracker.
                  */
-                if (test_bit(WORK_STRUCT_STATIC, work_data_bits(work))) {
+                if (test_bit(WORK_STRUCT_STATIC_BIT, work_data_bits(work))) {
                         debug_object_init(work, &work_debug_descr);
                         debug_object_activate(work, &work_debug_descr);
                         return 0;
@@ -181,94 +430,575 @@ static inline void debug_work_deactivate(struct work_struct *work) { }
 /* Serializes the accesses to the list of workqueues. */
 static DEFINE_SPINLOCK(workqueue_lock);
 static LIST_HEAD(workqueues);
+static bool workqueue_freezing;         /* W: have wqs started freezing? */
+
+/*
+ * The almighty global cpu workqueues.  nr_running is the only field
+ * which is expected to be used frequently by other cpus via
+ * try_to_wake_up().  Put it in a separate cacheline.
+ */
+static DEFINE_PER_CPU(struct global_cwq, global_cwq);
+static DEFINE_PER_CPU_SHARED_ALIGNED(atomic_t, gcwq_nr_running);
 
-static int singlethread_cpu __read_mostly;
-static const struct cpumask *cpu_singlethread_map __read_mostly;
 /*
- * _cpu_down() first removes CPU from cpu_online_map, then CPU_DEAD
- * flushes cwq->worklist. This means that flush_workqueue/wait_on_work
- * which comes in between can't use for_each_online_cpu(). We could
- * use cpu_possible_map, the cpumask below is more a documentation
- * than optimization.
+ * Global cpu workqueue and nr_running counter for unbound gcwq.  The
+ * gcwq is always online, has GCWQ_DISASSOCIATED set, and all its
+ * workers have WORKER_UNBOUND set.
  */
-static cpumask_var_t cpu_populated_map __read_mostly;
+static struct global_cwq unbound_global_cwq;
+static atomic_t unbound_gcwq_nr_running = ATOMIC_INIT(0);       /* always 0 */
+
+static int worker_thread(void *__worker);
+
+static struct global_cwq *get_gcwq(unsigned int cpu)
+{
+        if (cpu != WORK_CPU_UNBOUND)
+                return &per_cpu(global_cwq, cpu);
+        else
+                return &unbound_global_cwq;
+}
+
+static atomic_t *get_gcwq_nr_running(unsigned int cpu)
+{
+        if (cpu != WORK_CPU_UNBOUND)
+                return &per_cpu(gcwq_nr_running, cpu);
+        else
+                return &unbound_gcwq_nr_running;
+}
 
-/* If it's single threaded, it isn't in the list of workqueues. */
-static inline int is_wq_single_threaded(struct workqueue_struct *wq)
+static struct cpu_workqueue_struct *get_cwq(unsigned int cpu,
+                                            struct workqueue_struct *wq)
 {
-        return wq->singlethread;
+        if (!(wq->flags & WQ_UNBOUND)) {
+                if (likely(cpu < nr_cpu_ids)) {
+#ifdef CONFIG_SMP
+                        return per_cpu_ptr(wq->cpu_wq.pcpu, cpu);
+#else
+                        return wq->cpu_wq.single;
+#endif
+                }
+        } else if (likely(cpu == WORK_CPU_UNBOUND))
+                return wq->cpu_wq.single;
+        return NULL;
 }
 
-static const struct cpumask *wq_cpu_map(struct workqueue_struct *wq)
+static unsigned int work_color_to_flags(int color)
 {
-        return is_wq_single_threaded(wq)
-                ? cpu_singlethread_map : cpu_populated_map;
+        return color << WORK_STRUCT_COLOR_SHIFT;
 }
 
-static
-struct cpu_workqueue_struct *wq_per_cpu(struct workqueue_struct *wq, int cpu)
+static int get_work_color(struct work_struct *work)
 {
-        if (unlikely(is_wq_single_threaded(wq)))
-                cpu = singlethread_cpu;
-        return per_cpu_ptr(wq->cpu_wq, cpu);
+        return (*work_data_bits(work) >> WORK_STRUCT_COLOR_SHIFT) &
+                ((1 << WORK_STRUCT_COLOR_BITS) - 1);
+}
+
+static int work_next_color(int color)
+{
+        return (color + 1) % WORK_NR_COLORS;
 }
 
 /*
- * Set the workqueue on which a work item is to be run
- * - Must *only* be called if the pending flag is set
+ * A work's data points to the cwq with WORK_STRUCT_CWQ set while the
+ * work is on queue.  Once execution starts, WORK_STRUCT_CWQ is
+ * cleared and the work data contains the cpu number it was last on.
+ *
+ * set_work_{cwq|cpu}() and clear_work_data() can be used to set the
+ * cwq, cpu or clear work->data.  These functions should only be
+ * called while the work is owned - ie. while the PENDING bit is set.
+ *
+ * get_work_[g]cwq() can be used to obtain the gcwq or cwq
+ * corresponding to a work.  gcwq is available once the work has been
+ * queued anywhere after initialization.  cwq is available only from
+ * queueing until execution starts.
  */
-static inline void set_wq_data(struct work_struct *work,
-                                struct cpu_workqueue_struct *cwq)
+static inline void set_work_data(struct work_struct *work, unsigned long data,
+                                 unsigned long flags)
 {
-        unsigned long new;
-
         BUG_ON(!work_pending(work));
+        atomic_long_set(&work->data, data | flags | work_static(work));
+}
 
-        new = (unsigned long) cwq | (1UL << WORK_STRUCT_PENDING);
-        new |= WORK_STRUCT_FLAG_MASK & *work_data_bits(work);
-        atomic_long_set(&work->data, new);
+static void set_work_cwq(struct work_struct *work,
+                         struct cpu_workqueue_struct *cwq,
+                         unsigned long extra_flags)
+{
+        set_work_data(work, (unsigned long)cwq,
+                      WORK_STRUCT_PENDING | WORK_STRUCT_CWQ | extra_flags);
+}
+
+static void set_work_cpu(struct work_struct *work, unsigned int cpu)
+{
+        set_work_data(work, cpu << WORK_STRUCT_FLAG_BITS, WORK_STRUCT_PENDING);
+}
+
+static void clear_work_data(struct work_struct *work)
+{
+        set_work_data(work, WORK_STRUCT_NO_CPU, 0);
+}
+
+static struct cpu_workqueue_struct *get_work_cwq(struct work_struct *work)
+{
+        unsigned long data = atomic_long_read(&work->data);
+
+        if (data & WORK_STRUCT_CWQ)
+                return (void *)(data & WORK_STRUCT_WQ_DATA_MASK);
+        else
+                return NULL;
+}
+
+static struct global_cwq *get_work_gcwq(struct work_struct *work)
+{
+        unsigned long data = atomic_long_read(&work->data);
+        unsigned int cpu;
+
+        if (data & WORK_STRUCT_CWQ)
+                return ((struct cpu_workqueue_struct *)
+                        (data & WORK_STRUCT_WQ_DATA_MASK))->gcwq;
+
+        cpu = data >> WORK_STRUCT_FLAG_BITS;
+        if (cpu == WORK_CPU_NONE)
+                return NULL;
+
+        BUG_ON(cpu >= nr_cpu_ids && cpu != WORK_CPU_UNBOUND);
+        return get_gcwq(cpu);
+}
+
+/*
+ * Policy functions.  These define the policies on how the global
+ * worker pool is managed.  Unless noted otherwise, these functions
+ * assume that they're being called with gcwq->lock held.
+ */
+
+static bool __need_more_worker(struct global_cwq *gcwq)
+{
+        return !atomic_read(get_gcwq_nr_running(gcwq->cpu)) ||
+                gcwq->flags & GCWQ_HIGHPRI_PENDING;
 }
 
 /*
- * Clear WORK_STRUCT_PENDING and the workqueue on which it was queued.
+ * Need to wake up a worker?  Called from anything but currently
+ * running workers.
  */
-static inline void clear_wq_data(struct work_struct *work)
+static bool need_more_worker(struct global_cwq *gcwq)
 {
-        unsigned long flags = *work_data_bits(work) &
-                                (1UL << WORK_STRUCT_STATIC);
-        atomic_long_set(&work->data, flags);
+        return !list_empty(&gcwq->worklist) && __need_more_worker(gcwq);
 }
 
-static inline
-struct cpu_workqueue_struct *get_wq_data(struct work_struct *work)
+/* Can I start working?  Called from busy but !running workers. */
+static bool may_start_working(struct global_cwq *gcwq)
 {
-        return (void *) (atomic_long_read(&work->data) & WORK_STRUCT_WQ_DATA_MASK);
+        return gcwq->nr_idle;
 }
 
+/* Do I need to keep working?  Called from currently running workers. */
+static bool keep_working(struct global_cwq *gcwq)
+{
+        atomic_t *nr_running = get_gcwq_nr_running(gcwq->cpu);
+
+        return !list_empty(&gcwq->worklist) && atomic_read(nr_running) <= 1;
+}
+
+/* Do we need a new worker?  Called from manager. */
+static bool need_to_create_worker(struct global_cwq *gcwq)
+{
+        return need_more_worker(gcwq) && !may_start_working(gcwq);
+}
+
+/* Do I need to be the manager? */
+static bool need_to_manage_workers(struct global_cwq *gcwq)
+{
+        return need_to_create_worker(gcwq) || gcwq->flags & GCWQ_MANAGE_WORKERS;
+}
+
+/* Do we have too many workers and should some go away? */
+static bool too_many_workers(struct global_cwq *gcwq)
+{
+        bool managing = gcwq->flags & GCWQ_MANAGING_WORKERS;
+        int nr_idle = gcwq->nr_idle + managing; /* manager is considered idle */
+        int nr_busy = gcwq->nr_workers - nr_idle;
+
+        return nr_idle > 2 && (nr_idle - 2) * MAX_IDLE_WORKERS_RATIO >= nr_busy;
+}
+
+/*
+ * Wake up functions.
+ */
+
+/* Return the first worker.  Safe with preemption disabled */
+static struct worker *first_worker(struct global_cwq *gcwq)
+{
+        if (unlikely(list_empty(&gcwq->idle_list)))
+                return NULL;
+
+        return list_first_entry(&gcwq->idle_list, struct worker, entry);
+}
+
+/**
+ * wake_up_worker - wake up an idle worker
+ * @gcwq: gcwq to wake worker for
+ *
+ * Wake up the first idle worker of @gcwq.
+ *
+ * CONTEXT:
+ * spin_lock_irq(gcwq->lock).
+ */
+static void wake_up_worker(struct global_cwq *gcwq)
+{
+        struct worker *worker = first_worker(gcwq);
+
+        if (likely(worker))
+                wake_up_process(worker->task);
+}
+
+/**
+ * wq_worker_waking_up - a worker is waking up
+ * @task: task waking up
+ * @cpu: CPU @task is waking up to
+ *
+ * This function is called during try_to_wake_up() when a worker is
+ * being awoken.
+ *
+ * CONTEXT:
+ * spin_lock_irq(rq->lock)
+ */
+void wq_worker_waking_up(struct task_struct *task, unsigned int cpu)
+{
+        struct worker *worker = kthread_data(task);
+
+        if (likely(!(worker->flags & WORKER_NOT_RUNNING)))
+                atomic_inc(get_gcwq_nr_running(cpu));
+}
+
+/**
+ * wq_worker_sleeping - a worker is going to sleep
+ * @task: task going to sleep
+ * @cpu: CPU in question, must be the current CPU number
+ *
+ * This function is called during schedule() when a busy worker is
+ * going to sleep.  Worker on the same cpu can be woken up by
+ * returning pointer to its task.
+ *
+ * CONTEXT:
+ * spin_lock_irq(rq->lock)
+ *
+ * RETURNS:
+ * Worker task on @cpu to wake up, %NULL if none.
+ */
+struct task_struct *wq_worker_sleeping(struct task_struct *task,
+                                       unsigned int cpu)
+{
+        struct worker *worker = kthread_data(task), *to_wakeup = NULL;
+        struct global_cwq *gcwq = get_gcwq(cpu);
+        atomic_t *nr_running = get_gcwq_nr_running(cpu);
+
+        if (unlikely(worker->flags & WORKER_NOT_RUNNING))
+                return NULL;
+
+        /* this can only happen on the local cpu */
+        BUG_ON(cpu != raw_smp_processor_id());
+
+        /*
+         * The counterpart of the following dec_and_test, implied mb,
+         * worklist not empty test sequence is in insert_work().
+         * Please read comment there.
+         *
+         * NOT_RUNNING is clear.  This means that trustee is not in
+         * charge and we're running on the local cpu w/ rq lock held
+         * and preemption disabled, which in turn means that none else
+         * could be manipulating idle_list, so dereferencing idle_list
+         * without gcwq lock is safe.
+         */
+        if (atomic_dec_and_test(nr_running) && !list_empty(&gcwq->worklist))
+                to_wakeup = first_worker(gcwq);
+        return to_wakeup ? to_wakeup->task : NULL;
+}
+
+/**
+ * worker_set_flags - set worker flags and adjust nr_running accordingly
+ * @worker: self
+ * @flags: flags to set
+ * @wakeup: wakeup an idle worker if necessary
+ *
+ * Set @flags in @worker->flags and adjust nr_running accordingly.  If
+ * nr_running becomes zero and @wakeup is %true, an idle worker is
+ * woken up.
+ *
+ * CONTEXT:
+ * spin_lock_irq(gcwq->lock)
+ */
+static inline void worker_set_flags(struct worker *worker, unsigned int flags,
+                                    bool wakeup)
+{
+        struct global_cwq *gcwq = worker->gcwq;
+
+        WARN_ON_ONCE(worker->task != current);
+
+        /*
+         * If transitioning into NOT_RUNNING, adjust nr_running and
+         * wake up an idle worker as necessary if requested by
+         * @wakeup.
+         */
+        if ((flags & WORKER_NOT_RUNNING) &&
+            !(worker->flags & WORKER_NOT_RUNNING)) {
+                atomic_t *nr_running = get_gcwq_nr_running(gcwq->cpu);
+
+                if (wakeup) {
+                        if (atomic_dec_and_test(nr_running) &&
+                            !list_empty(&gcwq->worklist))
+                                wake_up_worker(gcwq);
+                } else
+                        atomic_dec(nr_running);
+        }
+
+        worker->flags |= flags;
+}
+
+/**
+ * worker_clr_flags - clear worker flags and adjust nr_running accordingly
+ * @worker: self
+ * @flags: flags to clear
+ *
+ * Clear @flags in @worker->flags and adjust nr_running accordingly.
+ *
+ * CONTEXT:
+ * spin_lock_irq(gcwq->lock)
+ */
+static inline void worker_clr_flags(struct worker *worker, unsigned int flags)
+{
+        struct global_cwq *gcwq = worker->gcwq;
+        unsigned int oflags = worker->flags;
+
+        WARN_ON_ONCE(worker->task != current);
+
+        worker->flags &= ~flags;
+
+        /* if transitioning out of NOT_RUNNING, increment nr_running */
+        if ((flags & WORKER_NOT_RUNNING) && (oflags & WORKER_NOT_RUNNING))
+                if (!(worker->flags & WORKER_NOT_RUNNING))
+                        atomic_inc(get_gcwq_nr_running(gcwq->cpu));
+}
+
+/**
+ * busy_worker_head - return the busy hash head for a work
+ * @gcwq: gcwq of interest
+ * @work: work to be hashed
+ *
+ * Return hash head of @gcwq for @work.
+ *
+ * CONTEXT:
+ * spin_lock_irq(gcwq->lock).
+ *
+ * RETURNS:
+ * Pointer to the hash head.
+ */
+static struct hlist_head *busy_worker_head(struct global_cwq *gcwq,
+                                           struct work_struct *work)
+{
+        const int base_shift = ilog2(sizeof(struct work_struct));
+        unsigned long v = (unsigned long)work;
+
+        /* simple shift and fold hash, do we need something better? */
+        v >>= base_shift;
+        v += v >> BUSY_WORKER_HASH_ORDER;
+        v &= BUSY_WORKER_HASH_MASK;
+
+        return &gcwq->busy_hash[v];
+}
+
+/**
+ * __find_worker_executing_work - find worker which is executing a work
+ * @gcwq: gcwq of interest
+ * @bwh: hash head as returned by busy_worker_head()
+ * @work: work to find worker for
+ *
+ * Find a worker which is executing @work on @gcwq.  @bwh should be
+ * the hash head obtained by calling busy_worker_head() with the same
+ * work.
+ *
+ * CONTEXT:
+ * spin_lock_irq(gcwq->lock).
+ *
+ * RETURNS:
+ * Pointer to worker which is executing @work if found, NULL
+ * otherwise.
+ */
+static struct worker *__find_worker_executing_work(struct global_cwq *gcwq,
+                                                   struct hlist_head *bwh,
+                                                   struct work_struct *work)
+{
+        struct worker *worker;
+        struct hlist_node *tmp;
+
+        hlist_for_each_entry(worker, tmp, bwh, hentry)
+                if (worker->current_work == work)
+                        return worker;
+        return NULL;
+}
+
+/**
+ * find_worker_executing_work - find worker which is executing a work
+ * @gcwq: gcwq of interest
+ * @work: work to find worker for
+ *
+ * Find a worker which is executing @work on @gcwq.  This function is
+ * identical to __find_worker_executing_work() except that this
+ * function calculates @bwh itself.
+ *
+ * CONTEXT:
+ * spin_lock_irq(gcwq->lock).
+ *
+ * RETURNS:
+ * Pointer to worker which is executing @work if found, NULL
+ * otherwise.
+ */
+static struct worker *find_worker_executing_work(struct global_cwq *gcwq,
+                                                 struct work_struct *work)
+{
+        return __find_worker_executing_work(gcwq, busy_worker_head(gcwq, work),
+                                            work);
+}
+
+/**
+ * gcwq_determine_ins_pos - find insertion position
+ * @gcwq: gcwq of interest
+ * @cwq: cwq a work is being queued for
+ *
+ * A work for @cwq is about to be queued on @gcwq, determine insertion
+ * position for the work.  If @cwq is for HIGHPRI wq, the work is
+ * queued at the head of the queue but in FIFO order with respect to
+ * other HIGHPRI works; otherwise, at the end of the queue.  This
+ * function also sets GCWQ_HIGHPRI_PENDING flag to hint @gcwq that
+ * there are HIGHPRI works pending.
+ *
+ * CONTEXT:
+ * spin_lock_irq(gcwq->lock).
+ *
+ * RETURNS:
+ * Pointer to inserstion position.
+ */
+static inline struct list_head *gcwq_determine_ins_pos(struct global_cwq *gcwq,
+                                               struct cpu_workqueue_struct *cwq)
+{
+        struct work_struct *twork;
+
+        if (likely(!(cwq->wq->flags & WQ_HIGHPRI)))
+                return &gcwq->worklist;
+
+        list_for_each_entry(twork, &gcwq->worklist, entry) {
+                struct cpu_workqueue_struct *tcwq = get_work_cwq(twork);
+
+                if (!(tcwq->wq->flags & WQ_HIGHPRI))
+                        break;
+        }
+
+        gcwq->flags |= GCWQ_HIGHPRI_PENDING;
+        return &twork->entry;
+}
+
+/**
+ * insert_work - insert a work into gcwq
+ * @cwq: cwq @work belongs to
+ * @work: work to insert
+ * @head: insertion point
+ * @extra_flags: extra WORK_STRUCT_* flags to set
+ *
+ * Insert @work which belongs to @cwq into @gcwq after @head.
+ * @extra_flags is or'd to work_struct flags.
+ *
+ * CONTEXT:
+ * spin_lock_irq(gcwq->lock).
+ */
 static void insert_work(struct cpu_workqueue_struct *cwq,
-                        struct work_struct *work, struct list_head *head)
+                        struct work_struct *work, struct list_head *head,
+                        unsigned int extra_flags)
 {
-        trace_workqueue_insertion(cwq->thread, work);
+        struct global_cwq *gcwq = cwq->gcwq;
+
+        /* we own @work, set data and link */
+        set_work_cwq(work, cwq, extra_flags);
 
-        set_wq_data(work, cwq);
         /*
          * Ensure that we get the right work->data if we see the
          * result of list_add() below, see try_to_grab_pending().
          */
         smp_wmb();
+
         list_add_tail(&work->entry, head);
-        wake_up(&cwq->more_work);
+
+        /*
+         * Ensure either worker_sched_deactivated() sees the above
+         * list_add_tail() or we see zero nr_running to avoid workers
+         * lying around lazily while there are works to be processed.
+         */
+        smp_mb();
+
+        if (__need_more_worker(gcwq))
+                wake_up_worker(gcwq);
 }
 
-static void __queue_work(struct cpu_workqueue_struct *cwq,
+static void __queue_work(unsigned int cpu, struct workqueue_struct *wq,
                          struct work_struct *work)
 {
+        struct global_cwq *gcwq;
+        struct cpu_workqueue_struct *cwq;
+        struct list_head *worklist;
         unsigned long flags;
 
         debug_work_activate(work);
-        spin_lock_irqsave(&cwq->lock, flags);
-        insert_work(cwq, work, &cwq->worklist);
-        spin_unlock_irqrestore(&cwq->lock, flags);
+
+        /* determine gcwq to use */
+        if (!(wq->flags & WQ_UNBOUND)) {
+                struct global_cwq *last_gcwq;
+
+                if (unlikely(cpu == WORK_CPU_UNBOUND))
+                        cpu = raw_smp_processor_id();
+
+                /*
+                 * It's multi cpu.  If @wq is non-reentrant and @work
+                 * was previously on a different cpu, it might still
+                 * be running there, in which case the work needs to
+                 * be queued on that cpu to guarantee non-reentrance.
+                 */
+                gcwq = get_gcwq(cpu);
+                if (wq->flags & WQ_NON_REENTRANT &&
+                    (last_gcwq = get_work_gcwq(work)) && last_gcwq != gcwq) {
+                        struct worker *worker;
+
+                        spin_lock_irqsave(&last_gcwq->lock, flags);
+
+                        worker = find_worker_executing_work(last_gcwq, work);
+
+                        if (worker && worker->current_cwq->wq == wq)
+                                gcwq = last_gcwq;
+                        else {
+                                /* meh... not running there, queue here */
+                                spin_unlock_irqrestore(&last_gcwq->lock, flags);
+                                spin_lock_irqsave(&gcwq->lock, flags);
+                        }
+                } else
+                        spin_lock_irqsave(&gcwq->lock, flags);
+        } else {
+                gcwq = get_gcwq(WORK_CPU_UNBOUND);
+                spin_lock_irqsave(&gcwq->lock, flags);
+        }
+
+        /* gcwq determined, get cwq and queue */
+        cwq = get_cwq(gcwq->cpu, wq);
+
+        BUG_ON(!list_empty(&work->entry));
+
+        cwq->nr_in_flight[cwq->work_color]++;
+
+        if (likely(cwq->nr_active < cwq->max_active)) {
+                cwq->nr_active++;
+                worklist = gcwq_determine_ins_pos(gcwq, cwq);
+        } else
+                worklist = &cwq->delayed_works;
+
+        insert_work(cwq, work, worklist, work_color_to_flags(cwq->work_color));
+
+        spin_unlock_irqrestore(&gcwq->lock, flags);
 }
 
 /**
@@ -308,9 +1038,8 @@ queue_work_on(int cpu, struct workqueue_struct *wq, struct work_struct *work)
 {
         int ret = 0;
 
-        if (!test_and_set_bit(WORK_STRUCT_PENDING, work_data_bits(work))) {
-                BUG_ON(!list_empty(&work->entry));
-                __queue_work(wq_per_cpu(wq, cpu), work);
+        if (!test_and_set_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(work))) {
+                __queue_work(cpu, wq, work);
                 ret = 1;
         }
         return ret;
@@ -320,10 +1049,9 @@ EXPORT_SYMBOL_GPL(queue_work_on);
 static void delayed_work_timer_fn(unsigned long __data)
 {
         struct delayed_work *dwork = (struct delayed_work *)__data;
-        struct cpu_workqueue_struct *cwq = get_wq_data(&dwork->work);
-        struct workqueue_struct *wq = cwq->wq;
+        struct cpu_workqueue_struct *cwq = get_work_cwq(&dwork->work);
 
-        __queue_work(wq_per_cpu(wq, smp_processor_id()), &dwork->work);
+        __queue_work(smp_processor_id(), cwq->wq, &dwork->work);
 }
 
 /**
@@ -360,14 +1088,31 @@ int queue_delayed_work_on(int cpu, struct workqueue_struct *wq,
         struct timer_list *timer = &dwork->timer;
         struct work_struct *work = &dwork->work;
 
-        if (!test_and_set_bit(WORK_STRUCT_PENDING, work_data_bits(work))) {
+        if (!test_and_set_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(work))) {
+                unsigned int lcpu;
+
                 BUG_ON(timer_pending(timer));
                 BUG_ON(!list_empty(&work->entry));
 
                 timer_stats_timer_set_start_info(&dwork->timer);
 
-                /* This stores cwq for the moment, for the timer_fn */
-                set_wq_data(work, wq_per_cpu(wq, raw_smp_processor_id()));
+                /*
+                 * This stores cwq for the moment, for the timer_fn.
+                 * Note that the work's gcwq is preserved to allow
+                 * reentrance detection for delayed works.
+                 */
+                if (!(wq->flags & WQ_UNBOUND)) {
+                        struct global_cwq *gcwq = get_work_gcwq(work);
+
+                        if (gcwq && gcwq->cpu != WORK_CPU_UNBOUND)
+                                lcpu = gcwq->cpu;
+                        else
+                                lcpu = raw_smp_processor_id();
+                } else
+                        lcpu = WORK_CPU_UNBOUND;
+
+                set_work_cwq(work, get_cwq(lcpu, wq), 0);
+
                 timer->expires = jiffies + delay;
                 timer->data = (unsigned long)dwork;
                 timer->function = delayed_work_timer_fn;
@@ -382,80 +1127,878 @@ int queue_delayed_work_on(int cpu, struct workqueue_struct *wq,
 }
 EXPORT_SYMBOL_GPL(queue_delayed_work_on);
 
-static void run_workqueue(struct cpu_workqueue_struct *cwq)
+/**
+ * worker_enter_idle - enter idle state
+ * @worker: worker which is entering idle state
+ *
+ * @worker is entering idle state.  Update stats and idle timer if
+ * necessary.
+ *
+ * LOCKING:
+ * spin_lock_irq(gcwq->lock).
+ */
+static void worker_enter_idle(struct worker *worker)
 {
-        spin_lock_irq(&cwq->lock);
-        while (!list_empty(&cwq->worklist)) {
-                struct work_struct *work = list_entry(cwq->worklist.next,
-                                                struct work_struct, entry);
-                work_func_t f = work->func;
-#ifdef CONFIG_LOCKDEP
+        struct global_cwq *gcwq = worker->gcwq;
+
+        BUG_ON(worker->flags & WORKER_IDLE);
+        BUG_ON(!list_empty(&worker->entry) &&
+               (worker->hentry.next || worker->hentry.pprev));
+
+        /* can't use worker_set_flags(), also called from start_worker() */
+        worker->flags |= WORKER_IDLE;
+        gcwq->nr_idle++;
+        worker->last_active = jiffies;
+
+        /* idle_list is LIFO */
+        list_add(&worker->entry, &gcwq->idle_list);
+
+        if (likely(!(worker->flags & WORKER_ROGUE))) {
+                if (too_many_workers(gcwq) && !timer_pending(&gcwq->idle_timer))
+                        mod_timer(&gcwq->idle_timer,
+                                  jiffies + IDLE_WORKER_TIMEOUT);
+        } else
+                wake_up_all(&gcwq->trustee_wait);
+
+        /* sanity check nr_running */
+        WARN_ON_ONCE(gcwq->nr_workers == gcwq->nr_idle &&
+                     atomic_read(get_gcwq_nr_running(gcwq->cpu)));
+}
+
+/**
+ * worker_leave_idle - leave idle state
+ * @worker: worker which is leaving idle state
+ *
+ * @worker is leaving idle state.  Update stats.
+ *
+ * LOCKING:
+ * spin_lock_irq(gcwq->lock).
+ */
+static void worker_leave_idle(struct worker *worker)
+{
+        struct global_cwq *gcwq = worker->gcwq;
+
+        BUG_ON(!(worker->flags & WORKER_IDLE));
+        worker_clr_flags(worker, WORKER_IDLE);
+        gcwq->nr_idle--;
+        list_del_init(&worker->entry);
+}
+
+/**
+ * worker_maybe_bind_and_lock - bind worker to its cpu if possible and lock gcwq
+ * @worker: self
+ *
+ * Works which are scheduled while the cpu is online must at least be
+ * scheduled to a worker which is bound to the cpu so that if they are
+ * flushed from cpu callbacks while cpu is going down, they are
+ * guaranteed to execute on the cpu.
+ *
+ * This function is to be used by rogue workers and rescuers to bind
+ * themselves to the target cpu and may race with cpu going down or
+ * coming online.  kthread_bind() can't be used because it may put the
+ * worker to already dead cpu and set_cpus_allowed_ptr() can't be used
+ * verbatim as it's best effort and blocking and gcwq may be
+ * [dis]associated in the meantime.
+ *
+ * This function tries set_cpus_allowed() and locks gcwq and verifies
+ * the binding against GCWQ_DISASSOCIATED which is set during
+ * CPU_DYING and cleared during CPU_ONLINE, so if the worker enters
+ * idle state or fetches works without dropping lock, it can guarantee
+ * the scheduling requirement described in the first paragraph.
+ *
+ * CONTEXT:
+ * Might sleep.  Called without any lock but returns with gcwq->lock
+ * held.
+ *
+ * RETURNS:
+ * %true if the associated gcwq is online (@worker is successfully
+ * bound), %false if offline.
+ */
+static bool worker_maybe_bind_and_lock(struct worker *worker)
+{
+        struct global_cwq *gcwq = worker->gcwq;
+        struct task_struct *task = worker->task;
+
+        while (true) {
                 /*
-                 * It is permissible to free the struct work_struct
-                 * from inside the function that is called from it,
-                 * this we need to take into account for lockdep too.
-                 * To avoid bogus "held lock freed" warnings as well
-                 * as problems when looking into work->lockdep_map,
-                 * make a copy and use that here.
+                 * The following call may fail, succeed or succeed
+                 * without actually migrating the task to the cpu if
+                 * it races with cpu hotunplug operation.  Verify
+                 * against GCWQ_DISASSOCIATED.
                  */
-                struct lockdep_map lockdep_map = work->lockdep_map;
-#endif
-                trace_workqueue_execution(cwq->thread, work);
-                debug_work_deactivate(work);
-                cwq->current_work = work;
-                list_del_init(cwq->worklist.next);
-                spin_unlock_irq(&cwq->lock);
-
-                BUG_ON(get_wq_data(work) != cwq);
-                work_clear_pending(work);
-                lock_map_acquire(&cwq->wq->lockdep_map);
-                lock_map_acquire(&lockdep_map);
-                f(work);
-                lock_map_release(&lockdep_map);
-                lock_map_release(&cwq->wq->lockdep_map);
-
-                if (unlikely(in_atomic() || lockdep_depth(current) > 0)) {
-                        printk(KERN_ERR "BUG: workqueue leaked lock or atomic: "
-                                        "%s/0x%08x/%d\n",
-                                        current->comm, preempt_count(),
-                                        task_pid_nr(current));
-                        printk(KERN_ERR "    last function: ");
-                        print_symbol("%s\n", (unsigned long)f);
-                        debug_show_held_locks(current);
-                        dump_stack();
+                if (!(gcwq->flags & GCWQ_DISASSOCIATED))
+                        set_cpus_allowed_ptr(task, get_cpu_mask(gcwq->cpu));
+
+                spin_lock_irq(&gcwq->lock);
+                if (gcwq->flags & GCWQ_DISASSOCIATED)
+                        return false;
+                if (task_cpu(task) == gcwq->cpu &&
+                    cpumask_equal(&current->cpus_allowed,
+                                  get_cpu_mask(gcwq->cpu)))
+                        return true;
+                spin_unlock_irq(&gcwq->lock);
+
+                /* CPU has come up inbetween, retry migration */
+                cpu_relax();
+        }
+}
+
+/*
+ * Function for worker->rebind_work used to rebind rogue busy workers
+ * to the associated cpu which is coming back online.  This is
+ * scheduled by cpu up but can race with other cpu hotplug operations
+ * and may be executed twice without intervening cpu down.
+ */
+static void worker_rebind_fn(struct work_struct *work)
+{
+        struct worker *worker = container_of(work, struct worker, rebind_work);
+        struct global_cwq *gcwq = worker->gcwq;
+
+        if (worker_maybe_bind_and_lock(worker))
+                worker_clr_flags(worker, WORKER_REBIND);
+
+        spin_unlock_irq(&gcwq->lock);
+}
+
+static struct worker *alloc_worker(void)
+{
+        struct worker *worker;
+
+        worker = kzalloc(sizeof(*worker), GFP_KERNEL);
+        if (worker) {
+                INIT_LIST_HEAD(&worker->entry);
+                INIT_LIST_HEAD(&worker->scheduled);
+                INIT_WORK(&worker->rebind_work, worker_rebind_fn);
+                /* on creation a worker is in !idle && prep state */
+                worker->flags = WORKER_PREP;
+        }
+        return worker;
+}
+
+/**
+ * create_worker - create a new workqueue worker
+ * @gcwq: gcwq the new worker will belong to
+ * @bind: whether to set affinity to @cpu or not
+ *
+ * Create a new worker which is bound to @gcwq.  The returned worker
+ * can be started by calling start_worker() or destroyed using
+ * destroy_worker().
+ *
+ * CONTEXT:
+ * Might sleep.  Does GFP_KERNEL allocations.
+ *
+ * RETURNS:
+ * Pointer to the newly created worker.
+ */
+static struct worker *create_worker(struct global_cwq *gcwq, bool bind)
+{
+        bool on_unbound_cpu = gcwq->cpu == WORK_CPU_UNBOUND;
+        struct worker *worker = NULL;
+        int id = -1;
+
+        spin_lock_irq(&gcwq->lock);
+        while (ida_get_new(&gcwq->worker_ida, &id)) {
+                spin_unlock_irq(&gcwq->lock);
+                if (!ida_pre_get(&gcwq->worker_ida, GFP_KERNEL))
+                        goto fail;
+                spin_lock_irq(&gcwq->lock);
+        }
+        spin_unlock_irq(&gcwq->lock);
+
+        worker = alloc_worker();
+        if (!worker)
+                goto fail;
+
+        worker->gcwq = gcwq;
+        worker->id = id;
+
+        if (!on_unbound_cpu)
+                worker->task = kthread_create(worker_thread, worker,
+                                              "kworker/%u:%d", gcwq->cpu, id);
+        else
+                worker->task = kthread_create(worker_thread, worker,
+                                              "kworker/u:%d", id);
+        if (IS_ERR(worker->task))
+                goto fail;
+
+        /*
+         * A rogue worker will become a regular one if CPU comes
+         * online later on.  Make sure every worker has
+         * PF_THREAD_BOUND set.
+         */
+        if (bind && !on_unbound_cpu)
+                kthread_bind(worker->task, gcwq->cpu);
+        else {
+                worker->task->flags |= PF_THREAD_BOUND;
+                if (on_unbound_cpu)
+                        worker->flags |= WORKER_UNBOUND;
+        }
+
+        return worker;
+fail:
+        if (id >= 0) {
+                spin_lock_irq(&gcwq->lock);
+                ida_remove(&gcwq->worker_ida, id);
+                spin_unlock_irq(&gcwq->lock);
+        }
+        kfree(worker);
+        return NULL;
+}
+
+/**
+ * start_worker - start a newly created worker
+ * @worker: worker to start
+ *
+ * Make the gcwq aware of @worker and start it.
+ *
+ * CONTEXT:
+ * spin_lock_irq(gcwq->lock).
+ */
+static void start_worker(struct worker *worker)
+{
+        worker->flags |= WORKER_STARTED;
+        worker->gcwq->nr_workers++;
+        worker_enter_idle(worker);
+        wake_up_process(worker->task);
+}
+
+/**
+ * destroy_worker - destroy a workqueue worker
+ * @worker: worker to be destroyed
+ *
+ * Destroy @worker and adjust @gcwq stats accordingly.
+ *
+ * CONTEXT:
+ * spin_lock_irq(gcwq->lock) which is released and regrabbed.
+ */
+static void destroy_worker(struct worker *worker)
+{
+        struct global_cwq *gcwq = worker->gcwq;
+        int id = worker->id;
+
+        /* sanity check frenzy */
+        BUG_ON(worker->current_work);
+        BUG_ON(!list_empty(&worker->scheduled));
+
+        if (worker->flags & WORKER_STARTED)
+                gcwq->nr_workers--;
+        if (worker->flags & WORKER_IDLE)
+                gcwq->nr_idle--;
+
+        list_del_init(&worker->entry);
+        worker->flags |= WORKER_DIE;
+
+        spin_unlock_irq(&gcwq->lock);
+
+        kthread_stop(worker->task);
+        kfree(worker);
+
+        spin_lock_irq(&gcwq->lock);
+        ida_remove(&gcwq->worker_ida, id);
+}
+
+static void idle_worker_timeout(unsigned long __gcwq)
+{
+        struct global_cwq *gcwq = (void *)__gcwq;
+
+        spin_lock_irq(&gcwq->lock);
+
+        if (too_many_workers(gcwq)) {
+                struct worker *worker;
+                unsigned long expires;
+
+                /* idle_list is kept in LIFO order, check the last one */
+                worker = list_entry(gcwq->idle_list.prev, struct worker, entry);
+                expires = worker->last_active + IDLE_WORKER_TIMEOUT;
+
+                if (time_before(jiffies, expires))
+                        mod_timer(&gcwq->idle_timer, expires);
+                else {
+                        /* it's been idle for too long, wake up manager */
+                        gcwq->flags |= GCWQ_MANAGE_WORKERS;
+                        wake_up_worker(gcwq);
                 }
+        }
 
-                spin_lock_irq(&cwq->lock);
-                cwq->current_work = NULL;
+        spin_unlock_irq(&gcwq->lock);
+}
+
+static bool send_mayday(struct work_struct *work)
+{
+        struct cpu_workqueue_struct *cwq = get_work_cwq(work);
+        struct workqueue_struct *wq = cwq->wq;
+        unsigned int cpu;
+
+        if (!(wq->flags & WQ_RESCUER))
+                return false;
+
+        /* mayday mayday mayday */
+        cpu = cwq->gcwq->cpu;
+        /* WORK_CPU_UNBOUND can't be set in cpumask, use cpu 0 instead */
+        if (cpu == WORK_CPU_UNBOUND)
+                cpu = 0;
+        if (!mayday_test_and_set_cpu(cpu, wq->mayday_mask))
+                wake_up_process(wq->rescuer->task);
+        return true;
+}
+
+static void gcwq_mayday_timeout(unsigned long __gcwq)
+{
+        struct global_cwq *gcwq = (void *)__gcwq;
+        struct work_struct *work;
+
+        spin_lock_irq(&gcwq->lock);
+
+        if (need_to_create_worker(gcwq)) {
+                /*
+                 * We've been trying to create a new worker but
+                 * haven't been successful.  We might be hitting an
+                 * allocation deadlock.  Send distress signals to
+                 * rescuers.
+                 */
+                list_for_each_entry(work, &gcwq->worklist, entry)
+                        send_mayday(work);
         }
-        spin_unlock_irq(&cwq->lock);
+
+        spin_unlock_irq(&gcwq->lock);
+
+        mod_timer(&gcwq->mayday_timer, jiffies + MAYDAY_INTERVAL);
 }
 
-static int worker_thread(void *__cwq)
+/**
+ * maybe_create_worker - create a new worker if necessary
+ * @gcwq: gcwq to create a new worker for
+ *
+ * Create a new worker for @gcwq if necessary.  @gcwq is guaranteed to
+ * have at least one idle worker on return from this function.  If
+ * creating a new worker takes longer than MAYDAY_INTERVAL, mayday is
+ * sent to all rescuers with works scheduled on @gcwq to resolve
+ * possible allocation deadlock.
+ *
+ * On return, need_to_create_worker() is guaranteed to be false and
+ * may_start_working() true.
+ *
+ * LOCKING:
+ * spin_lock_irq(gcwq->lock) which may be released and regrabbed
+ * multiple times.  Does GFP_KERNEL allocations.  Called only from
+ * manager.
+ *
+ * RETURNS:
+ * false if no action was taken and gcwq->lock stayed locked, true
+ * otherwise.
+ */
+static bool maybe_create_worker(struct global_cwq *gcwq)
 {
-        struct cpu_workqueue_struct *cwq = __cwq;
-        DEFINE_WAIT(wait);
+        if (!need_to_create_worker(gcwq))
+                return false;
+restart:
+        spin_unlock_irq(&gcwq->lock);
+
+        /* if we don't make progress in MAYDAY_INITIAL_TIMEOUT, call for help */
+        mod_timer(&gcwq->mayday_timer, jiffies + MAYDAY_INITIAL_TIMEOUT);
+
+        while (true) {
+                struct worker *worker;
+
+                worker = create_worker(gcwq, true);
+                if (worker) {
+                        del_timer_sync(&gcwq->mayday_timer);
+                        spin_lock_irq(&gcwq->lock);
+                        start_worker(worker);
+                        BUG_ON(need_to_create_worker(gcwq));
+                        return true;
+                }
+
+                if (!need_to_create_worker(gcwq))
+                        break;
 
-        if (cwq->wq->freezeable)
-                set_freezable();
+                __set_current_state(TASK_INTERRUPTIBLE);
+                schedule_timeout(CREATE_COOLDOWN);
 
-        for (;;) {
-                prepare_to_wait(&cwq->more_work, &wait, TASK_INTERRUPTIBLE);
-                if (!freezing(current) &&
-                    !kthread_should_stop() &&
-                    list_empty(&cwq->worklist))
-                        schedule();
-                finish_wait(&cwq->more_work, &wait);
+                if (!need_to_create_worker(gcwq))
+                        break;
+        }
 
-                try_to_freeze();
+        del_timer_sync(&gcwq->mayday_timer);
+        spin_lock_irq(&gcwq->lock);
+        if (need_to_create_worker(gcwq))
+                goto restart;
+        return true;
+}
 
-                if (kthread_should_stop())
+/**
+ * maybe_destroy_worker - destroy workers which have been idle for a while
+ * @gcwq: gcwq to destroy workers for
+ *
+ * Destroy @gcwq workers which have been idle for longer than
+ * IDLE_WORKER_TIMEOUT.
+ *
+ * LOCKING:
+ * spin_lock_irq(gcwq->lock) which may be released and regrabbed
+ * multiple times.  Called only from manager.
+ *
+ * RETURNS:
+ * false if no action was taken and gcwq->lock stayed locked, true
+ * otherwise.
+ */
+static bool maybe_destroy_workers(struct global_cwq *gcwq)
+{
+        bool ret = false;
+
+        while (too_many_workers(gcwq)) {
+                struct worker *worker;
+                unsigned long expires;
+
+                worker = list_entry(gcwq->idle_list.prev, struct worker, entry);
+                expires = worker->last_active + IDLE_WORKER_TIMEOUT;
+
+                if (time_before(jiffies, expires)) {
+                        mod_timer(&gcwq->idle_timer, expires);
                         break;
+                }
 
-                run_workqueue(cwq);
+                destroy_worker(worker);
+                ret = true;
         }
 
-        return 0;
+        return ret;
+}
+
+/**
+ * manage_workers - manage worker pool
+ * @worker: self
+ *
+ * Assume the manager role and manage gcwq worker pool @worker belongs
+ * to.  At any given time, there can be only zero or one manager per
+ * gcwq.  The exclusion is handled automatically by this function.
+ *
+ * The caller can safely start processing works on false return.  On
+ * true return, it's guaranteed that need_to_create_worker() is false
+ * and may_start_working() is true.
+ *
+ * CONTEXT:
+ * spin_lock_irq(gcwq->lock) which may be released and regrabbed
+ * multiple times.  Does GFP_KERNEL allocations.
+ *
+ * RETURNS:
+ * false if no action was taken and gcwq->lock stayed locked, true if
+ * some action was taken.
+ */
+static bool manage_workers(struct worker *worker)
+{
+        struct global_cwq *gcwq = worker->gcwq;
+        bool ret = false;
+
+        if (gcwq->flags & GCWQ_MANAGING_WORKERS)
+                return ret;
+
+        gcwq->flags &= ~GCWQ_MANAGE_WORKERS;
+        gcwq->flags |= GCWQ_MANAGING_WORKERS;
+
+        /*
+         * Destroy and then create so that may_start_working() is true
+         * on return.
+         */
+        ret |= maybe_destroy_workers(gcwq);
+        ret |= maybe_create_worker(gcwq);
+
+        gcwq->flags &= ~GCWQ_MANAGING_WORKERS;
+
+        /*
+         * The trustee might be waiting to take over the manager
+         * position, tell it we're done.
+         */
+        if (unlikely(gcwq->trustee))
+                wake_up_all(&gcwq->trustee_wait);
+
+        return ret;
+}
+
+/**
+ * move_linked_works - move linked works to a list
+ * @work: start of series of works to be scheduled
+ * @head: target list to append @work to
+ * @nextp: out paramter for nested worklist walking
+ *
+ * Schedule linked works starting from @work to @head.  Work series to
+ * be scheduled starts at @work and includes any consecutive work with
+ * WORK_STRUCT_LINKED set in its predecessor.
+ *
+ * If @nextp is not NULL, it's updated to point to the next work of
+ * the last scheduled work.  This allows move_linked_works() to be
+ * nested inside outer list_for_each_entry_safe().
+ *
+ * CONTEXT:
+ * spin_lock_irq(gcwq->lock).
+ */
+static void move_linked_works(struct work_struct *work, struct list_head *head,
+                              struct work_struct **nextp)
+{
+        struct work_struct *n;
+
+        /*
+         * Linked worklist will always end before the end of the list,
+         * use NULL for list head.
+         */
+        list_for_each_entry_safe_from(work, n, NULL, entry) {
+                list_move_tail(&work->entry, head);
+                if (!(*work_data_bits(work) & WORK_STRUCT_LINKED))
+                        break;
+        }
+
+        /*
+         * If we're already inside safe list traversal and have moved
+         * multiple works to the scheduled queue, the next position
+         * needs to be updated.
+         */
+        if (nextp)
+                *nextp = n;
+}
+
+static void cwq_activate_first_delayed(struct cpu_workqueue_struct *cwq)
+{
+        struct work_struct *work = list_first_entry(&cwq->delayed_works,
+                                                    struct work_struct, entry);
+        struct list_head *pos = gcwq_determine_ins_pos(cwq->gcwq, cwq);
+
+        move_linked_works(work, pos, NULL);
+        cwq->nr_active++;
+}
+
+/**
+ * cwq_dec_nr_in_flight - decrement cwq's nr_in_flight
+ * @cwq: cwq of interest
+ * @color: color of work which left the queue
+ *
+ * A work either has completed or is removed from pending queue,
+ * decrement nr_in_flight of its cwq and handle workqueue flushing.
+ *
+ * CONTEXT:
+ * spin_lock_irq(gcwq->lock).
+ */
+static void cwq_dec_nr_in_flight(struct cpu_workqueue_struct *cwq, int color)
+{
+        /* ignore uncolored works */
+        if (color == WORK_NO_COLOR)
+                return;
+
+        cwq->nr_in_flight[color]--;
+        cwq->nr_active--;
+
+        if (!list_empty(&cwq->delayed_works)) {
+                /* one down, submit a delayed one */
+                if (cwq->nr_active < cwq->max_active)
+                        cwq_activate_first_delayed(cwq);
+        }
+
+        /* is flush in progress and are we at the flushing tip? */
+        if (likely(cwq->flush_color != color))
+                return;
+
+        /* are there still in-flight works? */
+        if (cwq->nr_in_flight[color])
+                return;
+
+        /* this cwq is done, clear flush_color */
+        cwq->flush_color = -1;
+
+        /*
+         * If this was the last cwq, wake up the first flusher.  It
+         * will handle the rest.
+         */
+        if (atomic_dec_and_test(&cwq->wq->nr_cwqs_to_flush))
+                complete(&cwq->wq->first_flusher->done);
+}
+
+/**
+ * process_one_work - process single work
+ * @worker: self
+ * @work: work to process
+ *
+ * Process @work.  This function contains all the logics necessary to
+ * process a single work including synchronization against and
+ * interaction with other workers on the same cpu, queueing and
+ * flushing.  As long as context requirement is met, any worker can
+ * call this function to process a work.
+ *
+ * CONTEXT:
+ * spin_lock_irq(gcwq->lock) which is released and regrabbed.
+ */
+static void process_one_work(struct worker *worker, struct work_struct *work)
+{
+        struct cpu_workqueue_struct *cwq = get_work_cwq(work);
+        struct global_cwq *gcwq = cwq->gcwq;
+        struct hlist_head *bwh = busy_worker_head(gcwq, work);
+        bool cpu_intensive = cwq->wq->flags & WQ_CPU_INTENSIVE;
+        work_func_t f = work->func;
+        int work_color;
+        struct worker *collision;
+#ifdef CONFIG_LOCKDEP
+        /*
+         * It is permissible to free the struct work_struct from
+         * inside the function that is called from it, this we need to
+         * take into account for lockdep too.  To avoid bogus "held
+         * lock freed" warnings as well as problems when looking into
+         * work->lockdep_map, make a copy and use that here.
+         */
+        struct lockdep_map lockdep_map = work->lockdep_map;
+#endif
+        /*
+         * A single work shouldn't be executed concurrently by
+         * multiple workers on a single cpu.  Check whether anyone is
+         * already processing the work.  If so, defer the work to the
+         * currently executing one.
+         */
+        collision = __find_worker_executing_work(gcwq, bwh, work);
+        if (unlikely(collision)) {
+                move_linked_works(work, &collision->scheduled, NULL);
+                return;
+        }
+
+        /* claim and process */
+        debug_work_deactivate(work);
+        hlist_add_head(&worker->hentry, bwh);
+        worker->current_work = work;
+        worker->current_cwq = cwq;
+        work_color = get_work_color(work);
+
+        /* record the current cpu number in the work data and dequeue */
+        set_work_cpu(work, gcwq->cpu);
+        list_del_init(&work->entry);
+
+        /*
+         * If HIGHPRI_PENDING, check the next work, and, if HIGHPRI,
+         * wake up another worker; otherwise, clear HIGHPRI_PENDING.
+         */
+        if (unlikely(gcwq->flags & GCWQ_HIGHPRI_PENDING)) {
+                struct work_struct *nwork = list_first_entry(&gcwq->worklist,
+                                                struct work_struct, entry);
+
+                if (!list_empty(&gcwq->worklist) &&
+                    get_work_cwq(nwork)->wq->flags & WQ_HIGHPRI)
+                        wake_up_worker(gcwq);
+                else
+                        gcwq->flags &= ~GCWQ_HIGHPRI_PENDING;
+        }
+
+        /*
+         * CPU intensive works don't participate in concurrency
+         * management.  They're the scheduler's responsibility.
+         */
+        if (unlikely(cpu_intensive))
+                worker_set_flags(worker, WORKER_CPU_INTENSIVE, true);
+
+        spin_unlock_irq(&gcwq->lock);
+
+        work_clear_pending(work);
+        lock_map_acquire(&cwq->wq->lockdep_map);
+        lock_map_acquire(&lockdep_map);
+        trace_workqueue_execute_start(work);
+        f(work);
+        /*
+         * While we must be careful to not use "work" after this, the trace
+         * point will only record its address.
+         */
+        trace_workqueue_execute_end(work);
+        lock_map_release(&lockdep_map);
+        lock_map_release(&cwq->wq->lockdep_map);
+
+        if (unlikely(in_atomic() || lockdep_depth(current) > 0)) {
+                printk(KERN_ERR "BUG: workqueue leaked lock or atomic: "
+                       "%s/0x%08x/%d\n",
+                       current->comm, preempt_count(), task_pid_nr(current));
+                printk(KERN_ERR "    last function: ");
+                print_symbol("%s\n", (unsigned long)f);
+                debug_show_held_locks(current);
+                dump_stack();
+        }
+
+        spin_lock_irq(&gcwq->lock);
+
+        /* clear cpu intensive status */
+        if (unlikely(cpu_intensive))
+                worker_clr_flags(worker, WORKER_CPU_INTENSIVE);
+
+        /* we're done with it, release */
+        hlist_del_init(&worker->hentry);
+        worker->current_work = NULL;
+        worker->current_cwq = NULL;
+        cwq_dec_nr_in_flight(cwq, work_color);
+}
+
+/**
+ * process_scheduled_works - process scheduled works
+ * @worker: self
+ *
+ * Process all scheduled works.  Please note that the scheduled list
+ * may change while processing a work, so this function repeatedly
+ * fetches a work from the top and executes it.
+ *
+ * CONTEXT:
+ * spin_lock_irq(gcwq->lock) which may be released and regrabbed
+ * multiple times.
+ */
+static void process_scheduled_works(struct worker *worker)
+{
+        while (!list_empty(&worker->scheduled)) {
+                struct work_struct *work = list_first_entry(&worker->scheduled,
+                                                struct work_struct, entry);
+                process_one_work(worker, work);
+        }
+}
+
+/**
+ * worker_thread - the worker thread function
+ * @__worker: self
+ *
+ * The gcwq worker thread function.  There's a single dynamic pool of
+ * these per each cpu.  These workers process all works regardless of
+ * their specific target workqueue.  The only exception is works which
+ * belong to workqueues with a rescuer which will be explained in
+ * rescuer_thread().
+ */
+static int worker_thread(void *__worker)
+{
+        struct worker *worker = __worker;
+        struct global_cwq *gcwq = worker->gcwq;
+
+        /* tell the scheduler that this is a workqueue worker */
+        worker->task->flags |= PF_WQ_WORKER;
+woke_up:
+        spin_lock_irq(&gcwq->lock);
+
+        /* DIE can be set only while we're idle, checking here is enough */
+        if (worker->flags & WORKER_DIE) {
+                spin_unlock_irq(&gcwq->lock);
+                worker->task->flags &= ~PF_WQ_WORKER;
+                return 0;
+        }
+
+        worker_leave_idle(worker);
+recheck:
+        /* no more worker necessary? */
+        if (!need_more_worker(gcwq))
+                goto sleep;
+
+        /* do we need to manage? */
+        if (unlikely(!may_start_working(gcwq)) && manage_workers(worker))
+                goto recheck;
+
+        /*
+         * ->scheduled list can only be filled while a worker is
+         * preparing to process a work or actually processing it.
+         * Make sure nobody diddled with it while I was sleeping.
+         */
+        BUG_ON(!list_empty(&worker->scheduled));
+
+        /*
+         * When control reaches this point, we're guaranteed to have
+         * at least one idle worker or that someone else has already
+         * assumed the manager role.
+         */
+        worker_clr_flags(worker, WORKER_PREP);
+
+        do {
+                struct work_struct *work =
+                        list_first_entry(&gcwq->worklist,
+                                         struct work_struct, entry);
+
+                if (likely(!(*work_data_bits(work) & WORK_STRUCT_LINKED))) {
+                        /* optimization path, not strictly necessary */
+                        process_one_work(worker, work);
+                        if (unlikely(!list_empty(&worker->scheduled)))
+                                process_scheduled_works(worker);
+                } else {
+                        move_linked_works(work, &worker->scheduled, NULL);
+                        process_scheduled_works(worker);
+                }
+        } while (keep_working(gcwq));
+
+        worker_set_flags(worker, WORKER_PREP, false);
+sleep:
+        if (unlikely(need_to_manage_workers(gcwq)) && manage_workers(worker))
+                goto recheck;
+
+        /*
+         * gcwq->lock is held and there's no work to process and no
+         * need to manage, sleep.  Workers are woken up only while
+         * holding gcwq->lock or from local cpu, so setting the
+         * current state before releasing gcwq->lock is enough to
+         * prevent losing any event.
+         */
+        worker_enter_idle(worker);
+        __set_current_state(TASK_INTERRUPTIBLE);
+        spin_unlock_irq(&gcwq->lock);
+        schedule();
+        goto woke_up;
+}
+
+/**
+ * rescuer_thread - the rescuer thread function
+ * @__wq: the associated workqueue
+ *
+ * Workqueue rescuer thread function.  There's one rescuer for each
+ * workqueue which has WQ_RESCUER set.
+ *
+ * Regular work processing on a gcwq may block trying to create a new
+ * worker which uses GFP_KERNEL allocation which has slight chance of
+ * developing into deadlock if some works currently on the same queue
+ * need to be processed to satisfy the GFP_KERNEL allocation.  This is
+ * the problem rescuer solves.
+ *
+ * When such condition is possible, the gcwq summons rescuers of all
+ * workqueues which have works queued on the gcwq and let them process
+ * those works so that forward progress can be guaranteed.
+ *
+ * This should happen rarely.
+ */
+static int rescuer_thread(void *__wq)
+{
+        struct workqueue_struct *wq = __wq;
+        struct worker *rescuer = wq->rescuer;
+        struct list_head *scheduled = &rescuer->scheduled;
+        bool is_unbound = wq->flags & WQ_UNBOUND;
+        unsigned int cpu;
+
+        set_user_nice(current, RESCUER_NICE_LEVEL);
+repeat:
+        set_current_state(TASK_INTERRUPTIBLE);
+
+        if (kthread_should_stop())
+                return 0;
+
+        /*
+         * See whether any cpu is asking for help.  Unbounded
+         * workqueues use cpu 0 in mayday_mask for CPU_UNBOUND.
+         */
+        for_each_mayday_cpu(cpu, wq->mayday_mask) {
+                unsigned int tcpu = is_unbound ? WORK_CPU_UNBOUND : cpu;
+                struct cpu_workqueue_struct *cwq = get_cwq(tcpu, wq);
+                struct global_cwq *gcwq = cwq->gcwq;
+                struct work_struct *work, *n;
+
+                __set_current_state(TASK_RUNNING);
+                mayday_clear_cpu(cpu, wq->mayday_mask);
+
+                /* migrate to the target cpu if possible */
+                rescuer->gcwq = gcwq;
+                worker_maybe_bind_and_lock(rescuer);
+
+                /*
+                 * Slurp in all works issued via this workqueue and
+                 * process'em.
+                 */
+                BUG_ON(!list_empty(&rescuer->scheduled));
+                list_for_each_entry_safe(work, n, &gcwq->worklist, entry)
+                        if (get_work_cwq(work) == cwq)
+                                move_linked_works(work, scheduled, &n);
+
+                process_scheduled_works(rescuer);
+                spin_unlock_irq(&gcwq->lock);
+        }
+
+        schedule();
+        goto repeat;
 }
 
 struct wq_barrier {
@@ -469,44 +2012,137 @@ static void wq_barrier_func(struct work_struct *work)
         complete(&barr->done);
 }
 
+/**
+ * insert_wq_barrier - insert a barrier work
+ * @cwq: cwq to insert barrier into
+ * @barr: wq_barrier to insert
+ * @target: target work to attach @barr to
+ * @worker: worker currently executing @target, NULL if @target is not executing
+ *
+ * @barr is linked to @target such that @barr is completed only after
+ * @target finishes execution.  Please note that the ordering
+ * guarantee is observed only with respect to @target and on the local
+ * cpu.
+ *
+ * Currently, a queued barrier can't be canceled.  This is because
+ * try_to_grab_pending() can't determine whether the work to be
+ * grabbed is at the head of the queue and thus can't clear LINKED
+ * flag of the previous work while there must be a valid next work
+ * after a work with LINKED flag set.
+ *
+ * Note that when @worker is non-NULL, @target may be modified
+ * underneath us, so we can't reliably determine cwq from @target.
+ *
+ * CONTEXT:
+ * spin_lock_irq(gcwq->lock).
+ */
 static void insert_wq_barrier(struct cpu_workqueue_struct *cwq,
-                        struct wq_barrier *barr, struct list_head *head)
+                              struct wq_barrier *barr,
+                              struct work_struct *target, struct worker *worker)
 {
+        struct list_head *head;
+        unsigned int linked = 0;
+
         /*
-         * debugobject calls are safe here even with cwq->lock locked
+         * debugobject calls are safe here even with gcwq->lock locked
          * as we know for sure that this will not trigger any of the
          * checks and call back into the fixup functions where we
          * might deadlock.
          */
         INIT_WORK_ON_STACK(&barr->work, wq_barrier_func);
-        __set_bit(WORK_STRUCT_PENDING, work_data_bits(&barr->work));
-
+        __set_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(&barr->work));
         init_completion(&barr->done);
 
+        /*
+         * If @target is currently being executed, schedule the
+         * barrier to the worker; otherwise, put it after @target.
+         */
+        if (worker)
+                head = worker->scheduled.next;
+        else {
+                unsigned long *bits = work_data_bits(target);
+
+                head = target->entry.next;
+                /* there can already be other linked works, inherit and set */
+                linked = *bits & WORK_STRUCT_LINKED;
+                __set_bit(WORK_STRUCT_LINKED_BIT, bits);
+        }
+
         debug_work_activate(&barr->work);
-        insert_work(cwq, &barr->work, head);
+        insert_work(cwq, &barr->work, head,
+                    work_color_to_flags(WORK_NO_COLOR) | linked);
 }
 
-static int flush_cpu_workqueue(struct cpu_workqueue_struct *cwq)
+/**
+ * flush_workqueue_prep_cwqs - prepare cwqs for workqueue flushing
+ * @wq: workqueue being flushed
+ * @flush_color: new flush color, < 0 for no-op
+ * @work_color: new work color, < 0 for no-op
+ *
+ * Prepare cwqs for workqueue flushing.
+ *
+ * If @flush_color is non-negative, flush_color on all cwqs should be
+ * -1.  If no cwq has in-flight commands at the specified color, all
+ * cwq->flush_color's stay at -1 and %false is returned.  If any cwq
+ * has in flight commands, its cwq->flush_color is set to
+ * @flush_color, @wq->nr_cwqs_to_flush is updated accordingly, cwq
+ * wakeup logic is armed and %true is returned.
+ *
+ * The caller should have initialized @wq->first_flusher prior to
+ * calling this function with non-negative @flush_color.  If
+ * @flush_color is negative, no flush color update is done and %false
+ * is returned.
+ *
+ * If @work_color is non-negative, all cwqs should have the same
+ * work_color which is previous to @work_color and all will be
+ * advanced to @work_color.
+ *
+ * CONTEXT:
+ * mutex_lock(wq->flush_mutex).
+ *
+ * RETURNS:
+ * %true if @flush_color >= 0 and there's something to flush.  %false
+ * otherwise.
+ */
+static bool flush_workqueue_prep_cwqs(struct workqueue_struct *wq,
+                                      int flush_color, int work_color)
 {
-        int active = 0;
-        struct wq_barrier barr;
-
-        WARN_ON(cwq->thread == current);
+        bool wait = false;
+        unsigned int cpu;
 
-        spin_lock_irq(&cwq->lock);
-        if (!list_empty(&cwq->worklist) || cwq->current_work != NULL) {
-                insert_wq_barrier(cwq, &barr, &cwq->worklist);
-                active = 1;
+        if (flush_color >= 0) {
+                BUG_ON(atomic_read(&wq->nr_cwqs_to_flush));
+                atomic_set(&wq->nr_cwqs_to_flush, 1);
         }
-        spin_unlock_irq(&cwq->lock);
 
-        if (active) {
-                wait_for_completion(&barr.done);
-                destroy_work_on_stack(&barr.work);
+        for_each_cwq_cpu(cpu, wq) {
+                struct cpu_workqueue_struct *cwq = get_cwq(cpu, wq);
+                struct global_cwq *gcwq = cwq->gcwq;
+
+                spin_lock_irq(&gcwq->lock);
+
+                if (flush_color >= 0) {
+                        BUG_ON(cwq->flush_color != -1);
+
+                        if (cwq->nr_in_flight[flush_color]) {
+                                cwq->flush_color = flush_color;
+                                atomic_inc(&wq->nr_cwqs_to_flush);
+                                wait = true;
+                        }
+                }
+
+                if (work_color >= 0) {
+                        BUG_ON(work_color != work_next_color(cwq->work_color));
+                        cwq->work_color = work_color;
+                }
+
+                spin_unlock_irq(&gcwq->lock);
         }
 
-        return active;
+        if (flush_color >= 0 && atomic_dec_and_test(&wq->nr_cwqs_to_flush))
+                complete(&wq->first_flusher->done);
+
+        return wait;
 }
 
 /**
@@ -518,20 +2154,150 @@ static int flush_cpu_workqueue(struct cpu_workqueue_struct *cwq)
  *
  * We sleep until all works which were queued on entry have been handled,
  * but we are not livelocked by new incoming ones.
- *
- * This function used to run the workqueues itself.  Now we just wait for the
- * helper threads to do it.
  */
 void flush_workqueue(struct workqueue_struct *wq)
 {
-        const struct cpumask *cpu_map = wq_cpu_map(wq);
-        int cpu;
+        struct wq_flusher this_flusher = {
+                .list = LIST_HEAD_INIT(this_flusher.list),
+                .flush_color = -1,
+                .done = COMPLETION_INITIALIZER_ONSTACK(this_flusher.done),
+        };
+        int next_color;
 
-        might_sleep();
         lock_map_acquire(&wq->lockdep_map);
         lock_map_release(&wq->lockdep_map);
-        for_each_cpu(cpu, cpu_map)
-                flush_cpu_workqueue(per_cpu_ptr(wq->cpu_wq, cpu));
+
+        mutex_lock(&wq->flush_mutex);
+
+        /*
+         * Start-to-wait phase
+         */
+        next_color = work_next_color(wq->work_color);
+
+        if (next_color != wq->flush_color) {
+                /*
+                 * Color space is not full.  The current work_color
+                 * becomes our flush_color and work_color is advanced
+                 * by one.
+                 */
+                BUG_ON(!list_empty(&wq->flusher_overflow));
+                this_flusher.flush_color = wq->work_color;
+                wq->work_color = next_color;
+
+                if (!wq->first_flusher) {
+                        /* no flush in progress, become the first flusher */
+                        BUG_ON(wq->flush_color != this_flusher.flush_color);
+
+                        wq->first_flusher = &this_flusher;
+
+                        if (!flush_workqueue_prep_cwqs(wq, wq->flush_color,
+                                                       wq->work_color)) {
+                                /* nothing to flush, done */
+                                wq->flush_color = next_color;
+                                wq->first_flusher = NULL;
+                                goto out_unlock;
+                        }
+                } else {
+                        /* wait in queue */
+                        BUG_ON(wq->flush_color == this_flusher.flush_color);
+                        list_add_tail(&this_flusher.list, &wq->flusher_queue);
+                        flush_workqueue_prep_cwqs(wq, -1, wq->work_color);
+                }
+        } else {
+                /*
+                 * Oops, color space is full, wait on overflow queue.
+                 * The next flush completion will assign us
+                 * flush_color and transfer to flusher_queue.
+                 */
+                list_add_tail(&this_flusher.list, &wq->flusher_overflow);
+        }
+
+        mutex_unlock(&wq->flush_mutex);
+
+        wait_for_completion(&this_flusher.done);
+
+        /*
+         * Wake-up-and-cascade phase
+         *
+         * First flushers are responsible for cascading flushes and
+         * handling overflow.  Non-first flushers can simply return.
+         */
+        if (wq->first_flusher != &this_flusher)
+                return;
+
+        mutex_lock(&wq->flush_mutex);
+
+        /* we might have raced, check again with mutex held */
+        if (wq->first_flusher != &this_flusher)
+                goto out_unlock;
+
+        wq->first_flusher = NULL;
+
+        BUG_ON(!list_empty(&this_flusher.list));
+        BUG_ON(wq->flush_color != this_flusher.flush_color);
+
+        while (true) {
+                struct wq_flusher *next, *tmp;
+
+                /* complete all the flushers sharing the current flush color */
+                list_for_each_entry_safe(next, tmp, &wq->flusher_queue, list) {
+                        if (next->flush_color != wq->flush_color)
+                                break;
+                        list_del_init(&next->list);
+                        complete(&next->done);
+                }
+
+                BUG_ON(!list_empty(&wq->flusher_overflow) &&
+                       wq->flush_color != work_next_color(wq->work_color));
+
+                /* this flush_color is finished, advance by one */
+                wq->flush_color = work_next_color(wq->flush_color);
+
+                /* one color has been freed, handle overflow queue */
+                if (!list_empty(&wq->flusher_overflow)) {
+                        /*
+                         * Assign the same color to all overflowed
+                         * flushers, advance work_color and append to
+                         * flusher_queue.  This is the start-to-wait
+                         * phase for these overflowed flushers.
+                         */
+                        list_for_each_entry(tmp, &wq->flusher_overflow, list)
+                                tmp->flush_color = wq->work_color;
+
+                        wq->work_color = work_next_color(wq->work_color);
+
+                        list_splice_tail_init(&wq->flusher_overflow,
+                                              &wq->flusher_queue);
+                        flush_workqueue_prep_cwqs(wq, -1, wq->work_color);
+                }
+
+                if (list_empty(&wq->flusher_queue)) {
+                        BUG_ON(wq->flush_color != wq->work_color);
+                        break;
+                }
+
+                /*
+                 * Need to flush more colors.  Make the next flusher
+                 * the new first flusher and arm cwqs.
+                 */
+                BUG_ON(wq->flush_color == wq->work_color);
+                BUG_ON(wq->flush_color != next->flush_color);
+
+                list_del_init(&next->list);
+                wq->first_flusher = next;
+
+                if (flush_workqueue_prep_cwqs(wq, wq->flush_color, -1))
+                        break;
+
+                /*
+                 * Meh... this color is already done, clear first
+                 * flusher and repeat cascading.
+                 */
+                wq->first_flusher = NULL;
+        }
+
+out_unlock:
+        mutex_unlock(&wq->flush_mutex);
 }
 EXPORT_SYMBOL_GPL(flush_workqueue);
 
@@ -547,43 +2313,46 @@ EXPORT_SYMBOL_GPL(flush_workqueue);
  */
 int flush_work(struct work_struct *work)
 {
+        struct worker *worker = NULL;
+        struct global_cwq *gcwq;
         struct cpu_workqueue_struct *cwq;
-        struct list_head *prev;
         struct wq_barrier barr;
 
         might_sleep();
-        cwq = get_wq_data(work);
-        if (!cwq)
+        gcwq = get_work_gcwq(work);
+        if (!gcwq)
                 return 0;
 
-        lock_map_acquire(&cwq->wq->lockdep_map);
-        lock_map_release(&cwq->wq->lockdep_map);
-
-        prev = NULL;
-        spin_lock_irq(&cwq->lock);
+        spin_lock_irq(&gcwq->lock);
         if (!list_empty(&work->entry)) {
                 /*
                  * See the comment near try_to_grab_pending()->smp_rmb().
-                 * If it was re-queued under us we are not going to wait.
+                 * If it was re-queued to a different gcwq under us, we
+                 * are not going to wait.
                  */
                 smp_rmb();
-                if (unlikely(cwq != get_wq_data(work)))
-                        goto out;
-                prev = &work->entry;
+                cwq = get_work_cwq(work);
+                if (unlikely(!cwq || gcwq != cwq->gcwq))
+                        goto already_gone;
         } else {
-                if (cwq->current_work != work)
-                        goto out;
-                prev = &cwq->worklist;
+                worker = find_worker_executing_work(gcwq, work);
+                if (!worker)
+                        goto already_gone;
+                cwq = worker->current_cwq;
         }
-        insert_wq_barrier(cwq, &barr, prev->next);
-out:
-        spin_unlock_irq(&cwq->lock);
-        if (!prev)
-                return 0;
+
+        insert_wq_barrier(cwq, &barr, work, worker);
+        spin_unlock_irq(&gcwq->lock);
+
+        lock_map_acquire(&cwq->wq->lockdep_map);
+        lock_map_release(&cwq->wq->lockdep_map);
 
         wait_for_completion(&barr.done);
         destroy_work_on_stack(&barr.work);
         return 1;
+already_gone:
+        spin_unlock_irq(&gcwq->lock);
+        return 0;
 }
 EXPORT_SYMBOL_GPL(flush_work);
 
@@ -593,54 +2362,55 @@ EXPORT_SYMBOL_GPL(flush_work);
  */
 static int try_to_grab_pending(struct work_struct *work)
 {
-        struct cpu_workqueue_struct *cwq;
+        struct global_cwq *gcwq;
         int ret = -1;
 
-        if (!test_and_set_bit(WORK_STRUCT_PENDING, work_data_bits(work)))
+        if (!test_and_set_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(work)))
                 return 0;
 
         /*
          * The queueing is in progress, or it is already queued. Try to
          * steal it from ->worklist without clearing WORK_STRUCT_PENDING.
          */
-
-        cwq = get_wq_data(work);
-        if (!cwq)
+        gcwq = get_work_gcwq(work);
+        if (!gcwq)
                 return ret;
 
-        spin_lock_irq(&cwq->lock);
+        spin_lock_irq(&gcwq->lock);
         if (!list_empty(&work->entry)) {
                 /*
-                 * This work is queued, but perhaps we locked the wrong cwq.
+                 * This work is queued, but perhaps we locked the wrong gcwq.
                  * In that case we must see the new value after rmb(), see
                  * insert_work()->wmb().
                  */
                 smp_rmb();
-                if (cwq == get_wq_data(work)) {
+                if (gcwq == get_work_gcwq(work)) {
                         debug_work_deactivate(work);
                         list_del_init(&work->entry);
+                        cwq_dec_nr_in_flight(get_work_cwq(work),
+                                             get_work_color(work));
                         ret = 1;
                 }
         }
-        spin_unlock_irq(&cwq->lock);
+        spin_unlock_irq(&gcwq->lock);
 
         return ret;
 }
 
-static void wait_on_cpu_work(struct cpu_workqueue_struct *cwq,
-                                struct work_struct *work)
+static void wait_on_cpu_work(struct global_cwq *gcwq, struct work_struct *work)
 {
         struct wq_barrier barr;
-        int running = 0;
+        struct worker *worker;
 
-        spin_lock_irq(&cwq->lock);
-        if (unlikely(cwq->current_work == work)) {
-                insert_wq_barrier(cwq, &barr, cwq->worklist.next);
-                running = 1;
-        }
-        spin_unlock_irq(&cwq->lock);
+        spin_lock_irq(&gcwq->lock);
 
-        if (unlikely(running)) {
+        worker = find_worker_executing_work(gcwq, work);
+        if (unlikely(worker))
+                insert_wq_barrier(worker->current_cwq, &barr, work, worker);
+
+        spin_unlock_irq(&gcwq->lock);
+
+        if (unlikely(worker)) {
                 wait_for_completion(&barr.done);
                 destroy_work_on_stack(&barr.work);
         }
@@ -648,9 +2418,6 @@ static void wait_on_cpu_work(struct cpu_workqueue_struct *cwq,
 
 static void wait_on_work(struct work_struct *work)
 {
-        struct cpu_workqueue_struct *cwq;
-        struct workqueue_struct *wq;
-        const struct cpumask *cpu_map;
         int cpu;
 
         might_sleep();
@@ -658,15 +2425,8 @@ static void wait_on_work(struct work_struct *work)
         lock_map_acquire(&work->lockdep_map);
         lock_map_release(&work->lockdep_map);
 
-        cwq = get_wq_data(work);
-        if (!cwq)
-                return;
-
-        wq = cwq->wq;
-        cpu_map = wq_cpu_map(wq);
-
-        for_each_cpu(cpu, cpu_map)
-                wait_on_cpu_work(per_cpu_ptr(wq->cpu_wq, cpu), work);
+        for_each_gcwq_cpu(cpu)
+                wait_on_cpu_work(get_gcwq(cpu), work);
 }
 
 static int __cancel_work_timer(struct work_struct *work,
@@ -681,7 +2441,7 @@ static int __cancel_work_timer(struct work_struct *work,
                 wait_on_work(work);
         } while (unlikely(ret < 0));
 
-        clear_wq_data(work);
+        clear_work_data(work);
         return ret;
 }
 
@@ -727,8 +2487,6 @@ int cancel_delayed_work_sync(struct delayed_work *dwork)
 }
 EXPORT_SYMBOL(cancel_delayed_work_sync);
 
-static struct workqueue_struct *keventd_wq __read_mostly;
-
 /**
  * schedule_work - put work task in global workqueue
  * @work: job to be done
@@ -742,7 +2500,7 @@ static struct workqueue_struct *keventd_wq __read_mostly;
  */
 int schedule_work(struct work_struct *work)
 {
-        return queue_work(keventd_wq, work);
+        return queue_work(system_wq, work);
 }
 EXPORT_SYMBOL(schedule_work);
 
@@ -755,7 +2513,7 @@ EXPORT_SYMBOL(schedule_work);
  */
 int schedule_work_on(int cpu, struct work_struct *work)
 {
-        return queue_work_on(cpu, keventd_wq, work);
+        return queue_work_on(cpu, system_wq, work);
 }
 EXPORT_SYMBOL(schedule_work_on);
 
@@ -770,7 +2528,7 @@ EXPORT_SYMBOL(schedule_work_on);
 int schedule_delayed_work(struct delayed_work *dwork,
                                         unsigned long delay)
 {
-        return queue_delayed_work(keventd_wq, dwork, delay);
+        return queue_delayed_work(system_wq, dwork, delay);
 }
 EXPORT_SYMBOL(schedule_delayed_work);
 
@@ -783,9 +2541,8 @@ EXPORT_SYMBOL(schedule_delayed_work);
 void flush_delayed_work(struct delayed_work *dwork)
 {
         if (del_timer_sync(&dwork->timer)) {
-                struct cpu_workqueue_struct *cwq;
-                cwq = wq_per_cpu(get_wq_data(&dwork->work)->wq, get_cpu());
-                __queue_work(cwq, &dwork->work);
+                __queue_work(get_cpu(), get_work_cwq(&dwork->work)->wq,
+                             &dwork->work);
                 put_cpu();
         }
         flush_work(&dwork->work);
@@ -804,7 +2561,7 @@ EXPORT_SYMBOL(flush_delayed_work);
 int schedule_delayed_work_on(int cpu,
                         struct delayed_work *dwork, unsigned long delay)
 {
-        return queue_delayed_work_on(cpu, keventd_wq, dwork, delay);
+        return queue_delayed_work_on(cpu, system_wq, dwork, delay);
 }
 EXPORT_SYMBOL(schedule_delayed_work_on);
 
@@ -820,8 +2577,7 @@ EXPORT_SYMBOL(schedule_delayed_work_on);
 int schedule_on_each_cpu(work_func_t func)
 {
         int cpu;
-        int orig = -1;
-        struct work_struct *works;
+        struct work_struct __percpu *works;
 
         works = alloc_percpu(struct work_struct);
         if (!works)
@@ -829,23 +2585,12 @@ int schedule_on_each_cpu(work_func_t func)
 
         get_online_cpus();
 
-        /*
-         * When running in keventd don't schedule a work item on
-         * itself.  Can just call directly because the work queue is
-         * already bound.  This also is faster.
-         */
-        if (current_is_keventd())
-                orig = raw_smp_processor_id();
-
         for_each_online_cpu(cpu) {
                 struct work_struct *work = per_cpu_ptr(works, cpu);
 
                 INIT_WORK(work, func);
-                if (cpu != orig)
-                        schedule_work_on(cpu, work);
+                schedule_work_on(cpu, work);
         }
-        if (orig >= 0)
-                func(per_cpu_ptr(works, orig));
 
         for_each_online_cpu(cpu)
                 flush_work(per_cpu_ptr(works, cpu));
@@ -881,7 +2626,7 @@ int schedule_on_each_cpu(work_func_t func)
  */
 void flush_scheduled_work(void)
 {
-        flush_workqueue(keventd_wq);
+        flush_workqueue(system_wq);
 }
 EXPORT_SYMBOL(flush_scheduled_work);
 
@@ -913,170 +2658,170 @@ EXPORT_SYMBOL_GPL(execute_in_process_context);
 
 int keventd_up(void)
 {
-        return keventd_wq != NULL;
+        return system_wq != NULL;
 }
 
-int current_is_keventd(void)
+static int alloc_cwqs(struct workqueue_struct *wq)
 {
-        struct cpu_workqueue_struct *cwq;
-        int cpu = raw_smp_processor_id(); /* preempt-safe: keventd is per-cpu */
-        int ret = 0;
-
-        BUG_ON(!keventd_wq);
+        /*
+         * cwqs are forced aligned according to WORK_STRUCT_FLAG_BITS.
+         * Make sure that the alignment isn't lower than that of
+         * unsigned long long.
+         */
+        const size_t size = sizeof(struct cpu_workqueue_struct);
+        const size_t align = max_t(size_t, 1 << WORK_STRUCT_FLAG_BITS,
+                                   __alignof__(unsigned long long));
+#ifdef CONFIG_SMP
+        bool percpu = !(wq->flags & WQ_UNBOUND);
+#else
+        bool percpu = false;
+#endif
 
-        cwq = per_cpu_ptr(keventd_wq->cpu_wq, cpu);
-        if (current == cwq->thread)
-                ret = 1;
+        if (percpu)
+                wq->cpu_wq.pcpu = __alloc_percpu(size, align);
+        else {
+                void *ptr;
 
-        return ret;
+                /*
+                 * Allocate enough room to align cwq and put an extra
+                 * pointer at the end pointing back to the originally
+                 * allocated pointer which will be used for free.
+                 */
+                ptr = kzalloc(size + align + sizeof(void *), GFP_KERNEL);
+                if (ptr) {
+                        wq->cpu_wq.single = PTR_ALIGN(ptr, align);
+                        *(void **)(wq->cpu_wq.single + 1) = ptr;
+                }
+        }
 
+        /* just in case, make sure it's actually aligned */
+        BUG_ON(!IS_ALIGNED(wq->cpu_wq.v, align));
+        return wq->cpu_wq.v ? 0 : -ENOMEM;
 }
 
-static struct cpu_workqueue_struct *
-init_cpu_workqueue(struct workqueue_struct *wq, int cpu)
+static void free_cwqs(struct workqueue_struct *wq)
 {
-        struct cpu_workqueue_struct *cwq = per_cpu_ptr(wq->cpu_wq, cpu);
-
-        cwq->wq = wq;
-        spin_lock_init(&cwq->lock);
-        INIT_LIST_HEAD(&cwq->worklist);
-        init_waitqueue_head(&cwq->more_work);
+#ifdef CONFIG_SMP
+        bool percpu = !(wq->flags & WQ_UNBOUND);
+#else
+        bool percpu = false;
+#endif
 
-        return cwq;
+        if (percpu)
+                free_percpu(wq->cpu_wq.pcpu);
+        else if (wq->cpu_wq.single) {
+                /* the pointer to free is stored right after the cwq */
+                kfree(*(void **)(wq->cpu_wq.single + 1));
+        }
 }
 
-static int create_workqueue_thread(struct cpu_workqueue_struct *cwq, int cpu)
+static int wq_clamp_max_active(int max_active, unsigned int flags,
+                               const char *name)
 {
-        struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 };
-        struct workqueue_struct *wq = cwq->wq;
-        const char *fmt = is_wq_single_threaded(wq) ? "%s" : "%s/%d";
-        struct task_struct *p;
+        int lim = flags & WQ_UNBOUND ? WQ_UNBOUND_MAX_ACTIVE : WQ_MAX_ACTIVE;
 
-        p = kthread_create(worker_thread, cwq, fmt, wq->name, cpu);
-        /*
-         * Nobody can add the work_struct to this cwq,
-         *      if (caller is __create_workqueue)
-         *              nobody should see this wq
-         *      else // caller is CPU_UP_PREPARE
-         *              cpu is not on cpu_online_map
-         * so we can abort safely.
-         */
-        if (IS_ERR(p))
-                return PTR_ERR(p);
-        if (cwq->wq->rt)
-                sched_setscheduler_nocheck(p, SCHED_FIFO, &param);
-        cwq->thread = p;
-
-        trace_workqueue_creation(cwq->thread, cpu);
+        if (max_active < 1 || max_active > lim)
+                printk(KERN_WARNING "workqueue: max_active %d requested for %s "
+                       "is out of range, clamping between %d and %d\n",
+                       max_active, name, 1, lim);
 
-        return 0;
+        return clamp_val(max_active, 1, lim);
 }
 
-static void start_workqueue_thread(struct cpu_workqueue_struct *cwq, int cpu)
+struct workqueue_struct *__alloc_workqueue_key(const char *name,
+                                               unsigned int flags,
+                                               int max_active,
+                                               struct lock_class_key *key,
+                                               const char *lock_name)
 {
-        struct task_struct *p = cwq->thread;
+        struct workqueue_struct *wq;
+        unsigned int cpu;
 
-        if (p != NULL) {
-                if (cpu >= 0)
-                        kthread_bind(p, cpu);
-                wake_up_process(p);
-        }
-}
+        /*
+         * Unbound workqueues aren't concurrency managed and should be
+         * dispatched to workers immediately.
+         */
+        if (flags & WQ_UNBOUND)
+                flags |= WQ_HIGHPRI;
 
-struct workqueue_struct *__create_workqueue_key(const char *name,
-                                                int singlethread,
-                                                int freezeable,
-                                                int rt,
-                                                struct lock_class_key *key,
-                                                const char *lock_name)
-{
-        struct workqueue_struct *wq;
-        struct cpu_workqueue_struct *cwq;
-        int err = 0, cpu;
+        max_active = max_active ?: WQ_DFL_ACTIVE;
+        max_active = wq_clamp_max_active(max_active, flags, name);
 
         wq = kzalloc(sizeof(*wq), GFP_KERNEL);
         if (!wq)
-                return NULL;
+                goto err;
 
-        wq->cpu_wq = alloc_percpu(struct cpu_workqueue_struct);
-        if (!wq->cpu_wq) {
-                kfree(wq);
-                return NULL;
-        }
+        wq->flags = flags;
+        wq->saved_max_active = max_active;
+        mutex_init(&wq->flush_mutex);
+        atomic_set(&wq->nr_cwqs_to_flush, 0);
+        INIT_LIST_HEAD(&wq->flusher_queue);
+        INIT_LIST_HEAD(&wq->flusher_overflow);
 
         wq->name = name;
         lockdep_init_map(&wq->lockdep_map, lock_name, key, 0);
-        wq->singlethread = singlethread;
-        wq->freezeable = freezeable;
-        wq->rt = rt;
         INIT_LIST_HEAD(&wq->list);
 
-        if (singlethread) {
-                cwq = init_cpu_workqueue(wq, singlethread_cpu);
-                err = create_workqueue_thread(cwq, singlethread_cpu);
-                start_workqueue_thread(cwq, -1);
-        } else {
-                cpu_maps_update_begin();
-                /*
-                 * We must place this wq on list even if the code below fails.
-                 * cpu_down(cpu) can remove cpu from cpu_populated_map before
-                 * destroy_workqueue() takes the lock, in that case we leak
-                 * cwq[cpu]->thread.
-                 */
-                spin_lock(&workqueue_lock);
-                list_add(&wq->list, &workqueues);
-                spin_unlock(&workqueue_lock);
-                /*
-                 * We must initialize cwqs for each possible cpu even if we
-                 * are going to call destroy_workqueue() finally. Otherwise
-                 * cpu_up() can hit the uninitialized cwq once we drop the
-                 * lock.
-                 */
-                for_each_possible_cpu(cpu) {
-                        cwq = init_cpu_workqueue(wq, cpu);
-                        if (err || !cpu_online(cpu))
-                                continue;
-                        err = create_workqueue_thread(cwq, cpu);
-                        start_workqueue_thread(cwq, cpu);
-                }
-                cpu_maps_update_done();
+        if (alloc_cwqs(wq) < 0)
+                goto err;
+
+        for_each_cwq_cpu(cpu, wq) {
+                struct cpu_workqueue_struct *cwq = get_cwq(cpu, wq);
+                struct global_cwq *gcwq = get_gcwq(cpu);
+
+                BUG_ON((unsigned long)cwq & WORK_STRUCT_FLAG_MASK);
+                cwq->gcwq = gcwq;
+                cwq->wq = wq;
+                cwq->flush_color = -1;
+                cwq->max_active = max_active;
+                INIT_LIST_HEAD(&cwq->delayed_works);
         }
 
-        if (err) {
-                destroy_workqueue(wq);
-                wq = NULL;
+        if (flags & WQ_RESCUER) {
+                struct worker *rescuer;
+
+                if (!alloc_mayday_mask(&wq->mayday_mask, GFP_KERNEL))
+                        goto err;
+
+                wq->rescuer = rescuer = alloc_worker();
+                if (!rescuer)
+                        goto err;
+
+                rescuer->task = kthread_create(rescuer_thread, wq, "%s", name);
+                if (IS_ERR(rescuer->task))
+                        goto err;
+
+                wq->rescuer = rescuer;
+                rescuer->task->flags |= PF_THREAD_BOUND;
+                wake_up_process(rescuer->task);
         }
-        return wq;
-}
-EXPORT_SYMBOL_GPL(__create_workqueue_key);
 
-static void cleanup_workqueue_thread(struct cpu_workqueue_struct *cwq)
-{
         /*
-         * Our caller is either destroy_workqueue() or CPU_POST_DEAD,
-         * cpu_add_remove_lock protects cwq->thread.
+         * workqueue_lock protects global freeze state and workqueues
+         * list.  Grab it, set max_active accordingly and add the new
+         * workqueue to workqueues list.
          */
-        if (cwq->thread == NULL)
-                return;
+        spin_lock(&workqueue_lock);
 
-        lock_map_acquire(&cwq->wq->lockdep_map);
-        lock_map_release(&cwq->wq->lockdep_map);
+        if (workqueue_freezing && wq->flags & WQ_FREEZEABLE)
+                for_each_cwq_cpu(cpu, wq)
+                        get_cwq(cpu, wq)->max_active = 0;
 
-        flush_cpu_workqueue(cwq);
-        /*
-         * If the caller is CPU_POST_DEAD and cwq->worklist was not empty,
-         * a concurrent flush_workqueue() can insert a barrier after us.
-         * However, in that case run_workqueue() won't return and check
-         * kthread_should_stop() until it flushes all work_struct's.
-         * When ->worklist becomes empty it is safe to exit because no
-         * more work_structs can be queued on this cwq: flush_workqueue
-         * checks list_empty(), and a "normal" queue_work() can't use
-         * a dead CPU.
-         */
-        trace_workqueue_destruction(cwq->thread);
-        kthread_stop(cwq->thread);
-        cwq->thread = NULL;
+        list_add(&wq->list, &workqueues);
+
+        spin_unlock(&workqueue_lock);
+
+        return wq;
+err:
+        if (wq) {
+                free_cwqs(wq);
+                free_mayday_mask(wq->mayday_mask);
+                kfree(wq->rescuer);
+                kfree(wq);
+        }
+        return NULL;
 }
+EXPORT_SYMBOL_GPL(__alloc_workqueue_key);
 
 /**
  * destroy_workqueue - safely terminate a workqueue
@@ -1086,72 +2831,516 @@ static void cleanup_workqueue_thread(struct cpu_workqueue_struct *cwq)
  */
 void destroy_workqueue(struct workqueue_struct *wq)
 {
-        const struct cpumask *cpu_map = wq_cpu_map(wq);
-        int cpu;
+        unsigned int cpu;
+
+        flush_workqueue(wq);
 
-        cpu_maps_update_begin();
+        /*
+         * wq list is used to freeze wq, remove from list after
+         * flushing is complete in case freeze races us.
+         */
         spin_lock(&workqueue_lock);
         list_del(&wq->list);
         spin_unlock(&workqueue_lock);
 
-        for_each_cpu(cpu, cpu_map)
-                cleanup_workqueue_thread(per_cpu_ptr(wq->cpu_wq, cpu));
-        cpu_maps_update_done();
+        /* sanity check */
+        for_each_cwq_cpu(cpu, wq) {
+                struct cpu_workqueue_struct *cwq = get_cwq(cpu, wq);
+                int i;
+
+                for (i = 0; i < WORK_NR_COLORS; i++)
+                        BUG_ON(cwq->nr_in_flight[i]);
+                BUG_ON(cwq->nr_active);
+                BUG_ON(!list_empty(&cwq->delayed_works));
+        }
+
+        if (wq->flags & WQ_RESCUER) {
+                kthread_stop(wq->rescuer->task);
+                free_mayday_mask(wq->mayday_mask);
+        }
 
-        free_percpu(wq->cpu_wq);
+        free_cwqs(wq);
         kfree(wq);
 }
 EXPORT_SYMBOL_GPL(destroy_workqueue);
 
+/**
+ * workqueue_set_max_active - adjust max_active of a workqueue
+ * @wq: target workqueue
+ * @max_active: new max_active value.
+ *
+ * Set max_active of @wq to @max_active.
+ *
+ * CONTEXT:
+ * Don't call from IRQ context.
+ */
+void workqueue_set_max_active(struct workqueue_struct *wq, int max_active)
+{
+        unsigned int cpu;
+
+        max_active = wq_clamp_max_active(max_active, wq->flags, wq->name);
+
+        spin_lock(&workqueue_lock);
+
+        wq->saved_max_active = max_active;
+
+        for_each_cwq_cpu(cpu, wq) {
+                struct global_cwq *gcwq = get_gcwq(cpu);
+
+                spin_lock_irq(&gcwq->lock);
+
+                if (!(wq->flags & WQ_FREEZEABLE) ||
+                    !(gcwq->flags & GCWQ_FREEZING))
+                        get_cwq(gcwq->cpu, wq)->max_active = max_active;
+
+                spin_unlock_irq(&gcwq->lock);
+        }
+
+        spin_unlock(&workqueue_lock);
+}
+EXPORT_SYMBOL_GPL(workqueue_set_max_active);
+
+/**
+ * workqueue_congested - test whether a workqueue is congested
+ * @cpu: CPU in question
+ * @wq: target workqueue
+ *
+ * Test whether @wq's cpu workqueue for @cpu is congested.  There is
+ * no synchronization around this function and the test result is
+ * unreliable and only useful as advisory hints or for debugging.
+ *
+ * RETURNS:
+ * %true if congested, %false otherwise.
+ */
+bool workqueue_congested(unsigned int cpu, struct workqueue_struct *wq)
+{
+        struct cpu_workqueue_struct *cwq = get_cwq(cpu, wq);
+
+        return !list_empty(&cwq->delayed_works);
+}
+EXPORT_SYMBOL_GPL(workqueue_congested);
+
+/**
+ * work_cpu - return the last known associated cpu for @work
+ * @work: the work of interest
+ *
+ * RETURNS:
+ * CPU number if @work was ever queued.  WORK_CPU_NONE otherwise.
+ */
+unsigned int work_cpu(struct work_struct *work)
+{
+        struct global_cwq *gcwq = get_work_gcwq(work);
+
+        return gcwq ? gcwq->cpu : WORK_CPU_NONE;
+}
+EXPORT_SYMBOL_GPL(work_cpu);
+
+/**
+ * work_busy - test whether a work is currently pending or running
+ * @work: the work to be tested
+ *
+ * Test whether @work is currently pending or running.  There is no
+ * synchronization around this function and the test result is
+ * unreliable and only useful as advisory hints or for debugging.
+ * Especially for reentrant wqs, the pending state might hide the
+ * running state.
+ *
+ * RETURNS:
+ * OR'd bitmask of WORK_BUSY_* bits.
+ */
+unsigned int work_busy(struct work_struct *work)
+{
+        struct global_cwq *gcwq = get_work_gcwq(work);
+        unsigned long flags;
+        unsigned int ret = 0;
+
+        if (!gcwq)
+                return false;
+
+        spin_lock_irqsave(&gcwq->lock, flags);
+
+        if (work_pending(work))
+                ret |= WORK_BUSY_PENDING;
+        if (find_worker_executing_work(gcwq, work))
+                ret |= WORK_BUSY_RUNNING;
+
+        spin_unlock_irqrestore(&gcwq->lock, flags);
+
+        return ret;
+}
+EXPORT_SYMBOL_GPL(work_busy);
+
+/*
+ * CPU hotplug.
+ *
+ * There are two challenges in supporting CPU hotplug.  Firstly, there
+ * are a lot of assumptions on strong associations among work, cwq and
+ * gcwq which make migrating pending and scheduled works very
+ * difficult to implement without impacting hot paths.  Secondly,
+ * gcwqs serve mix of short, long and very long running works making
+ * blocked draining impractical.
+ *
+ * This is solved by allowing a gcwq to be detached from CPU, running
+ * it with unbound (rogue) workers and allowing it to be reattached
+ * later if the cpu comes back online.  A separate thread is created
+ * to govern a gcwq in such state and is called the trustee of the
+ * gcwq.
+ *
+ * Trustee states and their descriptions.
+ *
+ * START        Command state used on startup.  On CPU_DOWN_PREPARE, a
+ *              new trustee is started with this state.
+ *
+ * IN_CHARGE    Once started, trustee will enter this state after
+ *              assuming the manager role and making all existing
+ *              workers rogue.  DOWN_PREPARE waits for trustee to
+ *              enter this state.  After reaching IN_CHARGE, trustee
+ *              tries to execute the pending worklist until it's empty
+ *              and the state is set to BUTCHER, or the state is set
+ *              to RELEASE.
+ *
+ * BUTCHER      Command state which is set by the cpu callback after
+ *              the cpu has went down.  Once this state is set trustee
+ *              knows that there will be no new works on the worklist
+ *              and once the worklist is empty it can proceed to
+ *              killing idle workers.
+ *
+ * RELEASE      Command state which is set by the cpu callback if the
+ *              cpu down has been canceled or it has come online
+ *              again.  After recognizing this state, trustee stops
+ *              trying to drain or butcher and clears ROGUE, rebinds
+ *              all remaining workers back to the cpu and releases
+ *              manager role.
+ *
+ * DONE         Trustee will enter this state after BUTCHER or RELEASE
+ *              is complete.
+ *
+ *          trustee                 CPU                draining
+ *         took over                down               complete
+ * START -----------> IN_CHARGE -----------> BUTCHER -----------> DONE
+ *                        |                     |                  ^
+ *                        | CPU is back online  v   return workers |
+ *                         ----------------> RELEASE --------------
+ */
+
+/**
+ * trustee_wait_event_timeout - timed event wait for trustee
+ * @cond: condition to wait for
+ * @timeout: timeout in jiffies
+ *
+ * wait_event_timeout() for trustee to use.  Handles locking and
+ * checks for RELEASE request.
+ *
+ * CONTEXT:
+ * spin_lock_irq(gcwq->lock) which may be released and regrabbed
+ * multiple times.  To be used by trustee.
+ *
+ * RETURNS:
+ * Positive indicating left time if @cond is satisfied, 0 if timed
+ * out, -1 if canceled.
+ */
+#define trustee_wait_event_timeout(cond, timeout) ({                    \
+        long __ret = (timeout);                                         \
+        while (!((cond) || (gcwq->trustee_state == TRUSTEE_RELEASE)) && \
+               __ret) {                                                 \
+                spin_unlock_irq(&gcwq->lock);                           \
+                __wait_event_timeout(gcwq->trustee_wait, (cond) ||      \
+                        (gcwq->trustee_state == TRUSTEE_RELEASE),       \
+                        __ret);                                         \
+                spin_lock_irq(&gcwq->lock);                             \
+        }                                                               \
+        gcwq->trustee_state == TRUSTEE_RELEASE ? -1 : (__ret);          \
+})
+
+/**
+ * trustee_wait_event - event wait for trustee
+ * @cond: condition to wait for
+ *
+ * wait_event() for trustee to use.  Automatically handles locking and
+ * checks for CANCEL request.
+ *
+ * CONTEXT:
+ * spin_lock_irq(gcwq->lock) which may be released and regrabbed
+ * multiple times.  To be used by trustee.
+ *
+ * RETURNS:
+ * 0 if @cond is satisfied, -1 if canceled.
+ */
+#define trustee_wait_event(cond) ({                                     \
+        long __ret1;                                                    \
+        __ret1 = trustee_wait_event_timeout(cond, MAX_SCHEDULE_TIMEOUT);\
+        __ret1 < 0 ? -1 : 0;                                            \
+})
+
+static int __cpuinit trustee_thread(void *__gcwq)
+{
+        struct global_cwq *gcwq = __gcwq;
+        struct worker *worker;
+        struct work_struct *work;
+        struct hlist_node *pos;
+        long rc;
+        int i;
+
+        BUG_ON(gcwq->cpu != smp_processor_id());
+
+        spin_lock_irq(&gcwq->lock);
+        /*
+         * Claim the manager position and make all workers rogue.
+         * Trustee must be bound to the target cpu and can't be
+         * cancelled.
+         */
+        BUG_ON(gcwq->cpu != smp_processor_id());
+        rc = trustee_wait_event(!(gcwq->flags & GCWQ_MANAGING_WORKERS));
+        BUG_ON(rc < 0);
+
+        gcwq->flags |= GCWQ_MANAGING_WORKERS;
+
+        list_for_each_entry(worker, &gcwq->idle_list, entry)
+                worker->flags |= WORKER_ROGUE;
+
+        for_each_busy_worker(worker, i, pos, gcwq)
+                worker->flags |= WORKER_ROGUE;
+
+        /*
+         * Call schedule() so that we cross rq->lock and thus can
+         * guarantee sched callbacks see the rogue flag.  This is
+         * necessary as scheduler callbacks may be invoked from other
+         * cpus.
+         */
+        spin_unlock_irq(&gcwq->lock);
+        schedule();
+        spin_lock_irq(&gcwq->lock);
+
+        /*
+         * Sched callbacks are disabled now.  Zap nr_running.  After
+         * this, nr_running stays zero and need_more_worker() and
+         * keep_working() are always true as long as the worklist is
+         * not empty.
+         */
+        atomic_set(get_gcwq_nr_running(gcwq->cpu), 0);
+
+        spin_unlock_irq(&gcwq->lock);
+        del_timer_sync(&gcwq->idle_timer);
+        spin_lock_irq(&gcwq->lock);
+
+        /*
+         * We're now in charge.  Notify and proceed to drain.  We need
+         * to keep the gcwq running during the whole CPU down
+         * procedure as other cpu hotunplug callbacks may need to
+         * flush currently running tasks.
+         */
+        gcwq->trustee_state = TRUSTEE_IN_CHARGE;
+        wake_up_all(&gcwq->trustee_wait);
+
+        /*
+         * The original cpu is in the process of dying and may go away
+         * anytime now.  When that happens, we and all workers would
+         * be migrated to other cpus.  Try draining any left work.  We
+         * want to get it over with ASAP - spam rescuers, wake up as
+         * many idlers as necessary and create new ones till the
+         * worklist is empty.  Note that if the gcwq is frozen, there
+         * may be frozen works in freezeable cwqs.  Don't declare
+         * completion while frozen.
+         */
+        while (gcwq->nr_workers != gcwq->nr_idle ||
+               gcwq->flags & GCWQ_FREEZING ||
+               gcwq->trustee_state == TRUSTEE_IN_CHARGE) {
+                int nr_works = 0;
+
+                list_for_each_entry(work, &gcwq->worklist, entry) {
+                        send_mayday(work);
+                        nr_works++;
+                }
+
+                list_for_each_entry(worker, &gcwq->idle_list, entry) {
+                        if (!nr_works--)
+                                break;
+                        wake_up_process(worker->task);
+                }
+
+                if (need_to_create_worker(gcwq)) {
+                        spin_unlock_irq(&gcwq->lock);
+                        worker = create_worker(gcwq, false);
+                        spin_lock_irq(&gcwq->lock);
+                        if (worker) {
+                                worker->flags |= WORKER_ROGUE;
+                                start_worker(worker);
+                        }
+                }
+
+                /* give a breather */
+                if (trustee_wait_event_timeout(false, TRUSTEE_COOLDOWN) < 0)
+                        break;
+        }
+
+        /*
+         * Either all works have been scheduled and cpu is down, or
+         * cpu down has already been canceled.  Wait for and butcher
+         * all workers till we're canceled.
+         */
+        do {
+                rc = trustee_wait_event(!list_empty(&gcwq->idle_list));
+                while (!list_empty(&gcwq->idle_list))
+                        destroy_worker(list_first_entry(&gcwq->idle_list,
+                                                        struct worker, entry));
+        } while (gcwq->nr_workers && rc >= 0);
+
+        /*
+         * At this point, either draining has completed and no worker
+         * is left, or cpu down has been canceled or the cpu is being
+         * brought back up.  There shouldn't be any idle one left.
+         * Tell the remaining busy ones to rebind once it finishes the
+         * currently scheduled works by scheduling the rebind_work.
+         */
+        WARN_ON(!list_empty(&gcwq->idle_list));
+
+        for_each_busy_worker(worker, i, pos, gcwq) {
+                struct work_struct *rebind_work = &worker->rebind_work;
+
+                /*
+                 * Rebind_work may race with future cpu hotplug
+                 * operations.  Use a separate flag to mark that
+                 * rebinding is scheduled.
+                 */
+                worker->flags |= WORKER_REBIND;
+                worker->flags &= ~WORKER_ROGUE;
+
+                /* queue rebind_work, wq doesn't matter, use the default one */
+                if (test_and_set_bit(WORK_STRUCT_PENDING_BIT,
+                                     work_data_bits(rebind_work)))
+                        continue;
+
+                debug_work_activate(rebind_work);
+                insert_work(get_cwq(gcwq->cpu, system_wq), rebind_work,
+                            worker->scheduled.next,
+                            work_color_to_flags(WORK_NO_COLOR));
+        }
+
+        /* relinquish manager role */
+        gcwq->flags &= ~GCWQ_MANAGING_WORKERS;
+
+        /* notify completion */
+        gcwq->trustee = NULL;
+        gcwq->trustee_state = TRUSTEE_DONE;
+        wake_up_all(&gcwq->trustee_wait);
+        spin_unlock_irq(&gcwq->lock);
+        return 0;
+}
+
+/**
+ * wait_trustee_state - wait for trustee to enter the specified state
+ * @gcwq: gcwq the trustee of interest belongs to
+ * @state: target state to wait for
+ *
+ * Wait for the trustee to reach @state.  DONE is already matched.
+ *
+ * CONTEXT:
+ * spin_lock_irq(gcwq->lock) which may be released and regrabbed
+ * multiple times.  To be used by cpu_callback.
+ */
+static void __cpuinit wait_trustee_state(struct global_cwq *gcwq, int state)
+{
+        if (!(gcwq->trustee_state == state ||
+              gcwq->trustee_state == TRUSTEE_DONE)) {
+                spin_unlock_irq(&gcwq->lock);
+                __wait_event(gcwq->trustee_wait,
+                             gcwq->trustee_state == state ||
+                             gcwq->trustee_state == TRUSTEE_DONE);
+                spin_lock_irq(&gcwq->lock);
+        }
+}
+
 static int __devinit workqueue_cpu_callback(struct notifier_block *nfb,
                                                 unsigned long action,
                                                 void *hcpu)
 {
         unsigned int cpu = (unsigned long)hcpu;
-        struct cpu_workqueue_struct *cwq;
-        struct workqueue_struct *wq;
-        int err = 0;
+        struct global_cwq *gcwq = get_gcwq(cpu);
+        struct task_struct *new_trustee = NULL;
+        struct worker *uninitialized_var(new_worker);
+        unsigned long flags;
 
         action &= ~CPU_TASKS_FROZEN;
 
         switch (action) {
+        case CPU_DOWN_PREPARE:
+                new_trustee = kthread_create(trustee_thread, gcwq,
+                                             "workqueue_trustee/%d\n", cpu);
+                if (IS_ERR(new_trustee))
+                        return notifier_from_errno(PTR_ERR(new_trustee));
+                kthread_bind(new_trustee, cpu);
+                /* fall through */
         case CPU_UP_PREPARE:
-                cpumask_set_cpu(cpu, cpu_populated_map);
-        }
-undo:
-        list_for_each_entry(wq, &workqueues, list) {
-                cwq = per_cpu_ptr(wq->cpu_wq, cpu);
-
-                switch (action) {
-                case CPU_UP_PREPARE:
-                        err = create_workqueue_thread(cwq, cpu);
-                        if (!err)
-                                break;
-                        printk(KERN_ERR "workqueue [%s] for %i failed\n",
-                                wq->name, cpu);
-                        action = CPU_UP_CANCELED;
-                        err = -ENOMEM;
-                        goto undo;
-
-                case CPU_ONLINE:
-                        start_workqueue_thread(cwq, cpu);
-                        break;
-
-                case CPU_UP_CANCELED:
-                        start_workqueue_thread(cwq, -1);
-                case CPU_POST_DEAD:
-                        cleanup_workqueue_thread(cwq);
-                        break;
+                BUG_ON(gcwq->first_idle);
+                new_worker = create_worker(gcwq, false);
+                if (!new_worker) {
+                        if (new_trustee)
+                                kthread_stop(new_trustee);
+                        return NOTIFY_BAD;
                 }
         }
 
+        /* some are called w/ irq disabled, don't disturb irq status */
+        spin_lock_irqsave(&gcwq->lock, flags);
+
         switch (action) {
-        case CPU_UP_CANCELED:
+        case CPU_DOWN_PREPARE:
+                /* initialize trustee and tell it to acquire the gcwq */
+                BUG_ON(gcwq->trustee || gcwq->trustee_state != TRUSTEE_DONE);
+                gcwq->trustee = new_trustee;
+                gcwq->trustee_state = TRUSTEE_START;
+                wake_up_process(gcwq->trustee);
+                wait_trustee_state(gcwq, TRUSTEE_IN_CHARGE);
+                /* fall through */
+        case CPU_UP_PREPARE:
+                BUG_ON(gcwq->first_idle);
+                gcwq->first_idle = new_worker;
+                break;
+
+        case CPU_DYING:
+                /*
+                 * Before this, the trustee and all workers except for
+                 * the ones which are still executing works from
+                 * before the last CPU down must be on the cpu.  After
+                 * this, they'll all be diasporas.
+                 */
+                gcwq->flags |= GCWQ_DISASSOCIATED;
+                break;
+
         case CPU_POST_DEAD:
-                cpumask_clear_cpu(cpu, cpu_populated_map);
+                gcwq->trustee_state = TRUSTEE_BUTCHER;
+                /* fall through */
+        case CPU_UP_CANCELED:
+                destroy_worker(gcwq->first_idle);
+                gcwq->first_idle = NULL;
+                break;
+
+        case CPU_DOWN_FAILED:
+        case CPU_ONLINE:
+                gcwq->flags &= ~GCWQ_DISASSOCIATED;
+                if (gcwq->trustee_state != TRUSTEE_DONE) {
+                        gcwq->trustee_state = TRUSTEE_RELEASE;
+                        wake_up_process(gcwq->trustee);
+                        wait_trustee_state(gcwq, TRUSTEE_DONE);
+                }
+
+                /*
+                 * Trustee is done and there might be no worker left.
+                 * Put the first_idle in and request a real manager to
+                 * take a look.
+                 */
+                spin_unlock_irq(&gcwq->lock);
+                kthread_bind(gcwq->first_idle->task, cpu);
+                spin_lock_irq(&gcwq->lock);
+                gcwq->flags |= GCWQ_MANAGE_WORKERS;
+                start_worker(gcwq->first_idle);
+                gcwq->first_idle = NULL;
+                break;
         }
 
-        return notifier_from_errno(err);
+        spin_unlock_irqrestore(&gcwq->lock, flags);
+
+        return notifier_from_errno(0);
 }
 
 #ifdef CONFIG_SMP
@@ -1201,14 +3390,199 @@ long work_on_cpu(unsigned int cpu, long (*fn)(void *), void *arg)
 EXPORT_SYMBOL_GPL(work_on_cpu);
 #endif /* CONFIG_SMP */
 
-void __init init_workqueues(void)
+#ifdef CONFIG_FREEZER
+
+/**
+ * freeze_workqueues_begin - begin freezing workqueues
+ *
+ * Start freezing workqueues.  After this function returns, all
+ * freezeable workqueues will queue new works to their frozen_works
+ * list instead of gcwq->worklist.
+ *
+ * CONTEXT:
+ * Grabs and releases workqueue_lock and gcwq->lock's.
+ */
+void freeze_workqueues_begin(void)
 {
-        alloc_cpumask_var(&cpu_populated_map, GFP_KERNEL);
+        unsigned int cpu;
 
-        cpumask_copy(cpu_populated_map, cpu_online_mask);
-        singlethread_cpu = cpumask_first(cpu_possible_mask);
-        cpu_singlethread_map = cpumask_of(singlethread_cpu);
-        hotcpu_notifier(workqueue_cpu_callback, 0);
-        keventd_wq = create_workqueue("events");
-        BUG_ON(!keventd_wq);
+        spin_lock(&workqueue_lock);
+
+        BUG_ON(workqueue_freezing);
+        workqueue_freezing = true;
+
+        for_each_gcwq_cpu(cpu) {
+                struct global_cwq *gcwq = get_gcwq(cpu);
+                struct workqueue_struct *wq;
+
+                spin_lock_irq(&gcwq->lock);
+
+                BUG_ON(gcwq->flags & GCWQ_FREEZING);
+                gcwq->flags |= GCWQ_FREEZING;
+
+                list_for_each_entry(wq, &workqueues, list) {
+                        struct cpu_workqueue_struct *cwq = get_cwq(cpu, wq);
+
+                        if (cwq && wq->flags & WQ_FREEZEABLE)
+                                cwq->max_active = 0;
+                }
+
+                spin_unlock_irq(&gcwq->lock);
+        }
+
+        spin_unlock(&workqueue_lock);
+}
+
+/**
+ * freeze_workqueues_busy - are freezeable workqueues still busy?
+ *
+ * Check whether freezing is complete.  This function must be called
+ * between freeze_workqueues_begin() and thaw_workqueues().
+ *
+ * CONTEXT:
+ * Grabs and releases workqueue_lock.
+ *
+ * RETURNS:
+ * %true if some freezeable workqueues are still busy.  %false if
+ * freezing is complete.
+ */
+bool freeze_workqueues_busy(void)
+{
+        unsigned int cpu;
+        bool busy = false;
+
+        spin_lock(&workqueue_lock);
+
+        BUG_ON(!workqueue_freezing);
+
+        for_each_gcwq_cpu(cpu) {
+                struct workqueue_struct *wq;
+                /*
+                 * nr_active is monotonically decreasing.  It's safe
+                 * to peek without lock.
+                 */
+                list_for_each_entry(wq, &workqueues, list) {
+                        struct cpu_workqueue_struct *cwq = get_cwq(cpu, wq);
+
+                        if (!cwq || !(wq->flags & WQ_FREEZEABLE))
+                                continue;
+
+                        BUG_ON(cwq->nr_active < 0);
+                        if (cwq->nr_active) {
+                                busy = true;
+                                goto out_unlock;
+                        }
+                }
+        }
+out_unlock:
+        spin_unlock(&workqueue_lock);
+        return busy;
+}
+
+/**
+ * thaw_workqueues - thaw workqueues
+ *
+ * Thaw workqueues.  Normal queueing is restored and all collected
+ * frozen works are transferred to their respective gcwq worklists.
+ *
+ * CONTEXT:
+ * Grabs and releases workqueue_lock and gcwq->lock's.
+ */
+void thaw_workqueues(void)
+{
+        unsigned int cpu;
+
+        spin_lock(&workqueue_lock);
+
+        if (!workqueue_freezing)
+                goto out_unlock;
+
+        for_each_gcwq_cpu(cpu) {
+                struct global_cwq *gcwq = get_gcwq(cpu);
+                struct workqueue_struct *wq;
+
+                spin_lock_irq(&gcwq->lock);
+
+                BUG_ON(!(gcwq->flags & GCWQ_FREEZING));
+                gcwq->flags &= ~GCWQ_FREEZING;
+
+                list_for_each_entry(wq, &workqueues, list) {
+                        struct cpu_workqueue_struct *cwq = get_cwq(cpu, wq);
+
+                        if (!cwq || !(wq->flags & WQ_FREEZEABLE))
+                                continue;
+
+                        /* restore max_active and repopulate worklist */
+                        cwq->max_active = wq->saved_max_active;
+
+                        while (!list_empty(&cwq->delayed_works) &&
+                               cwq->nr_active < cwq->max_active)
+                                cwq_activate_first_delayed(cwq);
+                }
+
+                wake_up_worker(gcwq);
+
+                spin_unlock_irq(&gcwq->lock);
+        }
+
+        workqueue_freezing = false;
+out_unlock:
+        spin_unlock(&workqueue_lock);
+}
+#endif /* CONFIG_FREEZER */
+
+static int __init init_workqueues(void)
+{
+        unsigned int cpu;
+        int i;
+
+        cpu_notifier(workqueue_cpu_callback, CPU_PRI_WORKQUEUE);
+
+        /* initialize gcwqs */
+        for_each_gcwq_cpu(cpu) {
+                struct global_cwq *gcwq = get_gcwq(cpu);
+
+                spin_lock_init(&gcwq->lock);
+                INIT_LIST_HEAD(&gcwq->worklist);
+                gcwq->cpu = cpu;
+                if (cpu == WORK_CPU_UNBOUND)
+                        gcwq->flags |= GCWQ_DISASSOCIATED;
+
+                INIT_LIST_HEAD(&gcwq->idle_list);
+                for (i = 0; i < BUSY_WORKER_HASH_SIZE; i++)
+                        INIT_HLIST_HEAD(&gcwq->busy_hash[i]);
+
+                init_timer_deferrable(&gcwq->idle_timer);
+                gcwq->idle_timer.function = idle_worker_timeout;
+                gcwq->idle_timer.data = (unsigned long)gcwq;
+
+                setup_timer(&gcwq->mayday_timer, gcwq_mayday_timeout,
+                            (unsigned long)gcwq);
+
+                ida_init(&gcwq->worker_ida);
+
+                gcwq->trustee_state = TRUSTEE_DONE;
+                init_waitqueue_head(&gcwq->trustee_wait);
+        }
+
+        /* create the initial worker */
+        for_each_online_gcwq_cpu(cpu) {
+                struct global_cwq *gcwq = get_gcwq(cpu);
+                struct worker *worker;
+
+                worker = create_worker(gcwq, true);
+                BUG_ON(!worker);
+                spin_lock_irq(&gcwq->lock);
+                start_worker(worker);
+                spin_unlock_irq(&gcwq->lock);
+        }
+
+        system_wq = alloc_workqueue("events", 0, 0);
+        system_long_wq = alloc_workqueue("events_long", 0, 0);
+        system_nrt_wq = alloc_workqueue("events_nrt", WQ_NON_REENTRANT, 0);
+        system_unbound_wq = alloc_workqueue("events_unbound", WQ_UNBOUND,
+                                            WQ_UNBOUND_MAX_ACTIVE);
+        BUG_ON(!system_wq || !system_long_wq || !system_nrt_wq);
+        return 0;
 }
+early_initcall(init_workqueues);
diff --git a/kernel/workqueue_sched.h b/kernel/workqueue_sched.h
new file mode 100644
index 000000000000..2d10fc98dc79
--- /dev/null
+++ b/kernel/workqueue_sched.h
@@ -0,0 +1,9 @@
+/*
+ * kernel/workqueue_sched.h
+ *
+ * Scheduler hooks for concurrency managed workqueue.  Only to be
+ * included from sched.c and workqueue.c.
+ */
+void wq_worker_waking_up(struct task_struct *task, unsigned int cpu);
+struct task_struct *wq_worker_sleeping(struct task_struct *task,
+                                       unsigned int cpu);