48 files changed, 2462 insertions, 966 deletions

diff --git a/kernel/Makefile b/kernel/Makefile
index e4791b3ba55d..bab1dffe37e9 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -93,6 +93,7 @@ obj-$(CONFIG_HAVE_GENERIC_DMA_COHERENT) += dma-coherent.o
 obj-$(CONFIG_FUNCTION_TRACER) += trace/
 obj-$(CONFIG_TRACING) += trace/
 obj-$(CONFIG_SMP) += sched_cpupri.o
+obj-$(CONFIG_SLOW_WORK) += slow-work.o
 
 ifneq ($(CONFIG_SCHED_OMIT_FRAME_POINTER),y)
 # According to Alan Modra <alan@linuxcare.com.au>, the -fno-omit-frame-pointer is
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 8cbddff6c283..2bfc64786765 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -66,6 +66,7 @@
 #include <linux/syscalls.h>
 #include <linux/inotify.h>
 #include <linux/capability.h>
+#include <linux/fs_struct.h>
 
 #include "audit.h"
 
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index c500ca7239b2..382109b5baeb 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -94,7 +94,6 @@ struct cgroupfs_root {
         char release_agent_path[PATH_MAX];
 };
 
-
 /*
  * The "rootnode" hierarchy is the "dummy hierarchy", reserved for the
  * subsystems that are otherwise unattached - it never has more than a
@@ -102,6 +101,39 @@ struct cgroupfs_root {
  */
 static struct cgroupfs_root rootnode;
 
+/*
+ * CSS ID -- ID per subsys's Cgroup Subsys State(CSS). used only when
+ * cgroup_subsys->use_id != 0.
+ */
+#define CSS_ID_MAX      (65535)
+struct css_id {
+        /*
+         * The css to which this ID points. This pointer is set to valid value
+         * after cgroup is populated. If cgroup is removed, this will be NULL.
+         * This pointer is expected to be RCU-safe because destroy()
+         * is called after synchronize_rcu(). But for safe use, css_is_removed()
+         * css_tryget() should be used for avoiding race.
+         */
+        struct cgroup_subsys_state *css;
+        /*
+         * ID of this css.
+         */
+        unsigned short id;
+        /*
+         * Depth in hierarchy which this ID belongs to.
+         */
+        unsigned short depth;
+        /*
+         * ID is freed by RCU. (and lookup routine is RCU safe.)
+         */
+        struct rcu_head rcu_head;
+        /*
+         * Hierarchy of CSS ID belongs to.
+         */
+        unsigned short stack[0]; /* Array of Length (depth+1) */
+};
+
+
 /* The list of hierarchy roots */
 
 static LIST_HEAD(roots);
@@ -185,6 +217,8 @@ struct cg_cgroup_link {
 static struct css_set init_css_set;
 static struct cg_cgroup_link init_css_set_link;
 
+static int cgroup_subsys_init_idr(struct cgroup_subsys *ss);
+
 /* css_set_lock protects the list of css_set objects, and the
  * chain of tasks off each css_set.  Nests outside task->alloc_lock
  * due to cgroup_iter_start() */
@@ -567,6 +601,9 @@ static struct backing_dev_info cgroup_backing_dev_info = {
         .capabilities   = BDI_CAP_NO_ACCT_AND_WRITEBACK,
 };
 
+static int alloc_css_id(struct cgroup_subsys *ss,
+                        struct cgroup *parent, struct cgroup *child);
+
 static struct inode *cgroup_new_inode(mode_t mode, struct super_block *sb)
 {
         struct inode *inode = new_inode(sb);
@@ -585,13 +622,18 @@ static struct inode *cgroup_new_inode(mode_t mode, struct super_block *sb)
  * Call subsys's pre_destroy handler.
  * This is called before css refcnt check.
  */
-static void cgroup_call_pre_destroy(struct cgroup *cgrp)
+static int cgroup_call_pre_destroy(struct cgroup *cgrp)
 {
         struct cgroup_subsys *ss;
+        int ret = 0;
+
         for_each_subsys(cgrp->root, ss)
-                if (ss->pre_destroy)
-                        ss->pre_destroy(ss, cgrp);
-        return;
+                if (ss->pre_destroy) {
+                        ret = ss->pre_destroy(ss, cgrp);
+                        if (ret)
+                                break;
+                }
+        return ret;
 }
 
 static void free_cgroup_rcu(struct rcu_head *obj)
@@ -685,6 +727,22 @@ static void cgroup_d_remove_dir(struct dentry *dentry)
         remove_dir(dentry);
 }
 
+/*
+ * A queue for waiters to do rmdir() cgroup. A tasks will sleep when
+ * cgroup->count == 0 && list_empty(&cgroup->children) && subsys has some
+ * reference to css->refcnt. In general, this refcnt is expected to goes down
+ * to zero, soon.
+ *
+ * CGRP_WAIT_ON_RMDIR flag is modified under cgroup's inode->i_mutex;
+ */
+DECLARE_WAIT_QUEUE_HEAD(cgroup_rmdir_waitq);
+
+static void cgroup_wakeup_rmdir_waiters(const struct cgroup *cgrp)
+{
+        if (unlikely(test_bit(CGRP_WAIT_ON_RMDIR, &cgrp->flags)))
+                wake_up_all(&cgroup_rmdir_waitq);
+}
+
 static int rebind_subsystems(struct cgroupfs_root *root,
                               unsigned long final_bits)
 {
@@ -857,16 +915,16 @@ static int cgroup_remount(struct super_block *sb, int *flags, char *data)
         }
 
         ret = rebind_subsystems(root, opts.subsys_bits);
+        if (ret)
+                goto out_unlock;
 
         /* (re)populate subsystem files */
-        if (!ret)
-                cgroup_populate_dir(cgrp);
+        cgroup_populate_dir(cgrp);
 
         if (opts.release_agent)
                 strcpy(root->release_agent_path, opts.release_agent);
  out_unlock:
-        if (opts.release_agent)
-                kfree(opts.release_agent);
+        kfree(opts.release_agent);
         mutex_unlock(&cgroup_mutex);
         mutex_unlock(&cgrp->dentry->d_inode->i_mutex);
         return ret;
@@ -969,15 +1027,13 @@ static int cgroup_get_sb(struct file_system_type *fs_type,
         /* First find the desired set of subsystems */
         ret = parse_cgroupfs_options(data, &opts);
         if (ret) {
-                if (opts.release_agent)
-                        kfree(opts.release_agent);
+                kfree(opts.release_agent);
                 return ret;
         }
 
         root = kzalloc(sizeof(*root), GFP_KERNEL);
         if (!root) {
-                if (opts.release_agent)
-                        kfree(opts.release_agent);
+                kfree(opts.release_agent);
                 return -ENOMEM;
         }
 
@@ -1280,6 +1336,12 @@ int cgroup_attach_task(struct cgroup *cgrp, struct task_struct *tsk)
         set_bit(CGRP_RELEASABLE, &oldcgrp->flags);
         synchronize_rcu();
         put_css_set(cg);
+
+        /*
+         * wake up rmdir() waiter. the rmdir should fail since the cgroup
+         * is no longer empty.
+         */
+        cgroup_wakeup_rmdir_waiters(cgrp);
         return 0;
 }
 
@@ -1625,7 +1687,7 @@ static struct inode_operations cgroup_dir_inode_operations = {
         .rename = cgroup_rename,
 };
 
-static int cgroup_create_file(struct dentry *dentry, int mode,
+static int cgroup_create_file(struct dentry *dentry, mode_t mode,
                                 struct super_block *sb)
 {
         static const struct dentry_operations cgroup_dops = {
@@ -1671,7 +1733,7 @@ static int cgroup_create_file(struct dentry *dentry, int mode,
  * @mode: mode to set on new directory.
  */
 static int cgroup_create_dir(struct cgroup *cgrp, struct dentry *dentry,
-                                int mode)
+                                mode_t mode)
 {
         struct dentry *parent;
         int error = 0;
@@ -1689,6 +1751,33 @@ static int cgroup_create_dir(struct cgroup *cgrp, struct dentry *dentry,
         return error;
 }
 
+/**
+ * cgroup_file_mode - deduce file mode of a control file
+ * @cft: the control file in question
+ *
+ * returns cft->mode if ->mode is not 0
+ * returns S_IRUGO|S_IWUSR if it has both a read and a write handler
+ * returns S_IRUGO if it has only a read handler
+ * returns S_IWUSR if it has only a write hander
+ */
+static mode_t cgroup_file_mode(const struct cftype *cft)
+{
+        mode_t mode = 0;
+
+        if (cft->mode)
+                return cft->mode;
+
+        if (cft->read || cft->read_u64 || cft->read_s64 ||
+            cft->read_map || cft->read_seq_string)
+                mode |= S_IRUGO;
+
+        if (cft->write || cft->write_u64 || cft->write_s64 ||
+            cft->write_string || cft->trigger)
+                mode |= S_IWUSR;
+
+        return mode;
+}
+
 int cgroup_add_file(struct cgroup *cgrp,
                        struct cgroup_subsys *subsys,
                        const struct cftype *cft)
@@ -1696,6 +1785,7 @@ int cgroup_add_file(struct cgroup *cgrp,
         struct dentry *dir = cgrp->dentry;
         struct dentry *dentry;
         int error;
+        mode_t mode;
 
         char name[MAX_CGROUP_TYPE_NAMELEN + MAX_CFTYPE_NAME + 2] = { 0 };
         if (subsys && !test_bit(ROOT_NOPREFIX, &cgrp->root->flags)) {
@@ -1706,7 +1796,8 @@ int cgroup_add_file(struct cgroup *cgrp,
         BUG_ON(!mutex_is_locked(&dir->d_inode->i_mutex));
         dentry = lookup_one_len(name, dir, strlen(name));
         if (!IS_ERR(dentry)) {
-                error = cgroup_create_file(dentry, 0644 | S_IFREG,
+                mode = cgroup_file_mode(cft);
+                error = cgroup_create_file(dentry, mode | S_IFREG,
                                                 cgrp->root->sb);
                 if (!error)
                         dentry->d_fsdata = (void *)cft;
@@ -2288,6 +2379,7 @@ static struct cftype files[] = {
                 .write_u64 = cgroup_tasks_write,
                 .release = cgroup_tasks_release,
                 .private = FILE_TASKLIST,
+                .mode = S_IRUGO | S_IWUSR,
         },
 
         {
@@ -2327,6 +2419,17 @@ static int cgroup_populate_dir(struct cgroup *cgrp)
                 if (ss->populate && (err = ss->populate(ss, cgrp)) < 0)
                         return err;
         }
+        /* This cgroup is ready now */
+        for_each_subsys(cgrp->root, ss) {
+                struct cgroup_subsys_state *css = cgrp->subsys[ss->subsys_id];
+                /*
+                 * Update id->css pointer and make this css visible from
+                 * CSS ID functions. This pointer will be dereferened
+                 * from RCU-read-side without locks.
+                 */
+                if (css->id)
+                        rcu_assign_pointer(css->id->css, css);
+        }
 
         return 0;
 }
@@ -2338,6 +2441,7 @@ static void init_cgroup_css(struct cgroup_subsys_state *css,
         css->cgroup = cgrp;
         atomic_set(&css->refcnt, 1);
         css->flags = 0;
+        css->id = NULL;
         if (cgrp == dummytop)
                 set_bit(CSS_ROOT, &css->flags);
         BUG_ON(cgrp->subsys[ss->subsys_id]);
@@ -2376,7 +2480,7 @@ static void cgroup_unlock_hierarchy(struct cgroupfs_root *root)
  * Must be called with the mutex on the parent inode held
  */
 static long cgroup_create(struct cgroup *parent, struct dentry *dentry,
-                             int mode)
+                             mode_t mode)
 {
         struct cgroup *cgrp;
         struct cgroupfs_root *root = parent->root;
@@ -2413,6 +2517,10 @@ static long cgroup_create(struct cgroup *parent, struct dentry *dentry,
                         goto err_destroy;
                 }
                 init_cgroup_css(css, ss, cgrp);
+                if (ss->use_id)
+                        if (alloc_css_id(ss, parent, cgrp))
+                                goto err_destroy;
+                /* At error, ->destroy() callback has to free assigned ID. */
         }
 
         cgroup_lock_hierarchy(root);
@@ -2555,9 +2663,11 @@ static int cgroup_rmdir(struct inode *unused_dir, struct dentry *dentry)
         struct cgroup *cgrp = dentry->d_fsdata;
         struct dentry *d;
         struct cgroup *parent;
+        DEFINE_WAIT(wait);
+        int ret;
 
         /* the vfs holds both inode->i_mutex already */
-
+again:
         mutex_lock(&cgroup_mutex);
         if (atomic_read(&cgrp->count) != 0) {
                 mutex_unlock(&cgroup_mutex);
@@ -2573,17 +2683,39 @@ static int cgroup_rmdir(struct inode *unused_dir, struct dentry *dentry)
          * Call pre_destroy handlers of subsys. Notify subsystems
          * that rmdir() request comes.
          */
-        cgroup_call_pre_destroy(cgrp);
+        ret = cgroup_call_pre_destroy(cgrp);
+        if (ret)
+                return ret;
 
         mutex_lock(&cgroup_mutex);
         parent = cgrp->parent;
-
-        if (atomic_read(&cgrp->count)
-            || !list_empty(&cgrp->children)
-            || !cgroup_clear_css_refs(cgrp)) {
+        if (atomic_read(&cgrp->count) || !list_empty(&cgrp->children)) {
                 mutex_unlock(&cgroup_mutex);
                 return -EBUSY;
         }
+        /*
+         * css_put/get is provided for subsys to grab refcnt to css. In typical
+         * case, subsystem has no reference after pre_destroy(). But, under
+         * hierarchy management, some *temporal* refcnt can be hold.
+         * To avoid returning -EBUSY to a user, waitqueue is used. If subsys
+         * is really busy, it should return -EBUSY at pre_destroy(). wake_up
+         * is called when css_put() is called and refcnt goes down to 0.
+         */
+        set_bit(CGRP_WAIT_ON_RMDIR, &cgrp->flags);
+        prepare_to_wait(&cgroup_rmdir_waitq, &wait, TASK_INTERRUPTIBLE);
+
+        if (!cgroup_clear_css_refs(cgrp)) {
+                mutex_unlock(&cgroup_mutex);
+                schedule();
+                finish_wait(&cgroup_rmdir_waitq, &wait);
+                clear_bit(CGRP_WAIT_ON_RMDIR, &cgrp->flags);
+                if (signal_pending(current))
+                        return -EINTR;
+                goto again;
+        }
+        /* NO css_tryget() can success after here. */
+        finish_wait(&cgroup_rmdir_waitq, &wait);
+        clear_bit(CGRP_WAIT_ON_RMDIR, &cgrp->flags);
 
         spin_lock(&release_list_lock);
         set_bit(CGRP_REMOVED, &cgrp->flags);
@@ -2708,6 +2840,8 @@ int __init cgroup_init(void)
                 struct cgroup_subsys *ss = subsys[i];
                 if (!ss->early_init)
                         cgroup_init_subsys(ss);
+                if (ss->use_id)
+                        cgroup_subsys_init_idr(ss);
         }
 
         /* Add init_css_set to the hash table */
@@ -3084,18 +3218,19 @@ int cgroup_clone(struct task_struct *tsk, struct cgroup_subsys *subsys,
 }
 
 /**
- * cgroup_is_descendant - see if @cgrp is a descendant of current task's cgrp
+ * cgroup_is_descendant - see if @cgrp is a descendant of @task's cgrp
  * @cgrp: the cgroup in question
+ * @task: the task in question
  *
- * See if @cgrp is a descendant of the current task's cgroup in
- * the appropriate hierarchy.
+ * See if @cgrp is a descendant of @task's cgroup in the appropriate
+ * hierarchy.
  *
  * If we are sending in dummytop, then presumably we are creating
  * the top cgroup in the subsystem.
  *
  * Called only by the ns (nsproxy) cgroup.
  */
-int cgroup_is_descendant(const struct cgroup *cgrp)
+int cgroup_is_descendant(const struct cgroup *cgrp, struct task_struct *task)
 {
         int ret;
         struct cgroup *target;
@@ -3105,7 +3240,7 @@ int cgroup_is_descendant(const struct cgroup *cgrp)
                 return 1;
 
         get_first_subsys(cgrp, NULL, &subsys_id);
-        target = task_cgroup(current, subsys_id);
+        target = task_cgroup(task, subsys_id);
         while (cgrp != target && cgrp!= cgrp->top_cgroup)
                 cgrp = cgrp->parent;
         ret = (cgrp == target);
@@ -3138,10 +3273,12 @@ void __css_put(struct cgroup_subsys_state *css)
 {
         struct cgroup *cgrp = css->cgroup;
         rcu_read_lock();
-        if ((atomic_dec_return(&css->refcnt) == 1) &&
-            notify_on_release(cgrp)) {
-                set_bit(CGRP_RELEASABLE, &cgrp->flags);
-                check_for_release(cgrp);
+        if (atomic_dec_return(&css->refcnt) == 1) {
+                if (notify_on_release(cgrp)) {
+                        set_bit(CGRP_RELEASABLE, &cgrp->flags);
+                        check_for_release(cgrp);
+                }
+                cgroup_wakeup_rmdir_waiters(cgrp);
         }
         rcu_read_unlock();
 }
@@ -3241,3 +3378,232 @@ static int __init cgroup_disable(char *str)
         return 1;
 }
 __setup("cgroup_disable=", cgroup_disable);
+
+/*
+ * Functons for CSS ID.
+ */
+
+/*
+ *To get ID other than 0, this should be called when !cgroup_is_removed().
+ */
+unsigned short css_id(struct cgroup_subsys_state *css)
+{
+        struct css_id *cssid = rcu_dereference(css->id);
+
+        if (cssid)
+                return cssid->id;
+        return 0;
+}
+
+unsigned short css_depth(struct cgroup_subsys_state *css)
+{
+        struct css_id *cssid = rcu_dereference(css->id);
+
+        if (cssid)
+                return cssid->depth;
+        return 0;
+}
+
+bool css_is_ancestor(struct cgroup_subsys_state *child,
+                    const struct cgroup_subsys_state *root)
+{
+        struct css_id *child_id = rcu_dereference(child->id);
+        struct css_id *root_id = rcu_dereference(root->id);
+
+        if (!child_id || !root_id || (child_id->depth < root_id->depth))
+                return false;
+        return child_id->stack[root_id->depth] == root_id->id;
+}
+
+static void __free_css_id_cb(struct rcu_head *head)
+{
+        struct css_id *id;
+
+        id = container_of(head, struct css_id, rcu_head);
+        kfree(id);
+}
+
+void free_css_id(struct cgroup_subsys *ss, struct cgroup_subsys_state *css)
+{
+        struct css_id *id = css->id;
+        /* When this is called before css_id initialization, id can be NULL */
+        if (!id)
+                return;
+
+        BUG_ON(!ss->use_id);
+
+        rcu_assign_pointer(id->css, NULL);
+        rcu_assign_pointer(css->id, NULL);
+        spin_lock(&ss->id_lock);
+        idr_remove(&ss->idr, id->id);
+        spin_unlock(&ss->id_lock);
+        call_rcu(&id->rcu_head, __free_css_id_cb);
+}
+
+/*
+ * This is called by init or create(). Then, calls to this function are
+ * always serialized (By cgroup_mutex() at create()).
+ */
+
+static struct css_id *get_new_cssid(struct cgroup_subsys *ss, int depth)
+{
+        struct css_id *newid;
+        int myid, error, size;
+
+        BUG_ON(!ss->use_id);
+
+        size = sizeof(*newid) + sizeof(unsigned short) * (depth + 1);
+        newid = kzalloc(size, GFP_KERNEL);
+        if (!newid)
+                return ERR_PTR(-ENOMEM);
+        /* get id */
+        if (unlikely(!idr_pre_get(&ss->idr, GFP_KERNEL))) {
+                error = -ENOMEM;
+                goto err_out;
+        }
+        spin_lock(&ss->id_lock);
+        /* Don't use 0. allocates an ID of 1-65535 */
+        error = idr_get_new_above(&ss->idr, newid, 1, &myid);
+        spin_unlock(&ss->id_lock);
+
+        /* Returns error when there are no free spaces for new ID.*/
+        if (error) {
+                error = -ENOSPC;
+                goto err_out;
+        }
+        if (myid > CSS_ID_MAX)
+                goto remove_idr;
+
+        newid->id = myid;
+        newid->depth = depth;
+        return newid;
+remove_idr:
+        error = -ENOSPC;
+        spin_lock(&ss->id_lock);
+        idr_remove(&ss->idr, myid);
+        spin_unlock(&ss->id_lock);
+err_out:
+        kfree(newid);
+        return ERR_PTR(error);
+
+}
+
+static int __init cgroup_subsys_init_idr(struct cgroup_subsys *ss)
+{
+        struct css_id *newid;
+        struct cgroup_subsys_state *rootcss;
+
+        spin_lock_init(&ss->id_lock);
+        idr_init(&ss->idr);
+
+        rootcss = init_css_set.subsys[ss->subsys_id];
+        newid = get_new_cssid(ss, 0);
+        if (IS_ERR(newid))
+                return PTR_ERR(newid);
+
+        newid->stack[0] = newid->id;
+        newid->css = rootcss;
+        rootcss->id = newid;
+        return 0;
+}
+
+static int alloc_css_id(struct cgroup_subsys *ss, struct cgroup *parent,
+                        struct cgroup *child)
+{
+        int subsys_id, i, depth = 0;
+        struct cgroup_subsys_state *parent_css, *child_css;
+        struct css_id *child_id, *parent_id = NULL;
+
+        subsys_id = ss->subsys_id;
+        parent_css = parent->subsys[subsys_id];
+        child_css = child->subsys[subsys_id];
+        depth = css_depth(parent_css) + 1;
+        parent_id = parent_css->id;
+
+        child_id = get_new_cssid(ss, depth);
+        if (IS_ERR(child_id))
+                return PTR_ERR(child_id);
+
+        for (i = 0; i < depth; i++)
+                child_id->stack[i] = parent_id->stack[i];
+        child_id->stack[depth] = child_id->id;
+        /*
+         * child_id->css pointer will be set after this cgroup is available
+         * see cgroup_populate_dir()
+         */
+        rcu_assign_pointer(child_css->id, child_id);
+
+        return 0;
+}
+
+/**
+ * css_lookup - lookup css by id
+ * @ss: cgroup subsys to be looked into.
+ * @id: the id
+ *
+ * Returns pointer to cgroup_subsys_state if there is valid one with id.
+ * NULL if not. Should be called under rcu_read_lock()
+ */
+struct cgroup_subsys_state *css_lookup(struct cgroup_subsys *ss, int id)
+{
+        struct css_id *cssid = NULL;
+
+        BUG_ON(!ss->use_id);
+        cssid = idr_find(&ss->idr, id);
+
+        if (unlikely(!cssid))
+                return NULL;
+
+        return rcu_dereference(cssid->css);
+}
+
+/**
+ * css_get_next - lookup next cgroup under specified hierarchy.
+ * @ss: pointer to subsystem
+ * @id: current position of iteration.
+ * @root: pointer to css. search tree under this.
+ * @foundid: position of found object.
+ *
+ * Search next css under the specified hierarchy of rootid. Calling under
+ * rcu_read_lock() is necessary. Returns NULL if it reaches the end.
+ */
+struct cgroup_subsys_state *
+css_get_next(struct cgroup_subsys *ss, int id,
+             struct cgroup_subsys_state *root, int *foundid)
+{
+        struct cgroup_subsys_state *ret = NULL;
+        struct css_id *tmp;
+        int tmpid;
+        int rootid = css_id(root);
+        int depth = css_depth(root);
+
+        if (!rootid)
+                return NULL;
+
+        BUG_ON(!ss->use_id);
+        /* fill start point for scan */
+        tmpid = id;
+        while (1) {
+                /*
+                 * scan next entry from bitmap(tree), tmpid is updated after
+                 * idr_get_next().
+                 */
+                spin_lock(&ss->id_lock);
+                tmp = idr_get_next(&ss->idr, &tmpid);
+                spin_unlock(&ss->id_lock);
+
+                if (!tmp)
+                        break;
+                if (tmp->depth >= depth && tmp->stack[depth] == rootid) {
+                        ret = rcu_dereference(tmp->css);
+                        if (ret) {
+                                *foundid = tmpid;
+                                break;
+                        }
+                }
+                /* continue to scan from next id */
+                tmpid = tmpid + 1;
+        }
+        return ret;
+}
+
diff --git a/kernel/cgroup_debug.c b/kernel/cgroup_debug.c
index daca6209202d..0c92d797baa6 100644
--- a/kernel/cgroup_debug.c
+++ b/kernel/cgroup_debug.c
@@ -40,9 +40,7 @@ static u64 taskcount_read(struct cgroup *cont, struct cftype *cft)
 {
         u64 count;
 
-        cgroup_lock();
         count = cgroup_task_count(cont);
-        cgroup_unlock();
         return count;
 }
 
diff --git a/kernel/cpu.c b/kernel/cpu.c
index 79e40f00dcb8..395b6974dc8d 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -281,7 +281,7 @@ int __ref cpu_down(unsigned int cpu)
                 goto out;
         }
 
-        cpu_clear(cpu, cpu_active_map);
+        set_cpu_active(cpu, false);
 
         /*
          * Make sure the all cpus did the reschedule and are not
@@ -296,7 +296,7 @@ int __ref cpu_down(unsigned int cpu)
         err = _cpu_down(cpu, 0);
 
         if (cpu_online(cpu))
-                cpu_set(cpu, cpu_active_map);
+                set_cpu_active(cpu, true);
 
 out:
         cpu_maps_update_done();
@@ -333,7 +333,7 @@ static int __cpuinit _cpu_up(unsigned int cpu, int tasks_frozen)
                 goto out_notify;
         BUG_ON(!cpu_online(cpu));
 
-        cpu_set(cpu, cpu_active_map);
+        set_cpu_active(cpu, true);
 
         /* Now call notifier in preparation. */
         raw_notifier_call_chain(&cpu_chain, CPU_ONLINE | mod, hcpu);
diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index f76db9dcaa05..026faccca869 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -128,10 +128,6 @@ static inline struct cpuset *task_cs(struct task_struct *task)
         return container_of(task_subsys_state(task, cpuset_subsys_id),
                             struct cpuset, css);
 }
-struct cpuset_hotplug_scanner {
-        struct cgroup_scanner scan;
-        struct cgroup *to;
-};
 
 /* bits in struct cpuset flags field */
 typedef enum {
@@ -521,6 +517,7 @@ static int validate_change(const struct cpuset *cur, const struct cpuset *trial)
         return 0;
 }
 
+#ifdef CONFIG_SMP
 /*
  * Helper routine for generate_sched_domains().
  * Do cpusets a, b have overlapping cpus_allowed masks?
@@ -815,6 +812,18 @@ static void do_rebuild_sched_domains(struct work_struct *unused)
 
         put_online_cpus();
 }
+#else /* !CONFIG_SMP */
+static void do_rebuild_sched_domains(struct work_struct *unused)
+{
+}
+
+static int generate_sched_domains(struct cpumask **domains,
+                        struct sched_domain_attr **attributes)
+{
+        *domains = NULL;
+        return 1;
+}
+#endif /* CONFIG_SMP */
 
 static DECLARE_WORK(rebuild_sched_domains_work, do_rebuild_sched_domains);
 
@@ -1026,101 +1035,70 @@ static void cpuset_migrate_mm(struct mm_struct *mm, const nodemask_t *from,
         mutex_unlock(&callback_mutex);
 }
 
+/*
+ * Rebind task's vmas to cpuset's new mems_allowed, and migrate pages to new
+ * nodes if memory_migrate flag is set. Called with cgroup_mutex held.
+ */
+static void cpuset_change_nodemask(struct task_struct *p,
+                                   struct cgroup_scanner *scan)
+{
+        struct mm_struct *mm;
+        struct cpuset *cs;
+        int migrate;
+        const nodemask_t *oldmem = scan->data;
+
+        mm = get_task_mm(p);
+        if (!mm)
+                return;
+
+        cs = cgroup_cs(scan->cg);
+        migrate = is_memory_migrate(cs);
+
+        mpol_rebind_mm(mm, &cs->mems_allowed);
+        if (migrate)
+                cpuset_migrate_mm(mm, oldmem, &cs->mems_allowed);
+        mmput(mm);
+}
+
 static void *cpuset_being_rebound;
 
 /**
  * update_tasks_nodemask - Update the nodemasks of tasks in the cpuset.
  * @cs: the cpuset in which each task's mems_allowed mask needs to be changed
  * @oldmem: old mems_allowed of cpuset cs
+ * @heap: if NULL, defer allocating heap memory to cgroup_scan_tasks()
  *
  * Called with cgroup_mutex held
- * Return 0 if successful, -errno if not.
+ * No return value. It's guaranteed that cgroup_scan_tasks() always returns 0
+ * if @heap != NULL.
  */
-static int update_tasks_nodemask(struct cpuset *cs, const nodemask_t *oldmem)
+static void update_tasks_nodemask(struct cpuset *cs, const nodemask_t *oldmem,
+                                 struct ptr_heap *heap)
 {
-        struct task_struct *p;
-        struct mm_struct **mmarray;
-        int i, n, ntasks;
-        int migrate;
-        int fudge;
-        struct cgroup_iter it;
-        int retval;
+        struct cgroup_scanner scan;
 
         cpuset_being_rebound = cs;              /* causes mpol_dup() rebind */
 
-        fudge = 10;                             /* spare mmarray[] slots */
-        fudge += cpumask_weight(cs->cpus_allowed);/* imagine 1 fork-bomb/cpu */
-        retval = -ENOMEM;
-
-        /*
-         * Allocate mmarray[] to hold mm reference for each task
-         * in cpuset cs.  Can't kmalloc GFP_KERNEL while holding
-         * tasklist_lock.  We could use GFP_ATOMIC, but with a
-         * few more lines of code, we can retry until we get a big
-         * enough mmarray[] w/o using GFP_ATOMIC.
-         */
-        while (1) {
-                ntasks = cgroup_task_count(cs->css.cgroup);  /* guess */
-                ntasks += fudge;
-                mmarray = kmalloc(ntasks * sizeof(*mmarray), GFP_KERNEL);
-                if (!mmarray)
-                        goto done;
-                read_lock(&tasklist_lock);              /* block fork */
-                if (cgroup_task_count(cs->css.cgroup) <= ntasks)
-                        break;                          /* got enough */
-                read_unlock(&tasklist_lock);            /* try again */
-                kfree(mmarray);
-        }
-
-        n = 0;
-
-        /* Load up mmarray[] with mm reference for each task in cpuset. */
-        cgroup_iter_start(cs->css.cgroup, &it);
-        while ((p = cgroup_iter_next(cs->css.cgroup, &it))) {
-                struct mm_struct *mm;
-
-                if (n >= ntasks) {
-                        printk(KERN_WARNING
-                                "Cpuset mempolicy rebind incomplete.\n");
-                        break;
-                }
-                mm = get_task_mm(p);
-                if (!mm)
-                        continue;
-                mmarray[n++] = mm;
-        }
-        cgroup_iter_end(cs->css.cgroup, &it);
-        read_unlock(&tasklist_lock);
+        scan.cg = cs->css.cgroup;
+        scan.test_task = NULL;
+        scan.process_task = cpuset_change_nodemask;
+        scan.heap = heap;
+        scan.data = (nodemask_t *)oldmem;
 
         /*
-         * Now that we've dropped the tasklist spinlock, we can
-         * rebind the vma mempolicies of each mm in mmarray[] to their
-         * new cpuset, and release that mm.  The mpol_rebind_mm()
-         * call takes mmap_sem, which we couldn't take while holding
-         * tasklist_lock.  Forks can happen again now - the mpol_dup()
-         * cpuset_being_rebound check will catch such forks, and rebind
-         * their vma mempolicies too.  Because we still hold the global
-         * cgroup_mutex, we know that no other rebind effort will
-         * be contending for the global variable cpuset_being_rebound.
+         * The mpol_rebind_mm() call takes mmap_sem, which we couldn't
+         * take while holding tasklist_lock.  Forks can happen - the
+         * mpol_dup() cpuset_being_rebound check will catch such forks,
+         * and rebind their vma mempolicies too.  Because we still hold
+         * the global cgroup_mutex, we know that no other rebind effort
+         * will be contending for the global variable cpuset_being_rebound.
          * It's ok if we rebind the same mm twice; mpol_rebind_mm()
          * is idempotent.  Also migrate pages in each mm to new nodes.
          */
-        migrate = is_memory_migrate(cs);
-        for (i = 0; i < n; i++) {
-                struct mm_struct *mm = mmarray[i];
-
-                mpol_rebind_mm(mm, &cs->mems_allowed);
-                if (migrate)
-                        cpuset_migrate_mm(mm, oldmem, &cs->mems_allowed);
-                mmput(mm);
-        }
+        cgroup_scan_tasks(&scan);
 
         /* We're done rebinding vmas to this cpuset's new mems_allowed. */
-        kfree(mmarray);
         cpuset_being_rebound = NULL;
-        retval = 0;
-done:
-        return retval;
 }
 
 /*
@@ -1141,6 +1119,7 @@ static int update_nodemask(struct cpuset *cs, struct cpuset *trialcs,
 {
         nodemask_t oldmem;
         int retval;
+        struct ptr_heap heap;
 
         /*
          * top_cpuset.mems_allowed tracks node_stats[N_HIGH_MEMORY];
@@ -1175,12 +1154,18 @@ static int update_nodemask(struct cpuset *cs, struct cpuset *trialcs,
         if (retval < 0)
                 goto done;
 
+        retval = heap_init(&heap, PAGE_SIZE, GFP_KERNEL, NULL);
+        if (retval < 0)
+                goto done;
+
         mutex_lock(&callback_mutex);
         cs->mems_allowed = trialcs->mems_allowed;
         cs->mems_generation = cpuset_mems_generation++;
         mutex_unlock(&callback_mutex);
 
-        retval = update_tasks_nodemask(cs, &oldmem);
+        update_tasks_nodemask(cs, &oldmem, &heap);
+
+        heap_free(&heap);
 done:
         return retval;
 }
@@ -1192,8 +1177,10 @@ int current_cpuset_is_being_rebound(void)
 
 static int update_relax_domain_level(struct cpuset *cs, s64 val)
 {
+#ifdef CONFIG_SMP
         if (val < -1 || val >= SD_LV_MAX)
                 return -EINVAL;
+#endif
 
         if (val != cs->relax_domain_level) {
                 cs->relax_domain_level = val;
@@ -1355,19 +1342,22 @@ static int cpuset_can_attach(struct cgroup_subsys *ss,
                              struct cgroup *cont, struct task_struct *tsk)
 {
         struct cpuset *cs = cgroup_cs(cont);
-        int ret = 0;
 
         if (cpumask_empty(cs->cpus_allowed) || nodes_empty(cs->mems_allowed))
                 return -ENOSPC;
 
-        if (tsk->flags & PF_THREAD_BOUND) {
-                mutex_lock(&callback_mutex);
-                if (!cpumask_equal(&tsk->cpus_allowed, cs->cpus_allowed))
-                        ret = -EINVAL;
-                mutex_unlock(&callback_mutex);
-        }
+        /*
+         * Kthreads bound to specific cpus cannot be moved to a new cpuset; we
+         * cannot change their cpu affinity and isolating such threads by their
+         * set of allowed nodes is unnecessary.  Thus, cpusets are not
+         * applicable for such threads.  This prevents checking for success of
+         * set_cpus_allowed_ptr() on all attached tasks before cpus_allowed may
+         * be changed.
+         */
+        if (tsk->flags & PF_THREAD_BOUND)
+                return -EINVAL;
 
-        return ret < 0 ? ret : security_task_setscheduler(tsk, 0, NULL);
+        return security_task_setscheduler(tsk, 0, NULL);
 }
 
 static void cpuset_attach(struct cgroup_subsys *ss,
@@ -1706,6 +1696,7 @@ static struct cftype files[] = {
                 .read_u64 = cpuset_read_u64,
                 .write_u64 = cpuset_write_u64,
                 .private = FILE_MEMORY_PRESSURE,
+                .mode = S_IRUGO,
         },
 
         {
@@ -1913,10 +1904,9 @@ int __init cpuset_init(void)
 static void cpuset_do_move_task(struct task_struct *tsk,
                                 struct cgroup_scanner *scan)
 {
-        struct cpuset_hotplug_scanner *chsp;
+        struct cgroup *new_cgroup = scan->data;
 
-        chsp = container_of(scan, struct cpuset_hotplug_scanner, scan);
-        cgroup_attach_task(chsp->to, tsk);
+        cgroup_attach_task(new_cgroup, tsk);
 }
 
 /**
@@ -1932,15 +1922,15 @@ static void cpuset_do_move_task(struct task_struct *tsk,
  */
 static void move_member_tasks_to_cpuset(struct cpuset *from, struct cpuset *to)
 {
-        struct cpuset_hotplug_scanner scan;
+        struct cgroup_scanner scan;
 
-        scan.scan.cg = from->css.cgroup;
-        scan.scan.test_task = NULL; /* select all tasks in cgroup */
-        scan.scan.process_task = cpuset_do_move_task;
-        scan.scan.heap = NULL;
-        scan.to = to->css.cgroup;
+        scan.cg = from->css.cgroup;
+        scan.test_task = NULL; /* select all tasks in cgroup */
+        scan.process_task = cpuset_do_move_task;
+        scan.heap = NULL;
+        scan.data = to->css.cgroup;
 
-        if (cgroup_scan_tasks(&scan.scan))
+        if (cgroup_scan_tasks(&scan))
                 printk(KERN_ERR "move_member_tasks_to_cpuset: "
                                 "cgroup_scan_tasks failed\n");
 }
@@ -2033,7 +2023,7 @@ static void scan_for_empty_cpusets(struct cpuset *root)
                         remove_tasks_in_empty_cpuset(cp);
                 else {
                         update_tasks_cpumask(cp, NULL);
-                        update_tasks_nodemask(cp, &oldmems);
+                        update_tasks_nodemask(cp, &oldmems, NULL);
                 }
         }
 }
@@ -2069,7 +2059,9 @@ static int cpuset_track_online_cpus(struct notifier_block *unused_nb,
         }
 
         cgroup_lock();
+        mutex_lock(&callback_mutex);
         cpumask_copy(top_cpuset.cpus_allowed, cpu_online_mask);
+        mutex_unlock(&callback_mutex);
         scan_for_empty_cpusets(&top_cpuset);
         ndoms = generate_sched_domains(&doms, &attr);
         cgroup_unlock();
@@ -2092,11 +2084,12 @@ static int cpuset_track_online_nodes(struct notifier_block *self,
         cgroup_lock();
         switch (action) {
         case MEM_ONLINE:
-                top_cpuset.mems_allowed = node_states[N_HIGH_MEMORY];
-                break;
         case MEM_OFFLINE:
+                mutex_lock(&callback_mutex);
                 top_cpuset.mems_allowed = node_states[N_HIGH_MEMORY];
-                scan_for_empty_cpusets(&top_cpuset);
+                mutex_unlock(&callback_mutex);
+                if (action == MEM_OFFLINE)
+                        scan_for_empty_cpusets(&top_cpuset);
                 break;
         default:
                 break;
@@ -2206,26 +2199,24 @@ static const struct cpuset *nearest_hardwall_ancestor(const struct cpuset *cs)
 }
 
 /**
- * cpuset_zone_allowed_softwall - Can we allocate on zone z's memory node?
- * @z: is this zone on an allowed node?
+ * cpuset_node_allowed_softwall - Can we allocate on a memory node?
+ * @node: is this an allowed node?
  * @gfp_mask: memory allocation flags
  *
- * If we're in interrupt, yes, we can always allocate.  If
- * __GFP_THISNODE is set, yes, we can always allocate.  If zone
- * z's node is in our tasks mems_allowed, yes.  If it's not a
- * __GFP_HARDWALL request and this zone's nodes is in the nearest
- * hardwalled cpuset ancestor to this tasks cpuset, yes.
- * If the task has been OOM killed and has access to memory reserves
- * as specified by the TIF_MEMDIE flag, yes.
+ * If we're in interrupt, yes, we can always allocate.  If __GFP_THISNODE is
+ * set, yes, we can always allocate.  If node is in our task's mems_allowed,
+ * yes.  If it's not a __GFP_HARDWALL request and this node is in the nearest
+ * hardwalled cpuset ancestor to this task's cpuset, yes.  If the task has been
+ * OOM killed and has access to memory reserves as specified by the TIF_MEMDIE
+ * flag, yes.
  * Otherwise, no.
  *
- * If __GFP_HARDWALL is set, cpuset_zone_allowed_softwall()
- * reduces to cpuset_zone_allowed_hardwall().  Otherwise,
- * cpuset_zone_allowed_softwall() might sleep, and might allow a zone
- * from an enclosing cpuset.
+ * If __GFP_HARDWALL is set, cpuset_node_allowed_softwall() reduces to
+ * cpuset_node_allowed_hardwall().  Otherwise, cpuset_node_allowed_softwall()
+ * might sleep, and might allow a node from an enclosing cpuset.
  *
- * cpuset_zone_allowed_hardwall() only handles the simpler case of
- * hardwall cpusets, and never sleeps.
+ * cpuset_node_allowed_hardwall() only handles the simpler case of hardwall
+ * cpusets, and never sleeps.
  *
  * The __GFP_THISNODE placement logic is really handled elsewhere,
  * by forcibly using a zonelist starting at a specified node, and by
@@ -2264,20 +2255,17 @@ static const struct cpuset *nearest_hardwall_ancestor(const struct cpuset *cs)
  *      GFP_USER     - only nodes in current tasks mems allowed ok.
  *
  * Rule:
- *    Don't call cpuset_zone_allowed_softwall if you can't sleep, unless you
+ *    Don't call cpuset_node_allowed_softwall if you can't sleep, unless you
  *    pass in the __GFP_HARDWALL flag set in gfp_flag, which disables
  *    the code that might scan up ancestor cpusets and sleep.
  */
-
-int __cpuset_zone_allowed_softwall(struct zone *z, gfp_t gfp_mask)
+int __cpuset_node_allowed_softwall(int node, gfp_t gfp_mask)
 {
-        int node;                       /* node that zone z is on */
         const struct cpuset *cs;        /* current cpuset ancestors */
         int allowed;                    /* is allocation in zone z allowed? */
 
         if (in_interrupt() || (gfp_mask & __GFP_THISNODE))
                 return 1;
-        node = zone_to_nid(z);
         might_sleep_if(!(gfp_mask & __GFP_HARDWALL));
         if (node_isset(node, current->mems_allowed))
                 return 1;
@@ -2306,15 +2294,15 @@ int __cpuset_zone_allowed_softwall(struct zone *z, gfp_t gfp_mask)
 }
 
 /*
- * cpuset_zone_allowed_hardwall - Can we allocate on zone z's memory node?
- * @z: is this zone on an allowed node?
+ * cpuset_node_allowed_hardwall - Can we allocate on a memory node?
+ * @node: is this an allowed node?
  * @gfp_mask: memory allocation flags
  *
- * If we're in interrupt, yes, we can always allocate.
- * If __GFP_THISNODE is set, yes, we can always allocate.  If zone
- * z's node is in our tasks mems_allowed, yes.   If the task has been
- * OOM killed and has access to memory reserves as specified by the
- * TIF_MEMDIE flag, yes.  Otherwise, no.
+ * If we're in interrupt, yes, we can always allocate.  If __GFP_THISNODE is
+ * set, yes, we can always allocate.  If node is in our task's mems_allowed,
+ * yes.  If the task has been OOM killed and has access to memory reserves as
+ * specified by the TIF_MEMDIE flag, yes.
+ * Otherwise, no.
  *
  * The __GFP_THISNODE placement logic is really handled elsewhere,
  * by forcibly using a zonelist starting at a specified node, and by
@@ -2322,20 +2310,16 @@ int __cpuset_zone_allowed_softwall(struct zone *z, gfp_t gfp_mask)
  * any node on the zonelist except the first.  By the time any such
  * calls get to this routine, we should just shut up and say 'yes'.
  *
- * Unlike the cpuset_zone_allowed_softwall() variant, above,
- * this variant requires that the zone be in the current tasks
+ * Unlike the cpuset_node_allowed_softwall() variant, above,
+ * this variant requires that the node be in the current task's
  * mems_allowed or that we're in interrupt.  It does not scan up the
  * cpuset hierarchy for the nearest enclosing mem_exclusive cpuset.
  * It never sleeps.
  */
-
-int __cpuset_zone_allowed_hardwall(struct zone *z, gfp_t gfp_mask)
+int __cpuset_node_allowed_hardwall(int node, gfp_t gfp_mask)
 {
-        int node;                       /* node that zone z is on */
-
         if (in_interrupt() || (gfp_mask & __GFP_THISNODE))
                 return 1;
-        node = zone_to_nid(z);
         if (node_isset(node, current->mems_allowed))
                 return 1;
         /*
diff --git a/kernel/exec_domain.c b/kernel/exec_domain.c
index 667c841c2952..c35452cadded 100644
--- a/kernel/exec_domain.c
+++ b/kernel/exec_domain.c
@@ -18,6 +18,7 @@
 #include <linux/syscalls.h>
 #include <linux/sysctl.h>
 #include <linux/types.h>
+#include <linux/fs_struct.h>
 
 
 static void default_handler(int, struct pt_regs *);
@@ -145,28 +146,6 @@ __set_personality(u_long personality)
                 return 0;
         }
 
-        if (atomic_read(&current->fs->count) != 1) {
-                struct fs_struct *fsp, *ofsp;
-
-                fsp = copy_fs_struct(current->fs);
-                if (fsp == NULL) {
-                        module_put(ep->module);
-                        return -ENOMEM;
-                }
-
-                task_lock(current);
-                ofsp = current->fs;
-                current->fs = fsp;
-                task_unlock(current);
-
-                put_fs_struct(ofsp);
-        }
-
-        /*
-         * At that point we are guaranteed to be the sole owner of
-         * current->fs.
-         */
-
         current->personality = personality;
         oep = current_thread_info()->exec_domain;
         current_thread_info()->exec_domain = ep;
diff --git a/kernel/exit.c b/kernel/exit.c
index 167e1e3ad7c6..6686ed1e4aa3 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -46,6 +46,7 @@
 #include <linux/blkdev.h>
 #include <linux/task_io_accounting_ops.h>
 #include <linux/tracehook.h>
+#include <linux/fs_struct.h>
 #include <linux/init_task.h>
 #include <trace/sched.h>
 
@@ -61,11 +62,6 @@ DEFINE_TRACE(sched_process_wait);
 
 static void exit_mm(struct task_struct * tsk);
 
-static inline int task_detached(struct task_struct *p)
-{
-        return p->exit_signal == -1;
-}
-
 static void __unhash_process(struct task_struct *p)
 {
         nr_threads--;
@@ -362,16 +358,12 @@ static void reparent_to_kthreadd(void)
 void __set_special_pids(struct pid *pid)
 {
         struct task_struct *curr = current->group_leader;
-        pid_t nr = pid_nr(pid);
 
-        if (task_session(curr) != pid) {
+        if (task_session(curr) != pid)
                 change_pid(curr, PIDTYPE_SID, pid);
-                set_task_session(curr, nr);
-        }
-        if (task_pgrp(curr) != pid) {
+
+        if (task_pgrp(curr) != pid)
                 change_pid(curr, PIDTYPE_PGID, pid);
-                set_task_pgrp(curr, nr);
-        }
 }
 
 static void set_special_pids(struct pid *pid)
@@ -429,7 +421,6 @@ EXPORT_SYMBOL(disallow_signal);
 void daemonize(const char *name, ...)
 {
         va_list args;
-        struct fs_struct *fs;
         sigset_t blocked;
 
         va_start(args, name);
@@ -462,11 +453,7 @@ void daemonize(const char *name, ...)
 
         /* Become as one with the init task */
 
-        exit_fs(current);       /* current->fs->count--; */
-        fs = init_task.fs;
-        current->fs = fs;
-        atomic_inc(&fs->count);
-
+        daemonize_fs_struct();
         exit_files(current);
         current->files = init_task.files;
         atomic_inc(&current->files->count);
@@ -565,30 +552,6 @@ void exit_files(struct task_struct *tsk)
         }
 }
 
-void put_fs_struct(struct fs_struct *fs)
-{
-        /* No need to hold fs->lock if we are killing it */
-        if (atomic_dec_and_test(&fs->count)) {
-                path_put(&fs->root);
-                path_put(&fs->pwd);
-                kmem_cache_free(fs_cachep, fs);
-        }
-}
-
-void exit_fs(struct task_struct *tsk)
-{
-        struct fs_struct * fs = tsk->fs;
-
-        if (fs) {
-                task_lock(tsk);
-                tsk->fs = NULL;
-                task_unlock(tsk);
-                put_fs_struct(fs);
-        }
-}
-
-EXPORT_SYMBOL_GPL(exit_fs);
-
 #ifdef CONFIG_MM_OWNER
 /*
  * Task p is exiting and it owned mm, lets find a new owner for it
@@ -732,119 +695,6 @@ static void exit_mm(struct task_struct * tsk)
 }
 
 /*
- * Return nonzero if @parent's children should reap themselves.
- *
- * Called with write_lock_irq(&tasklist_lock) held.
- */
-static int ignoring_children(struct task_struct *parent)
-{
-        int ret;
-        struct sighand_struct *psig = parent->sighand;
-        unsigned long flags;
-        spin_lock_irqsave(&psig->siglock, flags);
-        ret = (psig->action[SIGCHLD-1].sa.sa_handler == SIG_IGN ||
-               (psig->action[SIGCHLD-1].sa.sa_flags & SA_NOCLDWAIT));
-        spin_unlock_irqrestore(&psig->siglock, flags);
-        return ret;
-}
-
-/*
- * Detach all tasks we were using ptrace on.
- * Any that need to be release_task'd are put on the @dead list.
- *
- * Called with write_lock(&tasklist_lock) held.
- */
-static void ptrace_exit(struct task_struct *parent, struct list_head *dead)
-{
-        struct task_struct *p, *n;
-        int ign = -1;
-
-        list_for_each_entry_safe(p, n, &parent->ptraced, ptrace_entry) {
-                __ptrace_unlink(p);
-
-                if (p->exit_state != EXIT_ZOMBIE)
-                        continue;
-
-                /*
-                 * If it's a zombie, our attachedness prevented normal
-                 * parent notification or self-reaping.  Do notification
-                 * now if it would have happened earlier.  If it should
-                 * reap itself, add it to the @dead list.  We can't call
-                 * release_task() here because we already hold tasklist_lock.
-                 *
-                 * If it's our own child, there is no notification to do.
-                 * But if our normal children self-reap, then this child
-                 * was prevented by ptrace and we must reap it now.
-                 */
-                if (!task_detached(p) && thread_group_empty(p)) {
-                        if (!same_thread_group(p->real_parent, parent))
-                                do_notify_parent(p, p->exit_signal);
-                        else {
-                                if (ign < 0)
-                                        ign = ignoring_children(parent);
-                                if (ign)
-                                        p->exit_signal = -1;
-                        }
-                }
-
-                if (task_detached(p)) {
-                        /*
-                         * Mark it as in the process of being reaped.
-                         */
-                        p->exit_state = EXIT_DEAD;
-                        list_add(&p->ptrace_entry, dead);
-                }
-        }
-}
-
-/*
- * Finish up exit-time ptrace cleanup.
- *
- * Called without locks.
- */
-static void ptrace_exit_finish(struct task_struct *parent,
-                               struct list_head *dead)
-{
-        struct task_struct *p, *n;
-
-        BUG_ON(!list_empty(&parent->ptraced));
-
-        list_for_each_entry_safe(p, n, dead, ptrace_entry) {
-                list_del_init(&p->ptrace_entry);
-                release_task(p);
-        }
-}
-
-static void reparent_thread(struct task_struct *p, struct task_struct *father)
-{
-        if (p->pdeath_signal)
-                /* We already hold the tasklist_lock here.  */
-                group_send_sig_info(p->pdeath_signal, SEND_SIG_NOINFO, p);
-
-        list_move_tail(&p->sibling, &p->real_parent->children);
-
-        /* If this is a threaded reparent there is no need to
-         * notify anyone anything has happened.
-         */
-        if (same_thread_group(p->real_parent, father))
-                return;
-
-        /* We don't want people slaying init.  */
-        if (!task_detached(p))
-                p->exit_signal = SIGCHLD;
-
-        /* If we'd notified the old parent about this child's death,
-         * also notify the new parent.
-         */
-        if (!ptrace_reparented(p) &&
-            p->exit_state == EXIT_ZOMBIE &&
-            !task_detached(p) && thread_group_empty(p))
-                do_notify_parent(p, p->exit_signal);
-
-        kill_orphaned_pgrp(p, father);
-}
-
-/*
  * When we die, we re-parent all our children.
  * Try to give them to another thread in our thread
  * group, and if no such member exists, give it to
@@ -883,17 +733,51 @@ static struct task_struct *find_new_reaper(struct task_struct *father)
         return pid_ns->child_reaper;
 }
 
+/*
+* Any that need to be release_task'd are put on the @dead list.
+ */
+static void reparent_thread(struct task_struct *father, struct task_struct *p,
+                                struct list_head *dead)
+{
+        if (p->pdeath_signal)
+                group_send_sig_info(p->pdeath_signal, SEND_SIG_NOINFO, p);
+
+        list_move_tail(&p->sibling, &p->real_parent->children);
+
+        if (task_detached(p))
+                return;
+        /*
+         * If this is a threaded reparent there is no need to
+         * notify anyone anything has happened.
+         */
+        if (same_thread_group(p->real_parent, father))
+                return;
+
+        /* We don't want people slaying init.  */
+        p->exit_signal = SIGCHLD;
+
+        /* If it has exited notify the new parent about this child's death. */
+        if (!p->ptrace &&
+            p->exit_state == EXIT_ZOMBIE && thread_group_empty(p)) {
+                do_notify_parent(p, p->exit_signal);
+                if (task_detached(p)) {
+                        p->exit_state = EXIT_DEAD;
+                        list_move_tail(&p->sibling, dead);
+                }
+        }
+
+        kill_orphaned_pgrp(p, father);
+}
+
 static void forget_original_parent(struct task_struct *father)
 {
         struct task_struct *p, *n, *reaper;
-        LIST_HEAD(ptrace_dead);
+        LIST_HEAD(dead_children);
+
+        exit_ptrace(father);
 
         write_lock_irq(&tasklist_lock);
         reaper = find_new_reaper(father);
-        /*
-         * First clean up ptrace if we were using it.
-         */
-        ptrace_exit(father, &ptrace_dead);
 
         list_for_each_entry_safe(p, n, &father->children, sibling) {
                 p->real_parent = reaper;
@@ -901,13 +785,16 @@ static void forget_original_parent(struct task_struct *father)
                         BUG_ON(p->ptrace);
                         p->parent = p->real_parent;
                 }
-                reparent_thread(p, father);
+                reparent_thread(father, p, &dead_children);
         }
-
         write_unlock_irq(&tasklist_lock);
+
         BUG_ON(!list_empty(&father->children));
 
-        ptrace_exit_finish(father, &ptrace_dead);
+        list_for_each_entry_safe(p, n, &dead_children, sibling) {
+                list_del_init(&p->sibling);
+                release_task(p);
+        }
 }
 
 /*
@@ -1417,6 +1304,18 @@ static int wait_task_zombie(struct task_struct *p, int options,
         return retval;
 }
 
+static int *task_stopped_code(struct task_struct *p, bool ptrace)
+{
+        if (ptrace) {
+                if (task_is_stopped_or_traced(p))
+                        return &p->exit_code;
+        } else {
+                if (p->signal->flags & SIGNAL_STOP_STOPPED)
+                        return &p->signal->group_exit_code;
+        }
+        return NULL;
+}
+
 /*
  * Handle sys_wait4 work for one task in state TASK_STOPPED.  We hold
  * read_lock(&tasklist_lock) on entry.  If we return zero, we still hold
@@ -1427,7 +1326,7 @@ static int wait_task_stopped(int ptrace, struct task_struct *p,
                              int options, struct siginfo __user *infop,
                              int __user *stat_addr, struct rusage __user *ru)
 {
-        int retval, exit_code, why;
+        int retval, exit_code, *p_code, why;
         uid_t uid = 0; /* unneeded, required by compiler */
         pid_t pid;
 
@@ -1437,22 +1336,16 @@ static int wait_task_stopped(int ptrace, struct task_struct *p,
         exit_code = 0;
         spin_lock_irq(&p->sighand->siglock);
 
-        if (unlikely(!task_is_stopped_or_traced(p)))
-                goto unlock_sig;
-
-        if (!ptrace && p->signal->group_stop_count > 0)
-                /*
-                 * A group stop is in progress and this is the group leader.
-                 * We won't report until all threads have stopped.
-                 */
+        p_code = task_stopped_code(p, ptrace);
+        if (unlikely(!p_code))
                 goto unlock_sig;
 
-        exit_code = p->exit_code;
+        exit_code = *p_code;
         if (!exit_code)
                 goto unlock_sig;
 
         if (!unlikely(options & WNOWAIT))
-                p->exit_code = 0;
+                *p_code = 0;
 
         /* don't need the RCU readlock here as we're holding a spinlock */
         uid = __task_cred(p)->uid;
@@ -1608,7 +1501,7 @@ static int wait_consider_task(struct task_struct *parent, int ptrace,
          */
         *notask_error = 0;
 
-        if (task_is_stopped_or_traced(p))
+        if (task_stopped_code(p, ptrace))
                 return wait_task_stopped(ptrace, p, options,
                                          infop, stat_addr, ru);
 
@@ -1812,7 +1705,7 @@ SYSCALL_DEFINE4(wait4, pid_t, upid, int __user *, stat_addr,
                 pid = find_get_pid(-upid);
         } else if (upid == 0) {
                 type = PIDTYPE_PGID;
-                pid = get_pid(task_pgrp(current));
+                pid = get_task_pid(current, PIDTYPE_PGID);
         } else /* upid > 0 */ {
                 type = PIDTYPE_PID;
                 pid = find_get_pid(upid);
diff --git a/kernel/fork.c b/kernel/fork.c
index 6715ebc3761d..660c2b8765bc 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -60,6 +60,7 @@
 #include <linux/tty.h>
 #include <linux/proc_fs.h>
 #include <linux/blkdev.h>
+#include <linux/fs_struct.h>
 #include <trace/sched.h>
 #include <linux/magic.h>
 
@@ -284,7 +285,7 @@ static int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
         mm->free_area_cache = oldmm->mmap_base;
         mm->cached_hole_size = ~0UL;
         mm->map_count = 0;
-        cpus_clear(mm->cpu_vm_mask);
+        cpumask_clear(mm_cpumask(mm));
         mm->mm_rb = RB_ROOT;
         rb_link = &mm->mm_rb.rb_node;
         rb_parent = NULL;
@@ -681,38 +682,21 @@ fail_nomem:
         return retval;
 }
 
-static struct fs_struct *__copy_fs_struct(struct fs_struct *old)
-{
-        struct fs_struct *fs = kmem_cache_alloc(fs_cachep, GFP_KERNEL);
-        /* We don't need to lock fs - think why ;-) */
-        if (fs) {
-                atomic_set(&fs->count, 1);
-                rwlock_init(&fs->lock);
-                fs->umask = old->umask;
-                read_lock(&old->lock);
-                fs->root = old->root;
-                path_get(&old->root);
-                fs->pwd = old->pwd;
-                path_get(&old->pwd);
-                read_unlock(&old->lock);
-        }
-        return fs;
-}
-
-struct fs_struct *copy_fs_struct(struct fs_struct *old)
-{
-        return __copy_fs_struct(old);
-}
-
-EXPORT_SYMBOL_GPL(copy_fs_struct);
-
 static int copy_fs(unsigned long clone_flags, struct task_struct *tsk)
 {
+        struct fs_struct *fs = current->fs;
         if (clone_flags & CLONE_FS) {
-                atomic_inc(&current->fs->count);
+                /* tsk->fs is already what we want */
+                write_lock(&fs->lock);
+                if (fs->in_exec) {
+                        write_unlock(&fs->lock);
+                        return -EAGAIN;
+                }
+                fs->users++;
+                write_unlock(&fs->lock);
                 return 0;
         }
-        tsk->fs = __copy_fs_struct(current->fs);
+        tsk->fs = copy_fs_struct(fs);
         if (!tsk->fs)
                 return -ENOMEM;
         return 0;
@@ -841,6 +825,8 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
         atomic_set(&sig->live, 1);
         init_waitqueue_head(&sig->wait_chldexit);
         sig->flags = 0;
+        if (clone_flags & CLONE_NEWPID)
+                sig->flags |= SIGNAL_UNKILLABLE;
         sig->group_exit_code = 0;
         sig->group_exit_task = NULL;
         sig->group_stop_count = 0;
@@ -1125,7 +1111,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
                 goto bad_fork_cleanup_mm;
         if ((retval = copy_io(clone_flags, p)))
                 goto bad_fork_cleanup_namespaces;
-        retval = copy_thread(0, clone_flags, stack_start, stack_size, p, regs);
+        retval = copy_thread(clone_flags, stack_start, stack_size, p, regs);
         if (retval)
                 goto bad_fork_cleanup_io;
 
@@ -1263,8 +1249,6 @@ static struct task_struct *copy_process(unsigned long clone_flags,
                         p->signal->leader_pid = pid;
                         tty_kref_put(p->signal->tty);
                         p->signal->tty = tty_kref_get(current->signal->tty);
-                        set_task_pgrp(p, task_pgrp_nr(current));
-                        set_task_session(p, task_session_nr(current));
                         attach_pid(p, PIDTYPE_PGID, task_pgrp(current));
                         attach_pid(p, PIDTYPE_SID, task_session(current));
                         list_add_tail_rcu(&p->tasks, &init_task.tasks);
@@ -1488,6 +1472,7 @@ void __init proc_caches_init(void)
         mm_cachep = kmem_cache_create("mm_struct",
                         sizeof(struct mm_struct), ARCH_MIN_MMSTRUCT_ALIGN,
                         SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL);
+        vm_area_cachep = KMEM_CACHE(vm_area_struct, SLAB_PANIC);
         mmap_init();
 }
 
@@ -1543,12 +1528,16 @@ static int unshare_fs(unsigned long unshare_flags, struct fs_struct **new_fsp)
 {
         struct fs_struct *fs = current->fs;
 
-        if ((unshare_flags & CLONE_FS) &&
-            (fs && atomic_read(&fs->count) > 1)) {
-                *new_fsp = __copy_fs_struct(current->fs);
-                if (!*new_fsp)
-                        return -ENOMEM;
-        }
+        if (!(unshare_flags & CLONE_FS) || !fs)
+                return 0;
+
+        /* don't need lock here; in the worst case we'll do useless copy */
+        if (fs->users == 1)
+                return 0;
+
+        *new_fsp = copy_fs_struct(fs);
+        if (!*new_fsp)
+                return -ENOMEM;
 
         return 0;
 }
@@ -1664,8 +1653,13 @@ SYSCALL_DEFINE1(unshare, unsigned long, unshare_flags)
 
                 if (new_fs) {
                         fs = current->fs;
+                        write_lock(&fs->lock);
                         current->fs = new_fs;
-                        new_fs = fs;
+                        if (--fs->users)
+                                new_fs = NULL;
+                        else
+                                new_fs = fs;
+                        write_unlock(&fs->lock);
                 }
 
                 if (new_mm) {
@@ -1704,7 +1698,7 @@ bad_unshare_cleanup_sigh:
 
 bad_unshare_cleanup_fs:
         if (new_fs)
-                put_fs_struct(new_fs);
+                free_fs_struct(new_fs);
 
 bad_unshare_cleanup_thread:
 bad_unshare_out:
diff --git a/kernel/irq/Makefile b/kernel/irq/Makefile
index 4dd5b1edac98..3394f8f52964 100644
--- a/kernel/irq/Makefile
+++ b/kernel/irq/Makefile
@@ -4,3 +4,4 @@ obj-$(CONFIG_GENERIC_IRQ_PROBE) += autoprobe.o
 obj-$(CONFIG_PROC_FS) += proc.o
 obj-$(CONFIG_GENERIC_PENDING_IRQ) += migration.o
 obj-$(CONFIG_NUMA_MIGRATE_IRQ_DESC) += numa_migrate.o
+obj-$(CONFIG_PM_SLEEP) += pm.o
diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h
index ee1aa9f8e8b9..01ce20eab38f 100644
--- a/kernel/irq/internals.h
+++ b/kernel/irq/internals.h
@@ -12,6 +12,8 @@ extern void compat_irq_chip_set_default_handler(struct irq_desc *desc);
 
 extern int __irq_set_trigger(struct irq_desc *desc, unsigned int irq,
                 unsigned long flags);
+extern void __disable_irq(struct irq_desc *desc, unsigned int irq, bool susp);
+extern void __enable_irq(struct irq_desc *desc, unsigned int irq, bool resume);
 
 extern struct lock_class_key irq_desc_lock_class;
 extern void init_kstat_irqs(struct irq_desc *desc, int cpu, int nr);
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 6458e99984c0..1516ab77355c 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -162,6 +162,20 @@ static inline int setup_affinity(unsigned int irq, struct irq_desc *desc)
 }
 #endif
 
+void __disable_irq(struct irq_desc *desc, unsigned int irq, bool suspend)
+{
+        if (suspend) {
+                if (!desc->action || (desc->action->flags & IRQF_TIMER))
+                        return;
+                desc->status |= IRQ_SUSPENDED;
+        }
+
+        if (!desc->depth++) {
+                desc->status |= IRQ_DISABLED;
+                desc->chip->disable(irq);
+        }
+}
+
 /**
  *      disable_irq_nosync - disable an irq without waiting
  *      @irq: Interrupt to disable
@@ -182,10 +196,7 @@ void disable_irq_nosync(unsigned int irq)
                 return;
 
         spin_lock_irqsave(&desc->lock, flags);
-        if (!desc->depth++) {
-                desc->status |= IRQ_DISABLED;
-                desc->chip->disable(irq);
-        }
+        __disable_irq(desc, irq, false);
         spin_unlock_irqrestore(&desc->lock, flags);
 }
 EXPORT_SYMBOL(disable_irq_nosync);
@@ -215,15 +226,21 @@ void disable_irq(unsigned int irq)
 }
 EXPORT_SYMBOL(disable_irq);
 
-static void __enable_irq(struct irq_desc *desc, unsigned int irq)
+void __enable_irq(struct irq_desc *desc, unsigned int irq, bool resume)
 {
+        if (resume)
+                desc->status &= ~IRQ_SUSPENDED;
+
         switch (desc->depth) {
         case 0:
+ err_out:
                 WARN(1, KERN_WARNING "Unbalanced enable for IRQ %d\n", irq);
                 break;
         case 1: {
                 unsigned int status = desc->status & ~IRQ_DISABLED;
 
+                if (desc->status & IRQ_SUSPENDED)
+                        goto err_out;
                 /* Prevent probing on this irq: */
                 desc->status = status | IRQ_NOPROBE;
                 check_irq_resend(desc, irq);
@@ -253,7 +270,7 @@ void enable_irq(unsigned int irq)
                 return;
 
         spin_lock_irqsave(&desc->lock, flags);
-        __enable_irq(desc, irq);
+        __enable_irq(desc, irq, false);
         spin_unlock_irqrestore(&desc->lock, flags);
 }
 EXPORT_SYMBOL(enable_irq);
@@ -511,7 +528,7 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
          */
         if (shared && (desc->status & IRQ_SPURIOUS_DISABLED)) {
                 desc->status &= ~IRQ_SPURIOUS_DISABLED;
-                __enable_irq(desc, irq);
+                __enable_irq(desc, irq, false);
         }
 
         spin_unlock_irqrestore(&desc->lock, flags);
diff --git a/kernel/irq/pm.c b/kernel/irq/pm.c
new file mode 100644
index 000000000000..638d8bedec14
--- /dev/null
+++ b/kernel/irq/pm.c
@@ -0,0 +1,79 @@
+/*
+ * linux/kernel/irq/pm.c
+ *
+ * Copyright (C) 2009 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
+ *
+ * This file contains power management functions related to interrupts.
+ */
+
+#include <linux/irq.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+
+#include "internals.h"
+
+/**
+ * suspend_device_irqs - disable all currently enabled interrupt lines
+ *
+ * During system-wide suspend or hibernation device interrupts need to be
+ * disabled at the chip level and this function is provided for this purpose.
+ * It disables all interrupt lines that are enabled at the moment and sets the
+ * IRQ_SUSPENDED flag for them.
+ */
+void suspend_device_irqs(void)
+{
+        struct irq_desc *desc;
+        int irq;
+
+        for_each_irq_desc(irq, desc) {
+                unsigned long flags;
+
+                spin_lock_irqsave(&desc->lock, flags);
+                __disable_irq(desc, irq, true);
+                spin_unlock_irqrestore(&desc->lock, flags);
+        }
+
+        for_each_irq_desc(irq, desc)
+                if (desc->status & IRQ_SUSPENDED)
+                        synchronize_irq(irq);
+}
+EXPORT_SYMBOL_GPL(suspend_device_irqs);
+
+/**
+ * resume_device_irqs - enable interrupt lines disabled by suspend_device_irqs()
+ *
+ * Enable all interrupt lines previously disabled by suspend_device_irqs() that
+ * have the IRQ_SUSPENDED flag set.
+ */
+void resume_device_irqs(void)
+{
+        struct irq_desc *desc;
+        int irq;
+
+        for_each_irq_desc(irq, desc) {
+                unsigned long flags;
+
+                if (!(desc->status & IRQ_SUSPENDED))
+                        continue;
+
+                spin_lock_irqsave(&desc->lock, flags);
+                __enable_irq(desc, irq, true);
+                spin_unlock_irqrestore(&desc->lock, flags);
+        }
+}
+EXPORT_SYMBOL_GPL(resume_device_irqs);
+
+/**
+ * check_wakeup_irqs - check if any wake-up interrupts are pending
+ */
+int check_wakeup_irqs(void)
+{
+        struct irq_desc *desc;
+        int irq;
+
+        for_each_irq_desc(irq, desc)
+                if ((desc->status & IRQ_WAKEUP) && (desc->status & IRQ_PENDING))
+                        return -EBUSY;
+
+        return 0;
+}
diff --git a/kernel/kexec.c b/kernel/kexec.c
index c7fd6692939d..5a758c6e4950 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -42,7 +42,7 @@
 note_buf_t* crash_notes;
 
 /* vmcoreinfo stuff */
-unsigned char vmcoreinfo_data[VMCOREINFO_BYTES];
+static unsigned char vmcoreinfo_data[VMCOREINFO_BYTES];
 u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4];
 size_t vmcoreinfo_size;
 size_t vmcoreinfo_max_size = sizeof(vmcoreinfo_data);
@@ -1409,6 +1409,7 @@ static int __init crash_save_vmcoreinfo_init(void)
         VMCOREINFO_OFFSET(list_head, prev);
         VMCOREINFO_OFFSET(vm_struct, addr);
         VMCOREINFO_LENGTH(zone.free_area, MAX_ORDER);
+        log_buf_kexec_setup();
         VMCOREINFO_LENGTH(free_area.free_list, MIGRATE_TYPES);
         VMCOREINFO_NUMBER(NR_FREE_PAGES);
         VMCOREINFO_NUMBER(PG_lru);
@@ -1450,11 +1451,7 @@ int kernel_kexec(void)
                 error = device_suspend(PMSG_FREEZE);
                 if (error)
                         goto Resume_console;
-                error = disable_nonboot_cpus();
-                if (error)
-                        goto Resume_devices;
                 device_pm_lock();
-                local_irq_disable();
                 /* At this point, device_suspend() has been called,
                  * but *not* device_power_down(). We *must*
                  * device_power_down() now.  Otherwise, drivers for
@@ -1464,12 +1461,15 @@ int kernel_kexec(void)
                  */
                 error = device_power_down(PMSG_FREEZE);
                 if (error)
-                        goto Enable_irqs;
-
+                        goto Resume_devices;
+                error = disable_nonboot_cpus();
+                if (error)
+                        goto Enable_cpus;
+                local_irq_disable();
                 /* Suspend system devices */
                 error = sysdev_suspend(PMSG_FREEZE);
                 if (error)
-                        goto Power_up_devices;
+                        goto Enable_irqs;
         } else
 #endif
         {
@@ -1483,13 +1483,13 @@ int kernel_kexec(void)
 #ifdef CONFIG_KEXEC_JUMP
         if (kexec_image->preserve_context) {
                 sysdev_resume();
- Power_up_devices:
-                device_power_up(PMSG_RESTORE);
  Enable_irqs:
                 local_irq_enable();
-                device_pm_unlock();
+ Enable_cpus:
                 enable_nonboot_cpus();
+                device_power_up(PMSG_RESTORE);
  Resume_devices:
+                device_pm_unlock();
                 device_resume(PMSG_RESTORE);
  Resume_console:
                 resume_console();
diff --git a/kernel/kmod.c b/kernel/kmod.c
index a27a5f64443d..f0c8f545180d 100644
--- a/kernel/kmod.c
+++ b/kernel/kmod.c
@@ -167,7 +167,7 @@ static int ____call_usermodehelper(void *data)
         }
 
         /* We can run anywhere, unlike our parent keventd(). */
-        set_cpus_allowed_ptr(current, CPU_MASK_ALL_PTR);
+        set_cpus_allowed_ptr(current, cpu_all_mask);
 
         /*
          * Our parent is keventd, which runs with elevated scheduling priority.
diff --git a/kernel/kthread.c b/kernel/kthread.c
index 4fbc456f393d..84bbadd4d021 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -110,7 +110,7 @@ static void create_kthread(struct kthread_create_info *create)
                  */
                 sched_setscheduler(create->result, SCHED_NORMAL, &param);
                 set_user_nice(create->result, KTHREAD_NICE_LEVEL);
-                set_cpus_allowed_ptr(create->result, CPU_MASK_ALL_PTR);
+                set_cpus_allowed_ptr(create->result, cpu_all_mask);
         }
         complete(&create->done);
 }
@@ -240,7 +240,7 @@ int kthreadd(void *unused)
         set_task_comm(tsk, "kthreadd");
         ignore_signals(tsk);
         set_user_nice(tsk, KTHREAD_NICE_LEVEL);
-        set_cpus_allowed_ptr(tsk, CPU_MASK_ALL_PTR);
+        set_cpus_allowed_ptr(tsk, cpu_all_mask);
 
         current->flags |= PF_NOFREEZE | PF_FREEZER_NOSIG;
 
diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index 06b0c3568f0b..3673a3f44d9d 100644
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -41,6 +41,7 @@
 #include <linux/utsname.h>
 #include <linux/hash.h>
 #include <linux/ftrace.h>
+#include <linux/stringify.h>
 
 #include <asm/sections.h>
 
@@ -310,12 +311,14 @@ EXPORT_SYMBOL(lockdep_on);
 #if VERBOSE
 # define HARDIRQ_VERBOSE        1
 # define SOFTIRQ_VERBOSE        1
+# define RECLAIM_VERBOSE        1
 #else
 # define HARDIRQ_VERBOSE        0
 # define SOFTIRQ_VERBOSE        0
+# define RECLAIM_VERBOSE        0
 #endif
 
-#if VERBOSE || HARDIRQ_VERBOSE || SOFTIRQ_VERBOSE
+#if VERBOSE || HARDIRQ_VERBOSE || SOFTIRQ_VERBOSE || RECLAIM_VERBOSE
 /*
  * Quick filtering for interesting events:
  */
@@ -443,17 +446,18 @@ atomic_t nr_find_usage_backwards_recursions;
  * Locking printouts:
  */
 
+#define __USAGE(__STATE)                                                \
+        [LOCK_USED_IN_##__STATE] = "IN-"__stringify(__STATE)"-W",       \
+        [LOCK_ENABLED_##__STATE] = __stringify(__STATE)"-ON-W",         \
+        [LOCK_USED_IN_##__STATE##_READ] = "IN-"__stringify(__STATE)"-R",\
+        [LOCK_ENABLED_##__STATE##_READ] = __stringify(__STATE)"-ON-R",
+
 static const char *usage_str[] =
 {
-        [LOCK_USED] =                   "initial-use ",
-        [LOCK_USED_IN_HARDIRQ] =        "in-hardirq-W",
-        [LOCK_USED_IN_SOFTIRQ] =        "in-softirq-W",
-        [LOCK_ENABLED_SOFTIRQS] =       "softirq-on-W",
-        [LOCK_ENABLED_HARDIRQS] =       "hardirq-on-W",
-        [LOCK_USED_IN_HARDIRQ_READ] =   "in-hardirq-R",
-        [LOCK_USED_IN_SOFTIRQ_READ] =   "in-softirq-R",
-        [LOCK_ENABLED_SOFTIRQS_READ] =  "softirq-on-R",
-        [LOCK_ENABLED_HARDIRQS_READ] =  "hardirq-on-R",
+#define LOCKDEP_STATE(__STATE) __USAGE(__STATE)
+#include "lockdep_states.h"
+#undef LOCKDEP_STATE
+        [LOCK_USED] = "INITIAL USE",
 };
 
 const char * __get_key_name(struct lockdep_subclass_key *key, char *str)
@@ -461,46 +465,45 @@ const char * __get_key_name(struct lockdep_subclass_key *key, char *str)
         return kallsyms_lookup((unsigned long)key, NULL, NULL, NULL, str);
 }
 
-void
-get_usage_chars(struct lock_class *class, char *c1, char *c2, char *c3, char *c4)
+static inline unsigned long lock_flag(enum lock_usage_bit bit)
 {
-        *c1 = '.', *c2 = '.', *c3 = '.', *c4 = '.';
-
-        if (class->usage_mask & LOCKF_USED_IN_HARDIRQ)
-                *c1 = '+';
-        else
-                if (class->usage_mask & LOCKF_ENABLED_HARDIRQS)
-                        *c1 = '-';
+        return 1UL << bit;
+}
 
-        if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ)
-                *c2 = '+';
-        else
-                if (class->usage_mask & LOCKF_ENABLED_SOFTIRQS)
-                        *c2 = '-';
+static char get_usage_char(struct lock_class *class, enum lock_usage_bit bit)
+{
+        char c = '.';
 
-        if (class->usage_mask & LOCKF_ENABLED_HARDIRQS_READ)
-                *c3 = '-';
-        if (class->usage_mask & LOCKF_USED_IN_HARDIRQ_READ) {
-                *c3 = '+';
-                if (class->usage_mask & LOCKF_ENABLED_HARDIRQS_READ)
-                        *c3 = '?';
+        if (class->usage_mask & lock_flag(bit + 2))
+                c = '+';
+        if (class->usage_mask & lock_flag(bit)) {
+                c = '-';
+                if (class->usage_mask & lock_flag(bit + 2))
+                        c = '?';
         }
 
-        if (class->usage_mask & LOCKF_ENABLED_SOFTIRQS_READ)
-                *c4 = '-';
-        if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ_READ) {
-                *c4 = '+';
-                if (class->usage_mask & LOCKF_ENABLED_SOFTIRQS_READ)
-                        *c4 = '?';
-        }
+        return c;
+}
+
+void get_usage_chars(struct lock_class *class, char usage[LOCK_USAGE_CHARS])
+{
+        int i = 0;
+
+#define LOCKDEP_STATE(__STATE)                                          \
+        usage[i++] = get_usage_char(class, LOCK_USED_IN_##__STATE);     \
+        usage[i++] = get_usage_char(class, LOCK_USED_IN_##__STATE##_READ);
+#include "lockdep_states.h"
+#undef LOCKDEP_STATE
+
+        usage[i] = '\0';
 }
 
 static void print_lock_name(struct lock_class *class)
 {
-        char str[KSYM_NAME_LEN], c1, c2, c3, c4;
+        char str[KSYM_NAME_LEN], usage[LOCK_USAGE_CHARS];
         const char *name;
 
-        get_usage_chars(class, &c1, &c2, &c3, &c4);
+        get_usage_chars(class, usage);
 
         name = class->name;
         if (!name) {
@@ -513,7 +516,7 @@ static void print_lock_name(struct lock_class *class)
                 if (class->subclass)
                         printk("/%d", class->subclass);
         }
-        printk("){%c%c%c%c}", c1, c2, c3, c4);
+        printk("){%s}", usage);
 }
 
 static void print_lockdep_cache(struct lockdep_map *lock)
@@ -1263,9 +1266,49 @@ check_usage(struct task_struct *curr, struct held_lock *prev,
                         bit_backwards, bit_forwards, irqclass);
 }
 
-static int
-check_prev_add_irq(struct task_struct *curr, struct held_lock *prev,
-                struct held_lock *next)
+static const char *state_names[] = {
+#define LOCKDEP_STATE(__STATE) \
+        __stringify(__STATE),
+#include "lockdep_states.h"
+#undef LOCKDEP_STATE
+};
+
+static const char *state_rnames[] = {
+#define LOCKDEP_STATE(__STATE) \
+        __stringify(__STATE)"-READ",
+#include "lockdep_states.h"
+#undef LOCKDEP_STATE
+};
+
+static inline const char *state_name(enum lock_usage_bit bit)
+{
+        return (bit & 1) ? state_rnames[bit >> 2] : state_names[bit >> 2];
+}
+
+static int exclusive_bit(int new_bit)
+{
+        /*
+         * USED_IN
+         * USED_IN_READ
+         * ENABLED
+         * ENABLED_READ
+         *
+         * bit 0 - write/read
+         * bit 1 - used_in/enabled
+         * bit 2+  state
+         */
+
+        int state = new_bit & ~3;
+        int dir = new_bit & 2;
+
+        /*
+         * keep state, bit flip the direction and strip read.
+         */
+        return state | (dir ^ 2);
+}
+
+static int check_irq_usage(struct task_struct *curr, struct held_lock *prev,
+                           struct held_lock *next, enum lock_usage_bit bit)
 {
         /*
          * Prove that the new dependency does not connect a hardirq-safe
@@ -1273,38 +1316,34 @@ check_prev_add_irq(struct task_struct *curr, struct held_lock *prev,
          * the backwards-subgraph starting at <prev>, and the
          * forwards-subgraph starting at <next>:
          */
-        if (!check_usage(curr, prev, next, LOCK_USED_IN_HARDIRQ,
-                                        LOCK_ENABLED_HARDIRQS, "hard"))
+        if (!check_usage(curr, prev, next, bit,
+                           exclusive_bit(bit), state_name(bit)))
                 return 0;
 
+        bit++; /* _READ */
+
         /*
          * Prove that the new dependency does not connect a hardirq-safe-read
          * lock with a hardirq-unsafe lock - to achieve this we search
          * the backwards-subgraph starting at <prev>, and the
          * forwards-subgraph starting at <next>:
          */
-        if (!check_usage(curr, prev, next, LOCK_USED_IN_HARDIRQ_READ,
-                                        LOCK_ENABLED_HARDIRQS, "hard-read"))
+        if (!check_usage(curr, prev, next, bit,
+                           exclusive_bit(bit), state_name(bit)))
                 return 0;
 
-        /*
-         * Prove that the new dependency does not connect a softirq-safe
-         * lock with a softirq-unsafe lock - to achieve this we search
-         * the backwards-subgraph starting at <prev>, and the
-         * forwards-subgraph starting at <next>:
-         */
-        if (!check_usage(curr, prev, next, LOCK_USED_IN_SOFTIRQ,
-                                        LOCK_ENABLED_SOFTIRQS, "soft"))
-                return 0;
-        /*
-         * Prove that the new dependency does not connect a softirq-safe-read
-         * lock with a softirq-unsafe lock - to achieve this we search
-         * the backwards-subgraph starting at <prev>, and the
-         * forwards-subgraph starting at <next>:
-         */
-        if (!check_usage(curr, prev, next, LOCK_USED_IN_SOFTIRQ_READ,
-                                        LOCK_ENABLED_SOFTIRQS, "soft"))
+        return 1;
+}
+
+static int
+check_prev_add_irq(struct task_struct *curr, struct held_lock *prev,
+                struct held_lock *next)
+{
+#define LOCKDEP_STATE(__STATE)                                          \
+        if (!check_irq_usage(curr, prev, next, LOCK_USED_IN_##__STATE)) \
                 return 0;
+#include "lockdep_states.h"
+#undef LOCKDEP_STATE
 
         return 1;
 }
@@ -1933,7 +1972,7 @@ void print_irqtrace_events(struct task_struct *curr)
         print_ip_sym(curr->softirq_disable_ip);
 }
 
-static int hardirq_verbose(struct lock_class *class)
+static int HARDIRQ_verbose(struct lock_class *class)
 {
 #if HARDIRQ_VERBOSE
         return class_filter(class);
@@ -1941,7 +1980,7 @@ static int hardirq_verbose(struct lock_class *class)
         return 0;
 }
 
-static int softirq_verbose(struct lock_class *class)
+static int SOFTIRQ_verbose(struct lock_class *class)
 {
 #if SOFTIRQ_VERBOSE
         return class_filter(class);
@@ -1949,185 +1988,94 @@ static int softirq_verbose(struct lock_class *class)
         return 0;
 }
 
+static int RECLAIM_FS_verbose(struct lock_class *class)
+{
+#if RECLAIM_VERBOSE
+        return class_filter(class);
+#endif
+        return 0;
+}
+
 #define STRICT_READ_CHECKS      1
 
-static int mark_lock_irq(struct task_struct *curr, struct held_lock *this,
-                enum lock_usage_bit new_bit)
+static int (*state_verbose_f[])(struct lock_class *class) = {
+#define LOCKDEP_STATE(__STATE) \
+        __STATE##_verbose,
+#include "lockdep_states.h"
+#undef LOCKDEP_STATE
+};
+
+static inline int state_verbose(enum lock_usage_bit bit,
+                                struct lock_class *class)
 {
-        int ret = 1;
+        return state_verbose_f[bit >> 2](class);
+}
 
-        switch(new_bit) {
-        case LOCK_USED_IN_HARDIRQ:
-                if (!valid_state(curr, this, new_bit, LOCK_ENABLED_HARDIRQS))
-                        return 0;
-                if (!valid_state(curr, this, new_bit,
-                                 LOCK_ENABLED_HARDIRQS_READ))
-                        return 0;
-                /*
-                 * just marked it hardirq-safe, check that this lock
-                 * took no hardirq-unsafe lock in the past:
-                 */
-                if (!check_usage_forwards(curr, this,
-                                          LOCK_ENABLED_HARDIRQS, "hard"))
-                        return 0;
-#if STRICT_READ_CHECKS
-                /*
-                 * just marked it hardirq-safe, check that this lock
-                 * took no hardirq-unsafe-read lock in the past:
-                 */
-                if (!check_usage_forwards(curr, this,
-                                LOCK_ENABLED_HARDIRQS_READ, "hard-read"))
-                        return 0;
-#endif
-                if (hardirq_verbose(hlock_class(this)))
-                        ret = 2;
-                break;
-        case LOCK_USED_IN_SOFTIRQ:
-                if (!valid_state(curr, this, new_bit, LOCK_ENABLED_SOFTIRQS))
-                        return 0;
-                if (!valid_state(curr, this, new_bit,
-                                 LOCK_ENABLED_SOFTIRQS_READ))
-                        return 0;
-                /*
-                 * just marked it softirq-safe, check that this lock
-                 * took no softirq-unsafe lock in the past:
-                 */
-                if (!check_usage_forwards(curr, this,
-                                          LOCK_ENABLED_SOFTIRQS, "soft"))
-                        return 0;
-#if STRICT_READ_CHECKS
-                /*
-                 * just marked it softirq-safe, check that this lock
-                 * took no softirq-unsafe-read lock in the past:
-                 */
-                if (!check_usage_forwards(curr, this,
-                                LOCK_ENABLED_SOFTIRQS_READ, "soft-read"))
-                        return 0;
-#endif
-                if (softirq_verbose(hlock_class(this)))
-                        ret = 2;
-                break;
-        case LOCK_USED_IN_HARDIRQ_READ:
-                if (!valid_state(curr, this, new_bit, LOCK_ENABLED_HARDIRQS))
-                        return 0;
-                /*
-                 * just marked it hardirq-read-safe, check that this lock
-                 * took no hardirq-unsafe lock in the past:
-                 */
-                if (!check_usage_forwards(curr, this,
-                                          LOCK_ENABLED_HARDIRQS, "hard"))
-                        return 0;
-                if (hardirq_verbose(hlock_class(this)))
-                        ret = 2;
-                break;
-        case LOCK_USED_IN_SOFTIRQ_READ:
-                if (!valid_state(curr, this, new_bit, LOCK_ENABLED_SOFTIRQS))
-                        return 0;
-                /*
-                 * just marked it softirq-read-safe, check that this lock
-                 * took no softirq-unsafe lock in the past:
-                 */
-                if (!check_usage_forwards(curr, this,
-                                          LOCK_ENABLED_SOFTIRQS, "soft"))
-                        return 0;
-                if (softirq_verbose(hlock_class(this)))
-                        ret = 2;
-                break;
-        case LOCK_ENABLED_HARDIRQS:
-                if (!valid_state(curr, this, new_bit, LOCK_USED_IN_HARDIRQ))
-                        return 0;
-                if (!valid_state(curr, this, new_bit,
-                                 LOCK_USED_IN_HARDIRQ_READ))
-                        return 0;
-                /*
-                 * just marked it hardirq-unsafe, check that no hardirq-safe
-                 * lock in the system ever took it in the past:
-                 */
-                if (!check_usage_backwards(curr, this,
-                                           LOCK_USED_IN_HARDIRQ, "hard"))
-                        return 0;
-#if STRICT_READ_CHECKS
-                /*
-                 * just marked it hardirq-unsafe, check that no
-                 * hardirq-safe-read lock in the system ever took
-                 * it in the past:
-                 */
-                if (!check_usage_backwards(curr, this,
-                                   LOCK_USED_IN_HARDIRQ_READ, "hard-read"))
-                        return 0;
-#endif
-                if (hardirq_verbose(hlock_class(this)))
-                        ret = 2;
-                break;
-        case LOCK_ENABLED_SOFTIRQS:
-                if (!valid_state(curr, this, new_bit, LOCK_USED_IN_SOFTIRQ))
-                        return 0;
-                if (!valid_state(curr, this, new_bit,
-                                 LOCK_USED_IN_SOFTIRQ_READ))
-                        return 0;
-                /*
-                 * just marked it softirq-unsafe, check that no softirq-safe
-                 * lock in the system ever took it in the past:
-                 */
-                if (!check_usage_backwards(curr, this,
-                                           LOCK_USED_IN_SOFTIRQ, "soft"))
-                        return 0;
-#if STRICT_READ_CHECKS
-                /*
-                 * just marked it softirq-unsafe, check that no
-                 * softirq-safe-read lock in the system ever took
-                 * it in the past:
-                 */
-                if (!check_usage_backwards(curr, this,
-                                   LOCK_USED_IN_SOFTIRQ_READ, "soft-read"))
-                        return 0;
-#endif
-                if (softirq_verbose(hlock_class(this)))
-                        ret = 2;
-                break;
-        case LOCK_ENABLED_HARDIRQS_READ:
-                if (!valid_state(curr, this, new_bit, LOCK_USED_IN_HARDIRQ))
-                        return 0;
-#if STRICT_READ_CHECKS
-                /*
-                 * just marked it hardirq-read-unsafe, check that no
-                 * hardirq-safe lock in the system ever took it in the past:
-                 */
-                if (!check_usage_backwards(curr, this,
-                                           LOCK_USED_IN_HARDIRQ, "hard"))
-                        return 0;
-#endif
-                if (hardirq_verbose(hlock_class(this)))
-                        ret = 2;
-                break;
-        case LOCK_ENABLED_SOFTIRQS_READ:
-                if (!valid_state(curr, this, new_bit, LOCK_USED_IN_SOFTIRQ))
+typedef int (*check_usage_f)(struct task_struct *, struct held_lock *,
+                             enum lock_usage_bit bit, const char *name);
+
+static int
+mark_lock_irq(struct task_struct *curr, struct held_lock *this, int new_bit)
+{
+        int excl_bit = exclusive_bit(new_bit);
+        int read = new_bit & 1;
+        int dir = new_bit & 2;
+
+        /*
+         * mark USED_IN has to look forwards -- to ensure no dependency
+         * has ENABLED state, which would allow recursion deadlocks.
+         *
+         * mark ENABLED has to look backwards -- to ensure no dependee
+         * has USED_IN state, which, again, would allow  recursion deadlocks.
+         */
+        check_usage_f usage = dir ?
+                check_usage_backwards : check_usage_forwards;
+
+        /*
+         * Validate that this particular lock does not have conflicting
+         * usage states.
+         */
+        if (!valid_state(curr, this, new_bit, excl_bit))
+                return 0;
+
+        /*
+         * Validate that the lock dependencies don't have conflicting usage
+         * states.
+         */
+        if ((!read || !dir || STRICT_READ_CHECKS) &&
+                        !usage(curr, this, excl_bit, state_name(new_bit)))
+                return 0;
+
+        /*
+         * Check for read in write conflicts
+         */
+        if (!read) {
+                if (!valid_state(curr, this, new_bit, excl_bit + 1))
                         return 0;
-#if STRICT_READ_CHECKS
-                /*
-                 * just marked it softirq-read-unsafe, check that no
-                 * softirq-safe lock in the system ever took it in the past:
-                 */
-                if (!check_usage_backwards(curr, this,
-                                           LOCK_USED_IN_SOFTIRQ, "soft"))
+
+                if (STRICT_READ_CHECKS &&
+                        !usage(curr, this, excl_bit + 1,
+                                state_name(new_bit + 1)))
                         return 0;
-#endif
-                if (softirq_verbose(hlock_class(this)))
-                        ret = 2;
-                break;
-        default:
-                WARN_ON(1);
-                break;
         }
 
-        return ret;
+        if (state_verbose(new_bit, hlock_class(this)))
+                return 2;
+
+        return 1;
 }
 
+enum mark_type {
+#define LOCKDEP_STATE(__STATE)  __STATE,
+#include "lockdep_states.h"
+#undef LOCKDEP_STATE
+};
+
 /*
  * Mark all held locks with a usage bit:
  */
 static int
-mark_held_locks(struct task_struct *curr, int hardirq)
+mark_held_locks(struct task_struct *curr, enum mark_type mark)
 {
         enum lock_usage_bit usage_bit;
         struct held_lock *hlock;
@@ -2136,17 +2084,12 @@ mark_held_locks(struct task_struct *curr, int hardirq)
         for (i = 0; i < curr->lockdep_depth; i++) {
                 hlock = curr->held_locks + i;
 
-                if (hardirq) {
-                        if (hlock->read)
-                                usage_bit = LOCK_ENABLED_HARDIRQS_READ;
-                        else
-                                usage_bit = LOCK_ENABLED_HARDIRQS;
-                } else {
-                        if (hlock->read)
-                                usage_bit = LOCK_ENABLED_SOFTIRQS_READ;
-                        else
-                                usage_bit = LOCK_ENABLED_SOFTIRQS;
-                }
+                usage_bit = 2 + (mark << 2); /* ENABLED */
+                if (hlock->read)
+                        usage_bit += 1; /* READ */
+
+                BUG_ON(usage_bit >= LOCK_USAGE_STATES);
+
                 if (!mark_lock(curr, hlock, usage_bit))
                         return 0;
         }
@@ -2200,7 +2143,7 @@ void trace_hardirqs_on_caller(unsigned long ip)
          * We are going to turn hardirqs on, so set the
          * usage bit for all held locks:
          */
-        if (!mark_held_locks(curr, 1))
+        if (!mark_held_locks(curr, HARDIRQ))
                 return;
         /*
          * If we have softirqs enabled, then set the usage
@@ -2208,7 +2151,7 @@ void trace_hardirqs_on_caller(unsigned long ip)
          * this bit from being set before)
          */
         if (curr->softirqs_enabled)
-                if (!mark_held_locks(curr, 0))
+                if (!mark_held_locks(curr, SOFTIRQ))
                         return;
 
         curr->hardirq_enable_ip = ip;
@@ -2288,7 +2231,7 @@ void trace_softirqs_on(unsigned long ip)
          * enabled too:
          */
         if (curr->hardirqs_enabled)
-                mark_held_locks(curr, 0);
+                mark_held_locks(curr, SOFTIRQ);
 }
 
 /*
@@ -2317,6 +2260,48 @@ void trace_softirqs_off(unsigned long ip)
                 debug_atomic_inc(&redundant_softirqs_off);
 }
 
+static void __lockdep_trace_alloc(gfp_t gfp_mask, unsigned long flags)
+{
+        struct task_struct *curr = current;
+
+        if (unlikely(!debug_locks))
+                return;
+
+        /* no reclaim without waiting on it */
+        if (!(gfp_mask & __GFP_WAIT))
+                return;
+
+        /* this guy won't enter reclaim */
+        if ((curr->flags & PF_MEMALLOC) && !(gfp_mask & __GFP_NOMEMALLOC))
+                return;
+
+        /* We're only interested __GFP_FS allocations for now */
+        if (!(gfp_mask & __GFP_FS))
+                return;
+
+        if (DEBUG_LOCKS_WARN_ON(irqs_disabled_flags(flags)))
+                return;
+
+        mark_held_locks(curr, RECLAIM_FS);
+}
+
+static void check_flags(unsigned long flags);
+
+void lockdep_trace_alloc(gfp_t gfp_mask)
+{
+        unsigned long flags;
+
+        if (unlikely(current->lockdep_recursion))
+                return;
+
+        raw_local_irq_save(flags);
+        check_flags(flags);
+        current->lockdep_recursion = 1;
+        __lockdep_trace_alloc(gfp_mask, flags);
+        current->lockdep_recursion = 0;
+        raw_local_irq_restore(flags);
+}
+
 static int mark_irqflags(struct task_struct *curr, struct held_lock *hlock)
 {
         /*
@@ -2345,19 +2330,35 @@ static int mark_irqflags(struct task_struct *curr, struct held_lock *hlock)
         if (!hlock->hardirqs_off) {
                 if (hlock->read) {
                         if (!mark_lock(curr, hlock,
-                                        LOCK_ENABLED_HARDIRQS_READ))
+                                        LOCK_ENABLED_HARDIRQ_READ))
                                 return 0;
                         if (curr->softirqs_enabled)
                                 if (!mark_lock(curr, hlock,
-                                                LOCK_ENABLED_SOFTIRQS_READ))
+                                                LOCK_ENABLED_SOFTIRQ_READ))
                                         return 0;
                 } else {
                         if (!mark_lock(curr, hlock,
-                                        LOCK_ENABLED_HARDIRQS))
+                                        LOCK_ENABLED_HARDIRQ))
                                 return 0;
                         if (curr->softirqs_enabled)
                                 if (!mark_lock(curr, hlock,
-                                                LOCK_ENABLED_SOFTIRQS))
+                                                LOCK_ENABLED_SOFTIRQ))
+                                        return 0;
+                }
+        }
+
+        /*
+         * We reuse the irq context infrastructure more broadly as a general
+         * context checking code. This tests GFP_FS recursion (a lock taken
+         * during reclaim for a GFP_FS allocation is held over a GFP_FS
+         * allocation).
+         */
+        if (!hlock->trylock && (curr->lockdep_reclaim_gfp & __GFP_FS)) {
+                if (hlock->read) {
+                        if (!mark_lock(curr, hlock, LOCK_USED_IN_RECLAIM_FS_READ))
+                                        return 0;
+                } else {
+                        if (!mark_lock(curr, hlock, LOCK_USED_IN_RECLAIM_FS))
                                         return 0;
                 }
         }
@@ -2412,6 +2413,10 @@ static inline int separate_irq_context(struct task_struct *curr,
         return 0;
 }
 
+void lockdep_trace_alloc(gfp_t gfp_mask)
+{
+}
+
 #endif
 
 /*
@@ -2445,14 +2450,13 @@ static int mark_lock(struct task_struct *curr, struct held_lock *this,
                 return 0;
 
         switch (new_bit) {
-        case LOCK_USED_IN_HARDIRQ:
-        case LOCK_USED_IN_SOFTIRQ:
-        case LOCK_USED_IN_HARDIRQ_READ:
-        case LOCK_USED_IN_SOFTIRQ_READ:
-        case LOCK_ENABLED_HARDIRQS:
-        case LOCK_ENABLED_SOFTIRQS:
-        case LOCK_ENABLED_HARDIRQS_READ:
-        case LOCK_ENABLED_SOFTIRQS_READ:
+#define LOCKDEP_STATE(__STATE)                  \
+        case LOCK_USED_IN_##__STATE:            \
+        case LOCK_USED_IN_##__STATE##_READ:     \
+        case LOCK_ENABLED_##__STATE:            \
+        case LOCK_ENABLED_##__STATE##_READ:
+#include "lockdep_states.h"
+#undef LOCKDEP_STATE
                 ret = mark_lock_irq(curr, this, new_bit);
                 if (!ret)
                         return 0;
@@ -2966,6 +2970,16 @@ void lock_release(struct lockdep_map *lock, int nested,
 }
 EXPORT_SYMBOL_GPL(lock_release);
 
+void lockdep_set_current_reclaim_state(gfp_t gfp_mask)
+{
+        current->lockdep_reclaim_gfp = gfp_mask;
+}
+
+void lockdep_clear_current_reclaim_state(void)
+{
+        current->lockdep_reclaim_gfp = 0;
+}
+
 #ifdef CONFIG_LOCK_STAT
 static int
 print_lock_contention_bug(struct task_struct *curr, struct lockdep_map *lock,
diff --git a/kernel/lockdep_internals.h b/kernel/lockdep_internals.h
index 56b196932c08..a2cc7e9a6e84 100644
--- a/kernel/lockdep_internals.h
+++ b/kernel/lockdep_internals.h
@@ -7,6 +7,45 @@
  */
 
 /*
+ * Lock-class usage-state bits:
+ */
+enum lock_usage_bit {
+#define LOCKDEP_STATE(__STATE)          \
+        LOCK_USED_IN_##__STATE,         \
+        LOCK_USED_IN_##__STATE##_READ,  \
+        LOCK_ENABLED_##__STATE,         \
+        LOCK_ENABLED_##__STATE##_READ,
+#include "lockdep_states.h"
+#undef LOCKDEP_STATE
+        LOCK_USED,
+        LOCK_USAGE_STATES
+};
+
+/*
+ * Usage-state bitmasks:
+ */
+#define __LOCKF(__STATE)        LOCKF_##__STATE = (1 << LOCK_##__STATE),
+
+enum {
+#define LOCKDEP_STATE(__STATE)                                          \
+        __LOCKF(USED_IN_##__STATE)                                      \
+        __LOCKF(USED_IN_##__STATE##_READ)                               \
+        __LOCKF(ENABLED_##__STATE)                                      \
+        __LOCKF(ENABLED_##__STATE##_READ)
+#include "lockdep_states.h"
+#undef LOCKDEP_STATE
+        __LOCKF(USED)
+};
+
+#define LOCKF_ENABLED_IRQ (LOCKF_ENABLED_HARDIRQ | LOCKF_ENABLED_SOFTIRQ)
+#define LOCKF_USED_IN_IRQ (LOCKF_USED_IN_HARDIRQ | LOCKF_USED_IN_SOFTIRQ)
+
+#define LOCKF_ENABLED_IRQ_READ \
+                (LOCKF_ENABLED_HARDIRQ_READ | LOCKF_ENABLED_SOFTIRQ_READ)
+#define LOCKF_USED_IN_IRQ_READ \
+                (LOCKF_USED_IN_HARDIRQ_READ | LOCKF_USED_IN_SOFTIRQ_READ)
+
+/*
  * MAX_LOCKDEP_ENTRIES is the maximum number of lock dependencies
  * we track.
  *
@@ -31,8 +70,10 @@
 extern struct list_head all_lock_classes;
 extern struct lock_chain lock_chains[];
 
-extern void
-get_usage_chars(struct lock_class *class, char *c1, char *c2, char *c3, char *c4);
+#define LOCK_USAGE_CHARS (1+LOCK_USAGE_STATES/2)
+
+extern void get_usage_chars(struct lock_class *class,
+                            char usage[LOCK_USAGE_CHARS]);
 
 extern const char * __get_key_name(struct lockdep_subclass_key *key, char *str);
 
diff --git a/kernel/lockdep_proc.c b/kernel/lockdep_proc.c
index 13716b813896..d7135aa2d2c4 100644
--- a/kernel/lockdep_proc.c
+++ b/kernel/lockdep_proc.c
@@ -84,7 +84,7 @@ static int l_show(struct seq_file *m, void *v)
 {
         struct lock_class *class = v;
         struct lock_list *entry;
-        char c1, c2, c3, c4;
+        char usage[LOCK_USAGE_CHARS];
 
         if (v == SEQ_START_TOKEN) {
                 seq_printf(m, "all lock classes:\n");
@@ -100,8 +100,8 @@ static int l_show(struct seq_file *m, void *v)
         seq_printf(m, " BD:%5ld", lockdep_count_backward_deps(class));
 #endif
 
-        get_usage_chars(class, &c1, &c2, &c3, &c4);
-        seq_printf(m, " %c%c%c%c", c1, c2, c3, c4);
+        get_usage_chars(class, usage);
+        seq_printf(m, " %s", usage);
 
         seq_printf(m, ": ");
         print_name(m, class);
@@ -300,27 +300,27 @@ static int lockdep_stats_show(struct seq_file *m, void *v)
                         nr_uncategorized++;
                 if (class->usage_mask & LOCKF_USED_IN_IRQ)
                         nr_irq_safe++;
-                if (class->usage_mask & LOCKF_ENABLED_IRQS)
+                if (class->usage_mask & LOCKF_ENABLED_IRQ)
                         nr_irq_unsafe++;
                 if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ)
                         nr_softirq_safe++;
-                if (class->usage_mask & LOCKF_ENABLED_SOFTIRQS)
+                if (class->usage_mask & LOCKF_ENABLED_SOFTIRQ)
                         nr_softirq_unsafe++;
                 if (class->usage_mask & LOCKF_USED_IN_HARDIRQ)
                         nr_hardirq_safe++;
-                if (class->usage_mask & LOCKF_ENABLED_HARDIRQS)
+                if (class->usage_mask & LOCKF_ENABLED_HARDIRQ)
                         nr_hardirq_unsafe++;
                 if (class->usage_mask & LOCKF_USED_IN_IRQ_READ)
                         nr_irq_read_safe++;
-                if (class->usage_mask & LOCKF_ENABLED_IRQS_READ)
+                if (class->usage_mask & LOCKF_ENABLED_IRQ_READ)
                         nr_irq_read_unsafe++;
                 if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ_READ)
                         nr_softirq_read_safe++;
-                if (class->usage_mask & LOCKF_ENABLED_SOFTIRQS_READ)
+                if (class->usage_mask & LOCKF_ENABLED_SOFTIRQ_READ)
                         nr_softirq_read_unsafe++;
                 if (class->usage_mask & LOCKF_USED_IN_HARDIRQ_READ)
                         nr_hardirq_read_safe++;
-                if (class->usage_mask & LOCKF_ENABLED_HARDIRQS_READ)
+                if (class->usage_mask & LOCKF_ENABLED_HARDIRQ_READ)
                         nr_hardirq_read_unsafe++;
 
 #ifdef CONFIG_PROVE_LOCKING
@@ -601,6 +601,10 @@ static void seq_stats(struct seq_file *m, struct lock_stat_data *data)
 static void seq_header(struct seq_file *m)
 {
         seq_printf(m, "lock_stat version 0.3\n");
+
+        if (unlikely(!debug_locks))
+                seq_printf(m, "*WARNING* lock debugging disabled!! - possibly due to a lockdep warning\n");
+
         seq_line(m, '-', 0, 40 + 1 + 10 * (14 + 1));
         seq_printf(m, "%40s %14s %14s %14s %14s %14s %14s %14s %14s "
                         "%14s %14s\n",
diff --git a/kernel/lockdep_states.h b/kernel/lockdep_states.h
new file mode 100644
index 000000000000..995b0cc2b84c
--- /dev/null
+++ b/kernel/lockdep_states.h
@@ -0,0 +1,9 @@
+/*
+ * Lockdep states,
+ *
+ * please update XXX_LOCK_USAGE_STATES in include/linux/lockdep.h whenever
+ * you add one, or come up with a nice dynamic solution.
+ */
+LOCKDEP_STATE(HARDIRQ)
+LOCKDEP_STATE(SOFTIRQ)
+LOCKDEP_STATE(RECLAIM_FS)
diff --git a/kernel/mutex-debug.c b/kernel/mutex-debug.c
index 1d94160eb532..50d022e5a560 100644
--- a/kernel/mutex-debug.c
+++ b/kernel/mutex-debug.c
@@ -26,11 +26,6 @@
 /*
  * Must be called with lock->wait_lock held.
  */
-void debug_mutex_set_owner(struct mutex *lock, struct thread_info *new_owner)
-{
-        lock->owner = new_owner;
-}
-
 void debug_mutex_lock_common(struct mutex *lock, struct mutex_waiter *waiter)
 {
         memset(waiter, MUTEX_DEBUG_INIT, sizeof(*waiter));
@@ -59,7 +54,6 @@ void debug_mutex_add_waiter(struct mutex *lock, struct mutex_waiter *waiter,
 
         /* Mark the current thread as blocked on the lock: */
         ti->task->blocked_on = waiter;
-        waiter->lock = lock;
 }
 
 void mutex_remove_waiter(struct mutex *lock, struct mutex_waiter *waiter,
@@ -82,7 +76,7 @@ void debug_mutex_unlock(struct mutex *lock)
         DEBUG_LOCKS_WARN_ON(lock->magic != lock);
         DEBUG_LOCKS_WARN_ON(lock->owner != current_thread_info());
         DEBUG_LOCKS_WARN_ON(!lock->wait_list.prev && !lock->wait_list.next);
-        DEBUG_LOCKS_WARN_ON(lock->owner != current_thread_info());
+        mutex_clear_owner(lock);
 }
 
 void debug_mutex_init(struct mutex *lock, const char *name,
@@ -95,7 +89,6 @@ void debug_mutex_init(struct mutex *lock, const char *name,
         debug_check_no_locks_freed((void *)lock, sizeof(*lock));
         lockdep_init_map(&lock->dep_map, name, key, 0);
 #endif
-        lock->owner = NULL;
         lock->magic = lock;
 }
 
diff --git a/kernel/mutex-debug.h b/kernel/mutex-debug.h
index babfbdfc534b..6b2d735846a5 100644
--- a/kernel/mutex-debug.h
+++ b/kernel/mutex-debug.h
@@ -13,14 +13,6 @@
 /*
  * This must be called with lock->wait_lock held.
  */
-extern void
-debug_mutex_set_owner(struct mutex *lock, struct thread_info *new_owner);
-
-static inline void debug_mutex_clear_owner(struct mutex *lock)
-{
-        lock->owner = NULL;
-}
-
 extern void debug_mutex_lock_common(struct mutex *lock,
                                     struct mutex_waiter *waiter);
 extern void debug_mutex_wake_waiter(struct mutex *lock,
@@ -35,6 +27,16 @@ extern void debug_mutex_unlock(struct mutex *lock);
 extern void debug_mutex_init(struct mutex *lock, const char *name,
                              struct lock_class_key *key);
 
+static inline void mutex_set_owner(struct mutex *lock)
+{
+        lock->owner = current_thread_info();
+}
+
+static inline void mutex_clear_owner(struct mutex *lock)
+{
+        lock->owner = NULL;
+}
+
 #define spin_lock_mutex(lock, flags)                    \
         do {                                            \
                 struct mutex *l = container_of(lock, struct mutex, wait_lock); \
diff --git a/kernel/mutex.c b/kernel/mutex.c
index 4f45d4b658ef..5d79781394a3 100644
--- a/kernel/mutex.c
+++ b/kernel/mutex.c
@@ -10,6 +10,11 @@
  * Many thanks to Arjan van de Ven, Thomas Gleixner, Steven Rostedt and
  * David Howells for suggestions and improvements.
  *
+ *  - Adaptive spinning for mutexes by Peter Zijlstra. (Ported to mainline
+ *    from the -rt tree, where it was originally implemented for rtmutexes
+ *    by Steven Rostedt, based on work by Gregory Haskins, Peter Morreale
+ *    and Sven Dietrich.
+ *
  * Also see Documentation/mutex-design.txt.
  */
 #include <linux/mutex.h>
@@ -46,6 +51,7 @@ __mutex_init(struct mutex *lock, const char *name, struct lock_class_key *key)
         atomic_set(&lock->count, 1);
         spin_lock_init(&lock->wait_lock);
         INIT_LIST_HEAD(&lock->wait_list);
+        mutex_clear_owner(lock);
 
         debug_mutex_init(lock, name, key);
 }
@@ -91,6 +97,7 @@ void inline __sched mutex_lock(struct mutex *lock)
          * 'unlocked' into 'locked' state.
          */
         __mutex_fastpath_lock(&lock->count, __mutex_lock_slowpath);
+        mutex_set_owner(lock);
 }
 
 EXPORT_SYMBOL(mutex_lock);
@@ -115,6 +122,14 @@ void __sched mutex_unlock(struct mutex *lock)
          * The unlocking fastpath is the 0->1 transition from 'locked'
          * into 'unlocked' state:
          */
+#ifndef CONFIG_DEBUG_MUTEXES
+        /*
+         * When debugging is enabled we must not clear the owner before time,
+         * the slow path will always be taken, and that clears the owner field
+         * after verifying that it was indeed current.
+         */
+        mutex_clear_owner(lock);
+#endif
         __mutex_fastpath_unlock(&lock->count, __mutex_unlock_slowpath);
 }
 
@@ -129,21 +144,75 @@ __mutex_lock_common(struct mutex *lock, long state, unsigned int subclass,
 {
         struct task_struct *task = current;
         struct mutex_waiter waiter;
-        unsigned int old_val;
         unsigned long flags;
 
+        preempt_disable();
+        mutex_acquire(&lock->dep_map, subclass, 0, ip);
+#if defined(CONFIG_SMP) && !defined(CONFIG_DEBUG_MUTEXES)
+        /*
+         * Optimistic spinning.
+         *
+         * We try to spin for acquisition when we find that there are no
+         * pending waiters and the lock owner is currently running on a
+         * (different) CPU.
+         *
+         * The rationale is that if the lock owner is running, it is likely to
+         * release the lock soon.
+         *
+         * Since this needs the lock owner, and this mutex implementation
+         * doesn't track the owner atomically in the lock field, we need to
+         * track it non-atomically.
+         *
+         * We can't do this for DEBUG_MUTEXES because that relies on wait_lock
+         * to serialize everything.
+         */
+
+        for (;;) {
+                struct thread_info *owner;
+
+                /*
+                 * If there's an owner, wait for it to either
+                 * release the lock or go to sleep.
+                 */
+                owner = ACCESS_ONCE(lock->owner);
+                if (owner && !mutex_spin_on_owner(lock, owner))
+                        break;
+
+                if (atomic_cmpxchg(&lock->count, 1, 0) == 1) {
+                        lock_acquired(&lock->dep_map, ip);
+                        mutex_set_owner(lock);
+                        preempt_enable();
+                        return 0;
+                }
+
+                /*
+                 * When there's no owner, we might have preempted between the
+                 * owner acquiring the lock and setting the owner field. If
+                 * we're an RT task that will live-lock because we won't let
+                 * the owner complete.
+                 */
+                if (!owner && (need_resched() || rt_task(task)))
+                        break;
+
+                /*
+                 * The cpu_relax() call is a compiler barrier which forces
+                 * everything in this loop to be re-loaded. We don't need
+                 * memory barriers as we'll eventually observe the right
+                 * values at the cost of a few extra spins.
+                 */
+                cpu_relax();
+        }
+#endif
         spin_lock_mutex(&lock->wait_lock, flags);
 
         debug_mutex_lock_common(lock, &waiter);
-        mutex_acquire(&lock->dep_map, subclass, 0, ip);
         debug_mutex_add_waiter(lock, &waiter, task_thread_info(task));
 
         /* add waiting tasks to the end of the waitqueue (FIFO): */
         list_add_tail(&waiter.list, &lock->wait_list);
         waiter.task = task;
 
-        old_val = atomic_xchg(&lock->count, -1);
-        if (old_val == 1)
+        if (atomic_xchg(&lock->count, -1) == 1)
                 goto done;
 
         lock_contended(&lock->dep_map, ip);
@@ -158,8 +227,7 @@ __mutex_lock_common(struct mutex *lock, long state, unsigned int subclass,
                  * that when we release the lock, we properly wake up the
                  * other waiters:
                  */
-                old_val = atomic_xchg(&lock->count, -1);
-                if (old_val == 1)
+                if (atomic_xchg(&lock->count, -1) == 1)
                         break;
 
                 /*
@@ -173,21 +241,22 @@ __mutex_lock_common(struct mutex *lock, long state, unsigned int subclass,
                         spin_unlock_mutex(&lock->wait_lock, flags);
 
                         debug_mutex_free_waiter(&waiter);
+                        preempt_enable();
                         return -EINTR;
                 }
                 __set_task_state(task, state);
 
                 /* didnt get the lock, go to sleep: */
                 spin_unlock_mutex(&lock->wait_lock, flags);
-                schedule();
+                __schedule();
                 spin_lock_mutex(&lock->wait_lock, flags);
         }
 
 done:
         lock_acquired(&lock->dep_map, ip);
         /* got the lock - rejoice! */
-        mutex_remove_waiter(lock, &waiter, task_thread_info(task));
-        debug_mutex_set_owner(lock, task_thread_info(task));
+        mutex_remove_waiter(lock, &waiter, current_thread_info());
+        mutex_set_owner(lock);
 
         /* set it to 0 if there are no waiters left: */
         if (likely(list_empty(&lock->wait_list)))
@@ -196,6 +265,7 @@ done:
         spin_unlock_mutex(&lock->wait_lock, flags);
 
         debug_mutex_free_waiter(&waiter);
+        preempt_enable();
 
         return 0;
 }
@@ -222,7 +292,8 @@ int __sched
 mutex_lock_interruptible_nested(struct mutex *lock, unsigned int subclass)
 {
         might_sleep();
-        return __mutex_lock_common(lock, TASK_INTERRUPTIBLE, subclass, _RET_IP_);
+        return __mutex_lock_common(lock, TASK_INTERRUPTIBLE,
+                                   subclass, _RET_IP_);
 }
 
 EXPORT_SYMBOL_GPL(mutex_lock_interruptible_nested);
@@ -260,8 +331,6 @@ __mutex_unlock_common_slowpath(atomic_t *lock_count, int nested)
                 wake_up_process(waiter->task);
         }
 
-        debug_mutex_clear_owner(lock);
-
         spin_unlock_mutex(&lock->wait_lock, flags);
 }
 
@@ -298,18 +367,30 @@ __mutex_lock_interruptible_slowpath(atomic_t *lock_count);
  */
 int __sched mutex_lock_interruptible(struct mutex *lock)
 {
+        int ret;
+
         might_sleep();
-        return __mutex_fastpath_lock_retval
+        ret =  __mutex_fastpath_lock_retval
                         (&lock->count, __mutex_lock_interruptible_slowpath);
+        if (!ret)
+                mutex_set_owner(lock);
+
+        return ret;
 }
 
 EXPORT_SYMBOL(mutex_lock_interruptible);
 
 int __sched mutex_lock_killable(struct mutex *lock)
 {
+        int ret;
+
         might_sleep();
-        return __mutex_fastpath_lock_retval
+        ret = __mutex_fastpath_lock_retval
                         (&lock->count, __mutex_lock_killable_slowpath);
+        if (!ret)
+                mutex_set_owner(lock);
+
+        return ret;
 }
 EXPORT_SYMBOL(mutex_lock_killable);
 
@@ -352,9 +433,10 @@ static inline int __mutex_trylock_slowpath(atomic_t *lock_count)
 
         prev = atomic_xchg(&lock->count, -1);
         if (likely(prev == 1)) {
-                debug_mutex_set_owner(lock, current_thread_info());
+                mutex_set_owner(lock);
                 mutex_acquire(&lock->dep_map, 0, 1, _RET_IP_);
         }
+
         /* Set it back to 0 if there are no waiters: */
         if (likely(list_empty(&lock->wait_list)))
                 atomic_set(&lock->count, 0);
@@ -380,8 +462,13 @@ static inline int __mutex_trylock_slowpath(atomic_t *lock_count)
  */
 int __sched mutex_trylock(struct mutex *lock)
 {
-        return __mutex_fastpath_trylock(&lock->count,
-                                        __mutex_trylock_slowpath);
+        int ret;
+
+        ret = __mutex_fastpath_trylock(&lock->count, __mutex_trylock_slowpath);
+        if (ret)
+                mutex_set_owner(lock);
+
+        return ret;
 }
 
 EXPORT_SYMBOL(mutex_trylock);
diff --git a/kernel/mutex.h b/kernel/mutex.h
index a075dafbb290..67578ca48f94 100644
--- a/kernel/mutex.h
+++ b/kernel/mutex.h
@@ -16,8 +16,26 @@
 #define mutex_remove_waiter(lock, waiter, ti) \
                 __list_del((waiter)->list.prev, (waiter)->list.next)
 
-#define debug_mutex_set_owner(lock, new_owner)          do { } while (0)
-#define debug_mutex_clear_owner(lock)                   do { } while (0)
+#ifdef CONFIG_SMP
+static inline void mutex_set_owner(struct mutex *lock)
+{
+        lock->owner = current_thread_info();
+}
+
+static inline void mutex_clear_owner(struct mutex *lock)
+{
+        lock->owner = NULL;
+}
+#else
+static inline void mutex_set_owner(struct mutex *lock)
+{
+}
+
+static inline void mutex_clear_owner(struct mutex *lock)
+{
+}
+#endif
+
 #define debug_mutex_wake_waiter(lock, waiter)           do { } while (0)
 #define debug_mutex_free_waiter(waiter)                 do { } while (0)
 #define debug_mutex_add_waiter(lock, waiter, ti)        do { } while (0)
diff --git a/kernel/ns_cgroup.c b/kernel/ns_cgroup.c
index 78bc3fdac0d2..5aa854f9e5ae 100644
--- a/kernel/ns_cgroup.c
+++ b/kernel/ns_cgroup.c
@@ -34,7 +34,7 @@ int ns_cgroup_clone(struct task_struct *task, struct pid *pid)
 
 /*
  * Rules:
- *   1. you can only enter a cgroup which is a child of your current
+ *   1. you can only enter a cgroup which is a descendant of your current
  *     cgroup
  *   2. you can only place another process into a cgroup if
  *     a. you have CAP_SYS_ADMIN
@@ -45,21 +45,15 @@ int ns_cgroup_clone(struct task_struct *task, struct pid *pid)
 static int ns_can_attach(struct cgroup_subsys *ss,
                 struct cgroup *new_cgroup, struct task_struct *task)
 {
-        struct cgroup *orig;
-
         if (current != task) {
                 if (!capable(CAP_SYS_ADMIN))
                         return -EPERM;
 
-                if (!cgroup_is_descendant(new_cgroup))
+                if (!cgroup_is_descendant(new_cgroup, current))
                         return -EPERM;
         }
 
-        if (atomic_read(&new_cgroup->count) != 0)
-                return -EPERM;
-
-        orig = task_cgroup(task, ns_subsys_id);
-        if (orig && orig != new_cgroup->parent)
+        if (!cgroup_is_descendant(new_cgroup, task))
                 return -EPERM;
 
         return 0;
@@ -77,7 +71,7 @@ static struct cgroup_subsys_state *ns_create(struct cgroup_subsys *ss,
 
         if (!capable(CAP_SYS_ADMIN))
                 return ERR_PTR(-EPERM);
-        if (!cgroup_is_descendant(cgroup))
+        if (!cgroup_is_descendant(cgroup, current))
                 return ERR_PTR(-EPERM);
 
         ns_cgroup = kzalloc(sizeof(*ns_cgroup), GFP_KERNEL);
diff --git a/kernel/pid.c b/kernel/pid.c
index 1b3586fe753a..b2e5f78fd281 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -403,6 +403,8 @@ struct pid *get_task_pid(struct task_struct *task, enum pid_type type)
 {
         struct pid *pid;
         rcu_read_lock();
+        if (type != PIDTYPE_PID)
+                task = task->group_leader;
         pid = get_pid(task->pids[type].pid);
         rcu_read_unlock();
         return pid;
@@ -450,11 +452,24 @@ pid_t pid_vnr(struct pid *pid)
 }
 EXPORT_SYMBOL_GPL(pid_vnr);
 
-pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns)
+pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type,
+                        struct pid_namespace *ns)
 {
-        return pid_nr_ns(task_pid(tsk), ns);
+        pid_t nr = 0;
+
+        rcu_read_lock();
+        if (!ns)
+                ns = current->nsproxy->pid_ns;
+        if (likely(pid_alive(task))) {
+                if (type != PIDTYPE_PID)
+                        task = task->group_leader;
+                nr = pid_nr_ns(task->pids[type].pid, ns);
+        }
+        rcu_read_unlock();
+
+        return nr;
 }
-EXPORT_SYMBOL(task_pid_nr_ns);
+EXPORT_SYMBOL(__task_pid_nr_ns);
 
 pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns)
 {
@@ -462,18 +477,6 @@ pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns)
 }
 EXPORT_SYMBOL(task_tgid_nr_ns);
 
-pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns)
-{
-        return pid_nr_ns(task_pgrp(tsk), ns);
-}
-EXPORT_SYMBOL(task_pgrp_nr_ns);
-
-pid_t task_session_nr_ns(struct task_struct *tsk, struct pid_namespace *ns)
-{
-        return pid_nr_ns(task_session(tsk), ns);
-}
-EXPORT_SYMBOL(task_session_nr_ns);
-
 struct pid_namespace *task_active_pid_ns(struct task_struct *tsk)
 {
         return ns_of_pid(task_pid(tsk));
diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c
index fab8ea86fac3..2d1001b4858d 100644
--- a/kernel/pid_namespace.c
+++ b/kernel/pid_namespace.c
@@ -152,6 +152,7 @@ void zap_pid_ns_processes(struct pid_namespace *pid_ns)
 {
         int nr;
         int rc;
+        struct task_struct *task;
 
         /*
          * The last thread in the cgroup-init thread group is terminating.
@@ -169,7 +170,19 @@ void zap_pid_ns_processes(struct pid_namespace *pid_ns)
         read_lock(&tasklist_lock);
         nr = next_pidmap(pid_ns, 1);
         while (nr > 0) {
-                kill_proc_info(SIGKILL, SEND_SIG_PRIV, nr);
+                rcu_read_lock();
+
+                /*
+                 * Use force_sig() since it clears SIGNAL_UNKILLABLE ensuring
+                 * any nested-container's init processes don't ignore the
+                 * signal
+                 */
+                task = pid_task(find_vpid(nr), PIDTYPE_PID);
+                if (task)
+                        force_sig(SIGKILL, task);
+
+                rcu_read_unlock();
+
                 nr = next_pidmap(pid_ns, nr);
         }
         read_unlock(&tasklist_lock);
diff --git a/kernel/power/disk.c b/kernel/power/disk.c
index 9d1c1a0de350..5f21ab2bbcdf 100644
--- a/kernel/power/disk.c
+++ b/kernel/power/disk.c
@@ -22,6 +22,7 @@
 #include <linux/console.h>
 #include <linux/cpu.h>
 #include <linux/freezer.h>
+#include <asm/suspend.h>
 
 #include "power.h"
 
@@ -214,7 +215,7 @@ static int create_image(int platform_mode)
                 return error;
 
         device_pm_lock();
-        local_irq_disable();
+
         /* At this point, device_suspend() has been called, but *not*
          * device_power_down(). We *must* call device_power_down() now.
          * Otherwise, drivers for some devices (e.g. interrupt controllers)
@@ -225,13 +226,25 @@ static int create_image(int platform_mode)
         if (error) {
                 printk(KERN_ERR "PM: Some devices failed to power down, "
                         "aborting hibernation\n");
-                goto Enable_irqs;
+                goto Unlock;
         }
+
+        error = platform_pre_snapshot(platform_mode);
+        if (error || hibernation_test(TEST_PLATFORM))
+                goto Platform_finish;
+
+        error = disable_nonboot_cpus();
+        if (error || hibernation_test(TEST_CPUS)
+            || hibernation_testmode(HIBERNATION_TEST))
+                goto Enable_cpus;
+
+        local_irq_disable();
+
         sysdev_suspend(PMSG_FREEZE);
         if (error) {
                 printk(KERN_ERR "PM: Some devices failed to power down, "
                         "aborting hibernation\n");
-                goto Power_up_devices;
+                goto Enable_irqs;
         }
 
         if (hibernation_test(TEST_CORE))
@@ -247,17 +260,28 @@ static int create_image(int platform_mode)
         restore_processor_state();
         if (!in_suspend)
                 platform_leave(platform_mode);
+
  Power_up:
         sysdev_resume();
         /* NOTE:  device_power_up() is just a resume() for devices
          * that suspended with irqs off ... no overall powerup.
          */
- Power_up_devices:
-        device_power_up(in_suspend ?
-                (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
+
  Enable_irqs:
         local_irq_enable();
+
+ Enable_cpus:
+        enable_nonboot_cpus();
+
+ Platform_finish:
+        platform_finish(platform_mode);
+
+        device_power_up(in_suspend ?
+                (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
+
+ Unlock:
         device_pm_unlock();
+
         return error;
 }
 
@@ -291,25 +315,9 @@ int hibernation_snapshot(int platform_mode)
         if (hibernation_test(TEST_DEVICES))
                 goto Recover_platform;
 
-        error = platform_pre_snapshot(platform_mode);
-        if (error || hibernation_test(TEST_PLATFORM))
-                goto Finish;
-
-        error = disable_nonboot_cpus();
-        if (!error) {
-                if (hibernation_test(TEST_CPUS))
-                        goto Enable_cpus;
-
-                if (hibernation_testmode(HIBERNATION_TEST))
-                        goto Enable_cpus;
+        error = create_image(platform_mode);
+        /* Control returns here after successful restore */
 
-                error = create_image(platform_mode);
-                /* Control returns here after successful restore */
-        }
- Enable_cpus:
-        enable_nonboot_cpus();
- Finish:
-        platform_finish(platform_mode);
  Resume_devices:
         device_resume(in_suspend ?
                 (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
@@ -331,19 +339,33 @@ int hibernation_snapshot(int platform_mode)
  *      kernel.
  */
 
-static int resume_target_kernel(void)
+static int resume_target_kernel(bool platform_mode)
 {
         int error;
 
         device_pm_lock();
-        local_irq_disable();
+
         error = device_power_down(PMSG_QUIESCE);
         if (error) {
                 printk(KERN_ERR "PM: Some devices failed to power down, "
                         "aborting resume\n");
-                goto Enable_irqs;
+                goto Unlock;
         }
-        sysdev_suspend(PMSG_QUIESCE);
+
+        error = platform_pre_restore(platform_mode);
+        if (error)
+                goto Cleanup;
+
+        error = disable_nonboot_cpus();
+        if (error)
+                goto Enable_cpus;
+
+        local_irq_disable();
+
+        error = sysdev_suspend(PMSG_QUIESCE);
+        if (error)
+                goto Enable_irqs;
+
         /* We'll ignore saved state, but this gets preempt count (etc) right */
         save_processor_state();
         error = restore_highmem();
@@ -366,11 +388,23 @@ static int resume_target_kernel(void)
         swsusp_free();
         restore_processor_state();
         touch_softlockup_watchdog();
+
         sysdev_resume();
-        device_power_up(PMSG_RECOVER);
+
  Enable_irqs:
         local_irq_enable();
+
+ Enable_cpus:
+        enable_nonboot_cpus();
+
+ Cleanup:
+        platform_restore_cleanup(platform_mode);
+
+        device_power_up(PMSG_RECOVER);
+
+ Unlock:
         device_pm_unlock();
+
         return error;
 }
 
@@ -390,19 +424,10 @@ int hibernation_restore(int platform_mode)
         pm_prepare_console();
         suspend_console();
         error = device_suspend(PMSG_QUIESCE);
-        if (error)
-                goto Finish;
-
-        error = platform_pre_restore(platform_mode);
         if (!error) {
-                error = disable_nonboot_cpus();
-                if (!error)
-                        error = resume_target_kernel();
-                enable_nonboot_cpus();
+                error = resume_target_kernel(platform_mode);
+                device_resume(PMSG_RECOVER);
         }
-        platform_restore_cleanup(platform_mode);
-        device_resume(PMSG_RECOVER);
- Finish:
         resume_console();
         pm_restore_console();
         return error;
@@ -438,38 +463,46 @@ int hibernation_platform_enter(void)
                 goto Resume_devices;
         }
 
+        device_pm_lock();
+
+        error = device_power_down(PMSG_HIBERNATE);
+        if (error)
+                goto Unlock;
+
         error = hibernation_ops->prepare();
         if (error)
-                goto Resume_devices;
+                goto Platofrm_finish;
 
         error = disable_nonboot_cpus();
         if (error)
-                goto Finish;
+                goto Platofrm_finish;
 
-        device_pm_lock();
         local_irq_disable();
-        error = device_power_down(PMSG_HIBERNATE);
-        if (!error) {
-                sysdev_suspend(PMSG_HIBERNATE);
-                hibernation_ops->enter();
-                /* We should never get here */
-                while (1);
-        }
-        local_irq_enable();
-        device_pm_unlock();
+        sysdev_suspend(PMSG_HIBERNATE);
+        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.
          */
- Finish:
+ Platofrm_finish:
         hibernation_ops->finish();
+
+        device_power_up(PMSG_RESTORE);
+
+ Unlock:
+        device_pm_unlock();
+
  Resume_devices:
         entering_platform_hibernation = false;
         device_resume(PMSG_RESTORE);
         resume_console();
+
  Close:
         hibernation_ops->end();
+
         return error;
 }
 
diff --git a/kernel/power/main.c b/kernel/power/main.c
index c9632f841f64..f172f41858bb 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -287,17 +287,32 @@ void __attribute__ ((weak)) arch_suspend_enable_irqs(void)
  */
 static int suspend_enter(suspend_state_t state)
 {
-        int error = 0;
+        int error;
 
         device_pm_lock();
-        arch_suspend_disable_irqs();
-        BUG_ON(!irqs_disabled());
 
-        if ((error = device_power_down(PMSG_SUSPEND))) {
+        error = device_power_down(PMSG_SUSPEND);
+        if (error) {
                 printk(KERN_ERR "PM: Some devices failed to power down\n");
                 goto Done;
         }
 
+        if (suspend_ops->prepare) {
+                error = suspend_ops->prepare();
+                if (error)
+                        goto Power_up_devices;
+        }
+
+        if (suspend_test(TEST_PLATFORM))
+                goto Platfrom_finish;
+
+        error = disable_nonboot_cpus();
+        if (error || suspend_test(TEST_CPUS))
+                goto Enable_cpus;
+
+        arch_suspend_disable_irqs();
+        BUG_ON(!irqs_disabled());
+
         error = sysdev_suspend(PMSG_SUSPEND);
         if (!error) {
                 if (!suspend_test(TEST_CORE))
@@ -305,11 +320,22 @@ static int suspend_enter(suspend_state_t state)
                 sysdev_resume();
         }
 
-        device_power_up(PMSG_RESUME);
- Done:
         arch_suspend_enable_irqs();
         BUG_ON(irqs_disabled());
+
+ Enable_cpus:
+        enable_nonboot_cpus();
+
+ Platfrom_finish:
+        if (suspend_ops->finish)
+                suspend_ops->finish();
+
+ Power_up_devices:
+        device_power_up(PMSG_RESUME);
+
+ Done:
         device_pm_unlock();
+
         return error;
 }
 
@@ -341,23 +367,8 @@ int suspend_devices_and_enter(suspend_state_t state)
         if (suspend_test(TEST_DEVICES))
                 goto Recover_platform;
 
-        if (suspend_ops->prepare) {
-                error = suspend_ops->prepare();
-                if (error)
-                        goto Resume_devices;
-        }
-
-        if (suspend_test(TEST_PLATFORM))
-                goto Finish;
-
-        error = disable_nonboot_cpus();
-        if (!error && !suspend_test(TEST_CPUS))
-                suspend_enter(state);
+        suspend_enter(state);
 
-        enable_nonboot_cpus();
- Finish:
-        if (suspend_ops->finish)
-                suspend_ops->finish();
  Resume_devices:
         suspend_test_start();
         device_resume(PMSG_RESUME);
diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index f5fc2d7680f2..33e2e4a819f9 100644
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -321,13 +321,10 @@ static int create_mem_extents(struct list_head *list, gfp_t gfp_mask)
 
         INIT_LIST_HEAD(list);
 
-        for_each_zone(zone) {
+        for_each_populated_zone(zone) {
                 unsigned long zone_start, zone_end;
                 struct mem_extent *ext, *cur, *aux;
 
-                if (!populated_zone(zone))
-                        continue;
-
                 zone_start = zone->zone_start_pfn;
                 zone_end = zone->zone_start_pfn + zone->spanned_pages;
 
@@ -804,8 +801,8 @@ static unsigned int count_free_highmem_pages(void)
         struct zone *zone;
         unsigned int cnt = 0;
 
-        for_each_zone(zone)
-                if (populated_zone(zone) && is_highmem(zone))
+        for_each_populated_zone(zone)
+                if (is_highmem(zone))
                         cnt += zone_page_state(zone, NR_FREE_PAGES);
 
         return cnt;
diff --git a/kernel/power/swsusp.c b/kernel/power/swsusp.c
index a92c91451559..78c35047586d 100644
--- a/kernel/power/swsusp.c
+++ b/kernel/power/swsusp.c
@@ -51,6 +51,7 @@
 #include <linux/highmem.h>
 #include <linux/time.h>
 #include <linux/rbtree.h>
+#include <linux/io.h>
 
 #include "power.h"
 
@@ -229,17 +230,16 @@ int swsusp_shrink_memory(void)
                 size = count_data_pages() + PAGES_FOR_IO + SPARE_PAGES;
                 tmp = size;
                 size += highmem_size;
-                for_each_zone (zone)
-                        if (populated_zone(zone)) {
-                                tmp += snapshot_additional_pages(zone);
-                                if (is_highmem(zone)) {
-                                        highmem_size -=
+                for_each_populated_zone(zone) {
+                        tmp += snapshot_additional_pages(zone);
+                        if (is_highmem(zone)) {
+                                highmem_size -=
                                         zone_page_state(zone, NR_FREE_PAGES);
-                                } else {
-                                        tmp -= zone_page_state(zone, NR_FREE_PAGES);
-                                        tmp += zone->lowmem_reserve[ZONE_NORMAL];
-                                }
+                        } else {
+                                tmp -= zone_page_state(zone, NR_FREE_PAGES);
+                                tmp += zone->lowmem_reserve[ZONE_NORMAL];
                         }
+                }
 
                 if (highmem_size < 0)
                         highmem_size = 0;
diff --git a/kernel/printk.c b/kernel/printk.c
index e3602d0755b0..a5f61a9acedb 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -32,6 +32,7 @@
 #include <linux/security.h>
 #include <linux/bootmem.h>
 #include <linux/syscalls.h>
+#include <linux/kexec.h>
 
 #include <asm/uaccess.h>
 
@@ -135,6 +136,24 @@ static char *log_buf = __log_buf;
 static int log_buf_len = __LOG_BUF_LEN;
 static unsigned logged_chars; /* Number of chars produced since last read+clear operation */
 
+#ifdef CONFIG_KEXEC
+/*
+ * This appends the listed symbols to /proc/vmcoreinfo
+ *
+ * /proc/vmcoreinfo is used by various utiilties, like crash and makedumpfile to
+ * obtain access to symbols that are otherwise very difficult to locate.  These
+ * symbols are specifically used so that utilities can access and extract the
+ * dmesg log from a vmcore file after a crash.
+ */
+void log_buf_kexec_setup(void)
+{
+        VMCOREINFO_SYMBOL(log_buf);
+        VMCOREINFO_SYMBOL(log_end);
+        VMCOREINFO_SYMBOL(log_buf_len);
+        VMCOREINFO_SYMBOL(logged_chars);
+}
+#endif
+
 static int __init log_buf_len_setup(char *str)
 {
         unsigned size = memparse(str, &str);
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index c9cf48b21f05..5105f5a6a2ce 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -60,11 +60,15 @@ static void ptrace_untrace(struct task_struct *child)
 {
         spin_lock(&child->sighand->siglock);
         if (task_is_traced(child)) {
-                if (child->signal->flags & SIGNAL_STOP_STOPPED) {
+                /*
+                 * If the group stop is completed or in progress,
+                 * this thread was already counted as stopped.
+                 */
+                if (child->signal->flags & SIGNAL_STOP_STOPPED ||
+                    child->signal->group_stop_count)
                         __set_task_state(child, TASK_STOPPED);
-                } else {
+                else
                         signal_wake_up(child, 1);
-                }
         }
         spin_unlock(&child->sighand->siglock);
 }
@@ -235,18 +239,58 @@ out:
         return retval;
 }
 
-static inline void __ptrace_detach(struct task_struct *child, unsigned int data)
+/*
+ * Called with irqs disabled, returns true if childs should reap themselves.
+ */
+static int ignoring_children(struct sighand_struct *sigh)
 {
-        child->exit_code = data;
-        /* .. re-parent .. */
-        __ptrace_unlink(child);
-        /* .. and wake it up. */
-        if (child->exit_state != EXIT_ZOMBIE)
-                wake_up_process(child);
+        int ret;
+        spin_lock(&sigh->siglock);
+        ret = (sigh->action[SIGCHLD-1].sa.sa_handler == SIG_IGN) ||
+              (sigh->action[SIGCHLD-1].sa.sa_flags & SA_NOCLDWAIT);
+        spin_unlock(&sigh->siglock);
+        return ret;
+}
+
+/*
+ * Called with tasklist_lock held for writing.
+ * Unlink a traced task, and clean it up if it was a traced zombie.
+ * Return true if it needs to be reaped with release_task().
+ * (We can't call release_task() here because we already hold tasklist_lock.)
+ *
+ * If it's a zombie, our attachedness prevented normal parent notification
+ * or self-reaping.  Do notification now if it would have happened earlier.
+ * If it should reap itself, return true.
+ *
+ * If it's our own child, there is no notification to do.
+ * But if our normal children self-reap, then this child
+ * was prevented by ptrace and we must reap it now.
+ */
+static bool __ptrace_detach(struct task_struct *tracer, struct task_struct *p)
+{
+        __ptrace_unlink(p);
+
+        if (p->exit_state == EXIT_ZOMBIE) {
+                if (!task_detached(p) && thread_group_empty(p)) {
+                        if (!same_thread_group(p->real_parent, tracer))
+                                do_notify_parent(p, p->exit_signal);
+                        else if (ignoring_children(tracer->sighand))
+                                p->exit_signal = -1;
+                }
+                if (task_detached(p)) {
+                        /* Mark it as in the process of being reaped. */
+                        p->exit_state = EXIT_DEAD;
+                        return true;
+                }
+        }
+
+        return false;
 }
 
 int ptrace_detach(struct task_struct *child, unsigned int data)
 {
+        bool dead = false;
+
         if (!valid_signal(data))
                 return -EIO;
 
@@ -255,14 +299,45 @@ int ptrace_detach(struct task_struct *child, unsigned int data)
         clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
 
         write_lock_irq(&tasklist_lock);
-        /* protect against de_thread()->release_task() */
-        if (child->ptrace)
-                __ptrace_detach(child, data);
+        /*
+         * This child can be already killed. Make sure de_thread() or
+         * our sub-thread doing do_wait() didn't do release_task() yet.
+         */
+        if (child->ptrace) {
+                child->exit_code = data;
+                dead = __ptrace_detach(current, child);
+        }
         write_unlock_irq(&tasklist_lock);
 
+        if (unlikely(dead))
+                release_task(child);
+
         return 0;
 }
 
+/*
+ * Detach all tasks we were using ptrace on.
+ */
+void exit_ptrace(struct task_struct *tracer)
+{
+        struct task_struct *p, *n;
+        LIST_HEAD(ptrace_dead);
+
+        write_lock_irq(&tasklist_lock);
+        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);
+
+        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);
+        }
+}
+
 int ptrace_readdata(struct task_struct *tsk, unsigned long src, char __user *dst, int len)
 {
         int copied = 0;
diff --git a/kernel/rcutorture.c b/kernel/rcutorture.c
index 7c4142a79f0a..9b4a975a4b4a 100644
--- a/kernel/rcutorture.c
+++ b/kernel/rcutorture.c
@@ -126,6 +126,7 @@ static atomic_t n_rcu_torture_mberror;
 static atomic_t n_rcu_torture_error;
 static long n_rcu_torture_timers = 0;
 static struct list_head rcu_torture_removed;
+static cpumask_var_t shuffle_tmp_mask;
 
 static int stutter_pause_test = 0;
 
@@ -889,10 +890,9 @@ static int rcu_idle_cpu;	/* Force all torture tasks off this CPU */
  */
 static void rcu_torture_shuffle_tasks(void)
 {
-        cpumask_t tmp_mask;
         int i;
 
-        cpus_setall(tmp_mask);
+        cpumask_setall(shuffle_tmp_mask);
         get_online_cpus();
 
         /* No point in shuffling if there is only one online CPU (ex: UP) */
@@ -902,29 +902,29 @@ static void rcu_torture_shuffle_tasks(void)
         }
 
         if (rcu_idle_cpu != -1)
-                cpu_clear(rcu_idle_cpu, tmp_mask);
+                cpumask_clear_cpu(rcu_idle_cpu, shuffle_tmp_mask);
 
-        set_cpus_allowed_ptr(current, &tmp_mask);
+        set_cpus_allowed_ptr(current, shuffle_tmp_mask);
 
         if (reader_tasks) {
                 for (i = 0; i < nrealreaders; i++)
                         if (reader_tasks[i])
                                 set_cpus_allowed_ptr(reader_tasks[i],
-                                                     &tmp_mask);
+                                                     shuffle_tmp_mask);
         }
 
         if (fakewriter_tasks) {
                 for (i = 0; i < nfakewriters; i++)
                         if (fakewriter_tasks[i])
                                 set_cpus_allowed_ptr(fakewriter_tasks[i],
-                                                     &tmp_mask);
+                                                     shuffle_tmp_mask);
         }
 
         if (writer_task)
-                set_cpus_allowed_ptr(writer_task, &tmp_mask);
+                set_cpus_allowed_ptr(writer_task, shuffle_tmp_mask);
 
         if (stats_task)
-                set_cpus_allowed_ptr(stats_task, &tmp_mask);
+                set_cpus_allowed_ptr(stats_task, shuffle_tmp_mask);
 
         if (rcu_idle_cpu == -1)
                 rcu_idle_cpu = num_online_cpus() - 1;
@@ -1012,6 +1012,7 @@ rcu_torture_cleanup(void)
         if (shuffler_task) {
                 VERBOSE_PRINTK_STRING("Stopping rcu_torture_shuffle task");
                 kthread_stop(shuffler_task);
+                free_cpumask_var(shuffle_tmp_mask);
         }
         shuffler_task = NULL;
 
@@ -1190,10 +1191,18 @@ rcu_torture_init(void)
         }
         if (test_no_idle_hz) {
                 rcu_idle_cpu = num_online_cpus() - 1;
+
+                if (!alloc_cpumask_var(&shuffle_tmp_mask, GFP_KERNEL)) {
+                        firsterr = -ENOMEM;
+                        VERBOSE_PRINTK_ERRSTRING("Failed to alloc mask");
+                        goto unwind;
+                }
+
                 /* Create the shuffler thread */
                 shuffler_task = kthread_run(rcu_torture_shuffle, NULL,
                                           "rcu_torture_shuffle");
                 if (IS_ERR(shuffler_task)) {
+                        free_cpumask_var(shuffle_tmp_mask);
                         firsterr = PTR_ERR(shuffler_task);
                         VERBOSE_PRINTK_ERRSTRING("Failed to create shuffler");
                         shuffler_task = NULL;
diff --git a/kernel/relay.c b/kernel/relay.c
index 8f2179c8056f..e92db8c06acf 100644
--- a/kernel/relay.c
+++ b/kernel/relay.c
@@ -797,13 +797,15 @@ void relay_subbufs_consumed(struct rchan *chan,
         if (!chan)
                 return;
 
-        if (cpu >= NR_CPUS || !chan->buf[cpu])
+        if (cpu >= NR_CPUS || !chan->buf[cpu] ||
+                                        subbufs_consumed > chan->n_subbufs)
                 return;
 
         buf = chan->buf[cpu];
-        buf->subbufs_consumed += subbufs_consumed;
-        if (buf->subbufs_consumed > buf->subbufs_produced)
+        if (subbufs_consumed > buf->subbufs_produced - buf->subbufs_consumed)
                 buf->subbufs_consumed = buf->subbufs_produced;
+        else
+                buf->subbufs_consumed += subbufs_consumed;
 }
 EXPORT_SYMBOL_GPL(relay_subbufs_consumed);
 
diff --git a/kernel/sched.c b/kernel/sched.c
index 5757e03cfac0..73513f4e19df 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -4942,15 +4942,13 @@ pick_next_task(struct rq *rq)
 /*
  * schedule() is the main scheduler function.
  */
-asmlinkage void __sched schedule(void)
+asmlinkage void __sched __schedule(void)
 {
         struct task_struct *prev, *next;
         unsigned long *switch_count;
         struct rq *rq;
         int cpu;
 
-need_resched:
-        preempt_disable();
         cpu = smp_processor_id();
         rq = cpu_rq(cpu);
         rcu_qsctr_inc(cpu);
@@ -5007,13 +5005,80 @@ need_resched_nonpreemptible:
 
         if (unlikely(reacquire_kernel_lock(current) < 0))
                 goto need_resched_nonpreemptible;
+}
 
+asmlinkage void __sched schedule(void)
+{
+need_resched:
+        preempt_disable();
+        __schedule();
         preempt_enable_no_resched();
         if (unlikely(test_thread_flag(TIF_NEED_RESCHED)))
                 goto need_resched;
 }
 EXPORT_SYMBOL(schedule);
 
+#ifdef CONFIG_SMP
+/*
+ * Look out! "owner" is an entirely speculative pointer
+ * access and not reliable.
+ */
+int mutex_spin_on_owner(struct mutex *lock, struct thread_info *owner)
+{
+        unsigned int cpu;
+        struct rq *rq;
+
+        if (!sched_feat(OWNER_SPIN))
+                return 0;
+
+#ifdef CONFIG_DEBUG_PAGEALLOC
+        /*
+         * Need to access the cpu field knowing that
+         * DEBUG_PAGEALLOC could have unmapped it if
+         * the mutex owner just released it and exited.
+         */
+        if (probe_kernel_address(&owner->cpu, cpu))
+                goto out;
+#else
+        cpu = owner->cpu;
+#endif
+
+        /*
+         * Even if the access succeeded (likely case),
+         * the cpu field may no longer be valid.
+         */
+        if (cpu >= nr_cpumask_bits)
+                goto out;
+
+        /*
+         * We need to validate that we can do a
+         * get_cpu() and that we have the percpu area.
+         */
+        if (!cpu_online(cpu))
+                goto out;
+
+        rq = cpu_rq(cpu);
+
+        for (;;) {
+                /*
+                 * Owner changed, break to re-assess state.
+                 */
+                if (lock->owner != owner)
+                        break;
+
+                /*
+                 * Is that owner really running on that cpu?
+                 */
+                if (task_thread_info(rq->curr) != owner || need_resched())
+                        return 0;
+
+                cpu_relax();
+        }
+out:
+        return 1;
+}
+#endif
+
 #ifdef CONFIG_PREEMPT
 /*
  * this is the entry point to schedule() from in-kernel preemption
@@ -5131,11 +5196,17 @@ void __wake_up_locked(wait_queue_head_t *q, unsigned int mode)
         __wake_up_common(q, mode, 1, 0, NULL);
 }
 
+void __wake_up_locked_key(wait_queue_head_t *q, unsigned int mode, void *key)
+{
+        __wake_up_common(q, mode, 1, 0, key);
+}
+
 /**
- * __wake_up_sync - wake up threads blocked on a waitqueue.
+ * __wake_up_sync_key - wake up threads blocked on a waitqueue.
  * @q: the waitqueue
  * @mode: which threads
  * @nr_exclusive: how many wake-one or wake-many threads to wake up
+ * @key: opaque value to be passed to wakeup targets
  *
  * The sync wakeup differs that the waker knows that it will schedule
  * away soon, so while the target thread will be woken up, it will not
@@ -5144,8 +5215,8 @@ void __wake_up_locked(wait_queue_head_t *q, unsigned int mode)
  *
  * On UP it can prevent extra preemption.
  */
-void
-__wake_up_sync(wait_queue_head_t *q, unsigned int mode, int nr_exclusive)
+void __wake_up_sync_key(wait_queue_head_t *q, unsigned int mode,
+                        int nr_exclusive, void *key)
 {
         unsigned long flags;
         int sync = 1;
@@ -5157,9 +5228,18 @@ __wake_up_sync(wait_queue_head_t *q, unsigned int mode, int nr_exclusive)
                 sync = 0;
 
         spin_lock_irqsave(&q->lock, flags);
-        __wake_up_common(q, mode, nr_exclusive, sync, NULL);
+        __wake_up_common(q, mode, nr_exclusive, sync, key);
         spin_unlock_irqrestore(&q->lock, flags);
 }
+EXPORT_SYMBOL_GPL(__wake_up_sync_key);
+
+/*
+ * __wake_up_sync - see __wake_up_sync_key()
+ */
+void __wake_up_sync(wait_queue_head_t *q, unsigned int mode, int nr_exclusive)
+{
+        __wake_up_sync_key(q, mode, nr_exclusive, NULL);
+}
 EXPORT_SYMBOL_GPL(__wake_up_sync);      /* For internal use only */
 
 /**
diff --git a/kernel/sched_cpupri.h b/kernel/sched_cpupri.h
index 642a94ef8a0a..9a7e859b8fbf 100644
--- a/kernel/sched_cpupri.h
+++ b/kernel/sched_cpupri.h
@@ -25,7 +25,7 @@ struct cpupri {
 
 #ifdef CONFIG_SMP
 int  cpupri_find(struct cpupri *cp,
-                 struct task_struct *p, cpumask_t *lowest_mask);
+                 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);
 void cpupri_cleanup(struct cpupri *cp);
diff --git a/kernel/sched_features.h b/kernel/sched_features.h
index 76f61756e677..4569bfa7df9b 100644
--- a/kernel/sched_features.h
+++ b/kernel/sched_features.h
@@ -14,3 +14,4 @@ SCHED_FEAT(LB_WAKEUP_UPDATE, 1)
 SCHED_FEAT(ASYM_EFF_LOAD, 1)
 SCHED_FEAT(WAKEUP_OVERLAP, 0)
 SCHED_FEAT(LAST_BUDDY, 1)
+SCHED_FEAT(OWNER_SPIN, 1)
diff --git a/kernel/signal.c b/kernel/signal.c
index 1c8814481a11..d8034737db4c 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -55,10 +55,22 @@ static int sig_handler_ignored(void __user *handler, int sig)
                 (handler == SIG_DFL && sig_kernel_ignore(sig));
 }
 
-static int sig_ignored(struct task_struct *t, int sig)
+static int sig_task_ignored(struct task_struct *t, int sig,
+                int from_ancestor_ns)
 {
         void __user *handler;
 
+        handler = sig_handler(t, sig);
+
+        if (unlikely(t->signal->flags & SIGNAL_UNKILLABLE) &&
+                        handler == SIG_DFL && !from_ancestor_ns)
+                return 1;
+
+        return sig_handler_ignored(handler, sig);
+}
+
+static int sig_ignored(struct task_struct *t, int sig, int from_ancestor_ns)
+{
         /*
          * Blocked signals are never ignored, since the
          * signal handler may change by the time it is
@@ -67,14 +79,13 @@ static int sig_ignored(struct task_struct *t, int sig)
         if (sigismember(&t->blocked, sig) || sigismember(&t->real_blocked, sig))
                 return 0;
 
-        handler = sig_handler(t, sig);
-        if (!sig_handler_ignored(handler, sig))
+        if (!sig_task_ignored(t, sig, from_ancestor_ns))
                 return 0;
 
         /*
          * Tracers may want to know about even ignored signals.
          */
-        return !tracehook_consider_ignored_signal(t, sig, handler);
+        return !tracehook_consider_ignored_signal(t, sig);
 }
 
 /*
@@ -318,7 +329,7 @@ int unhandled_signal(struct task_struct *tsk, int sig)
                 return 1;
         if (handler != SIG_IGN && handler != SIG_DFL)
                 return 0;
-        return !tracehook_consider_fatal_signal(tsk, sig, handler);
+        return !tracehook_consider_fatal_signal(tsk, sig);
 }
 
 
@@ -624,7 +635,7 @@ static int check_kill_permission(int sig, struct siginfo *info,
  * Returns true if the signal should be actually delivered, otherwise
  * it should be dropped.
  */
-static int prepare_signal(int sig, struct task_struct *p)
+static int prepare_signal(int sig, struct task_struct *p, int from_ancestor_ns)
 {
         struct signal_struct *signal = p->signal;
         struct task_struct *t;
@@ -708,7 +719,7 @@ static int prepare_signal(int sig, struct task_struct *p)
                 }
         }
 
-        return !sig_ignored(p, sig);
+        return !sig_ignored(p, sig, from_ancestor_ns);
 }
 
 /*
@@ -777,7 +788,7 @@ static void complete_signal(int sig, struct task_struct *p, int group)
             !(signal->flags & (SIGNAL_UNKILLABLE | SIGNAL_GROUP_EXIT)) &&
             !sigismember(&t->real_blocked, sig) &&
             (sig == SIGKILL ||
-             !tracehook_consider_fatal_signal(t, sig, SIG_DFL))) {
+             !tracehook_consider_fatal_signal(t, sig))) {
                 /*
                  * This signal will be fatal to the whole group.
                  */
@@ -813,8 +824,8 @@ static inline int legacy_queue(struct sigpending *signals, int sig)
         return (sig < SIGRTMIN) && sigismember(&signals->signal, sig);
 }
 
-static int send_signal(int sig, struct siginfo *info, struct task_struct *t,
-                        int group)
+static int __send_signal(int sig, struct siginfo *info, struct task_struct *t,
+                        int group, int from_ancestor_ns)
 {
         struct sigpending *pending;
         struct sigqueue *q;
@@ -822,7 +833,8 @@ static int send_signal(int sig, struct siginfo *info, struct task_struct *t,
         trace_sched_signal_send(sig, t);
 
         assert_spin_locked(&t->sighand->siglock);
-        if (!prepare_signal(sig, t))
+
+        if (!prepare_signal(sig, t, from_ancestor_ns))
                 return 0;
 
         pending = group ? &t->signal->shared_pending : &t->pending;
@@ -871,6 +883,8 @@ static int send_signal(int sig, struct siginfo *info, struct task_struct *t,
                         break;
                 default:
                         copy_siginfo(&q->info, info);
+                        if (from_ancestor_ns)
+                                q->info.si_pid = 0;
                         break;
                 }
         } else if (!is_si_special(info)) {
@@ -889,6 +903,20 @@ out_set:
         return 0;
 }
 
+static int send_signal(int sig, struct siginfo *info, struct task_struct *t,
+                        int group)
+{
+        int from_ancestor_ns = 0;
+
+#ifdef CONFIG_PID_NS
+        if (!is_si_special(info) && SI_FROMUSER(info) &&
+                        task_pid_nr_ns(current, task_active_pid_ns(t)) <= 0)
+                from_ancestor_ns = 1;
+#endif
+
+        return __send_signal(sig, info, t, group, from_ancestor_ns);
+}
+
 int print_fatal_signals;
 
 static void print_fatal_signal(struct pt_regs *regs, int signr)
@@ -1133,7 +1161,7 @@ int kill_pid_info_as_uid(int sig, struct siginfo *info, struct pid *pid,
         if (sig && p->sighand) {
                 unsigned long flags;
                 spin_lock_irqsave(&p->sighand->siglock, flags);
-                ret = __group_send_sig_info(sig, info, p);
+                ret = __send_signal(sig, info, p, 1, 0);
                 spin_unlock_irqrestore(&p->sighand->siglock, flags);
         }
 out_unlock:
@@ -1320,7 +1348,7 @@ int send_sigqueue(struct sigqueue *q, struct task_struct *t, int group)
                 goto ret;
 
         ret = 1; /* the signal is ignored */
-        if (!prepare_signal(sig, t))
+        if (!prepare_signal(sig, t, 0))
                 goto out;
 
         ret = 0;
@@ -1844,9 +1872,16 @@ relock:
 
                 /*
                  * Global init gets no signals it doesn't want.
+                 * Container-init gets no signals it doesn't want from same
+                 * container.
+                 *
+                 * Note that if global/container-init sees a sig_kernel_only()
+                 * signal here, the signal must have been generated internally
+                 * or must have come from an ancestor namespace. In either
+                 * case, the signal cannot be dropped.
                  */
                 if (unlikely(signal->flags & SIGNAL_UNKILLABLE) &&
-                    !signal_group_exit(signal))
+                                !sig_kernel_only(signr))
                         continue;
 
                 if (sig_kernel_stop(signr)) {
diff --git a/kernel/slow-work.c b/kernel/slow-work.c
new file mode 100644
index 000000000000..cf2bc01186ef
--- /dev/null
+++ b/kernel/slow-work.c
@@ -0,0 +1,640 @@
+/* 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>
+
+#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 */
+
+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, struct file *,
+                                        void __user *, size_t *, loff_t *);
+
+static int slow_work_max_threads_sysctl(struct ctl_table *, int , struct file *,
+                                        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 = 255;
+static const int slow_work_min_vslow = 1;
+static const int slow_work_max_vslow = 99;
+
+ctl_table slow_work_sysctls[] = {
+        {
+                .ctl_name       = CTL_UNNUMBERED,
+                .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,
+        },
+        {
+                .ctl_name       = CTL_UNNUMBERED,
+                .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,
+        },
+        {
+                .ctl_name       = CTL_UNNUMBERED,
+                .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,
+        },
+        { .ctl_name = 0 }
+};
+#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 */
+
+/*
+ * 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.
+ */
+static LIST_HEAD(slow_work_queue);
+static LIST_HEAD(vslow_work_queue);
+static DEFINE_SPINLOCK(slow_work_queue_lock);
+
+/*
+ * 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);
+
+/*
+ * 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 bool slow_work_execute(void)
+{
+        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 */
+        }
+        spin_unlock_irq(&slow_work_queue_lock);
+
+        if (!work)
+                return false;
+
+        if (!test_and_clear_bit(SLOW_WORK_PENDING, &work->flags))
+                BUG();
+
+        work->ops->execute(work);
+
+        if (very_slow)
+                atomic_dec(&vslow_work_executing_count);
+        clear_bit_unlock(SLOW_WORK_EXECUTING, &work->flags);
+
+        /* 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);
+        }
+
+        work->ops->put_ref(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
+         */
+        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);
+        return true;
+}
+
+/**
+ * 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.
+ */
+int slow_work_enqueue(struct slow_work *work)
+{
+        unsigned long flags;
+
+        BUG_ON(slow_work_user_count <= 0);
+        BUG_ON(!work);
+        BUG_ON(!work->ops);
+        BUG_ON(!work->ops->get_ref);
+
+        /* 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)) {
+                spin_lock_irqsave(&slow_work_queue_lock, flags);
+
+                /* 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 {
+                        if (work->ops->get_ref(work) < 0)
+                                goto cant_get_ref;
+                        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);
+                        wake_up(&slow_work_thread_wq);
+                }
+
+                spin_unlock_irqrestore(&slow_work_queue_lock, flags);
+        }
+        return 0;
+
+cant_get_ref:
+        spin_unlock_irqrestore(&slow_work_queue_lock, flags);
+        return -EAGAIN;
+}
+EXPORT_SYMBOL(slow_work_enqueue);
+
+/*
+ * 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) {
+                        mod_timer(&slow_work_cull_timer,
+                                  jiffies + SLOW_WORK_CULL_TIMEOUT);
+                        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;
+
+        DEFINE_WAIT(wait);
+
+        set_freezable();
+        set_user_nice(current, -5);
+
+        for (;;) {
+                vsmax = vslow_work_proportion;
+                vsmax *= atomic_read(&slow_work_thread_count);
+                vsmax /= 100;
+
+                prepare_to_wait(&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()) {
+                        cond_resched();
+                        if (list_empty(&slow_work_queue) &&
+                            list_empty(&vslow_work_queue) &&
+                            atomic_read(&slow_work_thread_count) >
+                            slow_work_min_threads)
+                                mod_timer(&slow_work_cull_timer,
+                                          jiffies + SLOW_WORK_CULL_TIMEOUT);
+                        continue;
+                }
+
+                if (slow_work_threads_should_exit)
+                        break;
+
+                if (slow_work_cull && slow_work_cull_thread())
+                        break;
+        }
+
+        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);
+}
+
+/*
+ * Get a reference on slow work thread starter
+ */
+static int slow_work_new_thread_get_ref(struct slow_work *work)
+{
+        return 0;
+}
+
+/*
+ * Drop a reference on slow work thread starter
+ */
+static void slow_work_new_thread_put_ref(struct slow_work *work)
+{
+}
+
+/*
+ * 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,
+                          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 = {
+        .get_ref        = slow_work_new_thread_get_ref,
+        .put_ref        = slow_work_new_thread_put_ref,
+        .execute        = slow_work_new_thread_execute,
+};
+
+/*
+ * 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,
+                                        struct file *filp, void __user *buffer,
+                                        size_t *lenp, loff_t *ppos)
+{
+        int ret = proc_dointvec_minmax(table, write, filp, 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)
+                                mod_timer(&slow_work_cull_timer,
+                                          jiffies + SLOW_WORK_CULL_TIMEOUT);
+                }
+                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,
+                                        struct file *filp, void __user *buffer,
+                                        size_t *lenp, loff_t *ppos)
+{
+        int ret = proc_dointvec_minmax(table, write, filp, 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)
+                                mod_timer(&slow_work_cull_timer,
+                                          jiffies + SLOW_WORK_CULL_TIMEOUT);
+                }
+                mutex_unlock(&slow_work_user_lock);
+        }
+
+        return ret;
+}
+#endif /* CONFIG_SYSCTL */
+
+/**
+ * slow_work_register_user - Register a user 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(void)
+{
+        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);
+
+/**
+ * slow_work_unregister_user - Unregister a user of the facility
+ *
+ * Unregister a user of the facility, killing all the threads if this was the
+ * last one.
+ */
+void slow_work_unregister_user(void)
+{
+        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;
+                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");
+        }
+
+        del_timer_sync(&slow_work_cull_timer);
+
+        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
+        return 0;
+}
+
+subsys_initcall(init_slow_work);
diff --git a/kernel/spinlock.c b/kernel/spinlock.c
index 29ab20749dd3..7932653c4ebd 100644
--- a/kernel/spinlock.c
+++ b/kernel/spinlock.c
@@ -121,7 +121,8 @@ unsigned long __lockfunc _read_lock_irqsave(rwlock_t *lock)
         local_irq_save(flags);
         preempt_disable();
         rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
-        LOCK_CONTENDED(lock, _raw_read_trylock, _raw_read_lock);
+        LOCK_CONTENDED_FLAGS(lock, _raw_read_trylock, _raw_read_lock,
+                             _raw_read_lock_flags, &flags);
         return flags;
 }
 EXPORT_SYMBOL(_read_lock_irqsave);
@@ -151,7 +152,8 @@ unsigned long __lockfunc _write_lock_irqsave(rwlock_t *lock)
         local_irq_save(flags);
         preempt_disable();
         rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
-        LOCK_CONTENDED(lock, _raw_write_trylock, _raw_write_lock);
+        LOCK_CONTENDED_FLAGS(lock, _raw_write_trylock, _raw_write_lock,
+                             _raw_write_lock_flags, &flags);
         return flags;
 }
 EXPORT_SYMBOL(_write_lock_irqsave);
@@ -299,16 +301,8 @@ unsigned long __lockfunc _spin_lock_irqsave_nested(spinlock_t *lock, int subclas
         local_irq_save(flags);
         preempt_disable();
         spin_acquire(&lock->dep_map, subclass, 0, _RET_IP_);
-        /*
-         * On lockdep we dont want the hand-coded irq-enable of
-         * _raw_spin_lock_flags() code, because lockdep assumes
-         * that interrupts are not re-enabled during lock-acquire:
-         */
-#ifdef CONFIG_LOCKDEP
-        LOCK_CONTENDED(lock, _raw_spin_trylock, _raw_spin_lock);
-#else
-        _raw_spin_lock_flags(lock, &flags);
-#endif
+        LOCK_CONTENDED_FLAGS(lock, _raw_spin_trylock, _raw_spin_lock,
+                                _raw_spin_lock_flags, &flags);
         return flags;
 }
 EXPORT_SYMBOL(_spin_lock_irqsave_nested);
diff --git a/kernel/stop_machine.c b/kernel/stop_machine.c
index 74541ca49536..912823e2a11b 100644
--- a/kernel/stop_machine.c
+++ b/kernel/stop_machine.c
@@ -44,7 +44,7 @@ static DEFINE_MUTEX(setup_lock);
 static int refcount;
 static struct workqueue_struct *stop_machine_wq;
 static struct stop_machine_data active, idle;
-static const cpumask_t *active_cpus;
+static const struct cpumask *active_cpus;
 static void *stop_machine_work;
 
 static void set_state(enum stopmachine_state newstate)
diff --git a/kernel/sys.c b/kernel/sys.c
index 37f458e6882a..51dbb55604e8 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -34,6 +34,7 @@
 #include <linux/seccomp.h>
 #include <linux/cpu.h>
 #include <linux/ptrace.h>
+#include <linux/fs_struct.h>
 
 #include <linux/compat.h>
 #include <linux/syscalls.h>
@@ -1013,10 +1014,8 @@ SYSCALL_DEFINE2(setpgid, pid_t, pid, pid_t, pgid)
         if (err)
                 goto out;
 
-        if (task_pgrp(p) != pgrp) {
+        if (task_pgrp(p) != pgrp)
                 change_pid(p, PIDTYPE_PGID, pgrp);
-                set_task_pgrp(p, pid_nr(pgrp));
-        }
 
         err = 0;
 out:
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index c5ef44ff850f..82350f8f04f6 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -48,6 +48,7 @@
 #include <linux/acpi.h>
 #include <linux/reboot.h>
 #include <linux/ftrace.h>
+#include <linux/slow-work.h>
 
 #include <asm/uaccess.h>
 #include <asm/processor.h>
@@ -95,12 +96,9 @@ static int sixty = 60;
 static int neg_one = -1;
 #endif
 
-#if defined(CONFIG_MMU) && defined(CONFIG_FILE_LOCKING)
-static int two = 2;
-#endif
-
 static int zero;
 static int one = 1;
+static int two = 2;
 static unsigned long one_ul = 1;
 static int one_hundred = 100;
 
@@ -900,6 +898,14 @@ static struct ctl_table kern_table[] = {
                 .proc_handler   = &scan_unevictable_handler,
         },
 #endif
+#ifdef CONFIG_SLOW_WORK
+        {
+                .ctl_name       = CTL_UNNUMBERED,
+                .procname       = "slow-work",
+                .mode           = 0555,
+                .child          = slow_work_sysctls,
+        },
+#endif
 /*
  * NOTE: do not add new entries to this table unless you have read
  * Documentation/sysctl/ctl_unnumbered.txt
@@ -1010,7 +1016,7 @@ static struct ctl_table vm_table[] = {
                 .data           = &dirty_expire_interval,
                 .maxlen         = sizeof(dirty_expire_interval),
                 .mode           = 0644,
-                .proc_handler   = &proc_dointvec_userhz_jiffies,
+                .proc_handler   = &proc_dointvec,
         },
         {
                 .ctl_name       = VM_NR_PDFLUSH_THREADS,
@@ -1373,10 +1379,7 @@ static struct ctl_table fs_table[] = {
                 .data           = &lease_break_time,
                 .maxlen         = sizeof(int),
                 .mode           = 0644,
-                .proc_handler   = &proc_dointvec_minmax,
-                .strategy       = &sysctl_intvec,
-                .extra1         = &zero,
-                .extra2         = &two,
+                .proc_handler   = &proc_dointvec,
         },
 #endif
 #ifdef CONFIG_AIO
@@ -1417,7 +1420,10 @@ static struct ctl_table fs_table[] = {
                 .data           = &suid_dumpable,
                 .maxlen         = sizeof(int),
                 .mode           = 0644,
-                .proc_handler   = &proc_dointvec,
+                .proc_handler   = &proc_dointvec_minmax,
+                .strategy       = &sysctl_intvec,
+                .extra1         = &zero,
+                .extra2         = &two,
         },
 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
         {
diff --git a/kernel/timer.c b/kernel/timer.c
index 9b77fc9a9ac8..b4555568b4e4 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -491,14 +491,18 @@ static inline void debug_timer_free(struct timer_list *timer)
         debug_object_free(timer, &timer_debug_descr);
 }
 
-static void __init_timer(struct timer_list *timer);
+static void __init_timer(struct timer_list *timer,
+                         const char *name,
+                         struct lock_class_key *key);
 
-void init_timer_on_stack(struct timer_list *timer)
+void init_timer_on_stack_key(struct timer_list *timer,
+                             const char *name,
+                             struct lock_class_key *key)
 {
         debug_object_init_on_stack(timer, &timer_debug_descr);
-        __init_timer(timer);
+        __init_timer(timer, name, key);
 }
-EXPORT_SYMBOL_GPL(init_timer_on_stack);
+EXPORT_SYMBOL_GPL(init_timer_on_stack_key);
 
 void destroy_timer_on_stack(struct timer_list *timer)
 {
@@ -512,7 +516,9 @@ static inline void debug_timer_activate(struct timer_list *timer) { }
 static inline void debug_timer_deactivate(struct timer_list *timer) { }
 #endif
 
-static void __init_timer(struct timer_list *timer)
+static void __init_timer(struct timer_list *timer,
+                         const char *name,
+                         struct lock_class_key *key)
 {
         timer->entry.next = NULL;
         timer->base = __raw_get_cpu_var(tvec_bases);
@@ -521,6 +527,7 @@ static void __init_timer(struct timer_list *timer)
         timer->start_pid = -1;
         memset(timer->start_comm, 0, TASK_COMM_LEN);
 #endif
+        lockdep_init_map(&timer->lockdep_map, name, key, 0);
 }
 
 /**
@@ -530,19 +537,23 @@ static void __init_timer(struct timer_list *timer)
  * init_timer() must be done to a timer prior calling *any* of the
  * other timer functions.
  */
-void init_timer(struct timer_list *timer)
+void init_timer_key(struct timer_list *timer,
+                    const char *name,
+                    struct lock_class_key *key)
 {
         debug_timer_init(timer);
-        __init_timer(timer);
+        __init_timer(timer, name, key);
 }
-EXPORT_SYMBOL(init_timer);
+EXPORT_SYMBOL(init_timer_key);
 
-void init_timer_deferrable(struct timer_list *timer)
+void init_timer_deferrable_key(struct timer_list *timer,
+                               const char *name,
+                               struct lock_class_key *key)
 {
-        init_timer(timer);
+        init_timer_key(timer, name, key);
         timer_set_deferrable(timer);
 }
-EXPORT_SYMBOL(init_timer_deferrable);
+EXPORT_SYMBOL(init_timer_deferrable_key);
 
 static inline void detach_timer(struct timer_list *timer,
                                 int clear_pending)
@@ -826,6 +837,15 @@ EXPORT_SYMBOL(try_to_del_timer_sync);
  */
 int del_timer_sync(struct timer_list *timer)
 {
+#ifdef CONFIG_LOCKDEP
+        unsigned long flags;
+
+        local_irq_save(flags);
+        lock_map_acquire(&timer->lockdep_map);
+        lock_map_release(&timer->lockdep_map);
+        local_irq_restore(flags);
+#endif
+
         for (;;) {
                 int ret = try_to_del_timer_sync(timer);
                 if (ret >= 0)
@@ -897,10 +917,36 @@ static inline void __run_timers(struct tvec_base *base)
 
                         set_running_timer(base, timer);
                         detach_timer(timer, 1);
+
                         spin_unlock_irq(&base->lock);
                         {
                                 int preempt_count = preempt_count();
+
+#ifdef CONFIG_LOCKDEP
+                                /*
+                                 * It is permissible to free the timer 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 timer->lockdep_map, make a
+                                 * copy and use that here.
+                                 */
+                                struct lockdep_map lockdep_map =
+                                        timer->lockdep_map;
+#endif
+                                /*
+                                 * Couple the lock chain with the lock chain at
+                                 * del_timer_sync() by acquiring the lock_map
+                                 * around the fn() call here and in
+                                 * del_timer_sync().
+                                 */
+                                lock_map_acquire(&lockdep_map);
+
                                 fn(data);
+
+                                lock_map_release(&lockdep_map);
+
                                 if (preempt_count != preempt_count()) {
                                         printk(KERN_ERR "huh, entered %p "
                                                "with preempt_count %08x, exited"
diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
index 930c08e5b38e..dce71a5b51bc 100644
--- a/kernel/trace/trace_functions_graph.c
+++ b/kernel/trace/trace_functions_graph.c
@@ -42,6 +42,81 @@ static struct tracer_flags tracer_flags = {
 /* pid on the last trace processed */
 static pid_t last_pid[NR_CPUS] = { [0 ... NR_CPUS-1] = -1 };
 
+/* Add a function return address to the trace stack on thread info.*/
+int
+ftrace_push_return_trace(unsigned long ret, unsigned long long time,
+                         unsigned long func, int *depth)
+{
+        int index;
+
+        if (!current->ret_stack)
+                return -EBUSY;
+
+        /* The return trace stack is full */
+        if (current->curr_ret_stack == FTRACE_RETFUNC_DEPTH - 1) {
+                atomic_inc(&current->trace_overrun);
+                return -EBUSY;
+        }
+
+        index = ++current->curr_ret_stack;
+        barrier();
+        current->ret_stack[index].ret = ret;
+        current->ret_stack[index].func = func;
+        current->ret_stack[index].calltime = time;
+        *depth = index;
+
+        return 0;
+}
+
+/* Retrieve a function return address to the trace stack on thread info.*/
+void
+ftrace_pop_return_trace(struct ftrace_graph_ret *trace, unsigned long *ret)
+{
+        int index;
+
+        index = current->curr_ret_stack;
+
+        if (unlikely(index < 0)) {
+                ftrace_graph_stop();
+                WARN_ON(1);
+                /* Might as well panic, otherwise we have no where to go */
+                *ret = (unsigned long)panic;
+                return;
+        }
+
+        *ret = current->ret_stack[index].ret;
+        trace->func = current->ret_stack[index].func;
+        trace->calltime = current->ret_stack[index].calltime;
+        trace->overrun = atomic_read(&current->trace_overrun);
+        trace->depth = index;
+        barrier();
+        current->curr_ret_stack--;
+
+}
+
+/*
+ * Send the trace to the ring-buffer.
+ * @return the original return address.
+ */
+unsigned long ftrace_return_to_handler(void)
+{
+        struct ftrace_graph_ret trace;
+        unsigned long ret;
+
+        ftrace_pop_return_trace(&trace, &ret);
+        trace.rettime = cpu_clock(raw_smp_processor_id());
+        ftrace_graph_return(&trace);
+
+        if (unlikely(!ret)) {
+                ftrace_graph_stop();
+                WARN_ON(1);
+                /* Might as well panic. What else to do? */
+                ret = (unsigned long)panic;
+        }
+
+        return ret;
+}
+
 static int graph_trace_init(struct trace_array *tr)
 {
         int cpu, ret;
diff --git a/kernel/utsname_sysctl.c b/kernel/utsname_sysctl.c
index 3b34b3545936..92359cc747a7 100644
--- a/kernel/utsname_sysctl.c
+++ b/kernel/utsname_sysctl.c
@@ -37,7 +37,7 @@ static void put_uts(ctl_table *table, int write, void *which)
                 up_write(&uts_sem);
 }
 
-#ifdef CONFIG_PROC_FS
+#ifdef CONFIG_PROC_SYSCTL
 /*
  *      Special case of dostring for the UTS structure. This has locks
  *      to observe. Should this be in kernel/sys.c ????
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 1f0c509b40d3..32f8e0d2bf5a 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -48,8 +48,6 @@ struct cpu_workqueue_struct {
 
         struct workqueue_struct *wq;
         struct task_struct *thread;
-
-        int run_depth;          /* Detect run_workqueue() recursion depth */
 } ____cacheline_aligned;
 
 /*
@@ -262,13 +260,6 @@ EXPORT_SYMBOL_GPL(queue_delayed_work_on);
 static void run_workqueue(struct cpu_workqueue_struct *cwq)
 {
         spin_lock_irq(&cwq->lock);
-        cwq->run_depth++;
-        if (cwq->run_depth > 3) {
-                /* morton gets to eat his hat */
-                printk("%s: recursion depth exceeded: %d\n",
-                        __func__, cwq->run_depth);
-                dump_stack();
-        }
         while (!list_empty(&cwq->worklist)) {
                 struct work_struct *work = list_entry(cwq->worklist.next,
                                                 struct work_struct, entry);
@@ -311,7 +302,6 @@ static void run_workqueue(struct cpu_workqueue_struct *cwq)
                 spin_lock_irq(&cwq->lock);
                 cwq->current_work = NULL;
         }
-        cwq->run_depth--;
         spin_unlock_irq(&cwq->lock);
 }
 
@@ -368,29 +358,20 @@ static void insert_wq_barrier(struct cpu_workqueue_struct *cwq,
 
 static int flush_cpu_workqueue(struct cpu_workqueue_struct *cwq)
 {
-        int active;
+        int active = 0;
+        struct wq_barrier barr;
 
-        if (cwq->thread == current) {
-                /*
-                 * Probably keventd trying to flush its own queue. So simply run
-                 * it by hand rather than deadlocking.
-                 */
-                run_workqueue(cwq);
-                active = 1;
-        } else {
-                struct wq_barrier barr;
+        WARN_ON(cwq->thread == current);
 
-                active = 0;
-                spin_lock_irq(&cwq->lock);
-                if (!list_empty(&cwq->worklist) || cwq->current_work != NULL) {
-                        insert_wq_barrier(cwq, &barr, &cwq->worklist);
-                        active = 1;
-                }
-                spin_unlock_irq(&cwq->lock);
-
-                if (active)
-                        wait_for_completion(&barr.done);
+        spin_lock_irq(&cwq->lock);
+        if (!list_empty(&cwq->worklist) || cwq->current_work != NULL) {
+                insert_wq_barrier(cwq, &barr, &cwq->worklist);
+                active = 1;
         }
+        spin_unlock_irq(&cwq->lock);
+
+        if (active)
+                wait_for_completion(&barr.done);
 
         return active;
 }
@@ -416,7 +397,7 @@ void flush_workqueue(struct workqueue_struct *wq)
         might_sleep();
         lock_map_acquire(&wq->lockdep_map);
         lock_map_release(&wq->lockdep_map);
-        for_each_cpu_mask_nr(cpu, *cpu_map)
+        for_each_cpu(cpu, cpu_map)
                 flush_cpu_workqueue(per_cpu_ptr(wq->cpu_wq, cpu));
 }
 EXPORT_SYMBOL_GPL(flush_workqueue);
@@ -547,7 +528,7 @@ static void wait_on_work(struct work_struct *work)
         wq = cwq->wq;
         cpu_map = wq_cpu_map(wq);
 
-        for_each_cpu_mask_nr(cpu, *cpu_map)
+        for_each_cpu(cpu, cpu_map)
                 wait_on_cpu_work(per_cpu_ptr(wq->cpu_wq, cpu), work);
 }
 
@@ -911,7 +892,7 @@ void destroy_workqueue(struct workqueue_struct *wq)
         list_del(&wq->list);
         spin_unlock(&workqueue_lock);
 
-        for_each_cpu_mask_nr(cpu, *cpu_map)
+        for_each_cpu(cpu, cpu_map)
                 cleanup_workqueue_thread(per_cpu_ptr(wq->cpu_wq, cpu));
         cpu_maps_update_done();