Merge branch 'master' of /repos/git/net-next-2.6

41 files changed, 813 insertions, 445 deletions

diff --git a/kernel/Makefile b/kernel/Makefile
index 0b5ff083fa2..353d3fe8ba3 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -43,7 +43,7 @@ obj-$(CONFIG_RT_MUTEXES) += rtmutex.o
 obj-$(CONFIG_DEBUG_RT_MUTEXES) += rtmutex-debug.o
 obj-$(CONFIG_RT_MUTEX_TESTER) += rtmutex-tester.o
 obj-$(CONFIG_GENERIC_ISA_DMA) += dma.o
-obj-$(CONFIG_USE_GENERIC_SMP_HELPERS) += smp.o
+obj-$(CONFIG_SMP) += smp.o
 ifneq ($(CONFIG_SMP),y)
 obj-y += up.o
 endif
@@ -100,6 +100,7 @@ obj-$(CONFIG_FUNCTION_TRACER) += trace/
 obj-$(CONFIG_TRACING) += trace/
 obj-$(CONFIG_X86_DS) += trace/
 obj-$(CONFIG_RING_BUFFER) += trace/
+obj-$(CONFIG_TRACEPOINTS) += trace/
 obj-$(CONFIG_SMP) += sched_cpupri.o
 obj-$(CONFIG_IRQ_WORK) += irq_work.o
 obj-$(CONFIG_PERF_EVENTS) += perf_event.o
@@ -121,7 +122,7 @@ $(obj)/configs.o: $(obj)/config_data.h
 # config_data.h contains the same information as ikconfig.h but gzipped.
 # Info from config_data can be extracted from /proc/config*
 targets += config_data.gz
-$(obj)/config_data.gz: .config FORCE
+$(obj)/config_data.gz: $(KCONFIG_CONFIG) FORCE
         $(call if_changed,gzip)
 
 quiet_cmd_ikconfiggz = IKCFG   $@
diff --git a/kernel/audit.c b/kernel/audit.c
index 5842f65bedc..162e88e33bc 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -402,7 +402,7 @@ static void kauditd_send_skb(struct sk_buff *skb)
         if (err < 0) {
                 BUG_ON(err != -ECONNREFUSED); /* Shouldn't happen */
                 printk(KERN_ERR "audit: *NO* daemon at audit_pid=%d\n", audit_pid);
-                audit_log_lost("auditd dissapeared\n");
+                audit_log_lost("auditd disappeared\n");
                 audit_pid = 0;
                 /* we might get lucky and get this in the next auditd */
                 audit_hold_skb(skb);
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 51cddc11cd8..b24d7027b83 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -763,9 +763,8 @@ EXPORT_SYMBOL_GPL(cgroup_unlock);
  * -> cgroup_mkdir.
  */
 
-static struct dentry *cgroup_lookup(struct inode *dir,
-                        struct dentry *dentry, struct nameidata *nd);
 static int cgroup_mkdir(struct inode *dir, struct dentry *dentry, int mode);
+static struct dentry *cgroup_lookup(struct inode *, struct dentry *, struct nameidata *);
 static int cgroup_rmdir(struct inode *unused_dir, struct dentry *dentry);
 static int cgroup_populate_dir(struct cgroup *cgrp);
 static const struct inode_operations cgroup_dir_inode_operations;
@@ -862,6 +861,11 @@ static void cgroup_diput(struct dentry *dentry, struct inode *inode)
         iput(inode);
 }
 
+static int cgroup_delete(const struct dentry *d)
+{
+        return 1;
+}
+
 static void remove_dir(struct dentry *d)
 {
         struct dentry *parent = dget(d->d_parent);
@@ -912,7 +916,7 @@ static void cgroup_d_remove_dir(struct dentry *dentry)
 
         parent = dentry->d_parent;
         spin_lock(&parent->d_lock);
-        spin_lock(&dentry->d_lock);
+        spin_lock_nested(&dentry->d_lock, DENTRY_D_LOCK_NESTED);
         list_del_init(&dentry->d_u.d_child);
         spin_unlock(&dentry->d_lock);
         spin_unlock(&parent->d_lock);
@@ -1451,6 +1455,11 @@ static int cgroup_set_super(struct super_block *sb, void *data)
 
 static int cgroup_get_rootdir(struct super_block *sb)
 {
+        static const struct dentry_operations cgroup_dops = {
+                .d_iput = cgroup_diput,
+                .d_delete = cgroup_delete,
+        };
+
         struct inode *inode =
                 cgroup_new_inode(S_IFDIR | S_IRUGO | S_IXUGO | S_IWUSR, sb);
         struct dentry *dentry;
@@ -1468,6 +1477,8 @@ static int cgroup_get_rootdir(struct super_block *sb)
                 return -ENOMEM;
         }
         sb->s_root = dentry;
+        /* for everything else we want ->d_op set */
+        sb->s_d_op = &cgroup_dops;
         return 0;
 }
 
@@ -2197,6 +2208,14 @@ static const struct inode_operations cgroup_dir_inode_operations = {
         .rename = cgroup_rename,
 };
 
+static struct dentry *cgroup_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
+{
+        if (dentry->d_name.len > NAME_MAX)
+                return ERR_PTR(-ENAMETOOLONG);
+        d_add(dentry, NULL);
+        return NULL;
+}
+
 /*
  * Check if a file is a control file
  */
@@ -2207,26 +2226,6 @@ static inline struct cftype *__file_cft(struct file *file)
         return __d_cft(file->f_dentry);
 }
 
-static int cgroup_delete_dentry(const struct dentry *dentry)
-{
-        return 1;
-}
-
-static struct dentry *cgroup_lookup(struct inode *dir,
-                        struct dentry *dentry, struct nameidata *nd)
-{
-        static const struct dentry_operations cgroup_dentry_operations = {
-                .d_delete = cgroup_delete_dentry,
-                .d_iput = cgroup_diput,
-        };
-
-        if (dentry->d_name.len > NAME_MAX)
-                return ERR_PTR(-ENAMETOOLONG);
-        d_set_d_op(dentry, &cgroup_dentry_operations);
-        d_add(dentry, NULL);
-        return NULL;
-}
-
 static int cgroup_create_file(struct dentry *dentry, mode_t mode,
                                 struct super_block *sb)
 {
diff --git a/kernel/debug/kdb/kdb_main.c b/kernel/debug/kdb/kdb_main.c
index a6e72976682..bd3e8e29caa 100644
--- a/kernel/debug/kdb/kdb_main.c
+++ b/kernel/debug/kdb/kdb_main.c
@@ -2914,7 +2914,7 @@ static void __init kdb_cmd_init(void)
         }
 }
 
-/* Intialize kdb_printf, breakpoint tables and kdb state */
+/* Initialize kdb_printf, breakpoint tables and kdb state */
 void __init kdb_init(int lvl)
 {
         static int kdb_init_lvl = KDB_NOT_INITIALIZED;
diff --git a/kernel/exit.c b/kernel/exit.c
index 89c74861a3d..f9a45ebcc7b 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -994,6 +994,15 @@ NORET_TYPE void do_exit(long code)
         exit_fs(tsk);
         check_stack_usage();
         exit_thread();
+
+        /*
+         * Flush inherited counters to the parent - before the parent
+         * gets woken up by child-exit notifications.
+         *
+         * because of cgroup mode, must be called before cgroup_exit()
+         */
+        perf_event_exit_task(tsk);
+
         cgroup_exit(tsk, 1);
 
         if (group_dead)
@@ -1007,11 +1016,6 @@ NORET_TYPE void do_exit(long code)
          * FIXME: do that only when needed, using sched_exit tracepoint
          */
         flush_ptrace_hw_breakpoint(tsk);
-        /*
-         * Flush inherited counters to the parent - before the parent
-         * gets woken up by child-exit notifications.
-         */
-        perf_event_exit_task(tsk);
 
         exit_notify(tsk, group_dead);
 #ifdef CONFIG_NUMA
diff --git a/kernel/fork.c b/kernel/fork.c
index d9b44f20b6b..25e429152dd 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -66,6 +66,7 @@
 #include <linux/posix-timers.h>
 #include <linux/user-return-notifier.h>
 #include <linux/oom.h>
+#include <linux/khugepaged.h>
 
 #include <asm/pgtable.h>
 #include <asm/pgalloc.h>
@@ -330,6 +331,9 @@ static int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
         retval = ksm_fork(mm, oldmm);
         if (retval)
                 goto out;
+        retval = khugepaged_fork(mm, oldmm);
+        if (retval)
+                goto out;
 
         prev = NULL;
         for (mpnt = oldmm->mmap; mpnt; mpnt = mpnt->vm_next) {
@@ -529,6 +533,9 @@ void __mmdrop(struct mm_struct *mm)
         mm_free_pgd(mm);
         destroy_context(mm);
         mmu_notifier_mm_destroy(mm);
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+        VM_BUG_ON(mm->pmd_huge_pte);
+#endif
         free_mm(mm);
 }
 EXPORT_SYMBOL_GPL(__mmdrop);
@@ -543,6 +550,7 @@ void mmput(struct mm_struct *mm)
         if (atomic_dec_and_test(&mm->mm_users)) {
                 exit_aio(mm);
                 ksm_exit(mm);
+                khugepaged_exit(mm); /* must run before exit_mmap */
                 exit_mmap(mm);
                 set_mm_exe_file(mm, NULL);
                 if (!list_empty(&mm->mmlist)) {
@@ -669,6 +677,10 @@ struct mm_struct *dup_mm(struct task_struct *tsk)
         mm->token_priority = 0;
         mm->last_interval = 0;
 
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+        mm->pmd_huge_pte = NULL;
+#endif
+
         if (!mm_init(mm, tsk))
                 goto fail_nomem;
 
@@ -910,6 +922,7 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
 
         sig->oom_adj = current->signal->oom_adj;
         sig->oom_score_adj = current->signal->oom_score_adj;
+        sig->oom_score_adj_min = current->signal->oom_score_adj_min;
 
         mutex_init(&sig->cred_guard_mutex);
 
@@ -1410,23 +1423,6 @@ long do_fork(unsigned long clone_flags,
         }
 
         /*
-         * We hope to recycle these flags after 2.6.26
-         */
-        if (unlikely(clone_flags & CLONE_STOPPED)) {
-                static int __read_mostly count = 100;
-
-                if (count > 0 && printk_ratelimit()) {
-                        char comm[TASK_COMM_LEN];
-
-                        count--;
-                        printk(KERN_INFO "fork(): process `%s' used deprecated "
-                                        "clone flags 0x%lx\n",
-                                get_task_comm(comm, current),
-                                clone_flags & CLONE_STOPPED);
-                }
-        }
-
-        /*
          * When called from kernel_thread, don't do user tracing stuff.
          */
         if (likely(user_mode(regs)))
@@ -1464,16 +1460,7 @@ long do_fork(unsigned long clone_flags,
                  */
                 p->flags &= ~PF_STARTING;
 
-                if (unlikely(clone_flags & CLONE_STOPPED)) {
-                        /*
-                         * We'll start up with an immediate SIGSTOP.
-                         */
-                        sigaddset(&p->pending.signal, SIGSTOP);
-                        set_tsk_thread_flag(p, TIF_SIGPENDING);
-                        __set_task_state(p, TASK_STOPPED);
-                } else {
-                        wake_up_new_task(p, clone_flags);
-                }
+                wake_up_new_task(p, clone_flags);
 
                 tracehook_report_clone_complete(trace, regs,
                                                 clone_flags, nr, p);
diff --git a/kernel/freezer.c b/kernel/freezer.c
index bd1d42b17cb..66ecd2ead21 100644
--- a/kernel/freezer.c
+++ b/kernel/freezer.c
@@ -104,8 +104,13 @@ bool freeze_task(struct task_struct *p, bool sig_only)
         }
 
         if (should_send_signal(p)) {
-                if (!signal_pending(p))
-                        fake_signal_wake_up(p);
+                fake_signal_wake_up(p);
+                /*
+                 * fake_signal_wake_up() goes through p's scheduler
+                 * lock and guarantees that TASK_STOPPED/TRACED ->
+                 * TASK_RUNNING transition can't race with task state
+                 * testing in try_to_freeze_tasks().
+                 */
         } else if (sig_only) {
                 return false;
         } else {
diff --git a/kernel/futex.c b/kernel/futex.c
index 3019b92e691..b766d28accd 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -233,7 +233,7 @@ get_futex_key(u32 __user *uaddr, int fshared, union futex_key *key)
 {
         unsigned long address = (unsigned long)uaddr;
         struct mm_struct *mm = current->mm;
-        struct page *page;
+        struct page *page, *page_head;
         int err;
 
         /*
@@ -265,11 +265,46 @@ again:
         if (err < 0)
                 return err;
 
-        page = compound_head(page);
-        lock_page(page);
-        if (!page->mapping) {
-                unlock_page(page);
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+        page_head = page;
+        if (unlikely(PageTail(page))) {
                 put_page(page);
+                /* serialize against __split_huge_page_splitting() */
+                local_irq_disable();
+                if (likely(__get_user_pages_fast(address, 1, 1, &page) == 1)) {
+                        page_head = compound_head(page);
+                        /*
+                         * page_head is valid pointer but we must pin
+                         * it before taking the PG_lock and/or
+                         * PG_compound_lock. The moment we re-enable
+                         * irqs __split_huge_page_splitting() can
+                         * return and the head page can be freed from
+                         * under us. We can't take the PG_lock and/or
+                         * PG_compound_lock on a page that could be
+                         * freed from under us.
+                         */
+                        if (page != page_head) {
+                                get_page(page_head);
+                                put_page(page);
+                        }
+                        local_irq_enable();
+                } else {
+                        local_irq_enable();
+                        goto again;
+                }
+        }
+#else
+        page_head = compound_head(page);
+        if (page != page_head) {
+                get_page(page_head);
+                put_page(page);
+        }
+#endif
+
+        lock_page(page_head);
+        if (!page_head->mapping) {
+                unlock_page(page_head);
+                put_page(page_head);
                 goto again;
         }
 
@@ -280,20 +315,20 @@ again:
          * it's a read-only handle, it's expected that futexes attach to
          * the object not the particular process.
          */
-        if (PageAnon(page)) {
+        if (PageAnon(page_head)) {
                 key->both.offset |= FUT_OFF_MMSHARED; /* ref taken on mm */
                 key->private.mm = mm;
                 key->private.address = address;
         } else {
                 key->both.offset |= FUT_OFF_INODE; /* inode-based key */
-                key->shared.inode = page->mapping->host;
-                key->shared.pgoff = page->index;
+                key->shared.inode = page_head->mapping->host;
+                key->shared.pgoff = page_head->index;
         }
 
         get_futex_key_refs(key);
 
-        unlock_page(page);
-        put_page(page);
+        unlock_page(page_head);
+        put_page(page_head);
         return 0;
 }
 
@@ -791,10 +826,9 @@ static int wake_futex_pi(u32 __user *uaddr, u32 uval, struct futex_q *this)
         new_owner = rt_mutex_next_owner(&pi_state->pi_mutex);
 
         /*
-         * This happens when we have stolen the lock and the original
-         * pending owner did not enqueue itself back on the rt_mutex.
-         * Thats not a tragedy. We know that way, that a lock waiter
-         * is on the fly. We make the futex_q waiter the pending owner.
+         * It is possible that the next waiter (the one that brought
+         * this owner to the kernel) timed out and is no longer
+         * waiting on the lock.
          */
         if (!new_owner)
                 new_owner = this->task;
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index 45da2b6920a..0c8d7c04861 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -1745,7 +1745,7 @@ schedule_hrtimeout_range_clock(ktime_t *expires, unsigned long delta,
         }
 
         /*
-         * A NULL parameter means "inifinte"
+         * A NULL parameter means "infinite"
          */
         if (!expires) {
                 schedule();
diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c
index 9988d03797f..282f20230e6 100644
--- a/kernel/irq/irqdesc.c
+++ b/kernel/irq/irqdesc.c
@@ -72,6 +72,8 @@ static inline int desc_node(struct irq_desc *desc) { return 0; }
 
 static void desc_set_defaults(unsigned int irq, struct irq_desc *desc, int node)
 {
+        int cpu;
+
         desc->irq_data.irq = irq;
         desc->irq_data.chip = &no_irq_chip;
         desc->irq_data.chip_data = NULL;
@@ -83,7 +85,8 @@ static void desc_set_defaults(unsigned int irq, struct irq_desc *desc, int node)
         desc->irq_count = 0;
         desc->irqs_unhandled = 0;
         desc->name = NULL;
-        memset(desc->kstat_irqs, 0, nr_cpu_ids * sizeof(*(desc->kstat_irqs)));
+        for_each_possible_cpu(cpu)
+                *per_cpu_ptr(desc->kstat_irqs, cpu) = 0;
         desc_smp_init(desc, node);
 }
 
@@ -133,8 +136,7 @@ static struct irq_desc *alloc_desc(int irq, int node)
         if (!desc)
                 return NULL;
         /* allocate based on nr_cpu_ids */
-        desc->kstat_irqs = kzalloc_node(nr_cpu_ids * sizeof(*desc->kstat_irqs),
-                                         gfp, node);
+        desc->kstat_irqs = alloc_percpu(unsigned int);
         if (!desc->kstat_irqs)
                 goto err_desc;
 
@@ -149,7 +151,7 @@ static struct irq_desc *alloc_desc(int irq, int node)
         return desc;
 
 err_kstat:
-        kfree(desc->kstat_irqs);
+        free_percpu(desc->kstat_irqs);
 err_desc:
         kfree(desc);
         return NULL;
@@ -166,7 +168,7 @@ static void free_desc(unsigned int irq)
         mutex_unlock(&sparse_irq_lock);
 
         free_masks(desc);
-        kfree(desc->kstat_irqs);
+        free_percpu(desc->kstat_irqs);
         kfree(desc);
 }
 
@@ -234,7 +236,6 @@ struct irq_desc irq_desc[NR_IRQS] __cacheline_aligned_in_smp = {
         }
 };
 
-static unsigned int kstat_irqs_all[NR_IRQS][NR_CPUS];
 int __init early_irq_init(void)
 {
         int count, i, node = first_online_node;
@@ -250,7 +251,8 @@ int __init early_irq_init(void)
         for (i = 0; i < count; i++) {
                 desc[i].irq_data.irq = i;
                 desc[i].irq_data.chip = &no_irq_chip;
-                desc[i].kstat_irqs = kstat_irqs_all[i];
+                /* TODO : do this allocation on-demand ... */
+                desc[i].kstat_irqs = alloc_percpu(unsigned int);
                 alloc_masks(desc + i, GFP_KERNEL, node);
                 desc_smp_init(desc + i, node);
                 lockdep_set_class(&desc[i].lock, &irq_desc_lock_class);
@@ -275,6 +277,22 @@ static void free_desc(unsigned int irq)
 
 static inline int alloc_descs(unsigned int start, unsigned int cnt, int node)
 {
+#if defined(CONFIG_KSTAT_IRQS_ONDEMAND)
+        struct irq_desc *desc;
+        unsigned int i;
+
+        for (i = 0; i < cnt; i++) {
+                desc = irq_to_desc(start + i);
+                if (desc && !desc->kstat_irqs) {
+                        unsigned int __percpu *stats = alloc_percpu(unsigned int);
+
+                        if (!stats)
+                                return -1;
+                        if (cmpxchg(&desc->kstat_irqs, NULL, stats) != NULL)
+                                free_percpu(stats);
+                }
+        }
+#endif
         return start;
 }
 #endif /* !CONFIG_SPARSE_IRQ */
@@ -391,7 +409,9 @@ void dynamic_irq_cleanup(unsigned int irq)
 unsigned int kstat_irqs_cpu(unsigned int irq, int cpu)
 {
         struct irq_desc *desc = irq_to_desc(irq);
-        return desc ? desc->kstat_irqs[cpu] : 0;
+
+        return desc && desc->kstat_irqs ?
+                        *per_cpu_ptr(desc->kstat_irqs, cpu) : 0;
 }
 
 #ifdef CONFIG_GENERIC_HARDIRQS
@@ -401,10 +421,10 @@ unsigned int kstat_irqs(unsigned int irq)
         int cpu;
         int sum = 0;
 
-        if (!desc)
+        if (!desc || !desc->kstat_irqs)
                 return 0;
         for_each_possible_cpu(cpu)
-                sum += desc->kstat_irqs[cpu];
+                sum += *per_cpu_ptr(desc->kstat_irqs, cpu);
         return sum;
 }
 #endif /* CONFIG_GENERIC_HARDIRQS */
diff --git a/kernel/kexec.c b/kernel/kexec.c
index b55045bc756..ec19b92c7eb 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -163,7 +163,7 @@ static int do_kimage_alloc(struct kimage **rimage, unsigned long entry,
          * just verifies it is an address we can use.
          *
          * Since the kernel does everything in page size chunks ensure
-         * the destination addreses are page aligned.  Too many
+         * the destination addresses are page aligned.  Too many
          * special cases crop of when we don't do this.  The most
          * insidious is getting overlapping destination addresses
          * simply because addresses are changed to page size
diff --git a/kernel/latencytop.c b/kernel/latencytop.c
index 17110a4a4fc..ee74b35e528 100644
--- a/kernel/latencytop.c
+++ b/kernel/latencytop.c
@@ -241,24 +241,19 @@ static int lstats_show(struct seq_file *m, void *v)
         seq_puts(m, "Latency Top version : v0.1\n");
 
         for (i = 0; i < MAXLR; i++) {
-                if (latency_record[i].backtrace[0]) {
+                struct latency_record *lr = &latency_record[i];
+
+                if (lr->backtrace[0]) {
                         int q;
-                        seq_printf(m, "%i %lu %lu ",
-                                latency_record[i].count,
-                                latency_record[i].time,
-                                latency_record[i].max);
+                        seq_printf(m, "%i %lu %lu",
+                                   lr->count, lr->time, lr->max);
                         for (q = 0; q < LT_BACKTRACEDEPTH; q++) {
-                                char sym[KSYM_SYMBOL_LEN];
-                                char *c;
-                                if (!latency_record[i].backtrace[q])
+                                unsigned long bt = lr->backtrace[q];
+                                if (!bt)
                                         break;
-                                if (latency_record[i].backtrace[q] == ULONG_MAX)
+                                if (bt == ULONG_MAX)
                                         break;
-                                sprint_symbol(sym, latency_record[i].backtrace[q]);
-                                c = strchr(sym, '+');
-                                if (c)
-                                        *c = 0;
-                                seq_printf(m, "%s ", sym);
+                                seq_printf(m, " %ps", (void *)bt);
                         }
                         seq_printf(m, "\n");
                 }
diff --git a/kernel/panic.c b/kernel/panic.c
index 4c13b1a88eb..991bb87a170 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -34,6 +34,7 @@ static int pause_on_oops_flag;
 static DEFINE_SPINLOCK(pause_on_oops_lock);
 
 int panic_timeout;
+EXPORT_SYMBOL_GPL(panic_timeout);
 
 ATOMIC_NOTIFIER_HEAD(panic_notifier_list);
 
diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index 11847bf1e8c..84522c79698 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -38,6 +38,12 @@
 
 #include <asm/irq_regs.h>
 
+enum event_type_t {
+        EVENT_FLEXIBLE = 0x1,
+        EVENT_PINNED = 0x2,
+        EVENT_ALL = EVENT_FLEXIBLE | EVENT_PINNED,
+};
+
 atomic_t perf_task_events __read_mostly;
 static atomic_t nr_mmap_events __read_mostly;
 static atomic_t nr_comm_events __read_mostly;
@@ -65,6 +71,12 @@ int sysctl_perf_event_sample_rate __read_mostly = 100000;
 
 static atomic64_t perf_event_id;
 
+static void cpu_ctx_sched_out(struct perf_cpu_context *cpuctx,
+                              enum event_type_t event_type);
+
+static void cpu_ctx_sched_in(struct perf_cpu_context *cpuctx,
+                             enum event_type_t event_type);
+
 void __weak perf_event_print_debug(void)        { }
 
 extern __weak const char *perf_pmu_name(void)
@@ -72,6 +84,11 @@ extern __weak const char *perf_pmu_name(void)
         return "pmu";
 }
 
+static inline u64 perf_clock(void)
+{
+        return local_clock();
+}
+
 void perf_pmu_disable(struct pmu *pmu)
 {
         int *count = this_cpu_ptr(pmu->pmu_disable_count);
@@ -240,11 +257,6 @@ static void perf_unpin_context(struct perf_event_context *ctx)
         put_ctx(ctx);
 }
 
-static inline u64 perf_clock(void)
-{
-        return local_clock();
-}
-
 /*
  * Update the record of the current time in a context.
  */
@@ -256,6 +268,12 @@ static void update_context_time(struct perf_event_context *ctx)
         ctx->timestamp = now;
 }
 
+static u64 perf_event_time(struct perf_event *event)
+{
+        struct perf_event_context *ctx = event->ctx;
+        return ctx ? ctx->time : 0;
+}
+
 /*
  * Update the total_time_enabled and total_time_running fields for a event.
  */
@@ -269,7 +287,7 @@ static void update_event_times(struct perf_event *event)
                 return;
 
         if (ctx->is_active)
-                run_end = ctx->time;
+                run_end = perf_event_time(event);
         else
                 run_end = event->tstamp_stopped;
 
@@ -278,7 +296,7 @@ static void update_event_times(struct perf_event *event)
         if (event->state == PERF_EVENT_STATE_INACTIVE)
                 run_end = event->tstamp_stopped;
         else
-                run_end = ctx->time;
+                run_end = perf_event_time(event);
 
         event->total_time_running = run_end - event->tstamp_running;
 }
@@ -534,6 +552,7 @@ event_sched_out(struct perf_event *event,
                   struct perf_cpu_context *cpuctx,
                   struct perf_event_context *ctx)
 {
+        u64 tstamp = perf_event_time(event);
         u64 delta;
         /*
          * An event which could not be activated because of
@@ -545,7 +564,7 @@ event_sched_out(struct perf_event *event,
             && !event_filter_match(event)) {
                 delta = ctx->time - event->tstamp_stopped;
                 event->tstamp_running += delta;
-                event->tstamp_stopped = ctx->time;
+                event->tstamp_stopped = tstamp;
         }
 
         if (event->state != PERF_EVENT_STATE_ACTIVE)
@@ -556,7 +575,7 @@ event_sched_out(struct perf_event *event,
                 event->pending_disable = 0;
                 event->state = PERF_EVENT_STATE_OFF;
         }
-        event->tstamp_stopped = ctx->time;
+        event->tstamp_stopped = tstamp;
         event->pmu->del(event, 0);
         event->oncpu = -1;
 
@@ -768,6 +787,8 @@ event_sched_in(struct perf_event *event,
                  struct perf_cpu_context *cpuctx,
                  struct perf_event_context *ctx)
 {
+        u64 tstamp = perf_event_time(event);
+
         if (event->state <= PERF_EVENT_STATE_OFF)
                 return 0;
 
@@ -784,9 +805,9 @@ event_sched_in(struct perf_event *event,
                 return -EAGAIN;
         }
 
-        event->tstamp_running += ctx->time - event->tstamp_stopped;
+        event->tstamp_running += tstamp - event->tstamp_stopped;
 
-        event->shadow_ctx_time = ctx->time - ctx->timestamp;
+        event->shadow_ctx_time = tstamp - ctx->timestamp;
 
         if (!is_software_event(event))
                 cpuctx->active_oncpu++;
@@ -898,11 +919,13 @@ static int group_can_go_on(struct perf_event *event,
 static void add_event_to_ctx(struct perf_event *event,
                                struct perf_event_context *ctx)
 {
+        u64 tstamp = perf_event_time(event);
+
         list_add_event(event, ctx);
         perf_group_attach(event);
-        event->tstamp_enabled = ctx->time;
-        event->tstamp_running = ctx->time;
-        event->tstamp_stopped = ctx->time;
+        event->tstamp_enabled = tstamp;
+        event->tstamp_running = tstamp;
+        event->tstamp_stopped = tstamp;
 }
 
 /*
@@ -937,7 +960,7 @@ static void __perf_install_in_context(void *info)
 
         add_event_to_ctx(event, ctx);
 
-        if (event->cpu != -1 && event->cpu != smp_processor_id())
+        if (!event_filter_match(event))
                 goto unlock;
 
         /*
@@ -1042,14 +1065,13 @@ static void __perf_event_mark_enabled(struct perf_event *event,
                                         struct perf_event_context *ctx)
 {
         struct perf_event *sub;
+        u64 tstamp = perf_event_time(event);
 
         event->state = PERF_EVENT_STATE_INACTIVE;
-        event->tstamp_enabled = ctx->time - event->total_time_enabled;
+        event->tstamp_enabled = tstamp - event->total_time_enabled;
         list_for_each_entry(sub, &event->sibling_list, group_entry) {
-                if (sub->state >= PERF_EVENT_STATE_INACTIVE) {
-                        sub->tstamp_enabled =
-                                ctx->time - sub->total_time_enabled;
-                }
+                if (sub->state >= PERF_EVENT_STATE_INACTIVE)
+                        sub->tstamp_enabled = tstamp - sub->total_time_enabled;
         }
 }
 
@@ -1082,7 +1104,7 @@ static void __perf_event_enable(void *info)
                 goto unlock;
         __perf_event_mark_enabled(event, ctx);
 
-        if (event->cpu != -1 && event->cpu != smp_processor_id())
+        if (!event_filter_match(event))
                 goto unlock;
 
         /*
@@ -1193,12 +1215,6 @@ static int perf_event_refresh(struct perf_event *event, int refresh)
         return 0;
 }
 
-enum event_type_t {
-        EVENT_FLEXIBLE = 0x1,
-        EVENT_PINNED = 0x2,
-        EVENT_ALL = EVENT_FLEXIBLE | EVENT_PINNED,
-};
-
 static void ctx_sched_out(struct perf_event_context *ctx,
                           struct perf_cpu_context *cpuctx,
                           enum event_type_t event_type)
@@ -1435,7 +1451,7 @@ ctx_pinned_sched_in(struct perf_event_context *ctx,
         list_for_each_entry(event, &ctx->pinned_groups, group_entry) {
                 if (event->state <= PERF_EVENT_STATE_OFF)
                         continue;
-                if (event->cpu != -1 && event->cpu != smp_processor_id())
+                if (!event_filter_match(event))
                         continue;
 
                 if (group_can_go_on(event, cpuctx, 1))
@@ -1467,7 +1483,7 @@ ctx_flexible_sched_in(struct perf_event_context *ctx,
                  * Listen to the 'cpu' scheduling filter constraint
                  * of events:
                  */
-                if (event->cpu != -1 && event->cpu != smp_processor_id())
+                if (!event_filter_match(event))
                         continue;
 
                 if (group_can_go_on(event, cpuctx, can_add_hw)) {
@@ -1694,7 +1710,7 @@ static void perf_ctx_adjust_freq(struct perf_event_context *ctx, u64 period)
                 if (event->state != PERF_EVENT_STATE_ACTIVE)
                         continue;
 
-                if (event->cpu != -1 && event->cpu != smp_processor_id())
+                if (!event_filter_match(event))
                         continue;
 
                 hwc = &event->hw;
@@ -2212,14 +2228,11 @@ find_get_context(struct pmu *pmu, struct task_struct *task, int cpu)
         unsigned long flags;
         int ctxn, err;
 
-        if (!task && cpu != -1) {
+        if (!task) {
                 /* Must be root to operate on a CPU event: */
                 if (perf_paranoid_cpu() && !capable(CAP_SYS_ADMIN))
                         return ERR_PTR(-EACCES);
 
-                if (cpu < 0 || cpu >= nr_cpumask_bits)
-                        return ERR_PTR(-EINVAL);
-
                 /*
                  * We could be clever and allow to attach a event to an
                  * offline CPU and activate it when the CPU comes up, but
@@ -3893,7 +3906,7 @@ static int perf_event_task_match(struct perf_event *event)
         if (event->state < PERF_EVENT_STATE_INACTIVE)
                 return 0;
 
-        if (event->cpu != -1 && event->cpu != smp_processor_id())
+        if (!event_filter_match(event))
                 return 0;
 
         if (event->attr.comm || event->attr.mmap ||
@@ -4030,7 +4043,7 @@ static int perf_event_comm_match(struct perf_event *event)
         if (event->state < PERF_EVENT_STATE_INACTIVE)
                 return 0;
 
-        if (event->cpu != -1 && event->cpu != smp_processor_id())
+        if (!event_filter_match(event))
                 return 0;
 
         if (event->attr.comm)
@@ -4178,7 +4191,7 @@ static int perf_event_mmap_match(struct perf_event *event,
         if (event->state < PERF_EVENT_STATE_INACTIVE)
                 return 0;
 
-        if (event->cpu != -1 && event->cpu != smp_processor_id())
+        if (!event_filter_match(event))
                 return 0;
 
         if ((!executable && event->attr.mmap_data) ||
@@ -4648,7 +4661,7 @@ int perf_swevent_get_recursion_context(void)
 }
 EXPORT_SYMBOL_GPL(perf_swevent_get_recursion_context);
 
-void inline perf_swevent_put_recursion_context(int rctx)
+inline void perf_swevent_put_recursion_context(int rctx)
 {
         struct swevent_htable *swhash = &__get_cpu_var(swevent_htable);
 
@@ -5525,6 +5538,11 @@ perf_event_alloc(struct perf_event_attr *attr, int cpu,
         struct hw_perf_event *hwc;
         long err;
 
+        if ((unsigned)cpu >= nr_cpu_ids) {
+                if (!task || cpu != -1)
+                        return ERR_PTR(-EINVAL);
+        }
+
         event = kzalloc(sizeof(*event), GFP_KERNEL);
         if (!event)
                 return ERR_PTR(-ENOMEM);
@@ -5573,7 +5591,7 @@ perf_event_alloc(struct perf_event_attr *attr, int cpu,
 
         if (!overflow_handler && parent_event)
                 overflow_handler = parent_event->overflow_handler;
-        
+
         event->overflow_handler = overflow_handler;
 
         if (attr->disabled)
@@ -6478,7 +6496,6 @@ int perf_event_init_context(struct task_struct *child, int ctxn)
 
         raw_spin_lock_irqsave(&parent_ctx->lock, flags);
         parent_ctx->rotate_disable = 0;
-        raw_spin_unlock_irqrestore(&parent_ctx->lock, flags);
 
         child_ctx = child->perf_event_ctxp[ctxn];
 
@@ -6486,12 +6503,11 @@ int perf_event_init_context(struct task_struct *child, int ctxn)
                 /*
                  * Mark the child context as a clone of the parent
                  * context, or of whatever the parent is a clone of.
-                 * Note that if the parent is a clone, it could get
-                 * uncloned at any point, but that doesn't matter
-                 * because the list of events and the generation
-                 * count can't have changed since we took the mutex.
+                 *
+                 * Note that if the parent is a clone, the holding of
+                 * parent_ctx->lock avoids it from being uncloned.
                  */
-                cloned_ctx = rcu_dereference(parent_ctx->parent_ctx);
+                cloned_ctx = parent_ctx->parent_ctx;
                 if (cloned_ctx) {
                         child_ctx->parent_ctx = cloned_ctx;
                         child_ctx->parent_gen = parent_ctx->parent_gen;
@@ -6502,6 +6518,7 @@ int perf_event_init_context(struct task_struct *child, int ctxn)
                 get_ctx(child_ctx->parent_ctx);
         }
 
+        raw_spin_unlock_irqrestore(&parent_ctx->lock, flags);
         mutex_unlock(&parent_ctx->mutex);
 
         perf_unpin_context(parent_ctx);
diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig
index a5aff3ebad3..265729966ec 100644
--- a/kernel/power/Kconfig
+++ b/kernel/power/Kconfig
@@ -100,13 +100,9 @@ config PM_SLEEP_ADVANCED_DEBUG
         depends on PM_ADVANCED_DEBUG
         default n
 
-config SUSPEND_NVS
-       bool
-
 config SUSPEND
         bool "Suspend to RAM and standby"
         depends on PM && ARCH_SUSPEND_POSSIBLE
-        select SUSPEND_NVS if HAS_IOMEM
         default y
         ---help---
           Allow the system to enter sleep states in which main memory is
@@ -140,7 +136,6 @@ config HIBERNATION
         depends on PM && SWAP && ARCH_HIBERNATION_POSSIBLE
         select LZO_COMPRESS
         select LZO_DECOMPRESS
-        select SUSPEND_NVS if HAS_IOMEM
         ---help---
           Enable the suspend to disk (STD) functionality, which is usually
           called "hibernation" in user interfaces.  STD checkpoints the
diff --git a/kernel/power/Makefile b/kernel/power/Makefile
index f9063c6b185..c350e18b53e 100644
--- a/kernel/power/Makefile
+++ b/kernel/power/Makefile
@@ -1,7 +1,4 @@
-
-ifeq ($(CONFIG_PM_DEBUG),y)
-EXTRA_CFLAGS    +=      -DDEBUG
-endif
+ccflags-$(CONFIG_PM_DEBUG)      :=      -DDEBUG
 
 obj-$(CONFIG_PM)                += main.o
 obj-$(CONFIG_PM_SLEEP)          += console.o
@@ -10,6 +7,5 @@ obj-$(CONFIG_SUSPEND)		+= suspend.o
 obj-$(CONFIG_PM_TEST_SUSPEND)   += suspend_test.o
 obj-$(CONFIG_HIBERNATION)       += hibernate.o snapshot.o swap.o user.o \
                                    block_io.o
-obj-$(CONFIG_SUSPEND_NVS)       += nvs.o
 
 obj-$(CONFIG_MAGIC_SYSRQ)       += poweroff.o
diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index 048d0b51483..1832bd26421 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -51,18 +51,18 @@ enum {
 
 static int hibernation_mode = HIBERNATION_SHUTDOWN;
 
-static struct platform_hibernation_ops *hibernation_ops;
+static const struct platform_hibernation_ops *hibernation_ops;
 
 /**
  * hibernation_set_ops - set the global hibernate operations
  * @ops: the hibernation operations to use in subsequent hibernation transitions
  */
 
-void hibernation_set_ops(struct platform_hibernation_ops *ops)
+void hibernation_set_ops(const struct platform_hibernation_ops *ops)
 {
         if (ops && !(ops->begin && ops->end &&  ops->pre_snapshot
             && ops->prepare && ops->finish && ops->enter && ops->pre_restore
-            && ops->restore_cleanup)) {
+            && ops->restore_cleanup && ops->leave)) {
                 WARN_ON(1);
                 return;
         }
@@ -278,7 +278,7 @@ static int create_image(int platform_mode)
                 goto Enable_irqs;
         }
 
-        if (hibernation_test(TEST_CORE) || !pm_check_wakeup_events())
+        if (hibernation_test(TEST_CORE) || pm_wakeup_pending())
                 goto Power_up;
 
         in_suspend = 1;
@@ -516,7 +516,7 @@ int hibernation_platform_enter(void)
 
         local_irq_disable();
         sysdev_suspend(PMSG_HIBERNATE);
-        if (!pm_check_wakeup_events()) {
+        if (pm_wakeup_pending()) {
                 error = -EAGAIN;
                 goto Power_up;
         }
@@ -647,6 +647,7 @@ int hibernate(void)
                 swsusp_free();
                 if (!error)
                         power_down();
+                in_suspend = 0;
                 pm_restore_gfp_mask();
         } else {
                 pr_debug("PM: Image restored successfully.\n");
diff --git a/kernel/power/nvs.c b/kernel/power/nvs.c
deleted file mode 100644
index 1836db60bbb..00000000000
--- a/kernel/power/nvs.c
+++ /dev/null
@@ -1,136 +0,0 @@
-/*
- * linux/kernel/power/hibernate_nvs.c - Routines for handling NVS memory
- *
- * Copyright (C) 2008,2009 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
- *
- * This file is released under the GPLv2.
- */
-
-#include <linux/io.h>
-#include <linux/kernel.h>
-#include <linux/list.h>
-#include <linux/mm.h>
-#include <linux/slab.h>
-#include <linux/suspend.h>
-
-/*
- * Platforms, like ACPI, may want us to save some memory used by them during
- * suspend and to restore the contents of this memory during the subsequent
- * resume.  The code below implements a mechanism allowing us to do that.
- */
-
-struct nvs_page {
-        unsigned long phys_start;
-        unsigned int size;
-        void *kaddr;
-        void *data;
-        struct list_head node;
-};
-
-static LIST_HEAD(nvs_list);
-
-/**
- *      suspend_nvs_register - register platform NVS memory region to save
- *      @start - physical address of the region
- *      @size - size of the region
- *
- *      The NVS region need not be page-aligned (both ends) and we arrange
- *      things so that the data from page-aligned addresses in this region will
- *      be copied into separate RAM pages.
- */
-int suspend_nvs_register(unsigned long start, unsigned long size)
-{
-        struct nvs_page *entry, *next;
-
-        while (size > 0) {
-                unsigned int nr_bytes;
-
-                entry = kzalloc(sizeof(struct nvs_page), GFP_KERNEL);
-                if (!entry)
-                        goto Error;
-
-                list_add_tail(&entry->node, &nvs_list);
-                entry->phys_start = start;
-                nr_bytes = PAGE_SIZE - (start & ~PAGE_MASK);
-                entry->size = (size < nr_bytes) ? size : nr_bytes;
-
-                start += entry->size;
-                size -= entry->size;
-        }
-        return 0;
-
- Error:
-        list_for_each_entry_safe(entry, next, &nvs_list, node) {
-                list_del(&entry->node);
-                kfree(entry);
-        }
-        return -ENOMEM;
-}
-
-/**
- *      suspend_nvs_free - free data pages allocated for saving NVS regions
- */
-void suspend_nvs_free(void)
-{
-        struct nvs_page *entry;
-
-        list_for_each_entry(entry, &nvs_list, node)
-                if (entry->data) {
-                        free_page((unsigned long)entry->data);
-                        entry->data = NULL;
-                        if (entry->kaddr) {
-                                iounmap(entry->kaddr);
-                                entry->kaddr = NULL;
-                        }
-                }
-}
-
-/**
- *      suspend_nvs_alloc - allocate memory necessary for saving NVS regions
- */
-int suspend_nvs_alloc(void)
-{
-        struct nvs_page *entry;
-
-        list_for_each_entry(entry, &nvs_list, node) {
-                entry->data = (void *)__get_free_page(GFP_KERNEL);
-                if (!entry->data) {
-                        suspend_nvs_free();
-                        return -ENOMEM;
-                }
-        }
-        return 0;
-}
-
-/**
- *      suspend_nvs_save - save NVS memory regions
- */
-void suspend_nvs_save(void)
-{
-        struct nvs_page *entry;
-
-        printk(KERN_INFO "PM: Saving platform NVS memory\n");
-
-        list_for_each_entry(entry, &nvs_list, node)
-                if (entry->data) {
-                        entry->kaddr = ioremap(entry->phys_start, entry->size);
-                        memcpy(entry->data, entry->kaddr, entry->size);
-                }
-}
-
-/**
- *      suspend_nvs_restore - restore NVS memory regions
- *
- *      This function is going to be called with interrupts disabled, so it
- *      cannot iounmap the virtual addresses used to access the NVS region.
- */
-void suspend_nvs_restore(void)
-{
-        struct nvs_page *entry;
-
-        printk(KERN_INFO "PM: Restoring platform NVS memory\n");
-
-        list_for_each_entry(entry, &nvs_list, node)
-                if (entry->data)
-                        memcpy(entry->kaddr, entry->data, entry->size);
-}
diff --git a/kernel/power/process.c b/kernel/power/process.c
index e50b4c1b2a0..d6d2a10320e 100644
--- a/kernel/power/process.c
+++ b/kernel/power/process.c
@@ -64,6 +64,12 @@ static int try_to_freeze_tasks(bool sig_only)
                          * perturb a task in TASK_STOPPED or TASK_TRACED.
                          * It is "frozen enough".  If the task does wake
                          * up, it will immediately call try_to_freeze.
+                         *
+                         * Because freeze_task() goes through p's
+                         * scheduler lock after setting TIF_FREEZE, it's
+                         * guaranteed that either we see TASK_RUNNING or
+                         * try_to_stop() after schedule() in ptrace/signal
+                         * stop sees TIF_FREEZE.
                          */
                         if (!task_is_stopped_or_traced(p) &&
                             !freezer_should_skip(p))
@@ -79,7 +85,7 @@ static int try_to_freeze_tasks(bool sig_only)
                 if (!todo || time_after(jiffies, end_time))
                         break;
 
-                if (!pm_check_wakeup_events()) {
+                if (pm_wakeup_pending()) {
                         wakeup = true;
                         break;
                 }
diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c
index 031d5e3a619..de6f86bfa30 100644
--- a/kernel/power/suspend.c
+++ b/kernel/power/suspend.c
@@ -31,13 +31,13 @@ const char *const pm_states[PM_SUSPEND_MAX] = {
         [PM_SUSPEND_MEM]        = "mem",
 };
 
-static struct platform_suspend_ops *suspend_ops;
+static const struct platform_suspend_ops *suspend_ops;
 
 /**
  *      suspend_set_ops - Set the global suspend method table.
  *      @ops:   Pointer to ops structure.
  */
-void suspend_set_ops(struct platform_suspend_ops *ops)
+void suspend_set_ops(const struct platform_suspend_ops *ops)
 {
         mutex_lock(&pm_mutex);
         suspend_ops = ops;
@@ -164,7 +164,7 @@ static int suspend_enter(suspend_state_t state)
 
         error = sysdev_suspend(PMSG_SUSPEND);
         if (!error) {
-                if (!suspend_test(TEST_CORE) && pm_check_wakeup_events()) {
+                if (!(suspend_test(TEST_CORE) || pm_wakeup_pending())) {
                         error = suspend_ops->enter(state);
                         events_check_enabled = false;
                 }
diff --git a/kernel/power/swap.c b/kernel/power/swap.c
index 8c7e4832b9b..7c97c3a0eee 100644
--- a/kernel/power/swap.c
+++ b/kernel/power/swap.c
@@ -224,7 +224,7 @@ static int swsusp_swap_check(void)
                 return res;
 
         root_swap = res;
-        res = blkdev_get(hib_resume_bdev, FMODE_WRITE);
+        res = blkdev_get(hib_resume_bdev, FMODE_WRITE, NULL);
         if (res)
                 return res;
 
@@ -888,7 +888,7 @@ out_finish:
 /**
  *      swsusp_read - read the hibernation image.
  *      @flags_p: flags passed by the "frozen" kernel in the image header should
- *                be written into this memeory location
+ *                be written into this memory location
  */
 
 int swsusp_read(unsigned int *flags_p)
@@ -930,7 +930,8 @@ int swsusp_check(void)
 {
         int error;
 
-        hib_resume_bdev = open_by_devnum(swsusp_resume_device, FMODE_READ);
+        hib_resume_bdev = blkdev_get_by_dev(swsusp_resume_device,
+                                            FMODE_READ, NULL);
         if (!IS_ERR(hib_resume_bdev)) {
                 set_blocksize(hib_resume_bdev, PAGE_SIZE);
                 clear_page(swsusp_header);
diff --git a/kernel/printk.c b/kernel/printk.c
index 4642a5c439e..53d9a9ec88e 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -39,6 +39,7 @@
 #include <linux/syslog.h>
 #include <linux/cpu.h>
 #include <linux/notifier.h>
+#include <linux/rculist.h>
 
 #include <asm/uaccess.h>
 
@@ -273,12 +274,12 @@ int do_syslog(int type, char __user *buf, int len, bool from_file)
          * at open time.
          */
         if (type == SYSLOG_ACTION_OPEN || !from_file) {
-                if (dmesg_restrict && !capable(CAP_SYS_ADMIN))
-                        return -EPERM;
+                if (dmesg_restrict && !capable(CAP_SYSLOG))
+                        goto warn; /* switch to return -EPERM after 2.6.39 */
                 if ((type != SYSLOG_ACTION_READ_ALL &&
                      type != SYSLOG_ACTION_SIZE_BUFFER) &&
-                    !capable(CAP_SYS_ADMIN))
-                        return -EPERM;
+                    !capable(CAP_SYSLOG))
+                        goto warn; /* switch to return -EPERM after 2.6.39 */
         }
 
         error = security_syslog(type);
@@ -422,6 +423,12 @@ int do_syslog(int type, char __user *buf, int len, bool from_file)
         }
 out:
         return error;
+warn:
+        /* remove after 2.6.39 */
+        if (capable(CAP_SYS_ADMIN))
+                WARN_ONCE(1, "Attempt to access syslog with CAP_SYS_ADMIN "
+                  "but no CAP_SYSLOG (deprecated and denied).\n");
+        return -EPERM;
 }
 
 SYSCALL_DEFINE3(syslog, int, type, char __user *, buf, int, len)
@@ -1496,7 +1503,7 @@ int kmsg_dump_register(struct kmsg_dumper *dumper)
         /* Don't allow registering multiple times */
         if (!dumper->registered) {
                 dumper->registered = 1;
-                list_add_tail(&dumper->list, &dump_list);
+                list_add_tail_rcu(&dumper->list, &dump_list);
                 err = 0;
         }
         spin_unlock_irqrestore(&dump_list_lock, flags);
@@ -1520,29 +1527,16 @@ int kmsg_dump_unregister(struct kmsg_dumper *dumper)
         spin_lock_irqsave(&dump_list_lock, flags);
         if (dumper->registered) {
                 dumper->registered = 0;
-                list_del(&dumper->list);
+                list_del_rcu(&dumper->list);
                 err = 0;
         }
         spin_unlock_irqrestore(&dump_list_lock, flags);
+        synchronize_rcu();
 
         return err;
 }
 EXPORT_SYMBOL_GPL(kmsg_dump_unregister);
 
-static const char * const kmsg_reasons[] = {
-        [KMSG_DUMP_OOPS]        = "oops",
-        [KMSG_DUMP_PANIC]       = "panic",
-        [KMSG_DUMP_KEXEC]       = "kexec",
-};
-
-static const char *kmsg_to_str(enum kmsg_dump_reason reason)
-{
-        if (reason >= ARRAY_SIZE(kmsg_reasons) || reason < 0)
-                return "unknown";
-
-        return kmsg_reasons[reason];
-}
-
 /**
  * kmsg_dump - dump kernel log to kernel message dumpers.
  * @reason: the reason (oops, panic etc) for dumping
@@ -1581,13 +1575,9 @@ void kmsg_dump(enum kmsg_dump_reason reason)
                 l2 = chars;
         }
 
-        if (!spin_trylock_irqsave(&dump_list_lock, flags)) {
-                printk(KERN_ERR "dump_kmsg: dump list lock is held during %s, skipping dump\n",
-                                kmsg_to_str(reason));
-                return;
-        }
-        list_for_each_entry(dumper, &dump_list, list)
+        rcu_read_lock();
+        list_for_each_entry_rcu(dumper, &dump_list, list)
                 dumper->dump(dumper, reason, s1, l1, s2, l2);
-        spin_unlock_irqrestore(&dump_list_lock, flags);
+        rcu_read_unlock();
 }
 #endif
diff --git a/kernel/rcutiny.c b/kernel/rcutiny.c
index 03449372474..0c343b9a46d 100644
--- a/kernel/rcutiny.c
+++ b/kernel/rcutiny.c
@@ -189,7 +189,8 @@ static int rcu_kthread(void *arg)
         unsigned long flags;
 
         for (;;) {
-                wait_event(rcu_kthread_wq, have_rcu_kthread_work != 0);
+                wait_event_interruptible(rcu_kthread_wq,
+                                         have_rcu_kthread_work != 0);
                 morework = rcu_boost();
                 local_irq_save(flags);
                 work = have_rcu_kthread_work;
diff --git a/kernel/sched.c b/kernel/sched.c
index a0eb0941fa8..ea3e5eff387 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -2505,7 +2505,7 @@ out:
  * try_to_wake_up_local - try to wake up a local task with rq lock held
  * @p: the thread to be awakened
  *
- * Put @p on the run-queue if it's not alredy there.  The caller must
+ * Put @p on the run-queue if it's not already there.  The caller must
  * ensure that this_rq() is locked, @p is bound to this_rq() and not
  * the current task.  this_rq() stays locked over invocation.
  */
diff --git a/kernel/smp.c b/kernel/smp.c
index 12ed8b013e2..4ec30e06998 100644
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -13,6 +13,7 @@
 #include <linux/smp.h>
 #include <linux/cpu.h>
 
+#ifdef CONFIG_USE_GENERIC_SMP_HELPERS
 static struct {
         struct list_head        queue;
         raw_spinlock_t          lock;
@@ -529,3 +530,21 @@ void ipi_call_unlock_irq(void)
 {
         raw_spin_unlock_irq(&call_function.lock);
 }
+#endif /* USE_GENERIC_SMP_HELPERS */
+
+/*
+ * Call a function on all processors
+ */
+int on_each_cpu(void (*func) (void *info), void *info, int wait)
+{
+        int ret = 0;
+
+        preempt_disable();
+        ret = smp_call_function(func, info, wait);
+        local_irq_disable();
+        func(info);
+        local_irq_enable();
+        preempt_enable();
+        return ret;
+}
+EXPORT_SYMBOL(on_each_cpu);
diff --git a/kernel/softirq.c b/kernel/softirq.c
index 0823778f87f..68eb5efec38 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -885,25 +885,6 @@ static __init int spawn_ksoftirqd(void)
 }
 early_initcall(spawn_ksoftirqd);
 
-#ifdef CONFIG_SMP
-/*
- * Call a function on all processors
- */
-int on_each_cpu(void (*func) (void *info), void *info, int wait)
-{
-        int ret = 0;
-
-        preempt_disable();
-        ret = smp_call_function(func, info, wait);
-        local_irq_disable();
-        func(info);
-        local_irq_enable();
-        preempt_enable();
-        return ret;
-}
-EXPORT_SYMBOL(on_each_cpu);
-#endif
-
 /*
  * [ These __weak aliases are kept in a separate compilation unit, so that
  *   GCC does not inline them incorrectly. ]
diff --git a/kernel/srcu.c b/kernel/srcu.c
index 98d8c1e80ed..73ce23feaea 100644
--- a/kernel/srcu.c
+++ b/kernel/srcu.c
@@ -156,6 +156,16 @@ void __srcu_read_unlock(struct srcu_struct *sp, int idx)
 EXPORT_SYMBOL_GPL(__srcu_read_unlock);
 
 /*
+ * We use an adaptive strategy for synchronize_srcu() and especially for
+ * synchronize_srcu_expedited().  We spin for a fixed time period
+ * (defined below) to allow SRCU readers to exit their read-side critical
+ * sections.  If there are still some readers after 10 microseconds,
+ * we repeatedly block for 1-millisecond time periods.  This approach
+ * has done well in testing, so there is no need for a config parameter.
+ */
+#define SYNCHRONIZE_SRCU_READER_DELAY 10
+
+/*
  * Helper function for synchronize_srcu() and synchronize_srcu_expedited().
  */
 static void __synchronize_srcu(struct srcu_struct *sp, void (*sync_func)(void))
@@ -207,11 +217,12 @@ static void __synchronize_srcu(struct srcu_struct *sp, void (*sync_func)(void))
          * will have finished executing.  We initially give readers
          * an arbitrarily chosen 10 microseconds to get out of their
          * SRCU read-side critical sections, then loop waiting 1/HZ
-         * seconds per iteration.
+         * seconds per iteration.  The 10-microsecond value has done
+         * very well in testing.
          */
 
         if (srcu_readers_active_idx(sp, idx))
-                udelay(CONFIG_SRCU_SYNCHRONIZE_DELAY);
+                udelay(SYNCHRONIZE_SRCU_READER_DELAY);
         while (srcu_readers_active_idx(sp, idx))
                 schedule_timeout_interruptible(1);
 
diff --git a/kernel/sys.c b/kernel/sys.c
index 2745dcdb6c6..31b71a276b4 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -43,6 +43,8 @@
 #include <linux/kprobes.h>
 #include <linux/user_namespace.h>
 
+#include <linux/kmsg_dump.h>
+
 #include <asm/uaccess.h>
 #include <asm/io.h>
 #include <asm/unistd.h>
@@ -285,6 +287,7 @@ out_unlock:
  */
 void emergency_restart(void)
 {
+        kmsg_dump(KMSG_DUMP_EMERG);
         machine_emergency_restart();
 }
 EXPORT_SYMBOL_GPL(emergency_restart);
@@ -312,6 +315,7 @@ void kernel_restart(char *cmd)
                 printk(KERN_EMERG "Restarting system.\n");
         else
                 printk(KERN_EMERG "Restarting system with command '%s'.\n", cmd);
+        kmsg_dump(KMSG_DUMP_RESTART);
         machine_restart(cmd);
 }
 EXPORT_SYMBOL_GPL(kernel_restart);
@@ -333,6 +337,7 @@ void kernel_halt(void)
         kernel_shutdown_prepare(SYSTEM_HALT);
         sysdev_shutdown();
         printk(KERN_EMERG "System halted.\n");
+        kmsg_dump(KMSG_DUMP_HALT);
         machine_halt();
 }
 
@@ -351,6 +356,7 @@ void kernel_power_off(void)
         disable_nonboot_cpus();
         sysdev_shutdown();
         printk(KERN_EMERG "Power down.\n");
+        kmsg_dump(KMSG_DUMP_POWEROFF);
         machine_power_off();
 }
 EXPORT_SYMBOL_GPL(kernel_power_off);
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index ae5cbb1e3ce..bc86bb32e12 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -24,6 +24,7 @@
 #include <linux/slab.h>
 #include <linux/sysctl.h>
 #include <linux/signal.h>
+#include <linux/printk.h>
 #include <linux/proc_fs.h>
 #include <linux/security.h>
 #include <linux/ctype.h>
@@ -245,10 +246,6 @@ static struct ctl_table root_table[] = {
                 .mode           = 0555,
                 .child          = dev_table,
         },
-/*
- * NOTE: do not add new entries to this table unless you have read
- * Documentation/sysctl/ctl_unnumbered.txt
- */
         { }
 };
 
@@ -710,6 +707,15 @@ static struct ctl_table kern_table[] = {
                 .extra1         = &zero,
                 .extra2         = &one,
         },
+        {
+                .procname       = "kptr_restrict",
+                .data           = &kptr_restrict,
+                .maxlen         = sizeof(int),
+                .mode           = 0644,
+                .proc_handler   = proc_dointvec_minmax,
+                .extra1         = &zero,
+                .extra2         = &two,
+        },
 #endif
         {
                 .procname       = "ngroups_max",
@@ -962,10 +968,6 @@ static struct ctl_table kern_table[] = {
                 .proc_handler   = proc_dointvec,
         },
 #endif
-/*
- * NOTE: do not add new entries to this table unless you have read
- * Documentation/sysctl/ctl_unnumbered.txt
- */
         { }
 };
 
@@ -1326,11 +1328,6 @@ static struct ctl_table vm_table[] = {
                 .extra2         = &one,
         },
 #endif
-
-/*
- * NOTE: do not add new entries to this table unless you have read
- * Documentation/sysctl/ctl_unnumbered.txt
- */
         { }
 };
 
@@ -1486,10 +1483,6 @@ static struct ctl_table fs_table[] = {
                 .proc_handler   = &pipe_proc_fn,
                 .extra1         = &pipe_min_size,
         },
-/*
- * NOTE: do not add new entries to this table unless you have read
- * Documentation/sysctl/ctl_unnumbered.txt
- */
         { }
 };
 
@@ -2899,7 +2892,7 @@ int proc_do_large_bitmap(struct ctl_table *table, int write,
         }
 }
 
-#else /* CONFIG_PROC_FS */
+#else /* CONFIG_PROC_SYSCTL */
 
 int proc_dostring(struct ctl_table *table, int write,
                   void __user *buffer, size_t *lenp, loff_t *ppos)
@@ -2951,7 +2944,7 @@ int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
 }
 
 
-#endif /* CONFIG_PROC_FS */
+#endif /* CONFIG_PROC_SYSCTL */
 
 /*
  * No sense putting this after each symbol definition, twice,
diff --git a/kernel/sysctl_binary.c b/kernel/sysctl_binary.c
index 4b2545a136f..b875bedf7c9 100644
--- a/kernel/sysctl_binary.c
+++ b/kernel/sysctl_binary.c
@@ -1192,7 +1192,7 @@ static ssize_t bin_dn_node_address(struct file *file,
 
                 buf[result] = '\0';
 
-                /* Convert the decnet addresss to binary */
+                /* Convert the decnet address to binary */
                 result = -EIO;
                 nodep = strchr(buf, '.') + 1;
                 if (!nodep)
diff --git a/kernel/taskstats.c b/kernel/taskstats.c
index 69691eb4b71..3971c6b9d58 100644
--- a/kernel/taskstats.c
+++ b/kernel/taskstats.c
@@ -348,7 +348,7 @@ static int parse(struct nlattr *na, struct cpumask *mask)
         return ret;
 }
 
-#ifdef CONFIG_IA64
+#if defined(CONFIG_64BIT) && !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
 #define TASKSTATS_NEEDS_PADDING 1
 #endif
 
diff --git a/kernel/time.c b/kernel/time.c
index ba9b338d183..32174359576 100644
--- a/kernel/time.c
+++ b/kernel/time.c
@@ -238,7 +238,7 @@ EXPORT_SYMBOL(current_fs_time);
  * Avoid unnecessary multiplications/divisions in the
  * two most common HZ cases:
  */
-unsigned int inline jiffies_to_msecs(const unsigned long j)
+inline unsigned int jiffies_to_msecs(const unsigned long j)
 {
 #if HZ <= MSEC_PER_SEC && !(MSEC_PER_SEC % HZ)
         return (MSEC_PER_SEC / HZ) * j;
@@ -254,7 +254,7 @@ unsigned int inline jiffies_to_msecs(const unsigned long j)
 }
 EXPORT_SYMBOL(jiffies_to_msecs);
 
-unsigned int inline jiffies_to_usecs(const unsigned long j)
+inline unsigned int jiffies_to_usecs(const unsigned long j)
 {
 #if HZ <= USEC_PER_SEC && !(USEC_PER_SEC % HZ)
         return (USEC_PER_SEC / HZ) * j;
diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index df140cd3ea4..6519cf62d9c 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -113,7 +113,7 @@ EXPORT_SYMBOL_GPL(timecounter_cyc2time);
  * @shift:      pointer to shift variable
  * @from:       frequency to convert from
  * @to:         frequency to convert to
- * @minsec:     guaranteed runtime conversion range in seconds
+ * @maxsec:     guaranteed runtime conversion range in seconds
  *
  * The function evaluates the shift/mult pair for the scaled math
  * operations of clocksources and clockevents.
@@ -122,7 +122,7 @@ EXPORT_SYMBOL_GPL(timecounter_cyc2time);
  * NSEC_PER_SEC == 1GHz and @from is the counter frequency. For clock
  * event @to is the counter frequency and @from is NSEC_PER_SEC.
  *
- * The @minsec conversion range argument controls the time frame in
+ * The @maxsec conversion range argument controls the time frame in
  * seconds which must be covered by the runtime conversion with the
  * calculated mult and shift factors. This guarantees that no 64bit
  * overflow happens when the input value of the conversion is
@@ -131,7 +131,7 @@ EXPORT_SYMBOL_GPL(timecounter_cyc2time);
  * factors.
  */
 void
-clocks_calc_mult_shift(u32 *mult, u32 *shift, u32 from, u32 to, u32 minsec)
+clocks_calc_mult_shift(u32 *mult, u32 *shift, u32 from, u32 to, u32 maxsec)
 {
         u64 tmp;
         u32 sft, sftacc= 32;
@@ -140,7 +140,7 @@ clocks_calc_mult_shift(u32 *mult, u32 *shift, u32 from, u32 to, u32 minsec)
          * Calculate the shift factor which is limiting the conversion
          * range:
          */
-        tmp = ((u64)minsec * from) >> 32;
+        tmp = ((u64)maxsec * from) >> 32;
         while (tmp) {
                 tmp >>=1;
                 sftacc--;
@@ -679,7 +679,7 @@ EXPORT_SYMBOL_GPL(__clocksource_updatefreq_scale);
 int __clocksource_register_scale(struct clocksource *cs, u32 scale, u32 freq)
 {
 
-        /* Intialize mult/shift and max_idle_ns */
+        /* Initialize mult/shift and max_idle_ns */
         __clocksource_updatefreq_scale(cs, scale, freq);
 
         /* Add clocksource to the clcoksource list */
diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index d2321891538..5c00242fa92 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -14,6 +14,7 @@
 #include <linux/timex.h>
 #include <linux/time.h>
 #include <linux/mm.h>
+#include <linux/module.h>
 
 /*
  * NTP timekeeping variables:
@@ -74,6 +75,162 @@ static long			time_adjust;
 /* constant (boot-param configurable) NTP tick adjustment (upscaled)    */
 static s64                      ntp_tick_adj;
 
+#ifdef CONFIG_NTP_PPS
+
+/*
+ * The following variables are used when a pulse-per-second (PPS) signal
+ * is available. They establish the engineering parameters of the clock
+ * discipline loop when controlled by the PPS signal.
+ */
+#define PPS_VALID       10      /* PPS signal watchdog max (s) */
+#define PPS_POPCORN     4       /* popcorn spike threshold (shift) */
+#define PPS_INTMIN      2       /* min freq interval (s) (shift) */
+#define PPS_INTMAX      8       /* max freq interval (s) (shift) */
+#define PPS_INTCOUNT    4       /* number of consecutive good intervals to
+                                   increase pps_shift or consecutive bad
+                                   intervals to decrease it */
+#define PPS_MAXWANDER   100000  /* max PPS freq wander (ns/s) */
+
+static int pps_valid;           /* signal watchdog counter */
+static long pps_tf[3];          /* phase median filter */
+static long pps_jitter;         /* current jitter (ns) */
+static struct timespec pps_fbase; /* beginning of the last freq interval */
+static int pps_shift;           /* current interval duration (s) (shift) */
+static int pps_intcnt;          /* interval counter */
+static s64 pps_freq;            /* frequency offset (scaled ns/s) */
+static long pps_stabil;         /* current stability (scaled ns/s) */
+
+/*
+ * PPS signal quality monitors
+ */
+static long pps_calcnt;         /* calibration intervals */
+static long pps_jitcnt;         /* jitter limit exceeded */
+static long pps_stbcnt;         /* stability limit exceeded */
+static long pps_errcnt;         /* calibration errors */
+
+
+/* PPS kernel consumer compensates the whole phase error immediately.
+ * Otherwise, reduce the offset by a fixed factor times the time constant.
+ */
+static inline s64 ntp_offset_chunk(s64 offset)
+{
+        if (time_status & STA_PPSTIME && time_status & STA_PPSSIGNAL)
+                return offset;
+        else
+                return shift_right(offset, SHIFT_PLL + time_constant);
+}
+
+static inline void pps_reset_freq_interval(void)
+{
+        /* the PPS calibration interval may end
+           surprisingly early */
+        pps_shift = PPS_INTMIN;
+        pps_intcnt = 0;
+}
+
+/**
+ * pps_clear - Clears the PPS state variables
+ *
+ * Must be called while holding a write on the xtime_lock
+ */
+static inline void pps_clear(void)
+{
+        pps_reset_freq_interval();
+        pps_tf[0] = 0;
+        pps_tf[1] = 0;
+        pps_tf[2] = 0;
+        pps_fbase.tv_sec = pps_fbase.tv_nsec = 0;
+        pps_freq = 0;
+}
+
+/* Decrease pps_valid to indicate that another second has passed since
+ * the last PPS signal. When it reaches 0, indicate that PPS signal is
+ * missing.
+ *
+ * Must be called while holding a write on the xtime_lock
+ */
+static inline void pps_dec_valid(void)
+{
+        if (pps_valid > 0)
+                pps_valid--;
+        else {
+                time_status &= ~(STA_PPSSIGNAL | STA_PPSJITTER |
+                                 STA_PPSWANDER | STA_PPSERROR);
+                pps_clear();
+        }
+}
+
+static inline void pps_set_freq(s64 freq)
+{
+        pps_freq = freq;
+}
+
+static inline int is_error_status(int status)
+{
+        return (time_status & (STA_UNSYNC|STA_CLOCKERR))
+                /* PPS signal lost when either PPS time or
+                 * PPS frequency synchronization requested
+                 */
+                || ((time_status & (STA_PPSFREQ|STA_PPSTIME))
+                        && !(time_status & STA_PPSSIGNAL))
+                /* PPS jitter exceeded when
+                 * PPS time synchronization requested */
+                || ((time_status & (STA_PPSTIME|STA_PPSJITTER))
+                        == (STA_PPSTIME|STA_PPSJITTER))
+                /* PPS wander exceeded or calibration error when
+                 * PPS frequency synchronization requested
+                 */
+                || ((time_status & STA_PPSFREQ)
+                        && (time_status & (STA_PPSWANDER|STA_PPSERROR)));
+}
+
+static inline void pps_fill_timex(struct timex *txc)
+{
+        txc->ppsfreq       = shift_right((pps_freq >> PPM_SCALE_INV_SHIFT) *
+                                         PPM_SCALE_INV, NTP_SCALE_SHIFT);
+        txc->jitter        = pps_jitter;
+        if (!(time_status & STA_NANO))
+                txc->jitter /= NSEC_PER_USEC;
+        txc->shift         = pps_shift;
+        txc->stabil        = pps_stabil;
+        txc->jitcnt        = pps_jitcnt;
+        txc->calcnt        = pps_calcnt;
+        txc->errcnt        = pps_errcnt;
+        txc->stbcnt        = pps_stbcnt;
+}
+
+#else /* !CONFIG_NTP_PPS */
+
+static inline s64 ntp_offset_chunk(s64 offset)
+{
+        return shift_right(offset, SHIFT_PLL + time_constant);
+}
+
+static inline void pps_reset_freq_interval(void) {}
+static inline void pps_clear(void) {}
+static inline void pps_dec_valid(void) {}
+static inline void pps_set_freq(s64 freq) {}
+
+static inline int is_error_status(int status)
+{
+        return status & (STA_UNSYNC|STA_CLOCKERR);
+}
+
+static inline void pps_fill_timex(struct timex *txc)
+{
+        /* PPS is not implemented, so these are zero */
+        txc->ppsfreq       = 0;
+        txc->jitter        = 0;
+        txc->shift         = 0;
+        txc->stabil        = 0;
+        txc->jitcnt        = 0;
+        txc->calcnt        = 0;
+        txc->errcnt        = 0;
+        txc->stbcnt        = 0;
+}
+
+#endif /* CONFIG_NTP_PPS */
+
 /*
  * NTP methods:
  */
@@ -185,6 +342,9 @@ void ntp_clear(void)
 
         tick_length     = tick_length_base;
         time_offset     = 0;
+
+        /* Clear PPS state variables */
+        pps_clear();
 }
 
 /*
@@ -250,16 +410,16 @@ void second_overflow(void)
                 time_status |= STA_UNSYNC;
         }
 
-        /*
-         * Compute the phase adjustment for the next second. The offset is
-         * reduced by a fixed factor times the time constant.
-         */
+        /* Compute the phase adjustment for the next second */
         tick_length      = tick_length_base;
 
-        delta            = shift_right(time_offset, SHIFT_PLL + time_constant);
+        delta            = ntp_offset_chunk(time_offset);
         time_offset     -= delta;
         tick_length     += delta;
 
+        /* Check PPS signal */
+        pps_dec_valid();
+
         if (!time_adjust)
                 return;
 
@@ -369,6 +529,8 @@ static inline void process_adj_status(struct timex *txc, struct timespec *ts)
         if ((time_status & STA_PLL) && !(txc->status & STA_PLL)) {
                 time_state = TIME_OK;
                 time_status = STA_UNSYNC;
+                /* restart PPS frequency calibration */
+                pps_reset_freq_interval();
         }
 
         /*
@@ -418,6 +580,8 @@ static inline void process_adjtimex_modes(struct timex *txc, struct timespec *ts
                 time_freq = txc->freq * PPM_SCALE;
                 time_freq = min(time_freq, MAXFREQ_SCALED);
                 time_freq = max(time_freq, -MAXFREQ_SCALED);
+                /* update pps_freq */
+                pps_set_freq(time_freq);
         }
 
         if (txc->modes & ADJ_MAXERROR)
@@ -508,7 +672,8 @@ int do_adjtimex(struct timex *txc)
         }
 
         result = time_state;    /* mostly `TIME_OK' */
-        if (time_status & (STA_UNSYNC|STA_CLOCKERR))
+        /* check for errors */
+        if (is_error_status(time_status))
                 result = TIME_ERROR;
 
         txc->freq          = shift_right((time_freq >> PPM_SCALE_INV_SHIFT) *
@@ -522,15 +687,8 @@ int do_adjtimex(struct timex *txc)
         txc->tick          = tick_usec;
         txc->tai           = time_tai;
 
-        /* PPS is not implemented, so these are zero */
-        txc->ppsfreq       = 0;
-        txc->jitter        = 0;
-        txc->shift         = 0;
-        txc->stabil        = 0;
-        txc->jitcnt        = 0;
-        txc->calcnt        = 0;
-        txc->errcnt        = 0;
-        txc->stbcnt        = 0;
+        /* fill PPS status fields */
+        pps_fill_timex(txc);
 
         write_sequnlock_irq(&xtime_lock);
 
@@ -544,6 +702,243 @@ int do_adjtimex(struct timex *txc)
         return result;
 }
 
+#ifdef  CONFIG_NTP_PPS
+
+/* actually struct pps_normtime is good old struct timespec, but it is
+ * semantically different (and it is the reason why it was invented):
+ * pps_normtime.nsec has a range of ( -NSEC_PER_SEC / 2, NSEC_PER_SEC / 2 ]
+ * while timespec.tv_nsec has a range of [0, NSEC_PER_SEC) */
+struct pps_normtime {
+        __kernel_time_t sec;    /* seconds */
+        long            nsec;   /* nanoseconds */
+};
+
+/* normalize the timestamp so that nsec is in the
+   ( -NSEC_PER_SEC / 2, NSEC_PER_SEC / 2 ] interval */
+static inline struct pps_normtime pps_normalize_ts(struct timespec ts)
+{
+        struct pps_normtime norm = {
+                .sec = ts.tv_sec,
+                .nsec = ts.tv_nsec
+        };
+
+        if (norm.nsec > (NSEC_PER_SEC >> 1)) {
+                norm.nsec -= NSEC_PER_SEC;
+                norm.sec++;
+        }
+
+        return norm;
+}
+
+/* get current phase correction and jitter */
+static inline long pps_phase_filter_get(long *jitter)
+{
+        *jitter = pps_tf[0] - pps_tf[1];
+        if (*jitter < 0)
+                *jitter = -*jitter;
+
+        /* TODO: test various filters */
+        return pps_tf[0];
+}
+
+/* add the sample to the phase filter */
+static inline void pps_phase_filter_add(long err)
+{
+        pps_tf[2] = pps_tf[1];
+        pps_tf[1] = pps_tf[0];
+        pps_tf[0] = err;
+}
+
+/* decrease frequency calibration interval length.
+ * It is halved after four consecutive unstable intervals.
+ */
+static inline void pps_dec_freq_interval(void)
+{
+        if (--pps_intcnt <= -PPS_INTCOUNT) {
+                pps_intcnt = -PPS_INTCOUNT;
+                if (pps_shift > PPS_INTMIN) {
+                        pps_shift--;
+                        pps_intcnt = 0;
+                }
+        }
+}
+
+/* increase frequency calibration interval length.
+ * It is doubled after four consecutive stable intervals.
+ */
+static inline void pps_inc_freq_interval(void)
+{
+        if (++pps_intcnt >= PPS_INTCOUNT) {
+                pps_intcnt = PPS_INTCOUNT;
+                if (pps_shift < PPS_INTMAX) {
+                        pps_shift++;
+                        pps_intcnt = 0;
+                }
+        }
+}
+
+/* update clock frequency based on MONOTONIC_RAW clock PPS signal
+ * timestamps
+ *
+ * At the end of the calibration interval the difference between the
+ * first and last MONOTONIC_RAW clock timestamps divided by the length
+ * of the interval becomes the frequency update. If the interval was
+ * too long, the data are discarded.
+ * Returns the difference between old and new frequency values.
+ */
+static long hardpps_update_freq(struct pps_normtime freq_norm)
+{
+        long delta, delta_mod;
+        s64 ftemp;
+
+        /* check if the frequency interval was too long */
+        if (freq_norm.sec > (2 << pps_shift)) {
+                time_status |= STA_PPSERROR;
+                pps_errcnt++;
+                pps_dec_freq_interval();
+                pr_err("hardpps: PPSERROR: interval too long - %ld s\n",
+                                freq_norm.sec);
+                return 0;
+        }
+
+        /* here the raw frequency offset and wander (stability) is
+         * calculated. If the wander is less than the wander threshold
+         * the interval is increased; otherwise it is decreased.
+         */
+        ftemp = div_s64(((s64)(-freq_norm.nsec)) << NTP_SCALE_SHIFT,
+                        freq_norm.sec);
+        delta = shift_right(ftemp - pps_freq, NTP_SCALE_SHIFT);
+        pps_freq = ftemp;
+        if (delta > PPS_MAXWANDER || delta < -PPS_MAXWANDER) {
+                pr_warning("hardpps: PPSWANDER: change=%ld\n", delta);
+                time_status |= STA_PPSWANDER;
+                pps_stbcnt++;
+                pps_dec_freq_interval();
+        } else {        /* good sample */
+                pps_inc_freq_interval();
+        }
+
+        /* the stability metric is calculated as the average of recent
+         * frequency changes, but is used only for performance
+         * monitoring
+         */
+        delta_mod = delta;
+        if (delta_mod < 0)
+                delta_mod = -delta_mod;
+        pps_stabil += (div_s64(((s64)delta_mod) <<
+                                (NTP_SCALE_SHIFT - SHIFT_USEC),
+                                NSEC_PER_USEC) - pps_stabil) >> PPS_INTMIN;
+
+        /* if enabled, the system clock frequency is updated */
+        if ((time_status & STA_PPSFREQ) != 0 &&
+            (time_status & STA_FREQHOLD) == 0) {
+                time_freq = pps_freq;
+                ntp_update_frequency();
+        }
+
+        return delta;
+}
+
+/* correct REALTIME clock phase error against PPS signal */
+static void hardpps_update_phase(long error)
+{
+        long correction = -error;
+        long jitter;
+
+        /* add the sample to the median filter */
+        pps_phase_filter_add(correction);
+        correction = pps_phase_filter_get(&jitter);
+
+        /* Nominal jitter is due to PPS signal noise. If it exceeds the
+         * threshold, the sample is discarded; otherwise, if so enabled,
+         * the time offset is updated.
+         */
+        if (jitter > (pps_jitter << PPS_POPCORN)) {
+                pr_warning("hardpps: PPSJITTER: jitter=%ld, limit=%ld\n",
+                       jitter, (pps_jitter << PPS_POPCORN));
+                time_status |= STA_PPSJITTER;
+                pps_jitcnt++;
+        } else if (time_status & STA_PPSTIME) {
+                /* correct the time using the phase offset */
+                time_offset = div_s64(((s64)correction) << NTP_SCALE_SHIFT,
+                                NTP_INTERVAL_FREQ);
+                /* cancel running adjtime() */
+                time_adjust = 0;
+        }
+        /* update jitter */
+        pps_jitter += (jitter - pps_jitter) >> PPS_INTMIN;
+}
+
+/*
+ * hardpps() - discipline CPU clock oscillator to external PPS signal
+ *
+ * This routine is called at each PPS signal arrival in order to
+ * discipline the CPU clock oscillator to the PPS signal. It takes two
+ * parameters: REALTIME and MONOTONIC_RAW clock timestamps. The former
+ * is used to correct clock phase error and the latter is used to
+ * correct the frequency.
+ *
+ * This code is based on David Mills's reference nanokernel
+ * implementation. It was mostly rewritten but keeps the same idea.
+ */
+void hardpps(const struct timespec *phase_ts, const struct timespec *raw_ts)
+{
+        struct pps_normtime pts_norm, freq_norm;
+        unsigned long flags;
+
+        pts_norm = pps_normalize_ts(*phase_ts);
+
+        write_seqlock_irqsave(&xtime_lock, flags);
+
+        /* clear the error bits, they will be set again if needed */
+        time_status &= ~(STA_PPSJITTER | STA_PPSWANDER | STA_PPSERROR);
+
+        /* indicate signal presence */
+        time_status |= STA_PPSSIGNAL;
+        pps_valid = PPS_VALID;
+
+        /* when called for the first time,
+         * just start the frequency interval */
+        if (unlikely(pps_fbase.tv_sec == 0)) {
+                pps_fbase = *raw_ts;
+                write_sequnlock_irqrestore(&xtime_lock, flags);
+                return;
+        }
+
+        /* ok, now we have a base for frequency calculation */
+        freq_norm = pps_normalize_ts(timespec_sub(*raw_ts, pps_fbase));
+
+        /* check that the signal is in the range
+         * [1s - MAXFREQ us, 1s + MAXFREQ us], otherwise reject it */
+        if ((freq_norm.sec == 0) ||
+                        (freq_norm.nsec > MAXFREQ * freq_norm.sec) ||
+                        (freq_norm.nsec < -MAXFREQ * freq_norm.sec)) {
+                time_status |= STA_PPSJITTER;
+                /* restart the frequency calibration interval */
+                pps_fbase = *raw_ts;
+                write_sequnlock_irqrestore(&xtime_lock, flags);
+                pr_err("hardpps: PPSJITTER: bad pulse\n");
+                return;
+        }
+
+        /* signal is ok */
+
+        /* check if the current frequency interval is finished */
+        if (freq_norm.sec >= (1 << pps_shift)) {
+                pps_calcnt++;
+                /* restart the frequency calibration interval */
+                pps_fbase = *raw_ts;
+                hardpps_update_freq(freq_norm);
+        }
+
+        hardpps_update_phase(pts_norm.nsec);
+
+        write_sequnlock_irqrestore(&xtime_lock, flags);
+}
+EXPORT_SYMBOL(hardpps);
+
+#endif  /* CONFIG_NTP_PPS */
+
 static int __init ntp_tick_adj_setup(char *str)
 {
         ntp_tick_adj = simple_strtol(str, NULL, 0);
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 5bb86da8200..d27c7562902 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -49,7 +49,7 @@ struct timekeeper {
         u32     mult;
 };
 
-struct timekeeper timekeeper;
+static struct timekeeper timekeeper;
 
 /**
  * timekeeper_setup_internals - Set up internals to use clocksource clock.
@@ -164,7 +164,7 @@ static struct timespec total_sleep_time;
 /*
  * The raw monotonic time for the CLOCK_MONOTONIC_RAW posix clock.
  */
-struct timespec raw_time;
+static struct timespec raw_time;
 
 /* flag for if timekeeping is suspended */
 int __read_mostly timekeeping_suspended;
@@ -288,6 +288,49 @@ void ktime_get_ts(struct timespec *ts)
 }
 EXPORT_SYMBOL_GPL(ktime_get_ts);
 
+#ifdef CONFIG_NTP_PPS
+
+/**
+ * getnstime_raw_and_real - get day and raw monotonic time in timespec format
+ * @ts_raw:     pointer to the timespec to be set to raw monotonic time
+ * @ts_real:    pointer to the timespec to be set to the time of day
+ *
+ * This function reads both the time of day and raw monotonic time at the
+ * same time atomically and stores the resulting timestamps in timespec
+ * format.
+ */
+void getnstime_raw_and_real(struct timespec *ts_raw, struct timespec *ts_real)
+{
+        unsigned long seq;
+        s64 nsecs_raw, nsecs_real;
+
+        WARN_ON_ONCE(timekeeping_suspended);
+
+        do {
+                u32 arch_offset;
+
+                seq = read_seqbegin(&xtime_lock);
+
+                *ts_raw = raw_time;
+                *ts_real = xtime;
+
+                nsecs_raw = timekeeping_get_ns_raw();
+                nsecs_real = timekeeping_get_ns();
+
+                /* If arch requires, add in gettimeoffset() */
+                arch_offset = arch_gettimeoffset();
+                nsecs_raw += arch_offset;
+                nsecs_real += arch_offset;
+
+        } while (read_seqretry(&xtime_lock, seq));
+
+        timespec_add_ns(ts_raw, nsecs_raw);
+        timespec_add_ns(ts_real, nsecs_real);
+}
+EXPORT_SYMBOL(getnstime_raw_and_real);
+
+#endif /* CONFIG_NTP_PPS */
+
 /**
  * do_gettimeofday - Returns the time of day in a timeval
  * @tv:         pointer to the timeval to be set
diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile
index 53f338190b2..761c510a06c 100644
--- a/kernel/trace/Makefile
+++ b/kernel/trace/Makefile
@@ -52,7 +52,7 @@ obj-$(CONFIG_EVENT_TRACING) += trace_event_perf.o
 endif
 obj-$(CONFIG_EVENT_TRACING) += trace_events_filter.o
 obj-$(CONFIG_KPROBE_EVENT) += trace_kprobe.o
-obj-$(CONFIG_EVENT_TRACING) += power-traces.o
+obj-$(CONFIG_TRACEPOINTS) += power-traces.o
 ifeq ($(CONFIG_TRACING),y)
 obj-$(CONFIG_KGDB_KDB) += trace_kdb.o
 endif
diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index 7b8ec028154..153562d0b93 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -758,53 +758,58 @@ static void blk_add_trace_rq_complete(void *ignore,
  * @q:          queue the io is for
  * @bio:        the source bio
  * @what:       the action
+ * @error:      error, if any
  *
  * Description:
  *     Records an action against a bio. Will log the bio offset + size.
  *
  **/
 static void blk_add_trace_bio(struct request_queue *q, struct bio *bio,
-                                     u32 what)
+                              u32 what, int error)
 {
         struct blk_trace *bt = q->blk_trace;
 
         if (likely(!bt))
                 return;
 
+        if (!error && !bio_flagged(bio, BIO_UPTODATE))
+                error = EIO;
+
         __blk_add_trace(bt, bio->bi_sector, bio->bi_size, bio->bi_rw, what,
-                        !bio_flagged(bio, BIO_UPTODATE), 0, NULL);
+                        error, 0, NULL);
 }
 
 static void blk_add_trace_bio_bounce(void *ignore,
                                      struct request_queue *q, struct bio *bio)
 {
-        blk_add_trace_bio(q, bio, BLK_TA_BOUNCE);
+        blk_add_trace_bio(q, bio, BLK_TA_BOUNCE, 0);
 }
 
 static void blk_add_trace_bio_complete(void *ignore,
-                                       struct request_queue *q, struct bio *bio)
+                                       struct request_queue *q, struct bio *bio,
+                                       int error)
 {
-        blk_add_trace_bio(q, bio, BLK_TA_COMPLETE);
+        blk_add_trace_bio(q, bio, BLK_TA_COMPLETE, error);
 }
 
 static void blk_add_trace_bio_backmerge(void *ignore,
                                         struct request_queue *q,
                                         struct bio *bio)
 {
-        blk_add_trace_bio(q, bio, BLK_TA_BACKMERGE);
+        blk_add_trace_bio(q, bio, BLK_TA_BACKMERGE, 0);
 }
 
 static void blk_add_trace_bio_frontmerge(void *ignore,
                                          struct request_queue *q,
                                          struct bio *bio)
 {
-        blk_add_trace_bio(q, bio, BLK_TA_FRONTMERGE);
+        blk_add_trace_bio(q, bio, BLK_TA_FRONTMERGE, 0);
 }
 
 static void blk_add_trace_bio_queue(void *ignore,
                                     struct request_queue *q, struct bio *bio)
 {
-        blk_add_trace_bio(q, bio, BLK_TA_QUEUE);
+        blk_add_trace_bio(q, bio, BLK_TA_QUEUE, 0);
 }
 
 static void blk_add_trace_getrq(void *ignore,
@@ -812,7 +817,7 @@ static void blk_add_trace_getrq(void *ignore,
                                 struct bio *bio, int rw)
 {
         if (bio)
-                blk_add_trace_bio(q, bio, BLK_TA_GETRQ);
+                blk_add_trace_bio(q, bio, BLK_TA_GETRQ, 0);
         else {
                 struct blk_trace *bt = q->blk_trace;
 
@@ -827,7 +832,7 @@ static void blk_add_trace_sleeprq(void *ignore,
                                   struct bio *bio, int rw)
 {
         if (bio)
-                blk_add_trace_bio(q, bio, BLK_TA_SLEEPRQ);
+                blk_add_trace_bio(q, bio, BLK_TA_SLEEPRQ, 0);
         else {
                 struct blk_trace *bt = q->blk_trace;
 
@@ -887,7 +892,7 @@ static void blk_add_trace_split(void *ignore,
 }
 
 /**
- * blk_add_trace_remap - Add a trace for a remap operation
+ * blk_add_trace_bio_remap - Add a trace for a bio-remap operation
  * @ignore:     trace callback data parameter (not used)
  * @q:          queue the io is for
  * @bio:        the source bio
@@ -899,9 +904,9 @@ static void blk_add_trace_split(void *ignore,
  *     it spans a stripe (or similar). Add a trace for that action.
  *
  **/
-static void blk_add_trace_remap(void *ignore,
-                                struct request_queue *q, struct bio *bio,
-                                dev_t dev, sector_t from)
+static void blk_add_trace_bio_remap(void *ignore,
+                                    struct request_queue *q, struct bio *bio,
+                                    dev_t dev, sector_t from)
 {
         struct blk_trace *bt = q->blk_trace;
         struct blk_io_trace_remap r;
@@ -1016,7 +1021,7 @@ static void blk_register_tracepoints(void)
         WARN_ON(ret);
         ret = register_trace_block_split(blk_add_trace_split, NULL);
         WARN_ON(ret);
-        ret = register_trace_block_remap(blk_add_trace_remap, NULL);
+        ret = register_trace_block_bio_remap(blk_add_trace_bio_remap, NULL);
         WARN_ON(ret);
         ret = register_trace_block_rq_remap(blk_add_trace_rq_remap, NULL);
         WARN_ON(ret);
@@ -1025,7 +1030,7 @@ static void blk_register_tracepoints(void)
 static void blk_unregister_tracepoints(void)
 {
         unregister_trace_block_rq_remap(blk_add_trace_rq_remap, NULL);
-        unregister_trace_block_remap(blk_add_trace_remap, NULL);
+        unregister_trace_block_bio_remap(blk_add_trace_bio_remap, NULL);
         unregister_trace_block_split(blk_add_trace_split, NULL);
         unregister_trace_block_unplug_io(blk_add_trace_unplug_io, NULL);
         unregister_trace_block_unplug_timer(blk_add_trace_unplug_timer, NULL);
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index f8cf959bad4..dc53ecb8058 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -1313,12 +1313,10 @@ ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags, int pc)
 
         __this_cpu_inc(user_stack_count);
 
-
-
         event = trace_buffer_lock_reserve(buffer, TRACE_USER_STACK,
                                           sizeof(*entry), flags, pc);
         if (!event)
-                return;
+                goto out_drop_count;
         entry   = ring_buffer_event_data(event);
 
         entry->tgid             = current->tgid;
@@ -1333,8 +1331,8 @@ ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags, int pc)
         if (!filter_check_discard(call, entry, buffer, event))
                 ring_buffer_unlock_commit(buffer, event);
 
+ out_drop_count:
         __this_cpu_dec(user_stack_count);
-
  out:
         preempt_enable();
 }
diff --git a/kernel/trace/trace_entries.h b/kernel/trace/trace_entries.h
index e3dfecaf13e..6cf223764be 100644
--- a/kernel/trace/trace_entries.h
+++ b/kernel/trace/trace_entries.h
@@ -53,7 +53,7 @@
  */
 
 /*
- * Function trace entry - function address and parent function addres:
+ * Function trace entry - function address and parent function address:
  */
 FTRACE_ENTRY(function, ftrace_entry,
 
diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
index bac752f0cfb..b706529b4fc 100644
--- a/kernel/trace/trace_syscalls.c
+++ b/kernel/trace/trace_syscalls.c
@@ -23,9 +23,6 @@ static int syscall_exit_register(struct ftrace_event_call *event,
 static int syscall_enter_define_fields(struct ftrace_event_call *call);
 static int syscall_exit_define_fields(struct ftrace_event_call *call);
 
-/* All syscall exit events have the same fields */
-static LIST_HEAD(syscall_exit_fields);
-
 static struct list_head *
 syscall_get_enter_fields(struct ftrace_event_call *call)
 {
@@ -34,34 +31,28 @@ syscall_get_enter_fields(struct ftrace_event_call *call)
         return &entry->enter_fields;
 }
 
-static struct list_head *
-syscall_get_exit_fields(struct ftrace_event_call *call)
-{
-        return &syscall_exit_fields;
-}
-
 struct trace_event_functions enter_syscall_print_funcs = {
-        .trace                  = print_syscall_enter,
+        .trace          = print_syscall_enter,
 };
 
 struct trace_event_functions exit_syscall_print_funcs = {
-        .trace                  = print_syscall_exit,
+        .trace          = print_syscall_exit,
 };
 
 struct ftrace_event_class event_class_syscall_enter = {
-        .system                 = "syscalls",
-        .reg                    = syscall_enter_register,
-        .define_fields          = syscall_enter_define_fields,
-        .get_fields             = syscall_get_enter_fields,
-        .raw_init               = init_syscall_trace,
+        .system         = "syscalls",
+        .reg            = syscall_enter_register,
+        .define_fields  = syscall_enter_define_fields,
+        .get_fields     = syscall_get_enter_fields,
+        .raw_init       = init_syscall_trace,
 };
 
 struct ftrace_event_class event_class_syscall_exit = {
-        .system                 = "syscalls",
-        .reg                    = syscall_exit_register,
-        .define_fields          = syscall_exit_define_fields,
-        .get_fields             = syscall_get_exit_fields,
-        .raw_init               = init_syscall_trace,
+        .system         = "syscalls",
+        .reg            = syscall_exit_register,
+        .define_fields  = syscall_exit_define_fields,
+        .fields         = LIST_HEAD_INIT(event_class_syscall_exit.fields),
+        .raw_init       = init_syscall_trace,
 };
 
 extern unsigned long __start_syscalls_metadata[];
diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c
index 25915832291..9da289c34f2 100644
--- a/kernel/user_namespace.c
+++ b/kernel/user_namespace.c
@@ -12,6 +12,8 @@
 #include <linux/highuid.h>
 #include <linux/cred.h>
 
+static struct kmem_cache *user_ns_cachep __read_mostly;
+
 /*
  * Create a new user namespace, deriving the creator from the user in the
  * passed credentials, and replacing that user with the new root user for the
@@ -26,7 +28,7 @@ int create_user_ns(struct cred *new)
         struct user_struct *root_user;
         int n;
 
-        ns = kmalloc(sizeof(struct user_namespace), GFP_KERNEL);
+        ns = kmem_cache_alloc(user_ns_cachep, GFP_KERNEL);
         if (!ns)
                 return -ENOMEM;
 
@@ -38,7 +40,7 @@ int create_user_ns(struct cred *new)
         /* Alloc new root user.  */
         root_user = alloc_uid(ns, 0);
         if (!root_user) {
-                kfree(ns);
+                kmem_cache_free(user_ns_cachep, ns);
                 return -ENOMEM;
         }
 
@@ -71,7 +73,7 @@ static void free_user_ns_work(struct work_struct *work)
         struct user_namespace *ns =
                 container_of(work, struct user_namespace, destroyer);
         free_uid(ns->creator);
-        kfree(ns);
+        kmem_cache_free(user_ns_cachep, ns);
 }
 
 void free_user_ns(struct kref *kref)
@@ -126,3 +128,10 @@ gid_t user_ns_map_gid(struct user_namespace *to, const struct cred *cred, gid_t
         /* No useful relationship so no mapping */
         return overflowgid;
 }
+
+static __init int user_namespaces_init(void)
+{
+        user_ns_cachep = KMEM_CACHE(user_namespace, SLAB_PANIC);
+        return 0;
+}
+module_init(user_namespaces_init);