30 files changed, 409 insertions, 198 deletions

diff --git a/kernel/Makefile b/kernel/Makefile
index 170a9213c1b6..e4791b3ba55d 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -51,6 +51,7 @@ obj-$(CONFIG_UID16) += uid16.o
 obj-$(CONFIG_MODULES) += module.o
 obj-$(CONFIG_KALLSYMS) += kallsyms.o
 obj-$(CONFIG_PM) += power/
+obj-$(CONFIG_FREEZER) += power/
 obj-$(CONFIG_BSD_PROCESS_ACCT) += acct.o
 obj-$(CONFIG_KEXEC) += kexec.o
 obj-$(CONFIG_BACKTRACE_SELF_TEST) += backtracetest.o
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index e14db9c089b9..9edb5c4b79b4 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -1122,8 +1122,8 @@ static void cgroup_kill_sb(struct super_block *sb) {
 
         mutex_unlock(&cgroup_mutex);
 
-        kfree(root);
         kill_litter_super(sb);
+        kfree(root);
 }
 
 static struct file_system_type cgroup_fs_type = {
diff --git a/kernel/fork.c b/kernel/fork.c
index a66fbde20715..4854c2c4a82e 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1179,10 +1179,6 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 #endif
         clear_all_latency_tracing(p);
 
-        /* Our parent execution domain becomes current domain
-           These must match for thread signalling to apply */
-        p->parent_exec_id = p->self_exec_id;
-
         /* ok, now we should be set up.. */
         p->exit_signal = (clone_flags & CLONE_THREAD) ? -1 : (clone_flags & CSIGNAL);
         p->pdeath_signal = 0;
@@ -1220,10 +1216,13 @@ static struct task_struct *copy_process(unsigned long clone_flags,
                 set_task_cpu(p, smp_processor_id());
 
         /* CLONE_PARENT re-uses the old parent */
-        if (clone_flags & (CLONE_PARENT|CLONE_THREAD))
+        if (clone_flags & (CLONE_PARENT|CLONE_THREAD)) {
                 p->real_parent = current->real_parent;
-        else
+                p->parent_exec_id = current->parent_exec_id;
+        } else {
                 p->real_parent = current;
+                p->parent_exec_id = current->self_exec_id;
+        }
 
         spin_lock(&current->sighand->siglock);
 
diff --git a/kernel/futex.c b/kernel/futex.c
index f89d373a9c6d..438701adce23 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -1165,6 +1165,7 @@ static int futex_wait(u32 __user *uaddr, int fshared,
                       u32 val, ktime_t *abs_time, u32 bitset, int clockrt)
 {
         struct task_struct *curr = current;
+        struct restart_block *restart;
         DECLARE_WAITQUEUE(wait, curr);
         struct futex_hash_bucket *hb;
         struct futex_q q;
@@ -1216,11 +1217,13 @@ retry:
 
                 if (!ret)
                         goto retry;
-                return ret;
+                goto out;
         }
         ret = -EWOULDBLOCK;
-        if (uval != val)
-                goto out_unlock_put_key;
+        if (unlikely(uval != val)) {
+                queue_unlock(&q, hb);
+                goto out_put_key;
+        }
 
         /* Only actually queue if *uaddr contained val.  */
         queue_me(&q, hb);
@@ -1284,38 +1287,38 @@ retry:
          */
 
         /* If we were woken (and unqueued), we succeeded, whatever. */
+        ret = 0;
         if (!unqueue_me(&q))
-                return 0;
+                goto out_put_key;
+        ret = -ETIMEDOUT;
         if (rem)
-                return -ETIMEDOUT;
+                goto out_put_key;
 
         /*
          * We expect signal_pending(current), but another thread may
          * have handled it for us already.
          */
+        ret = -ERESTARTSYS;
         if (!abs_time)
-                return -ERESTARTSYS;
-        else {
-                struct restart_block *restart;
-                restart = &current_thread_info()->restart_block;
-                restart->fn = futex_wait_restart;
-                restart->futex.uaddr = (u32 *)uaddr;
-                restart->futex.val = val;
-                restart->futex.time = abs_time->tv64;
-                restart->futex.bitset = bitset;
-                restart->futex.flags = 0;
-
-                if (fshared)
-                        restart->futex.flags |= FLAGS_SHARED;
-                if (clockrt)
-                        restart->futex.flags |= FLAGS_CLOCKRT;
-                return -ERESTART_RESTARTBLOCK;
-        }
+                goto out_put_key;
 
-out_unlock_put_key:
-        queue_unlock(&q, hb);
-        put_futex_key(fshared, &q.key);
+        restart = &current_thread_info()->restart_block;
+        restart->fn = futex_wait_restart;
+        restart->futex.uaddr = (u32 *)uaddr;
+        restart->futex.val = val;
+        restart->futex.time = abs_time->tv64;
+        restart->futex.bitset = bitset;
+        restart->futex.flags = 0;
+
+        if (fshared)
+                restart->futex.flags |= FLAGS_SHARED;
+        if (clockrt)
+                restart->futex.flags |= FLAGS_CLOCKRT;
 
+        ret = -ERESTART_RESTARTBLOCK;
+
+out_put_key:
+        put_futex_key(fshared, &q.key);
 out:
         return ret;
 }
diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index 759b8b04d294..f6cdda68e5c6 100644
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -338,6 +338,8 @@ irqreturn_t handle_IRQ_event(unsigned int irq, struct irqaction *action)
         irqreturn_t ret, retval = IRQ_NONE;
         unsigned int status = 0;
 
+        WARN_ONCE(!in_irq(), "BUG: IRQ handler called from non-hardirq context!");
+
         if (!(action->flags & IRQF_DISABLED))
                 local_irq_enable_in_hardirq();
 
@@ -357,6 +359,11 @@ irqreturn_t handle_IRQ_event(unsigned int irq, struct irqaction *action)
 }
 
 #ifndef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
+
+#ifdef CONFIG_ENABLE_WARN_DEPRECATED
+# warning __do_IRQ is deprecated. Please convert to proper flow handlers
+#endif
+
 /**
  * __do_IRQ - original all in one highlevel IRQ handler
  * @irq:        the interrupt number
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index cbc3828faf5f..ea119effe096 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -389,9 +389,9 @@ int __irq_set_trigger(struct irq_desc *desc, unsigned int irq,
  * allocate special interrupts that are part of the architecture.
  */
 static int
-__setup_irq(unsigned int irq, struct irq_desc * desc, struct irqaction *new)
+__setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
 {
-        struct irqaction *old, **p;
+        struct irqaction *old, **old_ptr;
         const char *old_name = NULL;
         unsigned long flags;
         int shared = 0;
@@ -423,8 +423,8 @@ __setup_irq(unsigned int irq, struct irq_desc * desc, struct irqaction *new)
          * The following block of code has to be executed atomically
          */
         spin_lock_irqsave(&desc->lock, flags);
-        p = &desc->action;
-        old = *p;
+        old_ptr = &desc->action;
+        old = *old_ptr;
         if (old) {
                 /*
                  * Can't share interrupts unless both agree to and are
@@ -447,8 +447,8 @@ __setup_irq(unsigned int irq, struct irq_desc * desc, struct irqaction *new)
 
                 /* add new interrupt at end of irq queue */
                 do {
-                        p = &old->next;
-                        old = *p;
+                        old_ptr = &old->next;
+                        old = *old_ptr;
                 } while (old);
                 shared = 1;
         }
@@ -499,7 +499,7 @@ __setup_irq(unsigned int irq, struct irq_desc * desc, struct irqaction *new)
                                 (int)(new->flags & IRQF_TRIGGER_MASK));
         }
 
-        *p = new;
+        *old_ptr = new;
 
         /* Reset broken irq detection when installing new handler */
         desc->irq_count = 0;
@@ -549,90 +549,117 @@ int setup_irq(unsigned int irq, struct irqaction *act)
 
         return __setup_irq(irq, desc, act);
 }
+EXPORT_SYMBOL_GPL(setup_irq);
 
-/**
- *      free_irq - free an interrupt
- *      @irq: Interrupt line to free
- *      @dev_id: Device identity to free
- *
- *      Remove an interrupt handler. The handler is removed and if the
- *      interrupt line is no longer in use by any driver it is disabled.
- *      On a shared IRQ the caller must ensure the interrupt is disabled
- *      on the card it drives before calling this function. The function
- *      does not return until any executing interrupts for this IRQ
- *      have completed.
- *
- *      This function must not be called from interrupt context.
+ /*
+ * Internal function to unregister an irqaction - used to free
+ * regular and special interrupts that are part of the architecture.
  */
-void free_irq(unsigned int irq, void *dev_id)
+static struct irqaction *__free_irq(unsigned int irq, void *dev_id)
 {
         struct irq_desc *desc = irq_to_desc(irq);
-        struct irqaction **p;
+        struct irqaction *action, **action_ptr;
         unsigned long flags;
 
-        WARN_ON(in_interrupt());
+        WARN(in_interrupt(), "Trying to free IRQ %d from IRQ context!\n", irq);
 
         if (!desc)
-                return;
+                return NULL;
 
         spin_lock_irqsave(&desc->lock, flags);
-        p = &desc->action;
+
+        /*
+         * There can be multiple actions per IRQ descriptor, find the right
+         * one based on the dev_id:
+         */
+        action_ptr = &desc->action;
         for (;;) {
-                struct irqaction *action = *p;
+                action = *action_ptr;
 
-                if (action) {
-                        struct irqaction **pp = p;
+                if (!action) {
+                        WARN(1, "Trying to free already-free IRQ %d\n", irq);
+                        spin_unlock_irqrestore(&desc->lock, flags);
 
-                        p = &action->next;
-                        if (action->dev_id != dev_id)
-                                continue;
+                        return NULL;
+                }
 
-                        /* Found it - now remove it from the list of entries */
-                        *pp = action->next;
+                if (action->dev_id == dev_id)
+                        break;
+                action_ptr = &action->next;
+        }
 
-                        /* Currently used only by UML, might disappear one day.*/
+        /* Found it - now remove it from the list of entries: */
+        *action_ptr = action->next;
+
+        /* Currently used only by UML, might disappear one day: */
 #ifdef CONFIG_IRQ_RELEASE_METHOD
-                        if (desc->chip->release)
-                                desc->chip->release(irq, dev_id);
+        if (desc->chip->release)
+                desc->chip->release(irq, dev_id);
 #endif
 
-                        if (!desc->action) {
-                                desc->status |= IRQ_DISABLED;
-                                if (desc->chip->shutdown)
-                                        desc->chip->shutdown(irq);
-                                else
-                                        desc->chip->disable(irq);
-                        }
-                        spin_unlock_irqrestore(&desc->lock, flags);
-                        unregister_handler_proc(irq, action);
+        /* If this was the last handler, shut down the IRQ line: */
+        if (!desc->action) {
+                desc->status |= IRQ_DISABLED;
+                if (desc->chip->shutdown)
+                        desc->chip->shutdown(irq);
+                else
+                        desc->chip->disable(irq);
+        }
+        spin_unlock_irqrestore(&desc->lock, flags);
+
+        unregister_handler_proc(irq, action);
+
+        /* Make sure it's not being used on another CPU: */
+        synchronize_irq(irq);
 
-                        /* Make sure it's not being used on another CPU */
-                        synchronize_irq(irq);
-#ifdef CONFIG_DEBUG_SHIRQ
-                        /*
-                         * It's a shared IRQ -- the driver ought to be
-                         * prepared for it to happen even now it's
-                         * being freed, so let's make sure....  We do
-                         * this after actually deregistering it, to
-                         * make sure that a 'real' IRQ doesn't run in
-                         * parallel with our fake
-                         */
-                        if (action->flags & IRQF_SHARED) {
-                                local_irq_save(flags);
-                                action->handler(irq, dev_id);
-                                local_irq_restore(flags);
-                        }
-#endif
-                        kfree(action);
-                        return;
-                }
-                printk(KERN_ERR "Trying to free already-free IRQ %d\n", irq);
 #ifdef CONFIG_DEBUG_SHIRQ
-                dump_stack();
-#endif
-                spin_unlock_irqrestore(&desc->lock, flags);
-                return;
+        /*
+         * It's a shared IRQ -- the driver ought to be prepared for an IRQ
+         * event to happen even now it's being freed, so let's make sure that
+         * is so by doing an extra call to the handler ....
+         *
+         * ( We do this after actually deregistering it, to make sure that a
+         *   'real' IRQ doesn't run in * parallel with our fake. )
+         */
+        if (action->flags & IRQF_SHARED) {
+                local_irq_save(flags);
+                action->handler(irq, dev_id);
+                local_irq_restore(flags);
         }
+#endif
+        return action;
+}
+
+/**
+ *      remove_irq - free an interrupt
+ *      @irq: Interrupt line to free
+ *      @act: irqaction for the interrupt
+ *
+ * Used to remove interrupts statically setup by the early boot process.
+ */
+void remove_irq(unsigned int irq, struct irqaction *act)
+{
+        __free_irq(irq, act->dev_id);
+}
+EXPORT_SYMBOL_GPL(remove_irq);
+
+/**
+ *      free_irq - free an interrupt allocated with request_irq
+ *      @irq: Interrupt line to free
+ *      @dev_id: Device identity to free
+ *
+ *      Remove an interrupt handler. The handler is removed and if the
+ *      interrupt line is no longer in use by any driver it is disabled.
+ *      On a shared IRQ the caller must ensure the interrupt is disabled
+ *      on the card it drives before calling this function. The function
+ *      does not return until any executing interrupts for this IRQ
+ *      have completed.
+ *
+ *      This function must not be called from interrupt context.
+ */
+void free_irq(unsigned int irq, void *dev_id)
+{
+        kfree(__free_irq(irq, dev_id));
 }
 EXPORT_SYMBOL(free_irq);
 
@@ -679,11 +706,12 @@ int request_irq(unsigned int irq, irq_handler_t handler,
          * the behavior is classified as "will not fix" so we need to
          * start nudging drivers away from using that idiom.
          */
-        if ((irqflags & (IRQF_SHARED|IRQF_DISABLED))
-                        == (IRQF_SHARED|IRQF_DISABLED))
-                pr_warning("IRQ %d/%s: IRQF_DISABLED is not "
-                                "guaranteed on shared IRQs\n",
-                                irq, devname);
+        if ((irqflags & (IRQF_SHARED|IRQF_DISABLED)) ==
+                                        (IRQF_SHARED|IRQF_DISABLED)) {
+                pr_warning(
+                  "IRQ %d/%s: IRQF_DISABLED is not guaranteed on shared IRQs\n",
+                        irq, devname);
+        }
 
 #ifdef CONFIG_LOCKDEP
         /*
@@ -709,15 +737,13 @@ int request_irq(unsigned int irq, irq_handler_t handler,
         if (!handler)
                 return -EINVAL;
 
-        action = kmalloc(sizeof(struct irqaction), GFP_KERNEL);
+        action = kzalloc(sizeof(struct irqaction), GFP_KERNEL);
         if (!action)
                 return -ENOMEM;
 
         action->handler = handler;
         action->flags = irqflags;
-        cpus_clear(action->mask);
         action->name = devname;
-        action->next = NULL;
         action->dev_id = dev_id;
 
         retval = __setup_irq(irq, desc, action);
diff --git a/kernel/kexec.c b/kernel/kexec.c
index 8a6d7b08864e..483899578259 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -1465,6 +1465,11 @@ int kernel_kexec(void)
                 error = device_power_down(PMSG_FREEZE);
                 if (error)
                         goto Enable_irqs;
+
+                /* Suspend system devices */
+                error = sysdev_suspend(PMSG_FREEZE);
+                if (error)
+                        goto Power_up_devices;
         } else
 #endif
         {
@@ -1477,6 +1482,8 @@ int kernel_kexec(void)
 
 #ifdef CONFIG_KEXEC_JUMP
         if (kexec_image->preserve_context) {
+                sysdev_resume();
+ Power_up_devices:
                 device_power_up(PMSG_RESTORE);
  Enable_irqs:
                 local_irq_enable();
diff --git a/kernel/posix-cpu-timers.c b/kernel/posix-cpu-timers.c
index 2313a4cc14ea..e976e505648d 100644
--- a/kernel/posix-cpu-timers.c
+++ b/kernel/posix-cpu-timers.c
@@ -681,6 +681,33 @@ static void cpu_timer_fire(struct k_itimer *timer)
 }
 
 /*
+ * Sample a process (thread group) timer for the given group_leader task.
+ * Must be called with tasklist_lock held for reading.
+ */
+static int cpu_timer_sample_group(const clockid_t which_clock,
+                                  struct task_struct *p,
+                                  union cpu_time_count *cpu)
+{
+        struct task_cputime cputime;
+
+        thread_group_cputimer(p, &cputime);
+        switch (CPUCLOCK_WHICH(which_clock)) {
+        default:
+                return -EINVAL;
+        case CPUCLOCK_PROF:
+                cpu->cpu = cputime_add(cputime.utime, cputime.stime);
+                break;
+        case CPUCLOCK_VIRT:
+                cpu->cpu = cputime.utime;
+                break;
+        case CPUCLOCK_SCHED:
+                cpu->sched = cputime.sum_exec_runtime + task_delta_exec(p);
+                break;
+        }
+        return 0;
+}
+
+/*
  * Guts of sys_timer_settime for CPU timers.
  * This is called with the timer locked and interrupts disabled.
  * If we return TIMER_RETRY, it's necessary to release the timer's lock
@@ -741,7 +768,7 @@ int posix_cpu_timer_set(struct k_itimer *timer, int flags,
         if (CPUCLOCK_PERTHREAD(timer->it_clock)) {
                 cpu_clock_sample(timer->it_clock, p, &val);
         } else {
-                cpu_clock_sample_group(timer->it_clock, p, &val);
+                cpu_timer_sample_group(timer->it_clock, p, &val);
         }
 
         if (old) {
@@ -889,7 +916,7 @@ void posix_cpu_timer_get(struct k_itimer *timer, struct itimerspec *itp)
                         read_unlock(&tasklist_lock);
                         goto dead;
                 } else {
-                        cpu_clock_sample_group(timer->it_clock, p, &now);
+                        cpu_timer_sample_group(timer->it_clock, p, &now);
                         clear_dead = (unlikely(p->exit_state) &&
                                       thread_group_empty(p));
                 }
@@ -1244,7 +1271,7 @@ void posix_cpu_timer_schedule(struct k_itimer *timer)
                         clear_dead_task(timer, now);
                         goto out_unlock;
                 }
-                cpu_clock_sample_group(timer->it_clock, p, &now);
+                cpu_timer_sample_group(timer->it_clock, p, &now);
                 bump_cpu_timer(timer, now);
                 /* Leave the tasklist_lock locked for the call below.  */
         }
@@ -1409,33 +1436,6 @@ void run_posix_cpu_timers(struct task_struct *tsk)
 }
 
 /*
- * Sample a process (thread group) timer for the given group_leader task.
- * Must be called with tasklist_lock held for reading.
- */
-static int cpu_timer_sample_group(const clockid_t which_clock,
-                                  struct task_struct *p,
-                                  union cpu_time_count *cpu)
-{
-        struct task_cputime cputime;
-
-        thread_group_cputimer(p, &cputime);
-        switch (CPUCLOCK_WHICH(which_clock)) {
-        default:
-                return -EINVAL;
-        case CPUCLOCK_PROF:
-                cpu->cpu = cputime_add(cputime.utime, cputime.stime);
-                break;
-        case CPUCLOCK_VIRT:
-                cpu->cpu = cputime.utime;
-                break;
-        case CPUCLOCK_SCHED:
-                cpu->sched = cputime.sum_exec_runtime + task_delta_exec(p);
-                break;
-        }
-        return 0;
-}
-
-/*
  * Set one of the process-wide special case CPU timers.
  * The tsk->sighand->siglock must be held by the caller.
  * The *newval argument is relative and we update it to be absolute, *oldval
diff --git a/kernel/power/Makefile b/kernel/power/Makefile
index d7a10167a25b..720ea4f781bd 100644
--- a/kernel/power/Makefile
+++ b/kernel/power/Makefile
@@ -3,7 +3,7 @@ ifeq ($(CONFIG_PM_DEBUG),y)
 EXTRA_CFLAGS    +=      -DDEBUG
 endif
 
-obj-y                           := main.o
+obj-$(CONFIG_PM)                += main.o
 obj-$(CONFIG_PM_SLEEP)          += console.o
 obj-$(CONFIG_FREEZER)           += process.o
 obj-$(CONFIG_HIBERNATION)       += swsusp.o disk.o snapshot.o swap.o user.o
diff --git a/kernel/power/console.c b/kernel/power/console.c
index b8628be2a465..a3961b205de7 100644
--- a/kernel/power/console.c
+++ b/kernel/power/console.c
@@ -78,6 +78,12 @@ void pm_restore_console(void)
         }
         set_console(orig_fgconsole);
         release_console_sem();
+
+        if (vt_waitactive(orig_fgconsole)) {
+                pr_debug("Resume: Can't switch VCs.");
+                return;
+        }
+
         kmsg_redirect = orig_kmsg;
 }
 #endif
diff --git a/kernel/power/disk.c b/kernel/power/disk.c
index 432ee575c9ee..4a4a206b1979 100644
--- a/kernel/power/disk.c
+++ b/kernel/power/disk.c
@@ -227,6 +227,12 @@ static int create_image(int platform_mode)
                         "aborting hibernation\n");
                 goto Enable_irqs;
         }
+        sysdev_suspend(PMSG_FREEZE);
+        if (error) {
+                printk(KERN_ERR "PM: Some devices failed to power down, "
+                        "aborting hibernation\n");
+                goto Power_up_devices;
+        }
 
         if (hibernation_test(TEST_CORE))
                 goto Power_up;
@@ -242,9 +248,11 @@ static int create_image(int platform_mode)
         if (!in_suspend)
                 platform_leave(platform_mode);
  Power_up:
+        sysdev_resume();
         /* NOTE:  device_power_up() is just a resume() for devices
          * that suspended with irqs off ... no overall powerup.
          */
+ Power_up_devices:
         device_power_up(in_suspend ?
                 (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
  Enable_irqs:
@@ -335,6 +343,7 @@ static int resume_target_kernel(void)
                         "aborting resume\n");
                 goto Enable_irqs;
         }
+        sysdev_suspend(PMSG_QUIESCE);
         /* We'll ignore saved state, but this gets preempt count (etc) right */
         save_processor_state();
         error = restore_highmem();
@@ -357,6 +366,7 @@ static int resume_target_kernel(void)
         swsusp_free();
         restore_processor_state();
         touch_softlockup_watchdog();
+        sysdev_resume();
         device_power_up(PMSG_RECOVER);
  Enable_irqs:
         local_irq_enable();
@@ -440,6 +450,7 @@ int hibernation_platform_enter(void)
         local_irq_disable();
         error = device_power_down(PMSG_HIBERNATE);
         if (!error) {
+                sysdev_suspend(PMSG_HIBERNATE);
                 hibernation_ops->enter();
                 /* We should never get here */
                 while (1);
@@ -595,6 +606,12 @@ static int software_resume(void)
         unsigned int flags;
 
         /*
+         * If the user said "noresume".. bail out early.
+         */
+        if (noresume)
+                return 0;
+
+        /*
          * name_to_dev_t() below takes a sysfs buffer mutex when sysfs
          * is configured into the kernel. Since the regular hibernate
          * trigger path is via sysfs which takes a buffer mutex before
@@ -610,6 +627,11 @@ static int software_resume(void)
                         mutex_unlock(&pm_mutex);
                         return -ENOENT;
                 }
+                /*
+                 * Some device discovery might still be in progress; we need
+                 * to wait for this to finish.
+                 */
+                wait_for_device_probe();
                 swsusp_resume_device = name_to_dev_t(resume_file);
                 pr_debug("PM: Resume from partition %s\n", resume_file);
         } else {
diff --git a/kernel/power/main.c b/kernel/power/main.c
index b4d219016b6c..c9632f841f64 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -298,8 +298,12 @@ static int suspend_enter(suspend_state_t state)
                 goto Done;
         }
 
-        if (!suspend_test(TEST_CORE))
-                error = suspend_ops->enter(state);
+        error = sysdev_suspend(PMSG_SUSPEND);
+        if (!error) {
+                if (!suspend_test(TEST_CORE))
+                        error = suspend_ops->enter(state);
+                sysdev_resume();
+        }
 
         device_power_up(PMSG_RESUME);
  Done:
diff --git a/kernel/power/swap.c b/kernel/power/swap.c
index 6da14358537c..505f319e489c 100644
--- a/kernel/power/swap.c
+++ b/kernel/power/swap.c
@@ -60,6 +60,7 @@ static struct block_device *resume_bdev;
 static int submit(int rw, pgoff_t page_off, struct page *page,
                         struct bio **bio_chain)
 {
+        const int bio_rw = rw | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG);
         struct bio *bio;
 
         bio = bio_alloc(__GFP_WAIT | __GFP_HIGH, 1);
@@ -80,7 +81,7 @@ static int submit(int rw, pgoff_t page_off, struct page *page,
         bio_get(bio);
 
         if (bio_chain == NULL) {
-                submit_bio(rw | (1 << BIO_RW_SYNC), bio);
+                submit_bio(bio_rw, bio);
                 wait_on_page_locked(page);
                 if (rw == READ)
                         bio_set_pages_dirty(bio);
@@ -90,7 +91,7 @@ static int submit(int rw, pgoff_t page_off, struct page *page,
                         get_page(page); /* These pages are freed later */
                 bio->bi_private = *bio_chain;
                 *bio_chain = bio;
-                submit_bio(rw | (1 << BIO_RW_SYNC), bio);
+                submit_bio(bio_rw, bio);
         }
         return 0;
 }
diff --git a/kernel/power/user.c b/kernel/power/user.c
index 005b93d839ba..6c85359364f2 100644
--- a/kernel/power/user.c
+++ b/kernel/power/user.c
@@ -95,15 +95,15 @@ static int snapshot_open(struct inode *inode, struct file *filp)
                 data->swap = swsusp_resume_device ?
                         swap_type_of(swsusp_resume_device, 0, NULL) : -1;
                 data->mode = O_RDONLY;
-                error = pm_notifier_call_chain(PM_RESTORE_PREPARE);
+                error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE);
                 if (error)
-                        pm_notifier_call_chain(PM_POST_RESTORE);
+                        pm_notifier_call_chain(PM_POST_HIBERNATION);
         } else {
                 data->swap = -1;
                 data->mode = O_WRONLY;
-                error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE);
+                error = pm_notifier_call_chain(PM_RESTORE_PREPARE);
                 if (error)
-                        pm_notifier_call_chain(PM_POST_HIBERNATION);
+                        pm_notifier_call_chain(PM_POST_RESTORE);
         }
         if (error)
                 atomic_inc(&snapshot_device_available);
diff --git a/kernel/printk.c b/kernel/printk.c
index 69188f226a93..e3602d0755b0 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -73,7 +73,6 @@ EXPORT_SYMBOL(oops_in_progress);
  * driver system.
  */
 static DECLARE_MUTEX(console_sem);
-static DECLARE_MUTEX(secondary_console_sem);
 struct console *console_drivers;
 EXPORT_SYMBOL_GPL(console_drivers);
 
@@ -891,12 +890,14 @@ void suspend_console(void)
         printk("Suspending console(s) (use no_console_suspend to debug)\n");
         acquire_console_sem();
         console_suspended = 1;
+        up(&console_sem);
 }
 
 void resume_console(void)
 {
         if (!console_suspend_enabled)
                 return;
+        down(&console_sem);
         console_suspended = 0;
         release_console_sem();
 }
@@ -912,11 +913,9 @@ void resume_console(void)
 void acquire_console_sem(void)
 {
         BUG_ON(in_interrupt());
-        if (console_suspended) {
-                down(&secondary_console_sem);
-                return;
-        }
         down(&console_sem);
+        if (console_suspended)
+                return;
         console_locked = 1;
         console_may_schedule = 1;
 }
@@ -926,6 +925,10 @@ int try_acquire_console_sem(void)
 {
         if (down_trylock(&console_sem))
                 return -1;
+        if (console_suspended) {
+                up(&console_sem);
+                return -1;
+        }
         console_locked = 1;
         console_may_schedule = 0;
         return 0;
@@ -979,7 +982,7 @@ void release_console_sem(void)
         unsigned wake_klogd = 0;
 
         if (console_suspended) {
-                up(&secondary_console_sem);
+                up(&console_sem);
                 return;
         }
 
diff --git a/kernel/rcuclassic.c b/kernel/rcuclassic.c
index bd5a9003497c..654c640a6b9c 100644
--- a/kernel/rcuclassic.c
+++ b/kernel/rcuclassic.c
@@ -679,8 +679,8 @@ int rcu_needs_cpu(int cpu)
 void rcu_check_callbacks(int cpu, int user)
 {
         if (user ||
-            (idle_cpu(cpu) && !in_softirq() &&
-                                hardirq_count() <= (1 << HARDIRQ_SHIFT))) {
+            (idle_cpu(cpu) && rcu_scheduler_active &&
+             !in_softirq() && hardirq_count() <= (1 << HARDIRQ_SHIFT))) {
 
                 /*
                  * Get here if this CPU took its interrupt from user
diff --git a/kernel/rcupdate.c b/kernel/rcupdate.c
index d92a76a881aa..cae8a059cf47 100644
--- a/kernel/rcupdate.c
+++ b/kernel/rcupdate.c
@@ -44,6 +44,7 @@
 #include <linux/cpu.h>
 #include <linux/mutex.h>
 #include <linux/module.h>
+#include <linux/kernel_stat.h>
 
 enum rcu_barrier {
         RCU_BARRIER_STD,
@@ -55,6 +56,7 @@ static DEFINE_PER_CPU(struct rcu_head, rcu_barrier_head) = {NULL};
 static atomic_t rcu_barrier_cpu_count;
 static DEFINE_MUTEX(rcu_barrier_mutex);
 static struct completion rcu_barrier_completion;
+int rcu_scheduler_active __read_mostly;
 
 /*
  * Awaken the corresponding synchronize_rcu() instance now that a
@@ -80,6 +82,10 @@ void wakeme_after_rcu(struct rcu_head  *head)
 void synchronize_rcu(void)
 {
         struct rcu_synchronize rcu;
+
+        if (rcu_blocking_is_gp())
+                return;
+
         init_completion(&rcu.completion);
         /* Will wake me after RCU finished. */
         call_rcu(&rcu.head, wakeme_after_rcu);
@@ -175,3 +181,9 @@ void __init rcu_init(void)
         __rcu_init();
 }
 
+void rcu_scheduler_starting(void)
+{
+        WARN_ON(num_online_cpus() != 1);
+        WARN_ON(nr_context_switches() > 0);
+        rcu_scheduler_active = 1;
+}
diff --git a/kernel/rcupreempt.c b/kernel/rcupreempt.c
index 33cfc50781f9..5d59e850fb71 100644
--- a/kernel/rcupreempt.c
+++ b/kernel/rcupreempt.c
@@ -1181,6 +1181,9 @@ void __synchronize_sched(void)
 {
         struct rcu_synchronize rcu;
 
+        if (num_online_cpus() == 1)
+                return;  /* blocking is gp if only one CPU! */
+
         init_completion(&rcu.completion);
         /* Will wake me after RCU finished. */
         call_rcu_sched(&rcu.head, wakeme_after_rcu);
diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index b2fd602a6f6f..97ce31579ec0 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -948,8 +948,8 @@ static void rcu_do_batch(struct rcu_data *rdp)
 void rcu_check_callbacks(int cpu, int user)
 {
         if (user ||
-            (idle_cpu(cpu) && !in_softirq() &&
-                                hardirq_count() <= (1 << HARDIRQ_SHIFT))) {
+            (idle_cpu(cpu) && rcu_scheduler_active &&
+             !in_softirq() && hardirq_count() <= (1 << HARDIRQ_SHIFT))) {
 
                 /*
                  * Get here if this CPU took its interrupt from user
diff --git a/kernel/sched.c b/kernel/sched.c
index c1d0ed360088..8e2558c2ba67 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -223,7 +223,7 @@ static void start_rt_bandwidth(struct rt_bandwidth *rt_b)
 {
         ktime_t now;
 
-        if (rt_bandwidth_enabled() && rt_b->rt_runtime == RUNTIME_INF)
+        if (!rt_bandwidth_enabled() || rt_b->rt_runtime == RUNTIME_INF)
                 return;
 
         if (hrtimer_active(&rt_b->rt_period_timer))
@@ -6944,20 +6944,26 @@ static void free_rootdomain(struct root_domain *rd)
 
 static void rq_attach_root(struct rq *rq, struct root_domain *rd)
 {
+        struct root_domain *old_rd = NULL;
         unsigned long flags;
 
         spin_lock_irqsave(&rq->lock, flags);
 
         if (rq->rd) {
-                struct root_domain *old_rd = rq->rd;
+                old_rd = rq->rd;
 
                 if (cpumask_test_cpu(rq->cpu, old_rd->online))
                         set_rq_offline(rq);
 
                 cpumask_clear_cpu(rq->cpu, old_rd->span);
 
-                if (atomic_dec_and_test(&old_rd->refcount))
-                        free_rootdomain(old_rd);
+                /*
+                 * If we dont want to free the old_rt yet then
+                 * set old_rd to NULL to skip the freeing later
+                 * in this function:
+                 */
+                if (!atomic_dec_and_test(&old_rd->refcount))
+                        old_rd = NULL;
         }
 
         atomic_inc(&rd->refcount);
@@ -6968,6 +6974,9 @@ static void rq_attach_root(struct rq *rq, struct root_domain *rd)
                 set_rq_online(rq);
 
         spin_unlock_irqrestore(&rq->lock, flags);
+
+        if (old_rd)
+                free_rootdomain(old_rd);
 }
 
 static int __init_refok init_rootdomain(struct root_domain *rd, bool bootmem)
@@ -9215,6 +9224,16 @@ static int sched_rt_global_constraints(void)
 
         return ret;
 }
+
+int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk)
+{
+        /* Don't accept realtime tasks when there is no way for them to run */
+        if (rt_task(tsk) && tg->rt_bandwidth.rt_runtime == 0)
+                return 0;
+
+        return 1;
+}
+
 #else /* !CONFIG_RT_GROUP_SCHED */
 static int sched_rt_global_constraints(void)
 {
@@ -9308,8 +9327,7 @@ cpu_cgroup_can_attach(struct cgroup_subsys *ss, struct cgroup *cgrp,
                       struct task_struct *tsk)
 {
 #ifdef CONFIG_RT_GROUP_SCHED
-        /* Don't accept realtime tasks when there is no way for them to run */
-        if (rt_task(tsk) && cgroup_tg(cgrp)->rt_bandwidth.rt_runtime == 0)
+        if (!sched_rt_can_attach(cgroup_tg(cgrp), tsk))
                 return -EINVAL;
 #else
         /* We don't support RT-tasks being in separate groups */
diff --git a/kernel/seccomp.c b/kernel/seccomp.c
index ad64fcb731f2..57d4b13b631d 100644
--- a/kernel/seccomp.c
+++ b/kernel/seccomp.c
@@ -8,6 +8,7 @@
 
 #include <linux/seccomp.h>
 #include <linux/sched.h>
+#include <linux/compat.h>
 
 /* #define SECCOMP_DEBUG 1 */
 #define NR_SECCOMP_MODES 1
@@ -22,7 +23,7 @@ static int mode1_syscalls[] = {
         0, /* null terminated */
 };
 
-#ifdef TIF_32BIT
+#ifdef CONFIG_COMPAT
 static int mode1_syscalls_32[] = {
         __NR_seccomp_read_32, __NR_seccomp_write_32, __NR_seccomp_exit_32, __NR_seccomp_sigreturn_32,
         0, /* null terminated */
@@ -37,8 +38,8 @@ void __secure_computing(int this_syscall)
         switch (mode) {
         case 1:
                 syscall = mode1_syscalls;
-#ifdef TIF_32BIT
-                if (test_thread_flag(TIF_32BIT))
+#ifdef CONFIG_COMPAT
+                if (is_compat_task())
                         syscall = mode1_syscalls_32;
 #endif
                 do {
diff --git a/kernel/softirq.c b/kernel/softirq.c
index bdbe9de9cd8d..9041ea7948fe 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -626,6 +626,7 @@ static int ksoftirqd(void * __bind_cpu)
                         preempt_enable_no_resched();
                         cond_resched();
                         preempt_disable();
+                        rcu_qsctr_inc((long)__bind_cpu);
                 }
                 preempt_enable();
                 set_current_state(TASK_INTERRUPTIBLE);
diff --git a/kernel/sys.c b/kernel/sys.c
index f145c415bc16..37f458e6882a 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -559,7 +559,7 @@ error:
         abort_creds(new);
         return retval;
 }
-  
+
 /*
  * change the user struct in a credentials set to match the new UID
  */
@@ -571,6 +571,11 @@ static int set_user(struct cred *new)
         if (!new_user)
                 return -EAGAIN;
 
+        if (!task_can_switch_user(new_user, current)) {
+                free_uid(new_user);
+                return -EINVAL;
+        }
+
         if (atomic_read(&new_user->processes) >=
                                 current->signal->rlim[RLIMIT_NPROC].rlim_cur &&
                         new_user != INIT_USER) {
@@ -631,10 +636,11 @@ SYSCALL_DEFINE2(setreuid, uid_t, ruid, uid_t, euid)
                         goto error;
         }
 
-        retval = -EAGAIN;
-        if (new->uid != old->uid && set_user(new) < 0)
-                goto error;
-
+        if (new->uid != old->uid) {
+                retval = set_user(new);
+                if (retval < 0)
+                        goto error;
+        }
         if (ruid != (uid_t) -1 ||
             (euid != (uid_t) -1 && euid != old->uid))
                 new->suid = new->euid;
@@ -680,9 +686,10 @@ SYSCALL_DEFINE1(setuid, uid_t, uid)
         retval = -EPERM;
         if (capable(CAP_SETUID)) {
                 new->suid = new->uid = uid;
-                if (uid != old->uid && set_user(new) < 0) {
-                        retval = -EAGAIN;
-                        goto error;
+                if (uid != old->uid) {
+                        retval = set_user(new);
+                        if (retval < 0)
+                                goto error;
                 }
         } else if (uid != old->uid && uid != new->suid) {
                 goto error;
@@ -734,11 +741,13 @@ SYSCALL_DEFINE3(setresuid, uid_t, ruid, uid_t, euid, uid_t, suid)
                         goto error;
         }
 
-        retval = -EAGAIN;
         if (ruid != (uid_t) -1) {
                 new->uid = ruid;
-                if (ruid != old->uid && set_user(new) < 0)
-                        goto error;
+                if (ruid != old->uid) {
+                        retval = set_user(new);
+                        if (retval < 0)
+                                goto error;
+                }
         }
         if (euid != (uid_t) -1)
                 new->euid = euid;
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index e2a4ff6fc3a6..34e707e5ab87 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -52,6 +52,7 @@ config FUNCTION_TRACER
         depends on HAVE_FUNCTION_TRACER
         depends on DEBUG_KERNEL
         select FRAME_POINTER
+        select KALLSYMS
         select TRACING
         select CONTEXT_SWITCH_TRACER
         help
@@ -238,6 +239,7 @@ config STACK_TRACER
         depends on DEBUG_KERNEL
         select FUNCTION_TRACER
         select STACKTRACE
+        select KALLSYMS
         help
           This special tracer records the maximum stack footprint of the
           kernel and displays it in debugfs/tracing/stack_trace.
@@ -302,4 +304,27 @@ config FTRACE_STARTUP_TEST
           functioning properly. It will do tests on all the configured
           tracers of ftrace.
 
+config MMIOTRACE
+        bool "Memory mapped IO tracing"
+        depends on HAVE_MMIOTRACE_SUPPORT && DEBUG_KERNEL && PCI
+        select TRACING
+        help
+          Mmiotrace traces Memory Mapped I/O access and is meant for
+          debugging and reverse engineering. It is called from the ioremap
+          implementation and works via page faults. Tracing is disabled by
+          default and can be enabled at run-time.
+
+          See Documentation/tracers/mmiotrace.txt.
+          If you are not helping to develop drivers, say N.
+
+config MMIOTRACE_TEST
+        tristate "Test module for mmiotrace"
+        depends on MMIOTRACE && m
+        help
+          This is a dumb module for testing mmiotrace. It is very dangerous
+          as it will write garbage to IO memory starting at a given address.
+          However, it should be safe to use on e.g. unused portion of VRAM.
+
+          Say N, unless you absolutely know what you are doing.
+
 endmenu
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 9a236ffe2aa4..fdf913dfc7e8 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -2033,7 +2033,7 @@ free:
 static int start_graph_tracing(void)
 {
         struct ftrace_ret_stack **ret_stack_list;
-        int ret;
+        int ret, cpu;
 
         ret_stack_list = kmalloc(FTRACE_RETSTACK_ALLOC_SIZE *
                                 sizeof(struct ftrace_ret_stack *),
@@ -2042,6 +2042,10 @@ static int start_graph_tracing(void)
         if (!ret_stack_list)
                 return -ENOMEM;
 
+        /* The cpu_boot init_task->ret_stack will never be freed */
+        for_each_online_cpu(cpu)
+                ftrace_graph_init_task(idle_task(cpu));
+
         do {
                 ret = alloc_retstack_tasklist(ret_stack_list);
         } while (ret == -EAGAIN);
diff --git a/kernel/trace/trace_mmiotrace.c b/kernel/trace/trace_mmiotrace.c
index fffcb069f1dc..80e503ef6136 100644
--- a/kernel/trace/trace_mmiotrace.c
+++ b/kernel/trace/trace_mmiotrace.c
@@ -9,6 +9,7 @@
 #include <linux/kernel.h>
 #include <linux/mmiotrace.h>
 #include <linux/pci.h>
+#include <asm/atomic.h>
 
 #include "trace.h"
 
@@ -19,6 +20,7 @@ struct header_iter {
 static struct trace_array *mmio_trace_array;
 static bool overrun_detected;
 static unsigned long prev_overruns;
+static atomic_t dropped_count;
 
 static void mmio_reset_data(struct trace_array *tr)
 {
@@ -121,11 +123,11 @@ static void mmio_close(struct trace_iterator *iter)
 
 static unsigned long count_overruns(struct trace_iterator *iter)
 {
-        unsigned long cnt = 0;
+        unsigned long cnt = atomic_xchg(&dropped_count, 0);
         unsigned long over = ring_buffer_overruns(iter->tr->buffer);
 
         if (over > prev_overruns)
-                cnt = over - prev_overruns;
+                cnt += over - prev_overruns;
         prev_overruns = over;
         return cnt;
 }
@@ -310,8 +312,10 @@ static void __trace_mmiotrace_rw(struct trace_array *tr,
 
         event   = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
                                            &irq_flags);
-        if (!event)
+        if (!event) {
+                atomic_inc(&dropped_count);
                 return;
+        }
         entry   = ring_buffer_event_data(event);
         tracing_generic_entry_update(&entry->ent, 0, preempt_count());
         entry->ent.type                 = TRACE_MMIO_RW;
@@ -338,8 +342,10 @@ static void __trace_mmiotrace_map(struct trace_array *tr,
 
         event   = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
                                            &irq_flags);
-        if (!event)
+        if (!event) {
+                atomic_inc(&dropped_count);
                 return;
+        }
         entry   = ring_buffer_event_data(event);
         tracing_generic_entry_update(&entry->ent, 0, preempt_count());
         entry->ent.type                 = TRACE_MMIO_MAP;
diff --git a/kernel/trace/trace_selftest.c b/kernel/trace/trace_selftest.c
index 88c8eb70f54a..bc8e80a86bca 100644
--- a/kernel/trace/trace_selftest.c
+++ b/kernel/trace/trace_selftest.c
@@ -23,10 +23,20 @@ static int trace_test_buffer_cpu(struct trace_array *tr, int cpu)
 {
         struct ring_buffer_event *event;
         struct trace_entry *entry;
+        unsigned int loops = 0;
 
         while ((event = ring_buffer_consume(tr->buffer, cpu, NULL))) {
                 entry = ring_buffer_event_data(event);
 
+                /*
+                 * The ring buffer is a size of trace_buf_size, if
+                 * we loop more than the size, there's something wrong
+                 * with the ring buffer.
+                 */
+                if (loops++ > trace_buf_size) {
+                        printk(KERN_CONT ".. bad ring buffer ");
+                        goto failed;
+                }
                 if (!trace_valid_entry(entry)) {
                         printk(KERN_CONT ".. invalid entry %d ",
                                 entry->type);
@@ -57,11 +67,20 @@ static int trace_test_buffer(struct trace_array *tr, unsigned long *count)
 
         cnt = ring_buffer_entries(tr->buffer);
 
+        /*
+         * The trace_test_buffer_cpu runs a while loop to consume all data.
+         * If the calling tracer is broken, and is constantly filling
+         * the buffer, this will run forever, and hard lock the box.
+         * We disable the ring buffer while we do this test to prevent
+         * a hard lock up.
+         */
+        tracing_off();
         for_each_possible_cpu(cpu) {
                 ret = trace_test_buffer_cpu(tr, cpu);
                 if (ret)
                         break;
         }
+        tracing_on();
         __raw_spin_unlock(&ftrace_max_lock);
         local_irq_restore(flags);
 
diff --git a/kernel/tsacct.c b/kernel/tsacct.c
index 43f891b05a4b..00d59d048edf 100644
--- a/kernel/tsacct.c
+++ b/kernel/tsacct.c
@@ -122,8 +122,10 @@ void acct_update_integrals(struct task_struct *tsk)
         if (likely(tsk->mm)) {
                 cputime_t time, dtime;
                 struct timeval value;
+                unsigned long flags;
                 u64 delta;
 
+                local_irq_save(flags);
                 time = tsk->stime + tsk->utime;
                 dtime = cputime_sub(time, tsk->acct_timexpd);
                 jiffies_to_timeval(cputime_to_jiffies(dtime), &value);
@@ -131,10 +133,12 @@ void acct_update_integrals(struct task_struct *tsk)
                 delta = delta * USEC_PER_SEC + value.tv_usec;
 
                 if (delta == 0)
-                        return;
+                        goto out;
                 tsk->acct_timexpd = time;
                 tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm);
                 tsk->acct_vm_mem1 += delta * tsk->mm->total_vm;
+        out:
+                local_irq_restore(flags);
         }
 }
 
diff --git a/kernel/user.c b/kernel/user.c
index 477b6660f447..fbb300e6191f 100644
--- a/kernel/user.c
+++ b/kernel/user.c
@@ -72,6 +72,7 @@ static void uid_hash_insert(struct user_struct *up, struct hlist_head *hashent)
 static void uid_hash_remove(struct user_struct *up)
 {
         hlist_del_init(&up->uidhash_node);
+        put_user_ns(up->user_ns);
 }
 
 static struct user_struct *uid_hash_find(uid_t uid, struct hlist_head *hashent)
@@ -285,14 +286,12 @@ int __init uids_sysfs_init(void)
 /* work function to remove sysfs directory for a user and free up
  * corresponding structures.
  */
-static void remove_user_sysfs_dir(struct work_struct *w)
+static void cleanup_user_struct(struct work_struct *w)
 {
         struct user_struct *up = container_of(w, struct user_struct, work);
         unsigned long flags;
         int remove_user = 0;
 
-        if (up->user_ns != &init_user_ns)
-                return;
         /* Make uid_hash_remove() + sysfs_remove_file() + kobject_del()
          * atomic.
          */
@@ -311,9 +310,11 @@ static void remove_user_sysfs_dir(struct work_struct *w)
         if (!remove_user)
                 goto done;
 
-        kobject_uevent(&up->kobj, KOBJ_REMOVE);
-        kobject_del(&up->kobj);
-        kobject_put(&up->kobj);
+        if (up->user_ns == &init_user_ns) {
+                kobject_uevent(&up->kobj, KOBJ_REMOVE);
+                kobject_del(&up->kobj);
+                kobject_put(&up->kobj);
+        }
 
         sched_destroy_user(up);
         key_put(up->uid_keyring);
@@ -334,8 +335,7 @@ static void free_user(struct user_struct *up, unsigned long flags)
         atomic_inc(&up->__count);
         spin_unlock_irqrestore(&uidhash_lock, flags);
 
-        put_user_ns(up->user_ns);
-        INIT_WORK(&up->work, remove_user_sysfs_dir);
+        INIT_WORK(&up->work, cleanup_user_struct);
         schedule_work(&up->work);
 }
 
@@ -357,12 +357,29 @@ static void free_user(struct user_struct *up, unsigned long flags)
         sched_destroy_user(up);
         key_put(up->uid_keyring);
         key_put(up->session_keyring);
-        put_user_ns(up->user_ns);
         kmem_cache_free(uid_cachep, up);
 }
 
 #endif
 
+#if defined(CONFIG_RT_GROUP_SCHED) && defined(CONFIG_USER_SCHED)
+/*
+ * We need to check if a setuid can take place. This function should be called
+ * before successfully completing the setuid.
+ */
+int task_can_switch_user(struct user_struct *up, struct task_struct *tsk)
+{
+
+        return sched_rt_can_attach(up->tg, tsk);
+
+}
+#else
+int task_can_switch_user(struct user_struct *up, struct task_struct *tsk)
+{
+        return 1;
+}
+#endif
+
 /*
  * Locate the user_struct for the passed UID.  If found, take a ref on it.  The
  * caller must undo that ref with free_uid().
diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c
index 79084311ee57..076c7c8215b0 100644
--- a/kernel/user_namespace.c
+++ b/kernel/user_namespace.c
@@ -60,12 +60,25 @@ int create_user_ns(struct cred *new)
         return 0;
 }
 
-void free_user_ns(struct kref *kref)
+/*
+ * Deferred destructor for a user namespace.  This is required because
+ * free_user_ns() may be called with uidhash_lock held, but we need to call
+ * back to free_uid() which will want to take the lock again.
+ */
+static void free_user_ns_work(struct work_struct *work)
 {
-        struct user_namespace *ns;
-
-        ns = container_of(kref, struct user_namespace, kref);
+        struct user_namespace *ns =
+                container_of(work, struct user_namespace, destroyer);
         free_uid(ns->creator);
         kfree(ns);
 }
+
+void free_user_ns(struct kref *kref)
+{
+        struct user_namespace *ns =
+                container_of(kref, struct user_namespace, kref);
+
+        INIT_WORK(&ns->destroyer, free_user_ns_work);
+        schedule_work(&ns->destroyer);
+}
 EXPORT_SYMBOL(free_user_ns);