Merge branch 'linus' into core/percpu

Conflicts:
	kernel/irq/handle.c

4 files changed, 45 insertions, 19 deletions

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index c29831076e7a..5a54ff42874e 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -1115,8 +1115,10 @@ static void cgroup_kill_sb(struct super_block *sb) {
         }
         write_unlock(&css_set_lock);
 
-        list_del(&root->root_list);
-        root_count--;
+        if (!list_empty(&root->root_list)) {
+                list_del(&root->root_list);
+                root_count--;
+        }
 
         mutex_unlock(&cgroup_mutex);
 
@@ -2434,7 +2436,9 @@ static long cgroup_create(struct cgroup *parent, struct dentry *dentry,
 
  err_remove:
 
+        cgroup_lock_hierarchy(root);
         list_del(&cgrp->sibling);
+        cgroup_unlock_hierarchy(root);
         root->number_of_cgroups--;
 
  err_destroy:
@@ -2507,7 +2511,7 @@ static int cgroup_clear_css_refs(struct cgroup *cgrp)
         for_each_subsys(cgrp->root, ss) {
                 struct cgroup_subsys_state *css = cgrp->subsys[ss->subsys_id];
                 int refcnt;
-                do {
+                while (1) {
                         /* We can only remove a CSS with a refcnt==1 */
                         refcnt = atomic_read(&css->refcnt);
                         if (refcnt > 1) {
@@ -2521,7 +2525,10 @@ static int cgroup_clear_css_refs(struct cgroup *cgrp)
                          * css_tryget() to spin until we set the
                          * CSS_REMOVED bits or abort
                          */
-                } while (atomic_cmpxchg(&css->refcnt, refcnt, 0) != refcnt);
+                        if (atomic_cmpxchg(&css->refcnt, refcnt, 0) == refcnt)
+                                break;
+                        cpu_relax();
+                }
         }
  done:
         for_each_subsys(cgrp->root, ss) {
@@ -2991,20 +2998,21 @@ int cgroup_clone(struct task_struct *tsk, struct cgroup_subsys *subsys,
                 mutex_unlock(&cgroup_mutex);
                 return 0;
         }
-        task_lock(tsk);
-        cg = tsk->cgroups;
-        parent = task_cgroup(tsk, subsys->subsys_id);
 
         /* Pin the hierarchy */
-        if (!atomic_inc_not_zero(&parent->root->sb->s_active)) {
+        if (!atomic_inc_not_zero(&root->sb->s_active)) {
                 /* We race with the final deactivate_super() */
                 mutex_unlock(&cgroup_mutex);
                 return 0;
         }
 
         /* Keep the cgroup alive */
+        task_lock(tsk);
+        parent = task_cgroup(tsk, subsys->subsys_id);
+        cg = tsk->cgroups;
         get_css_set(cg);
         task_unlock(tsk);
+
         mutex_unlock(&cgroup_mutex);
 
         /* Now do the VFS work to create a cgroup */
@@ -3043,7 +3051,7 @@ int cgroup_clone(struct task_struct *tsk, struct cgroup_subsys *subsys,
                 mutex_unlock(&inode->i_mutex);
                 put_css_set(cg);
 
-                deactivate_super(parent->root->sb);
+                deactivate_super(root->sb);
                 /* The cgroup is still accessible in the VFS, but
                  * we're not going to try to rmdir() it at this
                  * point. */
@@ -3069,7 +3077,7 @@ int cgroup_clone(struct task_struct *tsk, struct cgroup_subsys *subsys,
         mutex_lock(&cgroup_mutex);
         put_css_set(cg);
         mutex_unlock(&cgroup_mutex);
-        deactivate_super(parent->root->sb);
+        deactivate_super(root->sb);
         return ret;
 }
 
diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index 375d68cd5bf0..f51eaee921b6 100644
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -40,6 +40,18 @@ void handle_bad_irq(unsigned int irq, struct irq_desc *desc)
         ack_bad_irq(irq);
 }
 
+#if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_HARDIRQS)
+static void __init init_irq_default_affinity(void)
+{
+        alloc_bootmem_cpumask_var(&irq_default_affinity);
+        cpumask_setall(irq_default_affinity);
+}
+#else
+static void __init init_irq_default_affinity(void)
+{
+}
+#endif
+
 /*
  * Linux has a controller-independent interrupt architecture.
  * Every controller has a 'controller-template', that is used
@@ -133,6 +145,8 @@ int __init early_irq_init(void)
         int legacy_count;
         int i;
 
+        init_irq_default_affinity();
+
          /* initialize nr_irqs based on nr_cpu_ids */
         arch_probe_nr_irqs();
         printk(KERN_INFO "NR_IRQS:%d nr_irqs:%d\n", NR_IRQS, nr_irqs);
@@ -229,6 +243,8 @@ int __init early_irq_init(void)
         int count;
         int i;
 
+        init_irq_default_affinity();
+
         printk(KERN_INFO "NR_IRQS:%d\n", NR_IRQS);
 
         desc = irq_desc;
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index b98739af4558..a3a5dc9ef346 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -15,17 +15,9 @@
 
 #include "internals.h"
 
-#ifdef CONFIG_SMP
+#if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_HARDIRQS)
 cpumask_var_t irq_default_affinity;
 
-static int init_irq_default_affinity(void)
-{
-        alloc_cpumask_var(&irq_default_affinity, GFP_KERNEL);
-        cpumask_setall(irq_default_affinity);
-        return 0;
-}
-core_initcall(init_irq_default_affinity);
-
 /**
  *      synchronize_irq - wait for pending IRQ handlers (on other CPUs)
  *      @irq: interrupt number to wait for
diff --git a/kernel/power/disk.c b/kernel/power/disk.c
index 45e8541ab7e3..432ee575c9ee 100644
--- a/kernel/power/disk.c
+++ b/kernel/power/disk.c
@@ -71,6 +71,14 @@ void hibernation_set_ops(struct platform_hibernation_ops *ops)
         mutex_unlock(&pm_mutex);
 }
 
+static bool entering_platform_hibernation;
+
+bool system_entering_hibernation(void)
+{
+        return entering_platform_hibernation;
+}
+EXPORT_SYMBOL(system_entering_hibernation);
+
 #ifdef CONFIG_PM_DEBUG
 static void hibernation_debug_sleep(void)
 {
@@ -411,6 +419,7 @@ int hibernation_platform_enter(void)
         if (error)
                 goto Close;
 
+        entering_platform_hibernation = true;
         suspend_console();
         error = device_suspend(PMSG_HIBERNATE);
         if (error) {
@@ -445,6 +454,7 @@ int hibernation_platform_enter(void)
  Finish:
         hibernation_ops->finish();
  Resume_devices:
+        entering_platform_hibernation = false;
         device_resume(PMSG_RESTORE);
         resume_console();
  Close: