Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input

[firefly-linux-kernel-4.4.55.git] / kernel / sched / auto_group.h

diff --git a/kernel/sched/auto_group.h b/kernel/sched/auto_group.h
index 443232ebbb53b24ea369ca3c4fbb7b53c5e8cbef..890c95f2587a4d8c530c1a5df69eef8a65e5eaf7 100644 (file)
--- a/kernel/sched/auto_group.h
+++ b/kernel/sched/auto_group.h
@@ -4,6 +4,11 @@
 #include <linux/rwsem.h>
 
 struct autogroup {
+       /*
+        * reference doesn't mean how many thread attach to this
+        * autogroup now. It just stands for the number of task
+        * could use this autogroup.
+        */
        struct kref             kref;
        struct task_group       *tg;
        struct rw_semaphore     lock;
@@ -24,7 +29,7 @@ extern bool task_wants_autogroup(struct task_struct *p, struct task_group *tg);
 static inline struct task_group *
 autogroup_task_group(struct task_struct *p, struct task_group *tg)
 {
-       int enabled = ACCESS_ONCE(sysctl_sched_autogroup_enabled);
+       int enabled = READ_ONCE(sysctl_sched_autogroup_enabled);
 
        if (enabled && task_wants_autogroup(p, tg))
                return p->signal->autogroup->tg;