[tip:locking/core] sched/core: Remove false-positive warning from wake_up_process()

[tip-bot for Sasha Levin]

Commit-ID:  119d6f6a3be8b424b200dcee56e74484d5445f7e
Gitweb:     http://git.kernel.org/tip/119d6f6a3be8b424b200dcee56e74484d5445f7e
Author:     Sasha Levin <sasha.levin@xxxxxxxxxx>
AuthorDate: Mon, 30 Nov 2015 20:34:20 -0500
Committer:  Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Fri, 4 Dec 2015 10:10:16 +0100

sched/core: Remove false-positive warning from wake_up_process()

Because wakeups can (fundamentally) be late, a task might not be in
the expected state. Therefore testing against a task's state is racy,
and can yield false positives.

Signed-off-by: Sasha Levin <sasha.levin@xxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Acked-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Mike Galbraith <efault@xxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: oleg@xxxxxxxxxx
Fixes: 9067ac85d533 ("wake_up_process() should be never used to wakeup a TASK_STOPPED/TRACED task")
Link: http://lkml.kernel.org/r/1448933660-23082-1-git-send-email-sasha.levin@xxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
 kernel/sched/core.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 4d568ac..fc8c987 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -2039,7 +2039,6 @@ out:
  */
 int wake_up_process(struct task_struct *p)
 {
-	WARN_ON(task_is_stopped_or_traced(p));
 	return try_to_wake_up(p, TASK_NORMAL, 0);
 }
 EXPORT_SYMBOL(wake_up_process);
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