3.16.7-ckt22 -stable review patch. If anyone has any objections, please let me
know.
------------------
From: Sasha Levin <sasha.le...@oracle.com>
commit 119d6f6a3be8b424b200dcee56e74484d5445f7e upstream.
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.le...@oracle.com>
Signed-off-by: Peter Zijlstra (Intel) <pet...@infradead.org>
Acked-by: Linus Torvalds <torva...@linux-foundation.org>
Cc: Mike Galbraith <efa...@gmx.de>
Cc: Peter Zijlstra <pet...@infradead.org>
Cc: Thomas Gleixner <t...@linutronix.de>
Cc: o...@redhat.com
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.le...@oracle.com
Signed-off-by: Ingo Molnar <mi...@kernel.org>
Signed-off-by: Luis Henriques <luis.henriq...@canonical.com>
---
kernel/sched/core.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 0417f4b1a5f3..c49c16c405b7 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -1772,7 +1772,6 @@ 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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