Commit-ID: de30ec47302c101c7badc8fe687641fd75e596e7
Gitweb: http://git.kernel.org/tip/de30ec47302c101c7badc8fe687641fd75e596e7
Author: Nicholas Mc Guire <der.herr@xxxxxxx>
AuthorDate: Sat, 17 Jan 2015 05:05:34 +0100
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Wed, 4 Feb 2015 07:57:36 +0100
sched/completion: Remove unnecessary ->wait.lock serialization when reading completion state
Signed-off-by: Nicholas Mc Guire <der.herr@xxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/1421467534-22834-1-git-send-email-der.herr@xxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
kernel/sched/completion.c | 9 +--------
1 file changed, 1 insertion(+), 8 deletions(-)
diff --git a/kernel/sched/completion.c b/kernel/sched/completion.c
index 607f852..9d1fe32d 100644
--- a/kernel/sched/completion.c
+++ b/kernel/sched/completion.c
@@ -288,13 +288,6 @@ EXPORT_SYMBOL(try_wait_for_completion);
*/
bool completion_done(struct completion *x)
{
- unsigned long flags;
- int ret = 1;
-
- spin_lock_irqsave(&x->wait.lock, flags);
- if (!x->done)
- ret = 0;
- spin_unlock_irqrestore(&x->wait.lock, flags);
- return ret;
+ return !!ACCESS_ONCE(x->done);
}
EXPORT_SYMBOL(completion_done);
--
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