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| author | Jason Baron <jbaron@akamai.com> | 2014-07-02 15:52:44 +0000 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2014-07-16 13:38:21 +0200 |
| commit | 5cd08fbfdb6baa9fe98f530b76898fc5725a6289 (patch) | |
| tree | b4f9df78a954c306cacea7372d920d1eb373140f /arch | |
| parent | 6e76ea8a8209386c3cc7ee5594e6ea5d25525cf2 (diff) | |
| download | op-kernel-dev-5cd08fbfdb6baa9fe98f530b76898fc5725a6289.zip op-kernel-dev-5cd08fbfdb6baa9fe98f530b76898fc5725a6289.tar.gz | |
sched: Fix static_key race with sched_feat()
As pointed out by Andi Kleen, the usage of static keys can be racy in
sched_feat_disable() vs. sched_feat_enable(). Currently, we first check the
value of keys->enabled, and subsequently update the branch direction. This,
can be racy and can potentially leave the keys in an inconsistent state.
Take the i_mutex around these calls to resolve the race.
Reported-by: Andi Kleen <andi@firstfloor.org>
Signed-off-by: Jason Baron <jbaron@akamai.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: rostedt@goodmis.org
Link: http://lkml.kernel.org/r/9d7780c83db26683955cd01e6bc654ee2586e67f.1404315388.git.jbaron@akamai.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch')
0 files changed, 0 insertions, 0 deletions
