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authorPaul E. McKenney <paulmck@kernel.org>2020-01-03 15:59:12 -0800
committerPaul E. McKenney <paulmck@kernel.org>2020-02-20 15:58:22 -0800
commit0050c7b2d27c3cc126df59bd8094fb3d25b00ade (patch)
tree6d398b15f88c3e6a876e5d406a8fe5f176bff03d /kernel/locking
parent105abf82b0a62664edabcd4c5b4d9414c74ef399 (diff)
locking/rtmutex: rcu: Add WRITE_ONCE() to rt_mutex ->owner
The rt_mutex structure's ->owner field is read locklessly, so this commit adds the WRITE_ONCE() to an update in order to provide proper documentation and READ_ONCE()/WRITE_ONCE() pairing. This data race was reported by KCSAN. Not appropriate for backporting due to failure being unlikely. Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Will Deacon <will@kernel.org>
Diffstat (limited to 'kernel/locking')
-rw-r--r--kernel/locking/rtmutex.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/locking/rtmutex.c b/kernel/locking/rtmutex.c
index 851bbb10819d..c9f090d64f00 100644
--- a/kernel/locking/rtmutex.c
+++ b/kernel/locking/rtmutex.c
@@ -57,7 +57,7 @@ rt_mutex_set_owner(struct rt_mutex *lock, struct task_struct *owner)
if (rt_mutex_has_waiters(lock))
val |= RT_MUTEX_HAS_WAITERS;
- lock->owner = (struct task_struct *)val;
+ WRITE_ONCE(lock->owner, (struct task_struct *)val);
}
static inline void clear_rt_mutex_waiters(struct rt_mutex *lock)