For both set and clear_bit, we can avoid the unnecessary barriers
on non LL/SC architectures, such as x86. Instead, use the
smp_mb__{before,after}_atomic() calls.

Signed-off-by: Davidlohr Bueso <redacted>
---
security/keys/gc.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/security/keys/gc.c b/security/keys/gc.c
index 671dd730ecfc..ce7b4c22e3c4 100644
--- a/security/keys/gc.c
+++ b/security/keys/gc.c

@@ -102,7 +102,7 @@ void key_gc_keytype(struct key_type *ktype)

	key_gc_dead_keytype = ktype;
	set_bit(KEY_GC_REAPING_KEYTYPE, &key_gc_flags);
-	smp_mb();
+	smp_mb__after_atomic();
	set_bit(KEY_GC_REAP_KEYTYPE, &key_gc_flags);

	kdebug("schedule");

@@ -308,7 +308,7 @@ static void key_garbage_collector(struct work_struct *work)

	if (unlikely(gc_state & KEY_GC_REAPING_DEAD_3)) {
		kdebug("dead wake");
-		smp_mb();
+		smp_mb__before_atomic();
		clear_bit(KEY_GC_REAPING_KEYTYPE, &key_gc_flags);
		wake_up_bit(&key_gc_flags, KEY_GC_REAPING_KEYTYPE);
	}
-- 
2.16.4