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authorWill Deacon <will.deacon@arm.com>2017-10-24 11:22:48 +0100
committerIngo Molnar <mingo@kernel.org>2017-10-24 13:17:33 +0200
commit506458efaf153c1ea480591c5602a5a3ba5a3b76 (patch)
treec4ac0a89bf23993036720ec8883fff0740bf9019 /mm/slab.h
parent76ebbe78f7390aee075a7f3768af197ded1bdfbb (diff)
locking/barriers: Convert users of lockless_dereference() to READ_ONCE()
READ_ONCE() now has an implicit smp_read_barrier_depends() call, so it can be used instead of lockless_dereference() without any change in semantics. Signed-off-by: Will Deacon <will.deacon@arm.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1508840570-22169-4-git-send-email-will.deacon@arm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'mm/slab.h')
-rw-r--r--mm/slab.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/slab.h b/mm/slab.h
index 073362816acc..8894f811a89d 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -258,7 +258,7 @@ cache_from_memcg_idx(struct kmem_cache *s, int idx)
* memcg_caches issues a write barrier to match this (see
* memcg_create_kmem_cache()).
*/
- cachep = lockless_dereference(arr->entries[idx]);
+ cachep = READ_ONCE(arr->entries[idx]);
rcu_read_unlock();
return cachep;