| From | "Paul E. McKenney" <> | Subject | [PATCH RFC tip/core/rcu 08/15] seqlock: Remove now-redundant smp_read_barrier_depends() | Date | Mon, 9 Oct 2017 17:22:42 -0700 |
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READ_ONCE() now implies smp_read_barrier_depends(), so this patch removes the now-redundant smp_read_barrier_depends() from raw_read_seqcount_latch().
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ingo Molnar <mingo@redhat.com> --- include/linux/seqlock.h | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/include/linux/seqlock.h b/include/linux/seqlock.h index ead97654c4e9..27364347ff68 100644 --- a/include/linux/seqlock.h +++ b/include/linux/seqlock.h @@ -277,9 +277,8 @@ static inline void raw_write_seqcount_barrier(seqcount_t *s) static inline int raw_read_seqcount_latch(seqcount_t *s) { - int seq = READ_ONCE(s->sequence); /* Pairs with the first smp_wmb() in raw_write_seqcount_latch() */ - smp_read_barrier_depends(); + int seq = READ_ONCE(s->sequence); /* ^^^ */ return seq; } -- 2.5.2
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