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seqlock: Remove now-redundant smp_read_barrier_depends()

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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>
This commit is contained in:
Paul E. McKenney 2017-10-09 11:00:32 -07:00
parent 1ba9c5e6c6
commit 98b2273784
1 changed files with 1 additions and 2 deletions
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3
include/linux/seqlock.h
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@ -278,9 +278,8 @@ 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;
}