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ptr_ring: Remove now-redundant smp_read_barrier_depends() 

Because READ_ONCE() now implies smp_read_barrier_depends(), the
smp_read_barrier_depends() in __ptr_ring_consume() is redundant;
this commit removes it and updates the comments.

Signed-off-by: Andrea Parri <parri.andrea@gmail.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Jason Wang <jasowang@redhat.com>
Cc: John Fastabend <john.fastabend@gmail.com>
Cc: Eric Dumazet <edumazet@google.com>
Cc: <linux-kernel@vger.kernel.org>
Cc: <netdev@vger.kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andrea Parri 2018-02-16 12:06:13 +01:00 committed by David S. Miller
parent 1ec010e705
commit e3f9f41757
1 changed files with 4 additions and 3 deletions
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7
include/linux/ptr_ring.h
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@ -296,13 +296,14 @@ static inline void *__ptr_ring_consume(struct ptr_ring *r)
{
void *ptr;
/* The READ_ONCE in __ptr_ring_peek guarantees that anyone
* accessing data through the pointer is up to date. Pairs
* with smp_wmb in __ptr_ring_produce.
*/
ptr = __ptr_ring_peek(r);
if (ptr)
__ptr_ring_discard_one(r);
/* Make sure anyone accessing data through the pointer is up to date. */
/* Pairs with smp_wmb in __ptr_ring_produce. */
smp_read_barrier_depends();
return ptr;
}