From: Herbert Xu <herb...@gondor.apana.org.au>
Date: Tue, 8 Dec 2015 17:09:04 +0800
> The patch 9497df88ab5567daa001829051c5f87161a81ff0 ("rhashtable:
> Fix reader/rehash race") added a pair of barriers. In fact the
> wmb is superfluous because every subsequent write to the old or
> new hash table uses rcu_assign_pointer, which itself carriers a
> full barrier prior to the assignment.
>
> Therefore we may remove the explicit wmb.
>
> Signed-off-by: Herbert Xu <herb...@gondor.apana.org.au>
Applied to net-next.
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