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Date:	Wed, 9 Dec 2015 03:52:12 +0100
From:	Thomas Graf <>
To:	Herbert Xu <>
Cc:	"David S. Miller" <>,
	Eric Dumazet <>,
	Josh Triplett <>,
	"Paul E. McKenney" <>,
Subject: Re: rhashtable: Remove unnecessary wmb for future_tbl

On 12/08/15 at 05:09pm, Herbert Xu wrote:
> 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 <>

The RELEASE which is now in place afterwards act as a wmb as well,
we are well protected ;-)

Acked-by: Thomas Graf <>
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