netdev - RE: [PATCH 3/3] netfilter: x_tables: fix ordering of jumpstack allocation and table update

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Date:	Wed, 23 Oct 2013 05:13:33 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Laight <David.Laight@...LAB.COM>
Cc:	Pablo Neira Ayuso <pablo@...filter.org>,
	netfilter-devel@...r.kernel.org, davem@...emloft.net,
	netdev@...r.kernel.org
Subject: RE: [PATCH 3/3] netfilter: x_tables: fix ordering of jumpstack
 allocation and table update

On Wed, 2013-10-23 at 10:45 +0100, David Laight wrote:

> Those writes were in the wrong order on all systems.
> Also gcc needs to be told not to reorder the writes even on non-smp
> systems (if the code might be pre-empted).
> So an asm volatile (:::"memory") is needed there even if no specific
> synchronisation instruction is needed.

smp_wmb() contains this compiler barrier already.



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