RE: [PATCH 3/3] netfilter: x_tables: fix ordering of jumpstack allocation and table update
From: Eric Dumazet <hidden>
Date: 2013-10-23 12:13:33
Also in:
netfilter-devel
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.