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From: David Miller <davem@davemloft.net>
Subject: Re: [RFC] csum experts, csum_replace2() is too expensive
Date: Fri, 21 Mar 2014 14:52:29 -0400 (EDT)
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From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Fri, 21 Mar 2014 05:50:50 -0700

> It looks like a barrier() would be more appropriate.

barrier() == __asm__ __volatile__(:::"memory")