linux-kernel - Re: [PATCH] net: fix race in the receive/select

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Message-ID: <20090701033924.GA29762@gondor.apana.org.au>
Date:	Wed, 1 Jul 2009 11:39:24 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	jolsa@...hat.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, fbl@...hat.com, nhorman@...hat.com,
	davem@...hat.com, oleg@...hat.com, eric.dumazet@...il.com
Subject: Re: [PATCH] net: fix race in the receive/select

Andi Kleen <andi@...stfloor.org> wrote:
> 
> At least on x86 I can't see how it happens. mb() is only a compile
> time barrier and the compiler doesn't optimize over indirect callbacks
> like __pollwait() anyways.

mb() does more than just a compiler barrier, it also issues mfence.

Cheers,
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