linux-kernel - Re: [BUG FIX] Make x86_32 uni-processor Atomic ops, Atomic

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Message-ID: <20090522215939.GI846@one.firstfloor.org>
Date:	Fri, 22 May 2009 23:59:39 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Samuel Thibault <samuel.thibault@...-lyon.org>,
	"Michael S. Zick" <lkml@...ethan.org>,
	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org
Subject: Re: [BUG FIX] Make x86_32 uni-processor Atomic ops, Atomic

> > - You got bus master DMA in your test machine?
> 
> That's not related to the LOCK_PREFIX concern, which is about the
> processor only, not interaction with other devices.

Actually it's related to other devices; but only very few (most MMIO
doesn't support atomic cycles and is uncached anyways). But there's no driver 
for real hardware in Linux that relies on it to my knowledge.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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