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

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Message-ID: <20090522220049.GD10166@const.famille.thibault.fr>
Date:	Sat, 23 May 2009 00:00:49 +0200
From:	Samuel Thibault <samuel.thibault@...-lyon.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	"Michael S. Zick" <lkml@...ethan.org>, linux-kernel@...r.kernel.org
Subject: Re: [BUG FIX] Make x86_32 uni-processor Atomic ops, Atomic

Andi Kleen, le Fri 22 May 2009 23:59:39 +0200, a écrit :
> > > - 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.

That's what I meant: AIUI, LOCK_PREFIX has always only been used for
inter-processor interaction (atomic variables, spinlocks, etc.), not for
processor-device interaction.

Samuel
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