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

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Message-ID: <20090522221456.GK846@one.firstfloor.org>
Date:	Sat, 23 May 2009 00:14:56 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Samuel Thibault <samuel.thibault@...-lyon.org>,
	Andi Kleen <andi@...stfloor.org>,
	"Michael S. Zick" <lkml@...ethan.org>, linux-kernel@...r.kernel.org
Subject: Re: [BUG FIX] Make x86_32 uni-processor Atomic ops, Atomic

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

PCI has a locked transaction, but I don't think it's widely supported.
With normal uncached access it is also not very useful.

> processor-device interaction.

Well in Linux yes, but not architecturally in x86. That is why the CPUs
don't just nop it out with a single core (which Michael assumes they do,
but they don't)

-Andi

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