linux-kernel - Re: [PATCH] mm: PageLRU can be non-atomic bit operation

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Message-Id: <200704251059.24994.ak@suse.de>
Date:	Wed, 25 Apr 2007 10:59:24 +0200
From:	Andi Kleen <ak@...e.de>
To:	Fernando Luis Vázquez Cao 
	<fernando@....ntt.co.jp>
Cc:	Hugh Dickins <hugh@...itas.com>,
	Hisashi Hifumi <hifumi.hisashi@....ntt.co.jp>,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: PageLRU can be non-atomic bit operation


> This seems to imply that we need the lock prefix even when updating
> different bits within the same long (not just the same byte). Is this
> interpretation correct?

Yes, that is what I said. The consistency applies to loads/stores
(so e.g. for 128bit SSE2 load/stores too), not bytes.

The current IA32 manuals have a more detailed description of the rules 
in volume 3

-Andi
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