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Date: Sun, 9 Jul 2006 16:28:00 +0200 (CEST)
From: Roman Zippel <zippel@linux-m68k.org>
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To: Linus Torvalds <torvalds@osdl.org>
cc: Keith Owens <kaos@ocs.com.au>, Andi Kleen <ak@suse.de>,
       Jan Hubicka <jh@suse.cz>, "David S. Miller" <davem@davemloft.net>,
       Richard Henderson <rth@redhat.com>, Ingo Molnar <mingo@elte.hu>,
       Andrew Morton <akpm@osdl.org>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       arjan@infradead.org
Subject: Re: [patch] spinlocks: remove 'volatile' 
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Hi,

On Sat, 8 Jul 2006, Linus Torvalds wrote:

> but we've been using that "+m" format for a long time already (and I 
> _think_ we did so at the suggestion of gcc people), and it would be much 
> better if the gcc documentation was just fixed here.

IIRC early 4.0 had problems with "+m" and did what the documentation says, 
but that got quickly fixed.
Here is the old thread http://marc.theaimsgroup.com/?t=108384517900001&r=1&w=2

bye, Roman