Date: Thu, 21 Aug 2003 23:48:24 +0200
From: Stephan von Krawczynski <skraw@ithnet.com>
To: Andrea Arcangeli <andrea@suse.de>
Cc: manfred@colorfullife.com, tejun@aratech.co.kr,
       linux-kernel@vger.kernel.org, zwane@linuxpower.ca
Subject: Re: Possible race condition in i386 global_irq_lock handling.
Message-Id: <20030821234824.37497c08.skraw@ithnet.com>
In-Reply-To: <20030821172721.GI29612@dualathlon.random>
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	<20030821172721.GI29612@dualathlon.random>
Organization: ith Kommunikationstechnik GmbH
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> smb_rmb is enough in practice for x86 (in asm-i386), but not the right
> barrier in general because rmb only serializes reads against reads, so
> it would also make little sense while reading the i386 code. here you've
> to serialize a write against a read so it would be misleading unless you
> know exactly the lowlevel implementations of those barriers.
> 
> smp_mb() before the while loop should be the correct barrier for all
> archs and the asm generated on x86 will be the same.
> 
> alpha, ia64 and x86-64 (and probably others) needs it too.

Can some kind soul please provide me with the needed mini-patch. I would like
to try that on my constantly crashing SMP test box...

Regards,
Stephan
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