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

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Message-ID: <4A198B24.9040404@zytor.com>
Date:	Sun, 24 May 2009 11:00:04 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	lkml@...ethan.org
CC:	Harald Welte <HaraldWelte@...tech.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [BUG FIX] Make x86_32 uni-processor Atomic ops, Atomic

Michael S. Zick wrote:
> 
> @hpa - I still like your suggestion that it is only one (or a few)
> uses of atomic ops that is incorrect and in general atomic ops
> should compile away on uni-processor.
> 

Actually, the more I think about it the more I suspect there is a race
condition either in the chip set or in any VIA-specific drivers (if
there are any.)  Putting LOCKs in random places will slow the CPU down
significantly, so it might resolve the race condition without actually
solving the problem.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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