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

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Message-ID: <4A1995F0.6040602@zytor.com>
Date:	Sun, 24 May 2009 11:46:08 -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:
> 
> Note: I have seem to recall that newer gcc's optimizer presume 
> that the flags register is preserved across asm - 
> It didn't use to do that - but there is now a "cc" to deal with
> that - Have not yet audited for that, but it is high on my list.
> 

I am pretty sure that's false... if it was true we'd have failures all
over the kernel.

	-hpa

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

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