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

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Message-Id: <200905241409.42563.lkml@morethan.org>
Date:	Sun, 24 May 2009 14:09:40 -0500
From:	"Michael S. Zick" <lkml@...ethan.org>
To:	"H. Peter Anvin" <hpa@...or.com>
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

On Sun May 24 2009, H. Peter Anvin wrote:
> 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.
> 

Not an issue at the moment, will cover that when I audit my own code.

Mike
> 	-hpa
> 


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