linux-kernel - Re: RELEASE BLOCKER: Linux doesn't follow x86/x86-64 ABI wrt direction flag

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Message-ID: <47CF1931.2080102@zytor.com>
Date:	Wed, 05 Mar 2008 14:05:37 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Chris Lattner <clattner@...le.com>
CC:	Richard Guenther <richard.guenther@...il.com>,
	Joe Buck <Joe.Buck@...opsys.com>, Michael Matz <matz@...e.de>,
	Jan Hubicka <hubicka@....cz>,
	Aurelien Jarno <aurelien@...el32.net>,
	linux-kernel@...r.kernel.org, gcc@....gnu.org
Subject: Re: RELEASE BLOCKER: Linux doesn't follow x86/x86-64 ABI wrt direction
 flag

Chris Lattner wrote:
> 
> On Mar 5, 2008, at 1:34 PM, H. Peter Anvin wrote:
> 
>> Richard Guenther wrote:
>>> We didn't yet run into this issue and build openSUSE with 4.3 since 
>>> more than
>>> three month.
>>
>> Well, how often do you take a trap inside an overlapping memmove()?
> 
> How hard is it to change the kernel signal entry path from "pushf" to 
> "pushf;cld"?  Problem solved, no?

Not quite, but fixing it in the kernel is easy.

Still breaks for running on all old kernels.

	-hpa
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