linux-kernel - Re: [patch] x86: fix taking DNA during 64bit sigreturn

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Message-ID: <4738EBB6.7060605@zytor.com>
Date:	Mon, 12 Nov 2007 16:11:34 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andi Kleen <ak@...e.de>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	linux-kernel@...r.kernel.org, mingo@...e.hu, tglx@...utronix.de,
	akpm@...ux-foundation.org
Subject: Re: [patch] x86: fix taking DNA during 64bit sigreturn

Andi Kleen wrote:
>> The *real* fix for this is almost certainly to just get rid of the 64-bit 
>> code entirely, and use the 32-bit code as the base for one single unified 
>> setup.
> 
> That would likely break the ABI. x86-64 ABI is completely different here --
> no ibcs, just pure x86 ISA.
> 

Different ABIs clearly have to be handled, but I don't think that is a 
huge deal.  The i387 code overall (not just asm/i387.h) is very 
different, though, and I find it unlikely that a properly unified code 
is going to be ready and working in the 2.6.24 timeframe.  I'm exploring 
if a partial merge with high confidence level is feasible; either way, a 
proper merge for 2.6.25 is probably the right thing.

	-hpa
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