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

[H. Peter Anvin]

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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