linux-kernel - Re: [RFC] x86: xsave/xrstor support, ucontext

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Date:	Tue, 20 May 2008 10:57:04 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Mikael Pettersson <mikpe@...uu.se>
CC:	Andi Kleen <andi@...stfloor.org>,
	Suresh Siddha <suresh.b.siddha@...el.com>, mingo@...e.hu,
	tglx@...utronix.de, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, roland@...hat.com, drepper@...hat.com,
	Hongjiu.lu@...el.com, linux-kernel@...r.kernel.org,
	arjan@...ux.intel.com, rmk+lkml@....linux.org.uk, dan@...ian.org,
	asit.k.mallick@...el.com
Subject: Re: [RFC] x86: xsave/xrstor support, ucontext_t extensions

Mikael Pettersson wrote:
> 
> An ugly workaround could be to start clearing one of these fields,
> and say that the data there is only valid for kernels >= 2.6.26.
> (I said it was ugly...)
> 
> Or we go back to stashing a flag in uc_flags (which is kosher),
> and try to figure out how to mark non-rt sigframes.
> 

Or use the OSXSAVE hack.  Let me think about this for some time.

There is also the option of simply using a field guarded by a 64- or 
128-bit magic number.  It's a bit ugly, but it works.

	-hpa
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