linux-kernel - Re: [PATCH 07/12] x86-64: Simplify constraints for fxsave/fxtstor

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Date:	Thu, 09 Sep 2010 14:22:48 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Brian Gerst <brgerst@...il.com>
CC:	x86@...nel.org, linux-kernel@...r.kernel.org, penberg@...nel.org
Subject: Re: [PATCH 07/12] x86-64: Simplify constraints for fxsave/fxtstor

On 09/03/2010 06:17 PM, Brian Gerst wrote:
> Use the "R" constraint (legacy register) instead of listing all the
> possible registers.  Clean up the comments as well.
> 
> Signed-off-by: Brian Gerst <brgerst@...il.com>

Hi Brian,

Have you tested this on *old* versions of gcc?  Since the whole point of
that butt-ugly code sequence is to support now-historic versions of
binutils, we need to make sure that "R" was supposed on the
corresponding gcc versions...

	-hpa
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