linux-kernel - Re: [PATCH] Use correct byte-sized register constraint in __xchg

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Date:	Tue, 3 Apr 2012 20:37:23 -0400
From:	Josh Boyer <jwboyer@...il.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	"the arch/x86 maintainers" <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Thomas Reitmayr <treitmayr@...base.at>,
	leigh123linux@...glemail.com, Dave Jones <davej@...hat.com>
Subject: Re: [PATCH] Use correct byte-sized register constraint in __xchg_op()

On Mon, Apr 2, 2012 at 7:15 PM, Jeremy Fitzhardinge <jeremy@...p.org> wrote:
> x86-64 can access the low half of any register, but i386 can only do
> it with a subset of registers.  'r' causes compilation failures on i386,
> but 'q' expresses the constraint properly.
>
> Signed-off-by: Jeremy Fitzhardinge <jeremy@...p.org>
> Reported-by: Leigh Scott <leigh123linux@...glemail.com>
> Tested-by: Thomas Reitmayr <treitmayr@...base.at>

This should be CC'd to stable, given the bug shows up in 3.3, right?

josh
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