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

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Message-ID: <CA+5PVA50Bz2BtDw77yBvQpc9BxGZqyp0_4JeZUY-E_QB0mFZsA@mail.gmail.com>
Date:	Thu, 5 Apr 2012 16:27:26 -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 Tue, Apr 3, 2012 at 8:37 PM, Josh Boyer <jwboyer@...il.com> wrote:
> 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?

Er.. this patch seems to have been lost in limbo.  Is anyone following
up on it?

josh
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