linux-kernel - Re: [PATCH v2] MTD: Fix Orion NAND driver compilation with ARM OABI

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Date:	Fri, 23 Apr 2010 13:50:10 -0400 (EDT)
From:	Nicolas Pitre <nico@...xnic.net>
To:	Artem Bityutskiy <dedekind1@...il.com>
Cc:	Paulius Zaleckas <paulius.zaleckas@...il.com>, dwmw2@...radead.org,
	jamie@...reable.org, linux-kernel@...r.kernel.org,
	linux-mtd@...ts.infradead.org, u.kleine-koenig@...gutronix.de,
	simon.kagstrom@...insight.net, akpm@...ux-foundation.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2] MTD: Fix Orion NAND driver compilation with ARM OABI

On Fri, 23 Apr 2010, Artem Bityutskiy wrote:

> On Fri, 2010-04-23 at 08:54 -0400, Nicolas Pitre wrote:
> > On Fri, 23 Apr 2010, Artem Bityutskiy wrote:
> > 
> > > On Wed, 2010-03-31 at 15:01 +0300, Paulius Zaleckas wrote:
> > > > On 03/25/2010 06:26 PM, Nicolas Pitre wrote:
> > > > > On Thu, 25 Mar 2010, Paulius Zaleckas wrote:
> > > > >
> > > > >> We must tell GCC to use even register for variable passed
> > > > >> to ldrd instruction. Without this patch GCC 4.2.1 puts this
> > > > >> variable to r2/r3 on EABI and r3/r4 on OABI, so force it to
> > > > >> r2/r3. This does not change anything when EABI and OABI
> > > > >> compilation works OK.
> > > > >>
> > > > >> Without this patch and with OABI I get:
> > > > >>    CC      drivers/mtd/nand/orion_nand.o
> > > > >> /tmp/ccMkwOCs.s: Assembler messages:
> > > > >> /tmp/ccMkwOCs.s:63: Error: first destination register must be even -- `ldrd r3,[ip]'
> > > > >> make[5]: *** [drivers/mtd/nand/orion_nand.o] Error 1
> > > > >>
> > > > >> Signed-off-by: Paulius Zaleckas<paulius.zaleckas@...il.com>
> > > > >
> > > > > Acked-by: Nicolas Pitre<nico@...xnic.net>
> > > > 
> > > > David,
> > > > 
> > > > Will you take this patch?
> > > > Or you are waiting till I will add all Cc as Jamie suggested?
> > > 
> > > Meanwhile, I've pushed your patch to my l2-mtd-2.6.git / dunno.
> > 
> > I think it should go to mainline.  It is not perfect, but still better 
> > than the current situation.
> 
> Fine with me, but not up to me. But I guess Andrew could merge it.

The patch is providing a fix to my own code, and I acked it already. The 
root of the problem is a defficiency in gcc, and dwmw2 asked that a PR 
be filled for that and a reference to it added to the patch.  This has 
been done.


Nicolas
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