linux-kernel - Re: [PATCH 4/6] Add support for LZO-compressed kernels for ARM

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Message-ID: <20090813093036.GG4051@pc-ras4041.res.insa>
Date:	Thu, 13 Aug 2009 11:30:36 +0200
From:	Albin Tonnerre <albin.tonnerre@...e-electrons.com>
To:	"H. Peter Anvin" <hpa@...or.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Sam Ravnborg <sam@...nborg.org>,
	Matthieu CASTET <matthieu.castet@...rot.com>,
	Alain Knaff <alain@...ff.lu>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-embedded@...r.kernel.org" <linux-embedded@...r.kernel.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
Subject: Re: [PATCH 4/6] Add support for LZO-compressed kernels for ARM

On Tue, Aug 11, 2009 at 09:31:25AM -0700, H. Peter Anvin wrote :
> On 08/11/2009 09:27 AM, Albin Tonnerre wrote:
> > 
> > So I guess the only options left are either define a dummy raise() function, or
> > get rid of the divisions like Alain Knaff did in his patch ?
> > 
> 
> Define a dummy raise, get rid of the divisions, or provide your own
> division function (there is probably one in the kernel already...)

Yes, there's such a function in arch/arm/lib/lib1funcs.S, which in turns
requires the __div0 symbol, defined in arch/arm/kernel/traps.c, and this one
cannot be used as it brings plenty of symbols that aren't available in the
pre-boot environment. So anyway, we have to define our own symbols there. Either
we use libgcc and define raise(), or lib1funcs and define __div0().

Russell, what's your take on this ?

Regards,
-- 
Albin Tonnerre, Free Electrons
Kernel, drivers and embedded Linux development,
consulting, training and support.
http://free-electrons.com
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