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

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Message-ID: <4A841E04.8070108@zytor.com>
Date:	Thu, 13 Aug 2009 07:07:00 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Albin Tonnerre <albin.tonnerre@...e-electrons.com>
CC:	Russell King - ARM Linux <linux@....linux.org.uk>,
	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 08/13/2009 02:30 AM, Albin Tonnerre wrote:
> 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().
> 

I would go with the variant in the kernel, as being a known quantity.

Your __div0 function can just loop forever.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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