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

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Message-ID: <20090806224055.GH31579@n2100.arm.linux.org.uk>
Date:	Thu, 6 Aug 2009 23:40:55 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Albin Tonnerre <albin.tonnerre@...e-electrons.com>
Cc:	sam@...nborg.org, hpa@...or.com, alain@...ff.lu,
	linux-kernel@...r.kernel.org, linux-embedded@...r.kernel.org,
	akpm@...ux-foundation.org
Subject: Re: [PATCH 4/6] Add support for LZO-compressed kernels for ARM

On Mon, Aug 03, 2009 at 04:58:19PM +0200, Albin Tonnerre wrote:
> This is the second part of patch. This part includes:
>  - changes to ach/arch/boot/Makefile to make it easier to add new
>    compression types
>  - new piggy.lzo.S necessary for lzo compression
>  - changes in arch/arm/boot/compressed/misc.c to allow the use of lzo or
>    gzip, depending on the config
>  - Kconfig support

FYI, with these patches applied and selecting GZIP method, I get
linker errors.  I've been unable to track down what's going on, but
it appears to be a libgcc issue.

In spite of the decompressor being built as an EABI object, gcc seems
to be issuing calls to __umodsi3, which isn't in the EABI libgcc
(they're called something different - don't ask.)

So I think these patches need further testing and evaluation on ARM
before they can be merged.  Moreover, I'd like to see some comparisons
between the _current_ gzip method, the new gzip method and the lzo
method on ARM.

I was going to get those numbers, but the platform I was going to run
the tests on has died on me today.
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