linux-kernel - Re: [PATCH 2/6] include/linux/unaligned/{l,b}e_byteshift.h: Fix usage for compressed kernels

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Message-ID: <20090805092956.GD5854@laptop>
Date:	Wed, 5 Aug 2009 11:29:56 +0200
From:	Albin Tonnerre <albin.tonnerre@...e-electrons.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	sam@...nborg.org, hpa@...or.com, linux@....linux.org.uk,
	alain@...ff.lu, linux-kernel@...r.kernel.org,
	linux-embedded@...r.kernel.org
Subject: Re: [PATCH 2/6] include/linux/unaligned/{l,b}e_byteshift.h: Fix
 usage for compressed kernels

On Tue, Aug 04, 2009 at 03:55:50PM -0700, Andrew Morton wrote :
> On Mon,  3 Aug 2009 16:58:17 +0200
> Albin Tonnerre <albin.tonnerre@...e-electrons.com> wrote:

> > When unaligned accesses are required for uncompressing a kernel (such as
> > for LZO decompression on ARM in a patch that follows), including
> > <linux/kernel.h> causes issues as it brings in a lot of things that are
> > not available in the decompression environment.
> > However, those files apparently use nothing from <linux/kernel.h>, all
> > they need is the declaration of types such as u32 or u64, so
> > <linux/types.h> should be enough

> Again, please provide a full description of thes "issues" which a patch
> addresses so that the patch's importance can be understood by others,
> thanks.

linux/kernel.h brings at least:
extern int console_printk[];
extern const char hex_asc[];
which causes errors at link-time as they are not available when
compiling the pre-boot environement. There are also a few others:

arch/arm/boot/compressed/misc.o: In function `valid_user_regs':
/home/albin/devel/free-electrons/gits/linux-2.6/arch/arm/include/asm/ptrace.h:158: undefined reference to `elf_hwcap'
arch/arm/boot/compressed/misc.o: In function `console_silent':
/home/albin/devel/free-electrons/gits/linux-2.6/include/linux/kernel.h:292: undefined reference to `console_printk'
arch/arm/boot/compressed/misc.o: In function `console_verbose':
/home/albin/devel/free-electrons/gits/linux-2.6/include/linux/kernel.h:297: undefined reference to `console_printk'
arch/arm/boot/compressed/misc.o: In function `pack_hex_byte':
/home/albin/devel/free-electrons/gits/linux-2.6/include/linux/kernel.h:360: undefined reference to `hex_asc'
arch/arm/boot/compressed/misc.o: In function `hweight_long':
/home/albin/devel/free-electrons/gits/linux-2.6/include/linux/bitops.h:45: undefined reference to `hweight32'
arch/arm/boot/compressed/misc.o: In function `__cmpxchg_local_generic':
/home/albin/devel/free-electrons/gits/linux-2.6/include/asm-generic/cmpxchg-local.h:21: undefined reference to `wrong_size_cmpxchg'
/home/albin/devel/free-electrons/gits/linux-2.6/include/asm-generic/cmpxchg-local.h:42: undefined reference to `wrong_size_cmpxchg'
arch/arm/boot/compressed/misc.o: In function `__xchg':
/home/albin/devel/free-electrons/gits/linux-2.6/arch/arm/include/asm/system.h:309: undefined reference to `__bad_xchg'
make[2]: *** [arch/arm/boot/compressed/vmlinux] Error 1
make[1]: *** [arch/arm/boot/compressed/vmlinux] Error 2

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