linux-kernel - Re: [PATCH] kernel/modsign_certificate.S: use real contents instead of macro GLOBAL()

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Date:	Thu, 24 Oct 2013 08:29:37 -0700
From:	Josh Boyer <jwboyer@...oraproject.org>
To:	Chen Gang <gang.chen@...anux.com>
Cc:	Joern Rennecke <joern.rennecke@...ecosm.com>,
	James Hogan <james.hogan@...tec.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Takashi Iwai <tiwai@...e.de>,
	Vineet Gupta <Vineet.Gupta1@...opsys.com>,
	"jeremy.bennett@...ecosm.com" <jeremy.bennett@...ecosm.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Claudiu Zissulescu <Claudiu.Zissulescu@...opsys.com>,
	Francois Bedard <Francois.Bedard@...opsys.com>
Subject: Re: [PATCH] kernel/modsign_certificate.S: use real contents instead
 of macro GLOBAL()

On Wed, Oct 23, 2013 at 10:31 PM, Chen Gang <gang.chen@...anux.com> wrote:
> For some architectures, tool chain is not smart enough to recognize the
> macro with multiple lines (e.g. arc tool chain), and for common ".S"
> file, this kind of macro is also rarely used.
>
> So expand the related contents of macro to let it pass compiling (can
> use "arc-elf32-objdump -x" to know about it).
>
> The related error (allmodconfig for arc):
>
>     LD      init/built-in.o
>   kernel/built-in.o: In function `load_module_signing_keys':
>   kernel/modsign_pubkey.c:66: undefined reference to `modsign_certificate_list'
>   kernel/modsign_pubkey.c:71: undefined reference to `modsign_certificate_list_end'
>   kernel/modsign_pubkey.c:67: undefined reference to `modsign_certificate_list_end'
>
> The related tool chain information:
>
>   [root@...enlinux linux-next]# arc-elf32-as -v
>   GNU assembler version 2.23.2 (arc-elf32) using BFD version (GNU Binutils) 2.23.2
>   [root@...enlinux linux-next]# arc-elf32-ld -v
>   GNU ld (GNU Binutils) 2.23.2
>   [root@...enlinux linux-next]# arc-elf32-gcc -v
>   Using built-in specs.
>   COLLECT_GCC=arc-elf32-gcc
>   COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc/arc-elf32/4.8.0/lto-wrapper
>   Target: arc-elf32
>   Configured with: ../gcc/configure --without-header --disable-nls --enable-language=c --disable-threads --disable-shared --enable-werror=no target_configargs=enable_vtable_verify=yes --target=arc-elf32 --with-cpu=arc700 : (reconfigured) ../gcc/configure --disable-nls --enable-language=c --disable-threads --disable-shared --enable-werror=no target_configargs=enable_vtable_verify=yes --target=arc-elf32 --with-cpu=arc700 : (reconfigured) ../gcc/configure --without-header --disable-nls --enable-language=c --disable-threads --disable-shared --enable-werror=no target_configargs=enable_vtable_verify=yes --target=arc-elf32 --with-cpu=arc700 --disable-multilib --with-headers=../newlib/newlib/libc/include
>   Thread model: single
>   gcc version 4.8.0 (GCC)

Is this only an issue with using multi-line macro definitions in .S
files?  The practice of using multi-line macro definitions isn't rare.
 Look at e.g. include/linux/module.h, and a number of other header
files.

This seems like a toolchain bug that should be fixable if it works for
other architectures.

josh
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