Re: [PATCH] kernel/modsign_certificate.S: use real contents insteadof macro GLOBAL()

From: Josh Boyer
Date: Thu Oct 24 2013 - 11:29:44 EST

On Wed, Oct 23, 2013 at 10:31 PM, Chen Gang <gang.chen@xxxxxxxxxxx> 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@gchenlinux linux-next]# arc-elf32-as -v
> GNU assembler version 2.23.2 (arc-elf32) using BFD version (GNU Binutils) 2.23.2
> [root@gchenlinux linux-next]# arc-elf32-ld -v
> GNU ld (GNU Binutils) 2.23.2
> [root@gchenlinux 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

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

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