linux-kernel - Re: [patch 1/2] m68k: runtime patching infrastructure

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Message-ID: <465D1020.3030605@cosmosbay.com>
Date:	Wed, 30 May 2007 07:48:16 +0200
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-m68k@...r.kernel.org,
	Roman Zippel <zippel@...ux-m68k.org>
Subject: Re: [patch 1/2] m68k: runtime patching infrastructure

Andrew Morton a écrit :
> On Mon, 28 May 2007 21:16:31 +0200
> Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> 
>> --- a/include/asm-m68k/module.h
>> +++ b/include/asm-m68k/module.h
>> @@ -1,7 +1,38 @@
>>  #ifndef _ASM_M68K_MODULE_H
>>  #define _ASM_M68K_MODULE_H
>> -struct mod_arch_specific { };
>> +
>> +struct mod_arch_specific {
>> +	struct m68k_fixup_info *fixup_start, *fixup_end;
>> +};
> 
> Here we use struct m68k_fixup_info.
> 
>> +#define MODULE_ARCH_INIT {				\
>> +	.fixup_start		= __start_fixup,	\
>> +	.fixup_end		= __stop_fixup,		\
>> +}
>> +
>>  #define Elf_Shdr Elf32_Shdr
>>  #define Elf_Sym Elf32_Sym
>>  #define Elf_Ehdr Elf32_Ehdr
>> +
>> +
>> +enum m68k_fixup_type {
>> +	m68k_fixup_memoffset,
>> +};
>> +
>> +struct m68k_fixup_info {
>> +	enum m68k_fixup_type type;
>> +	void *addr;
>> +};
> 
> and later we define it.
> 
> How come it doesn't spit warnings?
> 
> I think it could be tightened up even if it happens not to warn?


struct a {
	struct not_yet_defined *start, *end;
};

struct not_yet_defined {
	void *foo;
};

Is a valid and gives no warnings.

Still I didnt tried to compile a m68k kernel, so I guess I shouldnt speak here :)
-
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