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

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Date:	Tue, 29 May 2007 17:38:18 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	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

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?

> +#define m68k_fixup(type, addr)			\
> +	"	.section \".m68k_fixup\",\"aw\"\n"	\
> +	"	.long " #type "," #addr "\n"	\
> +	"	.previous\n"
> +
> +extern struct m68k_fixup_info __start_fixup[], __stop_fixup[];
> +
> +struct module;
> +extern void module_fixup(struct module *mod, struct m68k_fixup_info *start,
> +			 struct m68k_fixup_info *end);
-
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