linux-kernel - Re: [PATCH] module: Fix up CONFIG

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Message-ID: <2375c9f90909242349u7daa7b1epae52fb0da6c92b7d@mail.gmail.com>
Date:	Fri, 25 Sep 2009 14:49:22 +0800
From:	Américo Wang <xiyou.wangcong@...il.com>
To:	Paul Mundt <lethal@...ux-sh.org>,
	Jan Beulich <jbeulich@...ell.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] module: Fix up CONFIG_KALLSYMS=n build.

On Fri, Sep 25, 2009 at 11:45 AM, Paul Mundt <lethal@...ux-sh.org> wrote:
> Starting from commit 4a4962263f07d14660849ec134ee42b63e95ea9a
> "reduce symbol table for loaded modules (v2)", the kernel/module.c build
> is broken with CONFIG_KALLSYMS disabled.
>
>  CC      kernel/module.o
> kernel/module.c:1995: warning: type defaults to 'int' in declaration of 'Elf_Hdr'
> kernel/module.c:1995: error: expected ';', ',' or ')' before '*' token
> kernel/module.c: In function 'load_module':
> kernel/module.c:2203: error: 'strmap' undeclared (first use in this function)
> kernel/module.c:2203: error: (Each undeclared identifier is reported only once
> kernel/module.c:2203: error: for each function it appears in.)
> kernel/module.c:2239: error: 'symoffs' undeclared (first use in this function)
> kernel/module.c:2239: error: implicit declaration of function 'layout_symtab'
> kernel/module.c:2240: error: 'stroffs' undeclared (first use in this function)
> make[1]: *** [kernel/module.o] Error 1
> make: *** [kernel/module.o] Error 2
>
> There are three different issues:
>
>    - layout_symtab() takes a const Elf_Ehdr
>
>    - layout_symtab() needs to return a value
>
>    - symoffs/stroffs/strmap are referenced by the load_module() code
>      despite being ifdefed out, which seems unnecessary given the noop
>      behaviour of layout_symtab()/add_kallsyms() in the case of
>      CONFIG_KALLSYMS=n.
>
> Signed-off-by: Paul Mundt <lethal@...ux-sh.org>
> Cc: Jan Beulich <jbeulich@...ell.com>
> Cc: Rusty Russell <rusty@...tcorp.com.au>

Indeed.

Acked-by: WANG Cong <amwang@...hat.com>
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