linux-kernel - Re: modules: Fix build error in the !CONFIG

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Date:	Fri, 28 Aug 2009 17:24:26 +0800
From:	Amerigo Wang <xiyou.wangcong@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Helge Deller <deller@....de>
Subject: Re: modules: Fix build error in the !CONFIG_KALLSYMS case

On Fri, Aug 28, 2009 at 10:44:56AM +0200, Ingo Molnar wrote:
>
>* Linus Torvalds <torvalds@...ux-foundation.org> wrote:
>
>> James Bottomley (1):
>>       module: workaround duplicate section names
>
>-tip testing found that this patch breaks the build on x86 if 
>CONFIG_KALLSYMS is disabled:
>
> kernel/module.c: In function ‘load_module’:
> kernel/module.c:2367: error: ‘struct module’ has no member named ‘sect_attrs’
> distcc[8269] ERROR: compile kernel/module.c on ph/32 failed
> make[1]: *** [kernel/module.o] Error 1
> make: *** [kernel] Error 2
> make: *** Waiting for unfinished jobs....
>


Ouch..

>Commit 1b364bf misses the fact that section attributes are only 
>built and dealt with if kallsyms is enabled. The patch below fixes 
>this.
>
>( note, technically speaking this should depend on CONFIG_SYSFS as
>  well but this patch is correct too and keeps the #ifdef less
>  intrusive - in the KALLSYMS && !SYSFS case the code is a NOP. )
>
>Signed-off-by: Ingo Molnar <mingo@...e.hu>


I reviewed that patch. This one looks fine.

Reviewed-by: WANG Cong <xiyou.wangcong@...il.com>


Thanks!



>---
> kernel/module.c |    2 ++
> 1 files changed, 2 insertions(+), 0 deletions(-)
>
>diff --git a/kernel/module.c b/kernel/module.c
>index eccb561..b4016d1 100644
>--- a/kernel/module.c
>+++ b/kernel/module.c
>@@ -2355,8 +2355,10 @@ static noinline struct module *load_module(void __user *umod,
> 	if (err < 0)
> 		goto unlink;
> 	add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
>+#ifdef CONFIG_KALLSYMS
> 	if (mod->sect_attrs)
> 		add_notes_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
>+#endif
> 
> 	/* Get rid of temporary copy */
> 	vfree(hdr);
>--
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