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

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Message-ID: <20090828084456.GB3454@elte.hu>
Date:	Fri, 28 Aug 2009 10:44:56 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	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: modules: Fix build error in the !CONFIG_KALLSYMS case

* 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....

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>
---
 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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