linux-kernel - [PATCH 2/4] make initkmem_list3 non init data to fix modpost warning

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Message-ID: <20070108081104.GD7889@in.ibm.com>
Date:	Mon, 8 Jan 2007 13:41:04 +0530
From:	Vivek Goyal <vgoyal@...ibm.com>
To:	linux kernel mailing list <linux-kernel@...r.kernel.org>
Cc:	Fastboot mailing list <fastboot@...ts.osdl.org>,
	Morton Andrew Morton <akpm@...l.org>, Andi Kleen <ak@....de>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: [PATCH 2/4] make initkmem_list3 non init data to fix modpost warning




o MODPOST generates warning for i386 if kernel is compiled with
  CONFIG_RELOCATABLE=y

WARNING: vmlinux - Section mismatch: reference to .init.data:initkmem_list3 from .text between 'set_up_list3s' (at offset 0xc01536d9) and 's_start'

o I don't know the code well but looks like this is a bug.  initkmem_list3
  is of type __initdata, and it is accessed by non init functions.

	kmem_cache_create()
		setup_cpu_cache()
			set_up_list3s()
				{
					Accesses initkmem_list3[]
				}

o Somebody who knows this code well needs to review and ack.

Signed-off-by: Vivek Goyal <vgoyal@...ibm.com>
---

 mm/slab.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -puN mm/slab.c~make-initkmem_list3-non-init mm/slab.c
--- linux-2.6.20-rc2-mm1-reloc/mm/slab.c~make-initkmem_list3-non-init	2007-01-04 16:51:02.000000000 +0530
+++ linux-2.6.20-rc2-mm1-reloc-root/mm/slab.c	2007-01-04 16:51:02.000000000 +0530
@@ -305,7 +305,7 @@ struct kmem_list3 {
  * Need this for bootstrapping a per node allocator.
  */
 #define NUM_INIT_LISTS (2 * MAX_NUMNODES + 1)
-struct kmem_list3 __initdata initkmem_list3[NUM_INIT_LISTS];
+struct kmem_list3 initkmem_list3[NUM_INIT_LISTS];
 #define	CACHE_CACHE 0
 #define	SIZE_AC 1
 #define	SIZE_L3 (1 + MAX_NUMNODES)
_
-
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