linux-kernel - [PATCH 01/24] x86: Make smp_locks end with page alignment

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Date:	Fri, 26 Mar 2010 15:21:31 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Miller <davem@...emloft.net>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Johannes Weiner <hannes@...xchg.org>, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org, Yinghai Lu <yinghai@...nel.org>
Subject: [PATCH 01/24] x86: Make smp_locks end with page alignment

Try to fix
------------[ cut here ]------------
WARNING: at arch/x86/mm/init.c:342 free_init_pages+0x4c/0xfa()
free_init_pages: range [0x40daf000, 0x40db5c24] is not aligned
Modules linked in:
Pid: 0, comm: swapper Not tainted 2.6.34-rc2-tip-03946-g4f16b23-dirty #50
Call Trace:
 [<40232e9f>] warn_slowpath_common+0x65/0x7c
 [<4021c9f0>] ? free_init_pages+0x4c/0xfa
 [<40881434>] ? _etext+0x0/0x24
 [<40232eea>] warn_slowpath_fmt+0x24/0x27
 [<4021c9f0>] free_init_pages+0x4c/0xfa
 [<40881434>] ? _etext+0x0/0x24
 [<40d3f4bd>] alternative_instructions+0xf6/0x100
 [<40d3fe4f>] check_bugs+0xbd/0xbf
 [<40d398a7>] start_kernel+0x2d5/0x2e4
 [<40d390ce>] i386_start_kernel+0xce/0xd5
---[ end trace 4eaa2a86a8e2da22 ]---

Comments in vmlinux.lds.S already said:
|        /*
|         * smp_locks might be freed after init
|         * start/end must be page aligned
|         */

Signed-off-by: Yinghai Lu <yinghai@...nel.org>
---
 arch/x86/kernel/vmlinux.lds.S |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
index 44879df..2cc2497 100644
--- a/arch/x86/kernel/vmlinux.lds.S
+++ b/arch/x86/kernel/vmlinux.lds.S
@@ -291,8 +291,8 @@ SECTIONS
 	.smp_locks : AT(ADDR(.smp_locks) - LOAD_OFFSET) {
 		__smp_locks = .;
 		*(.smp_locks)
-		__smp_locks_end = .;
 		. = ALIGN(PAGE_SIZE);
+		__smp_locks_end = .;
 	}
 
 #ifdef CONFIG_X86_64
-- 
1.6.4.2

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