linux-kernel - [tip:x86/urgent] x86: Make smp

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Date:	Mon, 29 Mar 2010 18:42:37 GMT
From:	tip-bot for Yinghai Lu <yinghai@...nel.org>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	yinghai@...nel.org, torvalds@...ux-foundation.org,
	hannes@...xchg.org, davem@...emloft.net, benh@...nel.crashing.org,
	tglx@...utronix.de, mingo@...e.hu
Subject: [tip:x86/urgent] x86: Make smp_locks end with page alignment

Commit-ID:  596b711ed6b5235f8545680ef38ace00f9898c32
Gitweb:     http://git.kernel.org/tip/596b711ed6b5235f8545680ef38ace00f9898c32
Author:     Yinghai Lu <yinghai@...nel.org>
AuthorDate: Sun, 28 Mar 2010 19:42:54 -0700
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Mon, 29 Mar 2010 18:42:30 +0200

x86: Make smp_locks end with page alignment

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>
Acked-by: Johannes Weiner <hannes@...xchg.org>
Cc: David Miller <davem@...emloft.net>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
LKML-Reference: <1269830604-26214-2-git-send-email-yinghai@...nel.org>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 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
--
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