linux-kernel - [tip:x86/urgent] x86: Use u32 instead of long to set reset vector back to 0

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Date:	Mon, 28 Feb 2011 15:26:04 GMT
From:	tip-bot for Don Zickus <dzickus@...hat.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, mjg@...hat.com, hpa@...or.com,
	mingo@...hat.com, stable@...nel.org, tglx@...utronix.de,
	dzickus@...hat.com, mingo@...e.hu
Subject: [tip:x86/urgent] x86: Use u32 instead of long to set reset vector back to 0

Commit-ID:  299c56966a72b9109d47c71a6db52097098703dd
Gitweb:     http://git.kernel.org/tip/299c56966a72b9109d47c71a6db52097098703dd
Author:     Don Zickus <dzickus@...hat.com>
AuthorDate: Mon, 7 Feb 2011 23:25:00 -0500
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Mon, 28 Feb 2011 16:22:18 +0100

x86: Use u32 instead of long to set reset vector back to 0

A customer of ours, complained that when setting the reset
vector back to 0, it trashed other data and hung their box.
They noticed when only 4 bytes were set to 0 instead of 8,
everything worked correctly.

Mathew pointed out:

 |
 | We're supposed to be resetting trampoline_phys_low and
 | trampoline_phys_high here, which are two 16-bit values.
 | Writing 64 bits is definitely going to overwrite space
 | that we're not supposed to be touching.
 |

So limit the area modified to u32.

Signed-off-by: Don Zickus <dzickus@...hat.com>
Acked-by: Matthew Garrett <mjg@...hat.com>
Cc: <stable@...nel.org>
LKML-Reference: <1297139100-424-1-git-send-email-dzickus@...hat.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 arch/x86/include/asm/smpboot_hooks.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/include/asm/smpboot_hooks.h b/arch/x86/include/asm/smpboot_hooks.h
index 6c22bf3..725b778 100644
--- a/arch/x86/include/asm/smpboot_hooks.h
+++ b/arch/x86/include/asm/smpboot_hooks.h
@@ -34,7 +34,7 @@ static inline void smpboot_restore_warm_reset_vector(void)
 	 */
 	CMOS_WRITE(0, 0xf);
 
-	*((volatile long *)phys_to_virt(apic->trampoline_phys_low)) = 0;
+	*((volatile u32 *)phys_to_virt(apic->trampoline_phys_low)) = 0;
 }
 
 static inline void __init smpboot_setup_io_apic(void)
--
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