linux-kernel - [tip:x86/urgent] um, hweight: Fix UML boot crash due to x86 optimized hweight

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Date:	Thu, 10 Jun 2010 23:43:04 GMT
From:	tip-bot for Borislav Petkov <bp@...en8.de>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	tglx@...utronix.de, hpa@...ux.intel.com, bp@...en8.de
Subject: [tip:x86/urgent] um, hweight: Fix UML boot crash due to x86 optimized hweight

Commit-ID:  055c47272b8f5679d08ccc57efea3cb4aaeb5fc6
Gitweb:     http://git.kernel.org/tip/055c47272b8f5679d08ccc57efea3cb4aaeb5fc6
Author:     Borislav Petkov <bp@...en8.de>
AuthorDate: Wed, 9 Jun 2010 11:04:16 +0300
Committer:  H. Peter Anvin <hpa@...ux.intel.com>
CommitDate: Thu, 10 Jun 2010 15:24:30 -0700

um, hweight: Fix UML boot crash due to x86 optimized hweight

Apparently UML cannot stomach callee reg-saving trickery
introduced with d61931d89be506372d01a90d1755f6d0a9fafe2d
(x86: Add optimized popcnt variants) and oopses during boot:
http://marc.info/?l=linux-kernel&m=127522065202435&w=2

Redirect arch_hweight.h include from the x86 portion to the generic
arch_hweight.h which is a fallback to the software hweight routines.

LKML-Reference: <201005271944.09541.toralf.foerster@....de>
Signed-off-by: Borislav Petkov <bp@...en8.de>
LKML-Reference: <4C0F4B00.4090307@...asas.com>
Signed-off-by: H. Peter Anvin <hpa@...ux.intel.com>
---
 arch/um/include/asm/arch_hweight.h |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/arch/um/include/asm/arch_hweight.h b/arch/um/include/asm/arch_hweight.h
new file mode 100644
index 0000000..c656cf4
--- /dev/null
+++ b/arch/um/include/asm/arch_hweight.h
@@ -0,0 +1,6 @@
+#ifndef _ASM_UM_HWEIGHT_H
+#define _ASM_UM_HWEIGHT_H
+
+#include <asm-generic/bitops/arch_hweight.h>
+
+#endif
--
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