linux-kernel - [PATCH resend] um, hweight: Fix UML boot crash

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Message-ID: <4C0F4B00.4090307@panasas.com>
Date:	Wed, 09 Jun 2010 11:04:16 +0300
From:	Boaz Harrosh <bharrosh@...asas.com>
To:	Borislav Petkov <bp@...en8.de>, "H. Peter Anvin" <hpa@...or.com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Toralf Förster <toralf.foerster@....de>,
	uml-devel <user-mode-linux-devel@...ts.sourceforge.net>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: [PATCH resend] um, hweight: Fix UML boot crash

From: Borislav Petkov <bp@...en8.de>

Obviously 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>
---
 arch/um/include/asm/arch_hweight.h |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
 create mode 100644 arch/um/include/asm/arch_hweight.h

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
-- 1.7.1 
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