This is a note to let you know that I've just added the patch titled
powerpc: Add "memory" attribute for mfmsr()
to the 3.5-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
powerpc-add-memory-attribute-for-mfmsr.patch
and it can be found in the queue-3.5 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From b416c9a10baae6a177b4f9ee858b8d309542fbef Mon Sep 17 00:00:00 2001
From: Tiejun Chen <[email protected]>
Date: Wed, 11 Jul 2012 14:22:46 +1000
Subject: powerpc: Add "memory" attribute for mfmsr()
From: Tiejun Chen <[email protected]>
commit b416c9a10baae6a177b4f9ee858b8d309542fbef upstream.
Add "memory" attribute in inline assembly language as a compiler
barrier to make sure 4.6.x GCC don't reorder mfmsr().
Signed-off-by: Tiejun Chen <[email protected]>
Signed-off-by: Benjamin Herrenschmidt <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
arch/powerpc/include/asm/reg.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/arch/powerpc/include/asm/reg.h
+++ b/arch/powerpc/include/asm/reg.h
@@ -1024,7 +1024,8 @@
/* Macros for setting and retrieving special purpose registers */
#ifndef __ASSEMBLY__
#define mfmsr() ({unsigned long rval; \
- asm volatile("mfmsr %0" : "=r" (rval)); rval;})
+ asm volatile("mfmsr %0" : "=r" (rval) : \
+ : "memory"); rval;})
#ifdef CONFIG_PPC_BOOK3S_64
#define __mtmsrd(v, l) asm volatile("mtmsrd %0," __stringify(l) \
: : "r" (v) : "memory")
Patches currently in stable-queue which might be from [email protected]
are
queue-3.5/powerpc-add-memory-attribute-for-mfmsr.patch
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