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Koen Kooi
56e60917b2
Signed-off-by: Koen Kooi <koen@dominion.thruhere.net> Signed-off-by: Denys Dmytriyenko <denys@ti.com> Signed-off-by: Denys Dmytriyenko <denis@denix.org>
35 lines
1.2 KiB
Diff
35 lines
1.2 KiB
Diff
From 3fed281f20c3b2cdfe1a1f087973b0c0e3b4cd05 Mon Sep 17 00:00:00 2001
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From: Tiejun Chen <tiejun.chen@windriver.com>
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Date: Wed, 11 Jul 2012 14:22:46 +1000
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Subject: [PATCH 36/73] powerpc: Add "memory" attribute for mfmsr()
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commit b416c9a10baae6a177b4f9ee858b8d309542fbef upstream.
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Add "memory" attribute in inline assembly language as a compiler
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barrier to make sure 4.6.x GCC don't reorder mfmsr().
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Signed-off-by: Tiejun Chen <tiejun.chen@windriver.com>
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Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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---
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arch/powerpc/include/asm/reg.h | 3 ++-
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1 files changed, 2 insertions(+), 1 deletions(-)
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diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h
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index 559da19..578e5a0 100644
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--- a/arch/powerpc/include/asm/reg.h
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+++ b/arch/powerpc/include/asm/reg.h
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@@ -1016,7 +1016,8 @@
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/* Macros for setting and retrieving special purpose registers */
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#ifndef __ASSEMBLY__
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#define mfmsr() ({unsigned long rval; \
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- asm volatile("mfmsr %0" : "=r" (rval)); rval;})
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+ asm volatile("mfmsr %0" : "=r" (rval) : \
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+ : "memory"); rval;})
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#ifdef CONFIG_PPC_BOOK3S_64
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#define __mtmsrd(v, l) asm volatile("mtmsrd %0," __stringify(l) \
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: : "r" (v) : "memory")
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--
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1.7.7.6
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