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Diffstat (limited to 'arch/arm/include/asm/cmpxchg.h')
-rw-r--r--arch/arm/include/asm/cmpxchg.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/arm/include/asm/cmpxchg.h b/arch/arm/include/asm/cmpxchg.h
index df2fbba7efc8..abb2c3769b01 100644
--- a/arch/arm/include/asm/cmpxchg.h
+++ b/arch/arm/include/asm/cmpxchg.h
@@ -2,6 +2,7 @@
#define __ASM_ARM_CMPXCHG_H
#include <linux/irqflags.h>
+#include <linux/prefetch.h>
#include <asm/barrier.h>
#if defined(CONFIG_CPU_SA1100) || defined(CONFIG_CPU_SA110)
@@ -35,6 +36,7 @@ static inline unsigned long __xchg(unsigned long x, volatile void *ptr, int size
#endif
smp_mb();
+ prefetchw((const void *)ptr);
switch (size) {
#if __LINUX_ARM_ARCH__ >= 6
@@ -138,6 +140,8 @@ static inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old,
{
unsigned long oldval, res;
+ prefetchw((const void *)ptr);
+
switch (size) {
#ifndef CONFIG_CPU_V6 /* min ARCH >= ARMv6K */
case 1:
@@ -230,6 +234,8 @@ static inline unsigned long long __cmpxchg64(unsigned long long *ptr,
unsigned long long oldval;
unsigned long res;
+ prefetchw(ptr);
+
__asm__ __volatile__(
"1: ldrexd %1, %H1, [%3]\n"
" teq %1, %4\n"