Cc: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Signed-off-by: Vineet Gupta <vgupta@xxxxxxxxxxxx>
---
arch/arc/include/asm/atomic.h | 14 ++++++++++++--
1 file changed, 12 insertions(+), 2 deletions(-)
diff --git a/arch/arc/include/asm/atomic.h b/arch/arc/include/asm/atomic.h
index 6fc968f78500..abaf222665e6 100644
--- a/arch/arc/include/asm/atomic.h
+++ b/arch/arc/include/asm/atomic.h
@@ -23,13 +23,21 @@
#define atomic_set(v, i) (((v)->counter) = (i))
+#ifdef CONFIG_ISA_ARCV2
+#define PREFETCHW " prefetchw [%1] \n"
+#else
+#define PREFETCHW
+#endif
+
#define ATOMIC_OP(op, c_op, asm_op) \
static inline void atomic_##op(int i, atomic_t *v) \
{ \
unsigned int temp; \
\
__asm__ __volatile__( \
- "1: llock %0, [%1] \n" \
+ "1: \n" \
+ PREFETCHW \
+ " llock %0, [%1] \n" \
" " #asm_op " %0, %0, %2 \n" \
" scond %0, [%1] \n" \
" bnz 1b \n" \
@@ -46,7 +54,9 @@ static inline int atomic_##op##_return(int i, atomic_t *v) \
smp_mb(); \
\
__asm__ __volatile__( \
- "1: llock %0, [%1] \n" \
+ "1: \n" \
+ PREFETCHW \
+ " llock %0, [%1] \n" \
" " #asm_op " %0, %0, %2 \n" \
" scond %0, [%1] \n" \
" bnz 1b \n" \
--
1.9.1
--
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