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authorVineet Gupta <vgupta@synopsys.com>2015-07-29 19:20:58 +0530
committerVineet Gupta <vgupta@synopsys.com>2015-08-04 09:26:31 +0530
commitf5959cb0c34c5c7f9f387e5d8fe1ec831ccb42ac (patch)
tree646f0fc7d94072c3f974caa3b0b6033defc6bbe8 /arch/arc
parent6de7abfbad1c6a45893a47a17c2ac91b551aa90d (diff)
downloadlinux-f5959cb0c34c5c7f9f387e5d8fe1ec831ccb42ac.tar.bz2
Revert "ARCv2: STAR 9000837815 workaround hardware exclusive transactions livelock"
Extended testing of quad core configuration revealed that this fix was insufficient. Specifically LTP open posix shm_op/23-1 would cause the hardware livelock in llock/scond loop in update_cpu_load_active() So remove this and make way for a proper workaround This reverts commit a5c8b52abe677977883655166796f167ef1e0084. Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/arc')
-rw-r--r--arch/arc/include/asm/atomic.h14
1 files changed, 2 insertions, 12 deletions
diff --git a/arch/arc/include/asm/atomic.h b/arch/arc/include/asm/atomic.h
index 03484cb4d16d..20b7dc17979e 100644
--- a/arch/arc/include/asm/atomic.h
+++ b/arch/arc/include/asm/atomic.h
@@ -23,21 +23,13 @@
#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: \n" \
- PREFETCHW \
- " llock %0, [%1] \n" \
+ "1: llock %0, [%1] \n" \
" " #asm_op " %0, %0, %2 \n" \
" scond %0, [%1] \n" \
" bnz 1b \n" \
@@ -58,9 +50,7 @@ static inline int atomic_##op##_return(int i, atomic_t *v) \
smp_mb(); \
\
__asm__ __volatile__( \
- "1: \n" \
- PREFETCHW \
- " llock %0, [%1] \n" \
+ "1: llock %0, [%1] \n" \
" " #asm_op " %0, %0, %2 \n" \
" scond %0, [%1] \n" \
" bnz 1b \n" \