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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 a5c8b52abe.

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
This commit is contained in:
Vineet Gupta 2015-07-29 19:20:58 +05:30
parent 6de7abfbad
commit f5959cb0c3
1 changed files with 2 additions and 12 deletions
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14
arch/arc/include/asm/atomic.h
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@ -23,21 +23,13 @@
#define atomic_set(v, i) (((v)->counter) = (i)) #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) \ #define ATOMIC_OP(op, c_op, asm_op) \
static inline void atomic_##op(int i, atomic_t *v) \ static inline void atomic_##op(int i, atomic_t *v) \
{ \ { \
unsigned int temp; \ unsigned int temp; \
\ \
__asm__ __volatile__( \ __asm__ __volatile__( \
"1: \n" \ "1: llock %0, [%1] \n" \
PREFETCHW \
" llock %0, [%1] \n" \
" " #asm_op " %0, %0, %2 \n" \ " " #asm_op " %0, %0, %2 \n" \
" scond %0, [%1] \n" \ " scond %0, [%1] \n" \
" bnz 1b \n" \ " bnz 1b \n" \
@ -58,9 +50,7 @@ static inline int atomic_##op##_return(int i, atomic_t *v) \
smp_mb(); \ smp_mb(); \
\ \
__asm__ __volatile__( \ __asm__ __volatile__( \
"1: \n" \ "1: llock %0, [%1] \n" \
PREFETCHW \
" llock %0, [%1] \n" \
" " #asm_op " %0, %0, %2 \n" \ " " #asm_op " %0, %0, %2 \n" \
" scond %0, [%1] \n" \ " scond %0, [%1] \n" \
" bnz 1b \n" \ " bnz 1b \n" \