diff options
| -rw-r--r-- | arch/s390/include/asm/atomic_ops.h | 36 |
1 files changed, 30 insertions, 6 deletions
diff --git a/arch/s390/include/asm/atomic_ops.h b/arch/s390/include/asm/atomic_ops.h index 92ea9d9a2b93..2e818f2709bf 100644 --- a/arch/s390/include/asm/atomic_ops.h +++ b/arch/s390/include/asm/atomic_ops.h @@ -156,22 +156,46 @@ __ATOMIC64_OPS(__atomic64_xor, "xgr") static inline int __atomic_cmpxchg(int *ptr, int old, int new) { - return __sync_val_compare_and_swap(ptr, old, new); + asm volatile( + " cs %[old],%[new],%[ptr]" + : [old] "+d" (old), [ptr] "+Q" (*ptr) + : [new] "d" (new) + : "cc", "memory"); + return old; } -static inline int __atomic_cmpxchg_bool(int *ptr, int old, int new) +static inline bool __atomic_cmpxchg_bool(int *ptr, int old, int new) { - return __sync_bool_compare_and_swap(ptr, old, new); + int old_expected = old; + + asm volatile( + " cs %[old],%[new],%[ptr]" + : [old] "+d" (old), [ptr] "+Q" (*ptr) + : [new] "d" (new) + : "cc", "memory"); + return old == old_expected; } static inline long __atomic64_cmpxchg(long *ptr, long old, long new) { - return __sync_val_compare_and_swap(ptr, old, new); + asm volatile( + " csg %[old],%[new],%[ptr]" + : [old] "+d" (old), [ptr] "+S" (*ptr) + : [new] "d" (new) + : "cc", "memory"); + return old; } -static inline long __atomic64_cmpxchg_bool(long *ptr, long old, long new) +static inline bool __atomic64_cmpxchg_bool(long *ptr, long old, long new) { - return __sync_bool_compare_and_swap(ptr, old, new); + long old_expected = old; + + asm volatile( + " csg %[old],%[new],%[ptr]" + : [old] "+d" (old), [ptr] "+S" (*ptr) + : [new] "d" (new) + : "cc", "memory"); + return old == old_expected; } #endif /* __ARCH_S390_ATOMIC_OPS__ */ |