diff options
| -rw-r--r-- | include/qemu/atomic.h | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/include/qemu/atomic.h b/include/qemu/atomic.h index 0aa8913301..492bce1c1b 100644 --- a/include/qemu/atomic.h +++ b/include/qemu/atomic.h @@ -168,14 +168,14 @@ #endif #ifndef atomic_xchg -#ifdef __ATOMIC_SEQ_CST +#if defined(__clang__) +#define atomic_xchg(ptr, i) __sync_swap(ptr, i) +#elif defined(__ATOMIC_SEQ_CST) #define atomic_xchg(ptr, i) ({ \ typeof(*ptr) _new = (i), _old; \ __atomic_exchange(ptr, &_new, &_old, __ATOMIC_SEQ_CST); \ _old; \ }) -#elif defined __clang__ -#define atomic_xchg(ptr, i) __sync_exchange(ptr, i) #else /* __sync_lock_test_and_set() is documented to be an acquire barrier only. */ #define atomic_xchg(ptr, i) (smp_mb(), __sync_lock_test_and_set(ptr, i)) |