({ \
int c, old; \
c = atomic_read(v); \
- for (;;) { \
- if (unlikely(c == (u))) \
- break; \
- old = atomic_cmpxchg((v), c, c + (a)); \
- if (likely(old == c)) \
- break; \
+ while (c != (u) && (old = atomic_cmpxchg((v), c, c + (a))) != c) \
c = old; \
- } \
c != (u); \
})
#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)