diff options
Diffstat (limited to 'include/asm-alpha')
-rw-r--r-- | include/asm-alpha/atomic.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/asm-alpha/atomic.h b/include/asm-alpha/atomic.h index a6660809a879..36505bb4e8cb 100644 --- a/include/asm-alpha/atomic.h +++ b/include/asm-alpha/atomic.h | |||
@@ -179,6 +179,16 @@ static __inline__ long atomic64_sub_return(long i, atomic64_t * v) | |||
179 | 179 | ||
180 | #define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n))) | 180 | #define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n))) |
181 | 181 | ||
182 | #define atomic_add_unless(v, a, u) \ | ||
183 | ({ \ | ||
184 | int c, old; \ | ||
185 | c = atomic_read(v); \ | ||
186 | while (c != (u) && (old = atomic_cmpxchg((v), c, c + (a))) != c) \ | ||
187 | c = old; \ | ||
188 | c != (u); \ | ||
189 | }) | ||
190 | #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) | ||
191 | |||
182 | #define atomic_dec_return(v) atomic_sub_return(1,(v)) | 192 | #define atomic_dec_return(v) atomic_sub_return(1,(v)) |
183 | #define atomic64_dec_return(v) atomic64_sub_return(1,(v)) | 193 | #define atomic64_dec_return(v) atomic64_sub_return(1,(v)) |
184 | 194 | ||