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-rw-r--r--include/asm-xtensa/atomic.h19
1 files changed, 19 insertions, 0 deletions
diff --git a/include/asm-xtensa/atomic.h b/include/asm-xtensa/atomic.h
index cd40c5e75160..3670cc7695da 100644
--- a/include/asm-xtensa/atomic.h
+++ b/include/asm-xtensa/atomic.h
@@ -225,6 +225,25 @@ static inline int atomic_sub_return(int i, atomic_t * v)
225 225
226#define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n))) 226#define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
227 227
228/**
229 * atomic_add_unless - add unless the number is a given value
230 * @v: pointer of type atomic_t
231 * @a: the amount to add to v...
232 * @u: ...unless v is equal to u.
233 *
234 * Atomically adds @a to @v, so long as it was not @u.
235 * Returns non-zero if @v was not @u, and zero otherwise.
236 */
237#define atomic_add_unless(v, a, u) \
238({ \
239 int c, old; \
240 c = atomic_read(v); \
241 while (c != (u) && (old = atomic_cmpxchg((v), c, c + (a))) != c) \
242 c = old; \
243 c != (u); \
244})
245#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
246
228static inline void atomic_clear_mask(unsigned int mask, atomic_t *v) 247static inline void atomic_clear_mask(unsigned int mask, atomic_t *v)
229{ 248{
230 unsigned int all_f = -1; 249 unsigned int all_f = -1;