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| author | Jeff Garzik <jgarzik@pobox.com> | 2005-11-18 11:42:40 -0500 |
|---|---|---|
| committer | Jeff Garzik <jgarzik@pobox.com> | 2005-11-18 11:42:40 -0500 |
| commit | 85a07029aaba8f5b27241bcff56cc009c9f4993b (patch) | |
| tree | c579554c2ea9c942ccbea60e223bc62d8262f652 /include/asm-s390/atomic.h | |
| parent | 0da36b3467040908d3df6bc1f5b4d592a8b23b63 (diff) | |
| parent | 79bfb0a98fdc73ed6a18469cef245cbf50a1d8bb (diff) | |
Merge branch 'upstream'
Diffstat (limited to 'include/asm-s390/atomic.h')
| -rw-r--r-- | include/asm-s390/atomic.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/include/asm-s390/atomic.h b/include/asm-s390/atomic.h index 9d86ba6f12d..b3bd4f679f7 100644 --- a/include/asm-s390/atomic.h +++ b/include/asm-s390/atomic.h @@ -198,6 +198,18 @@ atomic_compare_and_swap(int expected_oldval,int new_val,atomic_t *v) return retval; } +#define atomic_cmpxchg(v, o, n) (atomic_compare_and_swap((o), (n), &((v)->counter))) + +#define atomic_add_unless(v, a, u) \ +({ \ + int c, old; \ + c = atomic_read(v); \ + 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) + #define smp_mb__before_atomic_dec() smp_mb() #define smp_mb__after_atomic_dec() smp_mb() #define smp_mb__before_atomic_inc() smp_mb() |