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| author | Jody McIntyre <scjody@modernduck.com> | 2005-11-18 08:18:25 +0300 |
|---|---|---|
| committer | Jody McIntyre <scjody@modernduck.com> | 2005-11-18 08:18:25 +0300 |
| commit | a9931a6e37c09f6b76a9fa0cbd777c335548692b (patch) | |
| tree | cd6ba9d36e350dd6188f7b8f95efc59c85d34485 /include/asm-s390/atomic.h | |
| parent | 7301c8d3a05dc52d33598364da7c4eb6ab6357eb (diff) | |
| parent | 811803c5572b296e0031e0099203de90d77c7bcf (diff) | |
| download | linux-a9931a6e37c09f6b76a9fa0cbd777c335548692b.tar.xz | |
Merge with http://kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
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 9d86ba6f12d0..b3bd4f679f72 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() |