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author | Nick Piggin <nickpiggin@yahoo.com.au> | 2005-11-14 00:07:24 (GMT) |
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committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-11-14 02:14:16 (GMT) |
commit | 4a6dae6d382e9edf3ff440b819e554ed706359bc (patch) | |
tree | 2945a5095973e2ecf05b503d6deb859083045b8e /include/asm-h8300/atomic.h | |
parent | 53e86b91b7ae66d4c2757195cbd42e00d9199cf2 (diff) | |
download | linux-fsl-qoriq-4a6dae6d382e9edf3ff440b819e554ed706359bc.tar.xz |
[PATCH] atomic: cmpxchg
Introduce an atomic_cmpxchg operation.
Signed-off-by: Nick Piggin <npiggin@suse.de>
Cc: "Paul E. McKenney" <paulmck@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-h8300/atomic.h')
-rw-r--r-- | include/asm-h8300/atomic.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/include/asm-h8300/atomic.h b/include/asm-h8300/atomic.h index 7230f65..d504392 100644 --- a/include/asm-h8300/atomic.h +++ b/include/asm-h8300/atomic.h @@ -82,6 +82,19 @@ static __inline__ int atomic_dec_and_test(atomic_t *v) return ret == 0; } +static inline int atomic_cmpxchg(atomic_t *v, int old, int new) +{ + int ret; + unsigned long flags; + + local_irq_save(flags); + ret = v->counter; + if (likely(ret == old)) + v->counter = new; + local_irq_restore(flags); + return ret; +} + static __inline__ void atomic_clear_mask(unsigned long mask, unsigned long *v) { __asm__ __volatile__("stc ccr,r1l\n\t" |