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authorNick Piggin <nickpiggin@yahoo.com.au>2005-11-13 19:07:25 -0500
committerLinus Torvalds <torvalds@g5.osdl.org>2005-11-13 21:14:16 -0500
commit8426e1f6af0fd7f44d040af7263750c5a52f3cc3 (patch)
tree827bd2588c2b73d11cea6869de8ff42dba134375 /include/asm-sh64/atomic.h
parent4a6dae6d382e9edf3ff440b819e554ed706359bc (diff)
[PATCH] atomic: inc_not_zero
Introduce an atomic_inc_not_zero operation. Make this a special case of atomic_add_unless because lockless pagecache actually wants atomic_inc_not_negativeone due to its offset refcount. 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-sh64/atomic.h')
-rw-r--r--include/asm-sh64/atomic.h15
1 files changed, 15 insertions, 0 deletions
diff --git a/include/asm-sh64/atomic.h b/include/asm-sh64/atomic.h
index 6eeb57b015ce..927a2bc27b30 100644
--- a/include/asm-sh64/atomic.h
+++ b/include/asm-sh64/atomic.h
@@ -113,6 +113,21 @@ static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
113 return ret; 113 return ret;
114} 114}
115 115
116static inline int atomic_add_unless(atomic_t *v, int a, int u)
117{
118 int ret;
119 unsigned long flags;
120
121 local_irq_save(flags);
122 ret = v->counter;
123 if (ret != u)
124 v->counter += a;
125 local_irq_restore(flags);
126
127 return ret != u;
128}
129#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
130
116static __inline__ void atomic_clear_mask(unsigned int mask, atomic_t *v) 131static __inline__ void atomic_clear_mask(unsigned int mask, atomic_t *v)
117{ 132{
118 unsigned long flags; 133 unsigned long flags;