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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 /arch/sparc/lib
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 'arch/sparc/lib')
-rw-r--r--arch/sparc/lib/atomic32.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/sparc/lib/atomic32.c b/arch/sparc/lib/atomic32.c
index be46f6545184..cb3cf0f22822 100644
--- a/arch/sparc/lib/atomic32.c
+++ b/arch/sparc/lib/atomic32.c
@@ -53,6 +53,21 @@ int atomic_cmpxchg(atomic_t *v, int old, int new)
53 return ret; 53 return ret;
54} 54}
55 55
56int atomic_add_unless(atomic_t *v, int a, int u)
57{
58 int ret;
59 unsigned long flags;
60
61 spin_lock_irqsave(ATOMIC_HASH(v), flags);
62 ret = v->counter;
63 if (ret != u)
64 v->counter += a;
65 spin_unlock_irqrestore(ATOMIC_HASH(v), flags);
66 return ret != u;
67}
68
69static inline void atomic_clear_mask(unsigned long mask, unsigned long *addr)
70/* Atomic operations are already serializing */
56void atomic_set(atomic_t *v, int i) 71void atomic_set(atomic_t *v, int i)
57{ 72{
58 unsigned long flags; 73 unsigned long flags;