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authorDavid S. Miller <davem@davemloft.net>2012-11-10 07:37:59 +0400
committerDavid S. Miller <davem@davemloft.net>2012-11-10 07:37:59 +0400
commit193d2aadc0ff5c687f6f0d5ef1d38c86ab511a14 (patch)
tree294286e259a08c977e3e71819b2c1d763b13312f /arch/sparc/include/asm/atomic_64.h
parent0bce04be442cf4d6e4ba9dac2f0a4c5ee88af5c5 (diff)
downloadlinux-193d2aadc0ff5c687f6f0d5ef1d38c86ab511a14.tar.xz
sparc: Support atomic64_dec_if_positive properly.
Sparc32 already supported it, as a consequence of using the generic atomic64 implementation. And the sparc64 implementation is rather trivial. This allows us to set ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE for all of sparc, and avoid the annoying warning from lib/atomic64_test.c Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc/include/asm/atomic_64.h')
-rw-r--r--arch/sparc/include/asm/atomic_64.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/sparc/include/asm/atomic_64.h b/arch/sparc/include/asm/atomic_64.h
index ce35a1cf1a20..be56a244c9cf 100644
--- a/arch/sparc/include/asm/atomic_64.h
+++ b/arch/sparc/include/asm/atomic_64.h
@@ -1,7 +1,7 @@
/* atomic.h: Thankfully the V9 is at least reasonable for this
* stuff.
*
- * Copyright (C) 1996, 1997, 2000 David S. Miller (davem@redhat.com)
+ * Copyright (C) 1996, 1997, 2000, 2012 David S. Miller (davem@redhat.com)
*/
#ifndef __ARCH_SPARC64_ATOMIC__
@@ -106,6 +106,8 @@ static inline long atomic64_add_unless(atomic64_t *v, long a, long u)
#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)
+extern long atomic64_dec_if_positive(atomic64_t *v);
+
/* Atomic operations are already serializing */
#define smp_mb__before_atomic_dec() barrier()
#define smp_mb__after_atomic_dec() barrier()