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sparc: Support atomic64_dec_if_positive properly.

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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>
This commit is contained in:
David S. Miller
2012-11-09 19:37:59 -08:00
parent 0bce04be44
commit 193d2aadc0
4 changed files with 20 additions and 2 deletions
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4
arch/sparc/include/asm/atomic_64.h
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@@ -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()