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authorKyle McMartin <kyle@parisc-linux.org>2007-05-29 05:51:13 -0400
committerDavid S. Miller <davem@davemloft.net>2007-05-29 05:51:13 -0400
commit6197fe4d720ea3e2ee94cdc7ef32d6c0151199de (patch)
treec521b677a8ca7ab24f12c0e8275a3cbdd00131c0 /arch/sparc/lib
parent679292993c77c06f7ade4e317c13256b92c2651b (diff)
[SPARC]: Emulate cmpxchg like parisc
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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 559335f4917d..617d29832e19 100644
--- a/arch/sparc/lib/atomic32.c
+++ b/arch/sparc/lib/atomic32.c
@@ -2,6 +2,7 @@
2 * atomic32.c: 32-bit atomic_t implementation 2 * atomic32.c: 32-bit atomic_t implementation
3 * 3 *
4 * Copyright (C) 2004 Keith M Wesolowski 4 * Copyright (C) 2004 Keith M Wesolowski
5 * Copyright (C) 2007 Kyle McMartin
5 * 6 *
6 * Based on asm-parisc/atomic.h Copyright (C) 2000 Philipp Rumpf 7 * Based on asm-parisc/atomic.h Copyright (C) 2000 Philipp Rumpf
7 */ 8 */
@@ -117,3 +118,17 @@ unsigned long ___change_bit(unsigned long *addr, unsigned long mask)
117 return old & mask; 118 return old & mask;
118} 119}
119EXPORT_SYMBOL(___change_bit); 120EXPORT_SYMBOL(___change_bit);
121
122unsigned long __cmpxchg_u32(volatile u32 *ptr, u32 old, u32 new)
123{
124 unsigned long flags;
125 u32 prev;
126
127 spin_lock_irqsave(ATOMIC_HASH(addr), flags);
128 if ((prev = *ptr) == old)
129 *ptr = new;
130 spin_unlock_irqrestore(ATOMIC_HASH(addr), flags);
131
132 return (unsigned long)prev;
133}
134EXPORT_SYMBOL(__cmpxchg_u32);