OMAP2/3 GPTIMER: allow system tick GPTIMER to be changed in board-*.c files

[linux-2.6-omap-h63xx.git] / arch / sparc / lib / atomic32.c

diff --git a/arch/sparc/lib/atomic32.c b/arch/sparc/lib/atomic32.c
index 559335f4917d1d1d03ee7ea28b9ff8e7d6948c6e..cbddeb38ffdab2bf5f25562190dd833bf2f9ded4 100644 (file)
--- a/arch/sparc/lib/atomic32.c
+++ b/arch/sparc/lib/atomic32.c
@@ -2,6 +2,7 @@
  * atomic32.c: 32-bit atomic_t implementation
  *
  * Copyright (C) 2004 Keith M Wesolowski
+ * Copyright (C) 2007 Kyle McMartin
  * 
  * Based on asm-parisc/atomic.h Copyright (C) 2000 Philipp Rumpf
  */
@@ -117,3 +118,17 @@ unsigned long ___change_bit(unsigned long *addr, unsigned long mask)
        return old & mask;
 }
 EXPORT_SYMBOL(___change_bit);
+
+unsigned long __cmpxchg_u32(volatile u32 *ptr, u32 old, u32 new)
+{
+       unsigned long flags;
+       u32 prev;
+
+       spin_lock_irqsave(ATOMIC_HASH(ptr), flags);
+       if ((prev = *ptr) == old)
+               *ptr = new;
+       spin_unlock_irqrestore(ATOMIC_HASH(ptr), flags);
+
+       return (unsigned long)prev;
+}
+EXPORT_SYMBOL(__cmpxchg_u32);