[patch] powerpc: native atomic_add_unless

[Nick Piggin]

On Sat, Jan 21, 2006 at 12:25:36PM +0100, Nick Piggin wrote:
> Hi list,
> 
> atomic_add_unless (atomic_inc_not_zero) is used in several hot paths in the
> vfs and I'm planning some uses in the memory manager, so it should be as
> small and fast as possible.
> 
> Joel had a good suggestion to save a register but all bugs are mine.
> 
> Comments?
> 

Sorry, this probably doesn't compile without also the following patch
--

Index: linux-2.6/include/asm-powerpc/synch.h
===================================================================
--- linux-2.6.orig/include/asm-powerpc/synch.h
+++ linux-2.6/include/asm-powerpc/synch.h
@@ -15,7 +15,7 @@
 #endif
 
 #ifdef CONFIG_SMP
-#define ISYNC_ON_SMP	"\n\tisync"
+#define ISYNC_ON_SMP	"\n\tisync\n"
 #define LWSYNC_ON_SMP	__stringify(LWSYNC) "\n"
 #else
 #define ISYNC_ON_SMP