From 4a6dae6d382e9edf3ff440b819e554ed706359bc Mon Sep 17 00:00:00 2001
From: Nick Piggin <nickpiggin@yahoo.com.au>
Date: Sun, 13 Nov 2005 16:07:24 -0800
Subject: [PATCH] atomic: cmpxchg

Introduce an atomic_cmpxchg operation.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Cc: "Paul E. McKenney" <paulmck@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---
 include/asm-s390/atomic.h | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'include/asm-s390')

diff --git a/include/asm-s390/atomic.h b/include/asm-s390/atomic.h
index 9d86ba6f12d..631014d5de9 100644
--- a/include/asm-s390/atomic.h
+++ b/include/asm-s390/atomic.h
@@ -198,6 +198,8 @@ atomic_compare_and_swap(int expected_oldval,int new_val,atomic_t *v)
         return retval;
 }
 
+#define atomic_cmpxchg(v, o, n) (atomic_compare_and_swap((o), (n), &((v)->counter)))
+
 #define smp_mb__before_atomic_dec()	smp_mb()
 #define smp_mb__after_atomic_dec()	smp_mb()
 #define smp_mb__before_atomic_inc()	smp_mb()
-- 
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