[patch 03/28] Add cmpxchg64 and cmpxchg64_local to alpha

[Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>]

Make sure that at least cmpxchg64_local is available on all architectures to use
for unsigned long long values.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
CC: rth@twiddle.net
CC: ink@jurassic.park.msu.ru
---
 include/asm-alpha/system.h |   15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

Index: linux-2.6-lttng/include/asm-alpha/system.h
===================================================================
--- linux-2.6-lttng.orig/include/asm-alpha/system.h	2007-10-31 17:32:44.000000000 -0400
+++ linux-2.6-lttng/include/asm-alpha/system.h	2007-10-31 17:52:23.000000000 -0400
@@ -681,13 +681,18 @@ __cmpxchg(volatile void *ptr, unsigned l
 	return old;
 }
 
-#define cmpxchg(ptr,o,n)						 \
+#define cmpxchg(ptr, o, n)						 \
   ({									 \
      __typeof__(*(ptr)) _o_ = (o);					 \
      __typeof__(*(ptr)) _n_ = (n);					 \
      (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_,		 \
 				    (unsigned long)_n_, sizeof(*(ptr))); \
   })
+#define cmpxchg64(ptr, o, n)						 \
+  ({									 \
+	BUILD_BUG_ON(sizeof(*(ptr)) != 8);				 \
+	cmpxchg((ptr), (o), (n));					 \
+  })
 
 static inline unsigned long
 __cmpxchg_u8_local(volatile char *m, long old, long new)
@@ -803,13 +808,19 @@ __cmpxchg_local(volatile void *ptr, unsi
 	return old;
 }
 
-#define cmpxchg_local(ptr,o,n)						 \
+#define cmpxchg_local(ptr, o, n)					 \
   ({									 \
      __typeof__(*(ptr)) _o_ = (o);					 \
      __typeof__(*(ptr)) _n_ = (n);					 \
      (__typeof__(*(ptr))) __cmpxchg_local((ptr), (unsigned long)_o_,	 \
 				    (unsigned long)_n_, sizeof(*(ptr))); \
   })
+#define cmpxchg64_local(ptr, o, n)					 \
+  ({									 \
+	BUILD_BUG_ON(sizeof(*(ptr)) != 8);				 \
+	cmpxchg_local((ptr), (o), (n));					 \
+  })
+
 
 #endif /* __ASSEMBLY__ */
 

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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