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

Mathieu Desnoyers
2007-10-31T22:42:49Z

[-- Attachment #1: add-cmpxchg64-to-alpha.patch --]
[-- Type: text/plain, Size: 1969 bytes --]

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__ */