Add cmpxchg64 and cmpxchg64_local to powerpc

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>
Acked-by: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 16 insertions, 2 deletions

diff --git a/include/asm-powerpc/system.h b/include/asm-powerpc/system.h
index bc9739dff5e7..2a65ae637204 100644
--- a/include/asm-powerpc/system.h
+++ b/include/asm-powerpc/system.h
@@ -463,7 +463,7 @@ __cmpxchg_local(volatile void *ptr, unsigned long old, unsigned long new,
         return old;
 }
 
-#define cmpxchg(ptr,o,n)                                                 \
+#define cmpxchg(ptr, o, n)                                               \
   ({                                                                     \
      __typeof__(*(ptr)) _o_ = (o);                                       \
      __typeof__(*(ptr)) _n_ = (n);                                       \
@@ -472,7 +472,7 @@ __cmpxchg_local(volatile void *ptr, unsigned long old, unsigned long new,
   })
 
 
-#define cmpxchg_local(ptr,o,n)                                           \
+#define cmpxchg_local(ptr, o, n)                                         \
   ({                                                                     \
      __typeof__(*(ptr)) _o_ = (o);                                       \
      __typeof__(*(ptr)) _n_ = (n);                                       \
@@ -492,6 +492,20 @@ __cmpxchg_local(volatile void *ptr, unsigned long old, unsigned long new,
  */
 #define NET_IP_ALIGN    0
 #define NET_SKB_PAD     L1_CACHE_BYTES
+
+#define cmpxchg64(ptr, o, n)                                            \
+  ({                                                                    \
+        BUILD_BUG_ON(sizeof(*(ptr)) != 8);                              \
+        cmpxchg((ptr), (o), (n));                                       \
+  })
+#define cmpxchg64_local(ptr, o, n)                                      \
+  ({                                                                    \
+        BUILD_BUG_ON(sizeof(*(ptr)) != 8);                              \
+        cmpxchg_local((ptr), (o), (n));                                 \
+  })
+#else
+#include <asm-generic/cmpxchg-local.h>
+#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
 #endif
 
 #define arch_align_stack(x) (x)