Add cmpxchg_local, cmpxchg64 and cmpxchg64_local to ia64

Add the primitives cmpxchg_local, cmpxchg64 and cmpxchg64_local to ia64. They
use cmpxchg_acq as underlying macro, just like the already existing ia64
cmpxchg().

Changelog:

ia64 cmpxchg_local coding style fix
Quoting Keith Owens:

As a matter of coding style, I prefer

#define cmpxchg_local   cmpxchg
#define cmpxchg64_local cmpxchg64

Which makes it absolutely clear that they are the same code.  With your
patch, humans have to do a string compare of two defines to see if they
are the same.

Note cmpxchg is *not* a performance win vs interrupt disable / enable on IA64.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Acked-by: Christoph Lameter <clameter@sgi.com>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Keith Owens <kaos@ocs.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/asm-ia64/intrinsics.h b/include/asm-ia64/intrinsics.h
index 3a95aa4..f1135b5 100644 (file)
--- a/include/asm-ia64/intrinsics.h
+++ b/include/asm-ia64/intrinsics.h
@@ -153,11 +153,17 @@ extern long ia64_cmpxchg_called_with_bad_pointer (void);
        (__typeof__(old)) _r_;                                                          \
 })
 
-#define cmpxchg_acq(ptr,o,n)   ia64_cmpxchg(acq, (ptr), (o), (n), sizeof(*(ptr)))
-#define cmpxchg_rel(ptr,o,n)   ia64_cmpxchg(rel, (ptr), (o), (n), sizeof(*(ptr)))
+#define cmpxchg_acq(ptr, o, n) \
+       ia64_cmpxchg(acq, (ptr), (o), (n), sizeof(*(ptr)))
+#define cmpxchg_rel(ptr, o, n) \
+       ia64_cmpxchg(rel, (ptr), (o), (n), sizeof(*(ptr)))
 
 /* for compatibility with other platforms: */
-#define cmpxchg(ptr,o,n)       cmpxchg_acq(ptr,o,n)
+#define cmpxchg(ptr, o, n)     cmpxchg_acq((ptr), (o), (n))
+#define cmpxchg64(ptr, o, n)   cmpxchg_acq((ptr), (o), (n))
+
+#define cmpxchg_local          cmpxchg
+#define cmpxchg64_local                cmpxchg64
 
 #ifdef CONFIG_IA64_DEBUG_CMPXCHG
 # define CMPXCHG_BUGCHECK_DECL int _cmpxchg_bugcheck_count = 128;