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Subject[patch 21/23] Add cmpxchg_local to sparc64 (update)
Add cmpxchg_local to sparc64

Use cmpxchg_u32 and cmpxchg_u64 for cmpxchg_local and cmpxchg64_local. For other
type sizes, use the new generic cmpxchg_local (disables interrupt).

Change:
* Julian Calaby (julian.calaby@gmail.com) wrote:
> Shouldn't #includes go at the start of the file?
>

Since the header depends on local_irqsave/local_irqrestore, it must be
included after their declaration.

Actually, being below the
#include <linux/irqflags.h> should be enough, and on sparc64 it is
included at the beginning of system.h.

So it makes sense to move it up for sparc64.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
CC: clameter@sgi.com
CC: sparclinux@vger.kernel.org
CC: wli@holomorphy.com
---
include/asm-sparc64/system.h | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)

Index: linux-2.6-lttng/include/asm-sparc64/system.h
===================================================================
--- linux-2.6-lttng.orig/include/asm-sparc64/system.h 2007-08-20 17:40:57.000000000 -0400
+++ linux-2.6-lttng/include/asm-sparc64/system.h 2007-08-20 19:42:32.000000000 -0400
@@ -9,6 +9,7 @@
#ifndef __ASSEMBLY__

#include <linux/irqflags.h>
+#include <asm-generic/cmpxchg-local.h>

/*
* Sparc (general) CPU types
@@ -314,6 +315,30 @@ __cmpxchg(volatile void *ptr, unsigned l
(unsigned long)_n_, sizeof(*(ptr))); \
})

+/*
+ * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
+ * them available.
+ */
+
+static inline unsigned long __cmpxchg_local(volatile void *ptr,
+ unsigned long old,
+ unsigned long new, int size)
+{
+ switch (size) {
+ case 4:
+ case 8: return __cmpxchg(ptr, old, new, size);
+ default:
+ return __cmpxchg_local_generic(ptr, old, new, size);
+ }
+
+ return old;
+}
+
+#define cmpxchg_local(ptr,o,n) \
+ (__typeof__(*(ptr)))__cmpxchg_local((ptr), (unsigned long)(o), \
+ (unsigned long)(n), sizeof(*(ptr)))
+#define cmpxchg64_local(ptr,o,n) cmpxchg_local((ptr), (o), (n))
+
#endif /* !(__ASSEMBLY__) */

#define arch_align_stack(x) (x)
--
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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