The patch titled
Add cmpxchg_local to ppc
has been removed from the -mm tree. Its filename was
add-cmpxchg_local-to-ppc.patch
This patch was dropped because an updated version will be merged
------------------------------------------------------
Subject: Add cmpxchg_local to ppc
From: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxx>
Add a local processor version of cmpxchg for ppc.
Implements __cmpxchg_u32_local and uses it for 32 bits cmpxchg_local.
It uses the non NMI safe cmpxchg_local_generic for 1, 2 and 8 bytes
cmpxchg_local.
Signed-off-by: Gunnar Larisch <gl@xxxxxxx>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/asm-ppc/system.h | 49 ++++++++++++++++++++++++++++++++++++-
1 file changed, 48 insertions(+), 1 deletion(-)
diff -puN include/asm-ppc/system.h~add-cmpxchg_local-to-ppc include/asm-ppc/system.h
--- a/include/asm-ppc/system.h~add-cmpxchg_local-to-ppc
+++ a/include/asm-ppc/system.h
@@ -209,12 +209,34 @@ __cmpxchg_u32(volatile unsigned int *p,
return prev;
}
+static __inline__ unsigned long
+__cmpxchg_u32_local(volatile unsigned int *p, unsigned int old,
+ unsigned int new)
+{
+ unsigned int prev;
+
+ __asm__ __volatile__ ("\n\
+1: lwarx %0,0,%2 \n\
+ cmpw 0,%0,%3 \n\
+ bne 2f \n"
+ PPC405_ERR77(0,%2)
+" stwcx. %4,0,%2 \n\
+ bne- 1b\n"
+"2:"
+ : "=&r" (prev), "=m" (*p)
+ : "r" (p), "r" (old), "r" (new), "m" (*p)
+ : "cc", "memory");
+
+ return prev;
+}
+
/* This function doesn't exist, so you'll get a linker error
if something tries to do an invalid cmpxchg(). */
extern void __cmpxchg_called_with_bad_pointer(void);
static __inline__ unsigned long
-__cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size)
+__cmpxchg(volatile void *ptr, unsigned long old, unsigned long new,
+ unsigned int size)
{
switch (size) {
case 4:
@@ -236,6 +258,31 @@ __cmpxchg(volatile void *ptr, unsigned l
(unsigned long)_n_, sizeof(*(ptr))); \
})
+#include <asm-generic/cmpxchg-local.h>
+
+static inline unsigned long __cmpxchg_local(volatile void *ptr,
+ unsigned long old,
+ unsigned long new, int size)
+{
+ switch (size) {
+ case 4:
+ return __cmpxchg_u32_local(ptr, old, new);
+ default:
+ return __cmpxchg_local_generic(ptr, old, new, size);
+ }
+
+ return old;
+}
+
+/*
+ * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
+ * them available.
+ */
+#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) __cmpxchg64_local_generic((ptr), (o), (n))
+
#define arch_align_stack(x) (x)
#endif /* __KERNEL__ */
_
Patches currently in -mm which might be from mathieu.desnoyers@xxxxxxxxxx are
local_t-documentation-update-2.patch
markers-fix-warnings.patch
add-cmpxchg_local-to-ppc.patch
add-cmpxchg_local-to-s390.patch
add-cmpxchg_local-to-sh-use-generic-cmpxchg-instead-of-cmpxchg_u32.patch
add-cmpxchg_local-to-sh64.patch
add-cmpxchg_local-to-sparc-move-__cmpxchg-to-systemh.patch
add-cmpxchg_local-to-sparc64.patch
add-cmpxchg_local-to-v850.patch
add-cmpxchg_local-to-xtensa.patch
-
To unsubscribe from this list: send the line "unsubscribe mm-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
