The patch titled
Add cmpxchg_local to sh, use generic cmpxchg() instead of cmpxchg_u32
has been added to the -mm tree. Its filename is
add-cmpxchg_local-to-sh-use-generic-cmpxchg-instead-of-cmpxchg_u32.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: Add cmpxchg_local to sh, use generic cmpxchg() instead of cmpxchg_u32
From: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxx>
Use the new generic cmpxchg_local (disables interrupt). Also use the generic
cmpxchg as fallback if SMP is not set.
Since cmpxchg_u32 is _exactly_ the cmpxchg_local generic implementation, remove
it and use the generic version instead.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxx>
Cc: Paul Mundt <lethal@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/asm-sh/system.h | 48 +++++++++-----------------------------
1 file changed, 12 insertions(+), 36 deletions(-)
diff -puN include/asm-sh/system.h~add-cmpxchg_local-to-sh-use-generic-cmpxchg-instead-of-cmpxchg_u32 include/asm-sh/system.h
--- a/include/asm-sh/system.h~add-cmpxchg_local-to-sh-use-generic-cmpxchg-instead-of-cmpxchg_u32
+++ a/include/asm-sh/system.h
@@ -202,44 +202,20 @@ extern void __xchg_called_with_bad_point
#define xchg(ptr,x) \
((__typeof__(*(ptr)))__xchg((ptr),(unsigned long)(x), sizeof(*(ptr))))
-static inline unsigned long __cmpxchg_u32(volatile int * m, unsigned long old,
- unsigned long new)
-{
- __u32 retval;
- unsigned long flags;
-
- local_irq_save(flags);
- retval = *m;
- if (retval == old)
- *m = new;
- local_irq_restore(flags); /* implies memory barrier */
- return retval;
-}
-
-/* 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);
-
-#define __HAVE_ARCH_CMPXCHG 1
+#include <asm-generic/cmpxchg-local.h>
-static inline unsigned long __cmpxchg(volatile void * ptr, unsigned long old,
- unsigned long new, int size)
-{
- switch (size) {
- case 4:
- return __cmpxchg_u32(ptr, old, new);
- }
- __cmpxchg_called_with_bad_pointer();
- 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_generic((ptr), (unsigned long)(o), \
+ (unsigned long)(n), sizeof(*(ptr)))
+#define cmpxchg64_local(ptr,o,n) __cmpxchg64_local_generic((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))); \
- })
+#ifndef CONFIG_SMP
+#include <asm-generic/cmpxchg.h>
+#endif
extern void die(const char *str, struct pt_regs *regs, long err) __attribute__ ((noreturn));
_
Patches currently in -mm which might be from mathieu.desnoyers@xxxxxxxxxx are
add-cmpxchg_local-to-asm-generic-for-per-cpu-atomic-operations.patch
fall-back-on-interrupt-disable-in-cmpxchg8b-on-80386-and-80486.patch
add-cmpxchg64-and-cmpxchg64_local-to-alpha.patch
add-cmpxchg64-and-cmpxchg64_local-to-mips.patch
add-cmpxchg64-and-cmpxchg64_local-to-powerpc.patch
add-cmpxchg64-and-cmpxchg64_local-to-x86_64.patch
add-cmpxchg_local-to-arm.patch
add-cmpxchg_local-to-avr32.patch
add-cmpxchg_local-to-blackfin-replace-__cmpxchg-by-generic-cmpxchg.patch
add-cmpxchg_local-to-cris.patch
add-cmpxchg_local-to-frv.patch
add-cmpxchg_local-to-h8300.patch
add-cmpxchg_local-cmpxchg64-and-cmpxchg64_local-to-ia64.patch
new-cmpxchg_local-optimized-for-up-case-for-m32r.patch
fix-m32r-__xchg.patch
m32r-build-fix-of-arch-m32r-kernel-smpbootc.patch
local_t-m32r-use-architecture-specific-cmpxchg_local.patch
add-cmpxchg_local-to-m86k.patch
add-cmpxchg_local-to-m68knommu.patch
add-cmpxchg_local-to-parisc.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
-
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