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Add cmpxchg_local to avr32 

Use the new generic cmpxchg_local (disables interrupt) for 8, 16 and 64 bits
cmpxchg_local. Use the __cmpxchg_u32 primitive for 32 bits cmpxchg_local.

Note that cmpxchg only uses the __cmpxchg_u32 or __cmpxchg_u64 and will cause
a linker error if called with 8 or 16 bits argument.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Acked-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
Cc: Haavard Skinnemoen <hskinnemoen@atmel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mathieu Desnoyers 2008-02-07 00:16:12 -08:00 committed by Linus Torvalds
parent 176393d423
commit 5e86c11d3e
1 changed files with 23 additions and 0 deletions
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23
include/asm-avr32/system.h
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@ -145,6 +145,29 @@ static inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old,
(unsigned long)(new), \
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(ptr, old, new);
default:
return __cmpxchg_local_generic(ptr, old, new, size);
}
return old;
}
#define cmpxchg_local(ptr, old, new) \
((typeof(*(ptr)))__cmpxchg_local((ptr), (unsigned long)(old), \
(unsigned long)(new), \
sizeof(*(ptr))))
#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
struct pt_regs;
void NORET_TYPE die(const char *str, struct pt_regs *regs, long err);
void _exception(long signr, struct pt_regs *regs, int code,