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    Subject[patch 04/23] 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>
    CC: clameter@sgi.com
    CC: hskinnemoen@atmel.com
    ---
    include/asm-avr32/system.h | 23 +++++++++++++++++++++++
    1 file changed, 23 insertions(+)
    Index: linux-2.6-lttng/include/asm-avr32/system.h
    ===================================================================
    --- linux-2.6-lttng.orig/include/asm-avr32/system.h 2007-07-20 19:10:57.000000000 -0400
    +++ linux-2.6-lttng/include/asm-avr32/system.h 2007-07-20 19:32:36.000000000 -0400
    @@ -140,6 +140,29 @@ static inline unsigned long __cmpxchg(vo
    (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,
    --
    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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