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    Subject[patch 06/28] Add cmpxchg64 and cmpxchg64_local to x86_64
    Make sure that at least cmpxchg64_local is available on all architectures to use
    for unsigned long long values.

    Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
    CC: Andi Kleen <ak@muc.de>
    ---
    include/asm-x86_64/cmpxchg.h | 22 ++++++++++++++++------
    1 file changed, 16 insertions(+), 6 deletions(-)

    Index: linux-2.6-lttng/include/asm-x86_64/cmpxchg.h
    ===================================================================
    --- linux-2.6-lttng.orig/include/asm-x86_64/cmpxchg.h 2007-10-31 17:32:44.000000000 -0400
    +++ linux-2.6-lttng/include/asm-x86_64/cmpxchg.h 2007-10-31 17:58:01.000000000 -0400
    @@ -124,11 +124,21 @@ static inline unsigned long __cmpxchg_lo
    return old;
    }

    -#define cmpxchg(ptr,o,n)\
    - ((__typeof__(*(ptr)))__cmpxchg((ptr),(unsigned long)(o),\
    - (unsigned long)(n),sizeof(*(ptr))))
    -#define cmpxchg_local(ptr,o,n)\
    - ((__typeof__(*(ptr)))__cmpxchg_local((ptr),(unsigned long)(o),\
    - (unsigned long)(n),sizeof(*(ptr))))
    +#define cmpxchg(ptr, o, n) \
    + ((__typeof__(*(ptr)))__cmpxchg((ptr), (unsigned long)(o), \
    + (unsigned long)(n), sizeof(*(ptr))))
    +#define cmpxchg64(ptr, o, n) \
    + ({ \
    + BUILD_BUG_ON(sizeof(*(ptr)) != 8); \
    + cmpxchg((ptr), (o), (n)); \
    + })
    +#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) \
    + ({ \
    + BUILD_BUG_ON(sizeof(*(ptr)) != 8); \
    + cmpxchg_local((ptr), (o), (n)); \
    + })

    #endif
    --
    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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