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    Subject[PATCH 08/09] atomic.h : Add atomic64 cmpxchg, xchg and add_unless to sparc64
    Date
    atomic.h : Add atomic64 cmpxchg, xchg and add_unless to sparc64

    Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>

    --- a/include/asm-sparc64/atomic.h
    +++ b/include/asm-sparc64/atomic.h
    @@ -70,12 +70,13 @@ extern int atomic64_sub_ret(int, atomic64_t *);
    #define atomic_add_negative(i, v) (atomic_add_ret(i, v) < 0)
    #define atomic64_add_negative(i, v) (atomic64_add_ret(i, v) < 0)

    -#define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
    +#define atomic_cmpxchg(v, o, n) \
    + ((__typeof__((v)->counter))cmpxchg(&((v)->counter), (o), (n)))
    #define atomic_xchg(v, new) (xchg(&((v)->counter), new))

    #define atomic_add_unless(v, a, u) \
    ({ \
    - int c, old; \
    + __typeof__((v)->counter) c, old; \
    c = atomic_read(v); \
    for (;;) { \
    if (unlikely(c == (u))) \
    @@ -89,6 +90,26 @@ extern int atomic64_sub_ret(int, atomic64_t *);
    })
    #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)

    +#define atomic64_cmpxchg(v, o, n) \
    + ((__typeof__((v)->counter))cmpxchg(&((v)->counter), (o), (n)))
    +#define atomic64_xchg(v, new) (xchg(&((v)->counter), new))
    +
    +#define atomic64_add_unless(v, a, u) \
    +({ \
    + __typeof__((v)->counter) c, old; \
    + c = atomic64_read(v); \
    + for (;;) { \
    + if (unlikely(c == (u))) \
    + break; \
    + old = atomic64_cmpxchg((v), c, c + (a)); \
    + if (likely(old == c)) \
    + break; \
    + c = old; \
    + } \
    + likely(c != (u)); \
    +})
    +#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)
    +
    /* Atomic operations are already serializing */
    #ifdef CONFIG_SMP
    #define smp_mb__before_atomic_dec() membar_storeload_loadload();
    -
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