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    Subject[PATCH 07/09] atomic.h : Add atomic64 cmpxchg, xchg and add_unless to powerpc
    Date
    atomic.h : Add atomic64 cmpxchg, xchg and add_unless to powerpc

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

    --- a/include/asm-powerpc/atomic.h
    +++ b/include/asm-powerpc/atomic.h
    @@ -165,7 +165,8 @@ static __inline__ int atomic_dec_return(atomic_t *v)
    return t;
    }

    -#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))

    /**
    @@ -413,6 +414,43 @@ static __inline__ long atomic64_dec_if_positive(atomic64_t *v)
    return t;
    }

    +#define atomic64_cmpxchg(v, o, n) \
    + ((__typeof__((v)->counter))cmpxchg(&((v)->counter), (o), (n)))
    +#define atomic64_xchg(v, new) (xchg(&((v)->counter), new))
    +
    +/**
    + * atomic64_add_unless - add unless the number is a given value
    + * @v: pointer of type atomic64_t
    + * @a: the amount to add to v...
    + * @u: ...unless v is equal to u.
    + *
    + * Atomically adds @a to @v, so long as it was not @u.
    + * Returns non-zero if @v was not @u, and zero otherwise.
    + */
    +static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u)
    +{
    + long t;
    +
    + __asm__ __volatile__ (
    + LWSYNC_ON_SMP
    +"1: ldarx %0,0,%1 # atomic_add_unless\n\
    + cmpd 0,%0,%3 \n\
    + beq- 2f \n\
    + add %0,%2,%0 \n"
    +" stdcx. %0,0,%1 \n\
    + bne- 1b \n"
    + ISYNC_ON_SMP
    +" subf %0,%2,%0 \n\
    +2:"
    + : "=&r" (t)
    + : "r" (&v->counter), "r" (a), "r" (u)
    + : "cc", "memory");
    +
    + return t != u;
    +}
    +
    +#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)
    +
    #endif /* __powerpc64__ */

    #include <asm-generic/atomic.h>
    -
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