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Rev 1888 Rev 1890
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static inline long atomic_add(atomic_t *val, int i)
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static inline long atomic_add(atomic_t *val, int i)
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{
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{
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    uint64_t a, b;
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    uint64_t a, b;
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    do {
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    do {
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        volatile uintptr_t x = (uint64_t) &val->count;
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        a = *((uint64_t *) x);
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        a = val->count;
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        b = a + i;
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        b = a + i;
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        __asm__ volatile ("casx %0, %1, %2\n": "+m" (*((uint64_t *)x)), "+r" (a), "+r" (b));
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        __asm__ volatile ("casx %0, %2, %1\n" : "+m" (*val), "+r" (b) : "r" (a));
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    } while (a != b);
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    } while (a != b);
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    return a;
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    return a;
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}
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}
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