Function atomic_subtract_64

freebsd/i386/include/atomic.h:639–649

}

static __inline void
atomic_subtract_64(volatile uint64_t *p, uint64_t v)
{
	uint64_t t;

	for (;;) {
		t = *p;
		if (atomic_cmpset_64(p, t, t - v))
			break;
	}
}

#endif /* _KERNEL */