Function pmap_call_on_active_cpus

freebsd/mips/mips/pmap.c:625–662

#ifdef	SMP
static __inline void
pmap_call_on_active_cpus(pmap_t pmap, void (*fn)(void *), void *arg)
{
	int	cpuid, cpu, self;
	cpuset_t active_cpus;

	sched_pin();
	if (is_kernel_pmap(pmap)) {
		smp_rendezvous(NULL, fn, NULL, arg);
		goto out;
	}
	/* Force ASID update on inactive CPUs */
	CPU_FOREACH(cpu) {
		if (!CPU_ISSET(cpu, &pmap->pm_active))
			pmap->pm_asid[cpu].gen = 0;
	}
	cpuid = PCPU_GET(cpuid);
	/*
	 * XXX: barrier/locking for active?
	 *
	 * Take a snapshot of active here, any further changes are ignored.
	 * tlb update/invalidate should be harmless on inactive CPUs
	 */
	active_cpus = pmap->pm_active;
	self = CPU_ISSET(cpuid, &active_cpus);
	CPU_CLR(cpuid, &active_cpus);
	/* Optimize for the case where this cpu is the only active one */
	if (CPU_EMPTY(&active_cpus)) {
		if (self)
			fn(arg);
	} else {
		if (self)
			CPU_SET(cpuid, &active_cpus);
		smp_rendezvous_cpus(active_cpus, NULL, fn, NULL, arg);
	}
out:
	sched_unpin();
}
#else /* !SMP */
static __inline void
pmap_call_on_active_cpus(pmap_t pmap, void (*fn)(void *), void *arg)