D28111.diff
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	diff --git a/sys/amd64/amd64/mp_machdep.c b/sys/amd64/amd64/mp_machdep.c
	--- a/sys/amd64/amd64/mp_machdep.c
	+++ b/sys/amd64/amd64/mp_machdep.c
	@@ -660,6 +660,7 @@
	cpuset_t other_cpus, mask1;
	uint32_t generation, *p_cpudone;
	int cpu;
	+ bool is_all;

	/*
	* It is not necessary to signal other CPUs while booting or
	@@ -673,14 +674,10 @@
	/*
	* Check for other cpus. Return if none.
	*/
	- if (!CPU_CMP(&mask, &all_cpus)) {
	- if (mp_ncpus <= 1)
	- goto local_cb;
	- } else {
	- CPU_CLR(PCPU_GET(cpuid), &mask);
	- if (CPU_EMPTY(&mask))
	- goto local_cb;
	- }
	+ is_all = !CPU_CMP(&mask, &all_cpus);
	+ CPU_CLR(PCPU_GET(cpuid), &mask);
	+ if (CPU_EMPTY(&mask))
	+ goto local_cb;

	/*
	* Initiator must have interrupts enabled, which prevents
	@@ -719,7 +716,7 @@
	* (zeroing slot) and reading from it below (wait for
	* acknowledgment).
	*/
	- if (!CPU_CMP(&mask, &all_cpus)) {
	+ if (is_all) {
	ipi_all_but_self(IPI_INVLOP);
	other_cpus = all_cpus;
	CPU_CLR(PCPU_GET(cpuid), &other_cpus);