D48168.diff
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	diff --git a/sys/dev/hwpmc/hwpmc_x86.c b/sys/dev/hwpmc/hwpmc_x86.c
	--- a/sys/dev/hwpmc/hwpmc_x86.c
	+++ b/sys/dev/hwpmc/hwpmc_x86.c
	@@ -230,7 +230,7 @@
	pmc_md_initialize(void)
	{
	int i;
	- struct pmc_mdep *md;
	+ struct pmc_mdep *md = NULL;

	/* determine the CPU kind */
	if (cpu_vendor_id == CPU_VENDOR_AMD \|\|
	@@ -238,17 +238,18 @@
	md = pmc_amd_initialize();
	else if (cpu_vendor_id == CPU_VENDOR_INTEL)
	md = pmc_intel_initialize();
	- else
	+
	+ if (md == NULL)
	return (NULL);

	+ nmi_register_handler(md->pmd_intr);
	/* disallow sampling if we do not have an LAPIC */
	- if (md != NULL && !lapic_enable_pcint())
	+ if (!lapic_enable_pcint())
	for (i = 0; i < md->pmd_nclass; i++) {
	if (i == PMC_CLASS_INDEX_SOFT)
	continue;
	md->pmd_classdep[i].pcd_caps &= ~PMC_CAP_INTERRUPT;
	}
	- nmi_register_handler(md->pmd_intr);

	return (md);
	}
	@@ -256,9 +257,10 @@
	void
	pmc_md_finalize(struct pmc_mdep *md)
	{
	-
	- lapic_disable_pcint();
	- nmi_remove_handler(md->pmd_intr);
	+ if (md != NULL) {
	+ lapic_disable_pcint();
	+ nmi_remove_handler(md->pmd_intr);
	+ }
	if (cpu_vendor_id == CPU_VENDOR_AMD \|\|
	cpu_vendor_id == CPU_VENDOR_HYGON)
	pmc_amd_finalize(md);