D41317.diff
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	diff --git a/sys/vm/vm_phys.c b/sys/vm/vm_phys.c
	--- a/sys/vm/vm_phys.c
	+++ b/sys/vm/vm_phys.c
	@@ -690,15 +690,17 @@
	* term fragmentation by promoting contemporaneous allocation and (hopefully)
	* deallocation.
	*
	- * The physical page m's buddy must not be free.
	+ * If npages is zero, this function does nothing and ignores the physical page
	+ * parameter m. Otherwise, the physical page m's buddy must not be free.
	*/
	static vm_page_t
	vm_phys_enq_range(vm_page_t m, u_int npages, struct vm_freelist *fl, int tail)
	{
	int order;

	- KASSERT(((VM_PAGE_TO_PHYS(m) + npages * PAGE_SIZE) &
	- ((PAGE_SIZE << fls(npages / 2)) - 1)) == 0,
	+ KASSERT(npages == 0 \|\|
	+ ((VM_PAGE_TO_PHYS(m) + npages * PAGE_SIZE) &
	+ ((PAGE_SIZE << (fls(npages) - 1)) - 1)) == 0,
	("vm_phys_enq_range: page %p and npages %u are misaligned",
	m, npages));
	while (npages > 0) {