diff options
| -rw-r--r-- | sys/vm/vm_phys.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/sys/vm/vm_phys.c b/sys/vm/vm_phys.c index ed358d7cd4a9..a3af3964fba4 100644 --- a/sys/vm/vm_phys.c +++ b/sys/vm/vm_phys.c @@ -690,15 +690,17 @@ vm_phys_split_pages(vm_page_t m, int oind, struct vm_freelist *fl, int order, * 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) { |