vm_phys_enq_range: no alignment assert for npages==0
Do not assume that when vm_phys_enq_range is passed npages==0 that the vm_page argument is valid in any way, much less that it has a page-aligned address. Just don't look at it. Assert nothing about it. Reported by: karels Differential Revision: https://reviews.freebsd.org/D41317
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@ -690,15 +690,17 @@ vm_phys_split_pages(vm_page_t m, int oind, struct vm_freelist *fl, int order,
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* term fragmentation by promoting contemporaneous allocation and (hopefully)
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* deallocation.
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*
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* The physical page m's buddy must not be free.
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* If npages is zero, this function does nothing and ignores the physical page
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* parameter m. Otherwise, the physical page m's buddy must not be free.
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*/
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static vm_page_t
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vm_phys_enq_range(vm_page_t m, u_int npages, struct vm_freelist *fl, int tail)
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{
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int order;
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KASSERT(((VM_PAGE_TO_PHYS(m) + npages * PAGE_SIZE) &
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((PAGE_SIZE << fls(npages / 2)) - 1)) == 0,
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KASSERT(npages == 0 ||
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((VM_PAGE_TO_PHYS(m) + npages * PAGE_SIZE) &
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((PAGE_SIZE << (fls(npages) - 1)) - 1)) == 0,
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("vm_phys_enq_range: page %p and npages %u are misaligned",
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m, npages));
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while (npages > 0) {
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