-/*
- * huge_pages_needed tries to determine the number of new huge pages that
- * will be required to fully populate this VMA. This will be equal to
- * the size of the VMA in huge pages minus the number of huge pages
- * (covered by this VMA) that are found in the page cache.
- *
- * Result is in bytes to be compatible with is_hugepage_mem_enough()
- */
-static unsigned long
-huge_pages_needed(struct address_space *mapping, struct vm_area_struct *vma)
-{
- int i;
- struct pagevec pvec;
- unsigned long start = vma->vm_start;
- unsigned long end = vma->vm_end;
- unsigned long hugepages = (end - start) >> HPAGE_SHIFT;
- pgoff_t next = vma->vm_pgoff >> (HPAGE_SHIFT - PAGE_SHIFT);
- pgoff_t endpg = next + hugepages;
-
- pagevec_init(&pvec, 0);
- while (next < endpg) {
- if (!pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE))
- break;
- for (i = 0; i < pagevec_count(&pvec); i++) {
- struct page *page = pvec.pages[i];
- if (page->index > next)
- next = page->index;
- if (page->index >= endpg)
- break;
- next++;
- hugepages--;
- }
- huge_pagevec_release(&pvec);
- }
- return hugepages << HPAGE_SHIFT;
-}
-