-
-bool is_hugepage_active(struct page *page)
-{
- VM_BUG_ON_PAGE(!PageHuge(page), page);
- /*
- * This function can be called for a tail page because the caller,
- * scan_movable_pages, scans through a given pfn-range which typically
- * covers one memory block. In systems using gigantic hugepage (1GB
- * for x86_64,) a hugepage is larger than a memory block, and we don't
- * support migrating such large hugepages for now, so return false
- * when called for tail pages.
- */
- if (PageTail(page))
- return false;
- /*
- * Refcount of a hwpoisoned hugepages is 1, but they are not active,
- * so we should return false for them.
- */
- if (unlikely(PageHWPoison(page)))
- return false;
- return page_count(page) > 0;
-}