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/linux-master/mm/
H A Dpage_alloc.c6786 struct page *page_head = page - (pfn & ((1 << order) - 1)); local
6787 int page_order = buddy_order(page_head);
6789 if (PageBuddy(page_head) && page_order >= order) {
6790 unsigned long pfn_head = page_to_pfn(page_head);
6791 int migratetype = get_pfnblock_migratetype(page_head,
6794 del_page_from_free_list(page_head, zone, page_order,
6796 break_down_buddy_pages(zone, page_head, page, 0,
6802 if (page_count(page_head) > 0)

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