PGALLOC_GFP
return (pgd_t *)__get_free_page(pgtable_gfp_flags(mm, PGALLOC_GFP));
page = alloc_pages(pgtable_gfp_flags(mm, PGALLOC_GFP | __GFP_RETRY_MAYFAIL),
gfp_t gfp = PGALLOC_GFP;
struct page *page = alloc_pages_node(node, PGALLOC_GFP, 0);
struct page *page = alloc_pages_node(node, PGALLOC_GFP, 0);