From: Oscar Salvador <osalvador@xxxxxxx> Subject: mm,page_alloc: drop unnecessary checks from pfn_range_valid_contig pfn_range_valid_contig() bails out when it finds an in-use page or a hugetlb page, among other things. We can drop the in-use page check since __alloc_contig_pages can migrate away those pages, and the hugetlb page check can go too since isolate_migratepages_range is now capable of dealing with hugetlb pages. Either way, those checks are racy so let the end function handle it when the time comes. Link: https://lkml.kernel.org/r/20210419075413.1064-8-osalvador@xxxxxxx Signed-off-by: Oscar Salvador <osalvador@xxxxxxx> Suggested-by: David Hildenbrand <david@xxxxxxxxxx> Reviewed-by: David Hildenbrand <david@xxxxxxxxxx> Acked-by: Mike Kravetz <mike.kravetz@xxxxxxxxxx> Acked-by: Michal Hocko <mhocko@xxxxxxxx> Cc: Muchun Song <songmuchun@xxxxxxxxxxxxx> Cc: Vlastimil Babka <vbabka@xxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/page_alloc.c | 6 ------ 1 file changed, 6 deletions(-) --- a/mm/page_alloc.c~mmpage_alloc-drop-unnecessary-checks-from-pfn_range_valid_contig +++ a/mm/page_alloc.c @@ -8898,12 +8898,6 @@ static bool pfn_range_valid_contig(struc if (PageReserved(page)) return false; - - if (page_count(page) > 0) - return false; - - if (PageHuge(page)) - return false; } return true; } _
