[053/143] mm,page_alloc: drop unnecessary checks from pfn_range_valid_contig

Commit Message

Andrew Morton May 5, 2021, 1:35 a.m. UTC

From: Oscar Salvador <[e-mail]>
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/[e-mail]
Signed-off-by: Oscar Salvador <[e-mail]>
Suggested-by: David Hildenbrand <[e-mail]>
Reviewed-by: David Hildenbrand <[e-mail]>
Acked-by: Mike Kravetz <[e-mail]>
Acked-by: Michal Hocko <[e-mail]>
Cc: Muchun Song <[e-mail]>
Cc: Vlastimil Babka <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
---

 mm/page_alloc.c |    6 ------
 1 file changed, 6 deletions(-)

Patch

--- 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;
 }