+ mmpage_alloc-drop-unnecessary-checks-from-pfn_range_valid_contig.patch added to -mm tree

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The patch titled
     Subject: mm,page_alloc: drop unnecessary checks from pfn_range_valid_contig
has been added to the -mm tree.  Its filename is
     mmpage_alloc-drop-unnecessary-checks-from-pfn_range_valid_contig.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/mmpage_alloc-drop-unnecessary-checks-from-pfn_range_valid_contig.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/mmpage_alloc-drop-unnecessary-checks-from-pfn_range_valid_contig.patch

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------------------------------------------------------
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/20210319132004.4341-6-osalvador@xxxxxxx
Signed-off-by: Oscar Salvador <osalvador@xxxxxxx>
Suggested-by: David Hildenbrand <david@xxxxxxxxxx>
Reviewed-by: David Hildenbrand <david@xxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
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
@@ -8744,12 +8744,6 @@ 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;
 }
_

Patches currently in -mm which might be from osalvador@xxxxxxx are

x86-vmemmap-drop-handling-of-4k-unaligned-vmemmap-range.patch
x86-vmemmap-drop-handling-of-1gb-vmemmap-ranges.patch
x86-vmemmap-handle-unpopulated-sub-pmd-ranges.patch
x86-vmemmap-optimize-for-consecutive-sections-in-partial-populated-pmds.patch
mmpage_alloc-bail-out-earlier-on-enomem-in-alloc_contig_migrate_range.patch
mmcompaction-let-isolate_migratepages_rangeblock-return-error-codes.patch
mm-make-alloc_contig_range-handle-free-hugetlb-pages.patch
mm-make-alloc_contig_range-handle-in-use-hugetlb-pages.patch
mmpage_alloc-drop-unnecessary-checks-from-pfn_range_valid_contig.patch




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