The patch titled
Subject: mm: page_isolation: use compound_nr() correctly in isolate_single_pageblock()
has been added to the -mm mm-hotfixes-unstable branch. Its filename is
mm-page_isolation-use-compound_nr-correctly-in-isolate_single_pageblock.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-page_isolation-use-compound_nr-correctly-in-isolate_single_pageblock.patch
This patch will later appear in the mm-hotfixes-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Zi Yan <ziy@xxxxxxxxxx>
Subject: mm: page_isolation: use compound_nr() correctly in isolate_single_pageblock()
Date: Mon, 30 May 2022 22:44:50 -0400
When compound_nr(page) was used, page was not guaranteed to be the head of
the compound page and it could cause an infinite loop. Fix it by calling
it on the head page.
Link: https://lkml.kernel.org/r/20220531024450.2498431-1-zi.yan@xxxxxxxx
Fixes: b2c9e2fbba32 ("mm: make alloc_contig_range work at pageblock granularity")
Signed-off-by: Zi Yan <ziy@xxxxxxxxxx>
Reported-by: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Link: https://lore.kernel.org/linux-mm/20220530115027.123341-1-anshuman.khandual@xxxxxxx/
Reviewed-by: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Qian Cai <quic_qiancai@xxxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: Eric Ren <renzhengeek@xxxxxxxxx>
Cc: Mike Rapoport <rppt@xxxxxxxxxx>
Cc: Oscar Salvador <osalvador@xxxxxxx>
Cc: Christophe Leroy <christophe.leroy@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_isolation.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/page_isolation.c~mm-page_isolation-use-compound_nr-correctly-in-isolate_single_pageblock
+++ a/mm/page_isolation.c
@@ -385,9 +385,9 @@ static int isolate_single_pageblock(unsi
* above do the rest. If migration is not possible, just fail.
*/
if (PageCompound(page)) {
- unsigned long nr_pages = compound_nr(page);
struct page *head = compound_head(page);
unsigned long head_pfn = page_to_pfn(head);
+ unsigned long nr_pages = compound_nr(head);
if (head_pfn + nr_pages <= boundary_pfn) {
pfn = head_pfn + nr_pages;
_
Patches currently in -mm which might be from ziy@xxxxxxxxxx are
mm-page_isolation-use-compound_nr-correctly-in-isolate_single_pageblock.patch
