+ mm-compaction-fast_find_migrateblock-should-return-pfn-in-the-target-zone.patch added to mm-unstable branch

+ mm-compaction-fast_find_migrateblock-should-return-pfn-in-the-target-zone.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: mm, compaction: fast_find_migrateblock() should return pfn in the target zone
has been added to the -mm mm-unstable branch.  Its filename is
     mm-compaction-fast_find_migrateblock-should-return-pfn-in-the-target-zone.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-compaction-fast_find_migrateblock-should-return-pfn-in-the-target-zone.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Rei Yamamoto <yamamoto.rei@jp.fujitsu.com>
Subject: mm, compaction: fast_find_migrateblock() should return pfn in the target zone

Prevent returning a pfn outside the target zone in case that not aligned
with pageblock boundary.  Otherwise isolate_migratepages_block() would
handle pages not in the target zone.

Link: https://lkml.kernel.org/r/20220511044300.4069-1-yamamoto.rei@jp.fujitsu.com
Signed-off-by: Rei Yamamoto <yamamoto.rei@jp.fujitsu.com>
Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: Don Dutile <ddutile@redhat.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Wonhyuk Yang <vvghjk1234@gmail.com>
Cc: Rei Yamamoto <yamamoto.rei@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/compaction.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/mm/compaction.c~mm-compaction-fast_find_migrateblock-should-return-pfn-in-the-target-zone
+++ a/mm/compaction.c
@@ -1848,6 +1848,8 @@ static unsigned long fast_find_migratebl
 
 				update_fast_start_pfn(cc, free_pfn);
 				pfn = pageblock_start_pfn(free_pfn);
+				if (pfn < cc->zone->zone_start_pfn)
+					pfn = cc->zone->zone_start_pfn;
 				cc->fast_search_fail = 0;
 				found_block = true;
 				set_pageblock_skip(freepage);
_

Patches currently in -mm which might be from yamamoto.rei@jp.fujitsu.com are

mm-compaction-fast_find_migrateblock-should-return-pfn-in-the-target-zone.patch