The quilt patch titled
Subject: mm/page_alloc: add missing is_migrate_isolate() check in set_page_guard()
has been removed from the -mm tree. Its filename was
mm-page_alloc-add-missing-is_migrate_isolate-check-in-set_page_guard.patch
This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------
From: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Subject: mm/page_alloc: add missing is_migrate_isolate() check in set_page_guard()
Date: Fri, 16 Sep 2022 15:22:49 +0800
In MIGRATE_ISOLATE case, zone freepage state shouldn't be modified as
caller will take care of it. Add missing is_migrate_isolate() here to
avoid possible unbalanced freepage state. This would happen if someone
isolates the block, and then we face an MCE failure/soft-offline on a page
within that block. __mod_zone_freepage_state() will be triggered via
below call trace which already had been triggered back when block was
isolated:
take_page_off_buddy
break_down_buddy_pages
set_page_guard
Link: https://lkml.kernel.org/r/20220916072257.9639-9-linmiaohe@xxxxxxxxxx
Fixes: 06be6ff3d2ec ("mm,hwpoison: rework soft offline for free pages")
Signed-off-by: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Reviewed-by: Oscar Salvador <osalvador@xxxxxxx>
Reviewed-by: David Hildenbrand <david@xxxxxxxxxx>
Cc: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/mm/page_alloc.c~mm-page_alloc-add-missing-is_migrate_isolate-check-in-set_page_guard
+++ a/mm/page_alloc.c
@@ -873,7 +873,8 @@ static inline bool set_page_guard(struct
INIT_LIST_HEAD(&page->buddy_list);
set_page_private(page, order);
/* Guard pages are not available for any usage */
- __mod_zone_freepage_state(zone, -(1 << order), migratetype);
+ if (!is_migrate_isolate(migratetype))
+ __mod_zone_freepage_state(zone, -(1 << order), migratetype);
return true;
}
_
Patches currently in -mm which might be from linmiaohe@xxxxxxxxxx are
