Re: [PATCH v2 08/16] mm/page_alloc: add missing is_migrate_isolate() check in set_page_guard()

[David Hildenbrand]

On 16.09.22 09:22, Miaohe Lin wrote:
> 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
>
> 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>

--
Thanks,

David / dhildenb