Re: WARNING: at mm/page-writeback.c:1990 __set_page_dirty_nobuffers+0x13a/0x170()

quoted

-       set_pageblock_migratetype(page, MIGRATE_MOVABLE);
-       move_freepages_block(page_zone(page), page, MIGRATE_MOVABLE);
+       set_pageblock_migratetype(start_page, MIGRATE_MOVABLE);
+       move_freepages_block(page_zone(start_page), start_page, MIGRATE_MOVABLE);

No.  I guess we can assume the incoming page was valid (fair?),
so should still use that, but something else for the loop iterator.

Fair. passed page is always valid.

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