linux-kernel - Re: WARNING: at mm/page-writeback.c:1990 __set_page_dirty

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Message-ID: <4FCC13AC.3070005@gmail.com>
Date:	Sun, 03 Jun 2012 21:47:24 -0400
From:	KOSAKI Motohiro <kosaki.motohiro@...il.com>
To:	Hugh Dickins <hughd@...gle.com>
CC:	Minchan Kim <minchan@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>,
	Dave Jones <davej@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Cong Wang <amwang@...hat.com>,
	Markus Trippelsdorf <markus@...ppelsdorf.de>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	kosaki.motohiro@...il.com
Subject: Re: WARNING: at mm/page-writeback.c:1990 __set_page_dirty_nobuffers+0x13a/0x170()

>> -       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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