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

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Date:	Fri, 01 Jun 2012 04:51:37 -0400
From:	KOSAKI Motohiro <kosaki.motohiro@...il.com>
To:	Hugh Dickins <hughd@...gle.com>
CC:	Dave Jones <davej@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Cong Wang <amwang@...hat.com>, 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()

>   	mlock_migrate_page(newpage, page);
> --- 3.4.0+/mm/page-writeback.c	2012-05-29 08:09:58.304806782 -0700
> +++ linux/mm/page-writeback.c	2012-06-01 00:23:43.984116973 -0700
> @@ -1987,7 +1987,10 @@ int __set_page_dirty_nobuffers(struct pa
>   		mapping2 = page_mapping(page);
>   		if (mapping2) { /* Race with truncate? */
>   			BUG_ON(mapping2 != mapping);
> -			WARN_ON_ONCE(!PagePrivate(page)&&  !PageUptodate(page));
> +			if (WARN_ON(!PagePrivate(page)&&  !PageUptodate(page)))
> +				print_symbol(KERN_WARNING
> +				    "mapping->a_ops->writepage: %s\n",
> +				    (unsigned long)mapping->a_ops->writepage);

type mismatch? I guess you want %pf or %pF.


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