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

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Date:	Fri, 1 Jun 2012 05:12:19 -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
Subject: Re: WARNING: at mm/page-writeback.c:1990 __set_page_dirty_nobuffers+0x13a/0x170()

On Fri, Jun 1, 2012 at 5:08 AM, Hugh Dickins <hughd@...gle.com> wrote:
> On Fri, 1 Jun 2012, KOSAKI Motohiro wrote:
>> >     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 don't think so: I just copied from print_bad_pte().
> Probably you're reading "printk" where it's "print_symbol"?

Oops, yes, sorry for noise.


>> I guess you want %pf or %pF.
>
> I expect there is new-fangled %pMagic that can do it too, yes.
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