linux-kernel - Re: [PATCH][RFC] fix kernel BUG at mm/migrate.c:719! in 2.6.26-rc5-mm3

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Date:	Wed, 18 Jun 2008 10:54:00 +0900
From:	Daisuke Nishimura <nishimura@....nes.nec.co.jp>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Lee Schermerhorn <lee.schermerhorn@...com>,
	Nick Piggin <npiggin@...e.de>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, kernel-testers@...r.kernel.org
Subject: Re: [PATCH][RFC] fix kernel BUG at mm/migrate.c:719! in
 2.6.26-rc5-mm3

On Wed, 18 Jun 2008 00:33:18 +0900, KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> wrote:
> > @@ -715,13 +725,7 @@ unlock:
> >   		 * restored.
> >   		 */
> >   		list_del(&page->lru);
> > -		if (!page->mapping) {
> > -			VM_BUG_ON(page_count(page) != 1);
> > -			unlock_page(page);
> > -			put_page(page);		/* just free the old page */
> > -			goto end_migration;
> > -		} else
> > -			unlock = putback_lru_page(page);
> > +		unlock = putback_lru_page(page);
> >  	}
> >  
> >  	if (unlock)
> 
> this part is really necessary?
> I tryed to remove it, but any problem doesn't happend.
> 
I made this part first, and added a fix for migration_entry_wait later.

So, I haven't test without this part, and I think it will cause
VM_BUG_ON() here without this part.

Anyway, I will test it.


> Of cource, another part is definitly necessary for specurative pagecache :)
> 
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