linux-kernel - Re: [RFC][PATCH] lru_add_drain_all() don't use schedule_on_each

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Message-ID: <20081024192031.GA4155@osiris.boeblingen.de.ibm.com>
Date:	Fri, 24 Oct 2008 21:20:31 +0200
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	Nick Piggin <npiggin@...e.de>, linux-kernel@...r.kernel.org,
	Hugh Dickins <hugh@...itas.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Lee Schermerhorn <lee.schermerhorn@...com>, linux-mm@...ck.org,
	Christoph Lameter <cl@...ux-foundation.org>
Subject: Re: [RFC][PATCH] lru_add_drain_all() don't use
	schedule_on_each_cpu()

On Fri, Oct 24, 2008 at 12:00:17AM +0900, KOSAKI Motohiro wrote:
> Hi Heiko,
> > This bug is caused by folloing dependencys.
> > 
> > some VM place has
> >       mmap_sem -> kevent_wq
> > 
> > net/core/dev.c::dev_ioctl()  has
> >      rtnl_lock  ->  mmap_sem        (*) almost ioctl has
> > copy_from_user() and it cause page fault.
> > 
> > linkwatch_event has
> >     kevent_wq -> rtnl_lock
> > 
> > 
> > So, I think VM subsystem shouldn't use kevent_wq because many driver
> > use ioctl and work queue combination.
> > then drivers fixing isn't easy.
> > 
> > I'll make the patch soon.
> 
> My box can't reproduce this issue.
> Could you please test on following patch?

Your patch seems to fix the issue. At least I don't see the warning anymore ;)

Thanks,
Heiko
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