linux-kernel - Re: 2.6.27-rc4: lots of 'in_atomic():1, irqs

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Message-ID: <20080828081113.GW20055@kernel.dk>
Date:	Thu, 28 Aug 2008 10:11:13 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Andre Noll <maan@...temlinux.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, jurriaan <thunder7@...all.nl>,
	linux-kernel@...r.kernel.org, Neil Brown <neilb@...e.de>
Subject: Re: 2.6.27-rc4: lots of 'in_atomic():1, irqs_disabled():0' with  software-raid1

On Thu, Aug 28 2008, Andre Noll wrote:
> On 09:48, Jens Axboe wrote:
> > Doh right, we of course can't block inside a RCU section. Then
> > bitmap.c:write_sb_page() wants fixing:
> > 
> >         rcu_read_lock();
> >         rdev_for_each_rcu(...)
> >                 md_super_write(...)
> >                         bio_alloc(GFP_NOIO, 1);
> 
> Also, md_super_write() does not check the return value of bio_alloc().
> That probably needs fixing as well.

No, that's the guarentee of mempool_alloc() - as long as you have
__GFP_WAIT set, you'll never see a NULL return.

-- 
Jens Axboe

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