linux-kernel - Re: [Ksummit-2010-discuss] [v2] Remaining BKL users, what to do

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Message-ID: <alpine.LNX.2.00.1010192237220.6879@pobox.suse.cz>
Date:	Tue, 19 Oct 2010 22:38:13 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Greg KH <greg@...ah.com>
Cc:	Oliver Neukum <oliver@...kum.org>, Jan Kara <jack@...e.cz>,
	Anders Larsen <al@...rsen.net>,
	dri-devel@...ts.freedesktop.org,
	ksummit-2010-discuss@...ts.linux-foundation.org,
	Mikulas Patocka <mikulas@...ax.karlin.mff.cuni.cz>,
	codalist@...emann.coda.cs.cmu.edu,
	Bryan Schumaker <bjschuma@...app.com>,
	Christoph Hellwig <hch@...radead.org>,
	Petr Vandrovec <vandrove@...cvut.cz>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Ingo Molnar <mingo@...e.hu>, linux-media@...r.kernel.org,
	Samuel Ortiz <samuel@...tiz.org>,
	Evgeniy Dushistov <dushistov@...l.ru>,
	Arnd Bergmann <arnd@...db.de>, autofs@...ux.kernel.org,
	Jan Harkes <jaharkes@...cmu.edu>, Valdis.Kletnieks@...edu,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	Andrew Hendry <andrew.hendry@...il.com>
Subject: Re: [Ksummit-2010-discuss] [v2] Remaining BKL users, what to do

On Tue, 19 Oct 2010, Greg KH wrote:

> > > > So no need to clean it up for multiprocessor support.
> > > > 
> > > > http://download.intel.com/design/chipsets/datashts/29067602.pdf
> > > > http://www.intel.com/design/chipsets/specupdt/29069403.pdf
> > > 
> > > Great, we can just drop all calls to lock_kernel() and the like in the
> > > driver and be done with it, right?
> > 
> > No,
> > 
> > you still need to switch off preemption.
> 
> Hm, how would you do that from within a driver?

preempt_disable()

-- 
Jiri Kosina
SUSE Labs, Novell Inc.
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