linux-kernel - Re: [PATCH 2/3, RFC] watchdog dev BKL pushdown

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Message-ID: <20080520100815.3010688b@core>
Date:	Tue, 20 May 2008 10:08:15 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Arnd Bergmann <arnd@...db.de>, Jonathan Corbet <corbet@....net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>,
	Alexander Viro <viro@....linux.org.uk>,
	linux-kernel@...r.kernel.org, Wim Van Sebroeck <wim@...ana.be>
Subject: Re: [PATCH 2/3, RFC] watchdog dev BKL pushdown

On Tue, 20 May 2008 02:20:56 -0400
Christoph Hellwig <hch@...radead.org> wrote:

> On Tue, May 20, 2008 at 01:14:23AM +0200, Arnd Bergmann wrote:
> > The Big Kernel Lock has been pushed down from chardev_open
> > to misc_open, this change moves it to the individual watchdog
> > driver open functions.
> > 
> > As before, the change was purely mechanical, most drivers
> > should actually not need the BKL.
> 
> Actually I'd prefer to fix this for real.  This single open stuff aswell
> as same set of ioctls are duplicated all over the watchdog drivers.  We'd
> be much better off introducing a simple watchdog layer that handles this
> plus proper locking and convert drivers over to it gradually.

In progress in two ways

- Wim was (is ?) working on a proper device layer

- I've cleaned up all the drivers and am now testing a watchdog
driver supporting library which is taking about 50% of the code out of
each driver I convert.

Alan
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