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

From: Alan Cox
Date: Tue May 20 2008 - 05:27:20 EST

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

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