linux-kernel - Re: [patch 05/28] drivers: Remove BKL from drivers/char/misc.c

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Message-Id: <200910112124.00747.arnd@arndb.de>
Date:	Sun, 11 Oct 2009 21:24:00 +0200
From:	Arnd Bergmann <arndbergmann@...glemail.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Vincent Sanders <vince@...tec.co.uk>,
	John Kacur <jkacur@...hat.com>,
	Jonathan Corbet <corbet@....net>,
	Christoph Hellwig <hch@...radead.org>,
	"Greg Kroah-Hartman" <gregkh@...e.de>
Subject: Re: [patch 05/28] drivers: Remove BKL from drivers/char/misc.c

On Saturday 10 October 2009, Thomas Gleixner wrote:
> misc_open() is already serialized with misc_mtx. Remove the BKL
> locking which got there via the BKL pushdown.

This only works as long as all misc drivers also don't need the BKL
in /their/ open methods. I believe that we did a pushdown into them
last year, but new ones may have crept up.

I guess we really should have kill this one off back then, but somehow
it was forgotten about.

	Arnd <><
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