linux-kernel - Re: [PATCH 02/12] isdn: autoconvert trivial BKL users to private mutex

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Date:	Mon, 12 Jul 2010 20:35:40 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	arnd@...db.de
Cc:	linux-kernel@...r.kernel.org, jkacur@...hat.com,
	fweisbec@...il.com, isdn@...ux-pingi.de, netdev@...r.kernel.org
Subject: Re: [PATCH 02/12] isdn: autoconvert trivial BKL users to private
 mutex

From: Arnd Bergmann <arnd@...db.de>
Date: Sun, 11 Jul 2010 23:18:53 +0200

> All these files use the big kernel lock in a trivial
> way to serialize their private file operations,
> typically resulting from an earlier semi-automatic
> pushdown from VFS.
> 
> None of these drivers appears to want to lock against
> other code, and they all use the BKL as the top-level
> lock in their file operations, meaning that there
> is no lock-order inversion problem.
> 
> Consequently, we can remove the BKL completely,
> replacing it with a per-file mutex in every case.
> Using a scripted approach means we can avoid
> typos.
...
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Applied.
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