linux-kernel - Re: [GIT, RFC] Killing the Big Kernel Lock

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Date:	Sat, 27 Mar 2010 15:37:38 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Stefan Richter <stefanr@...6.in-berlin.de>
Cc:	Jiri Kosina <jkosina@...e.cz>,
	Frederic Weisbecker <fweisbec@...il.com>,
	linux-kernel@...r.kernel.org, Matthew Wilcox <matthew@....cx>,
	Thomas Gleixner <tglx@...utronix.de>, jblunck@...e.de,
	Alan Cox <alan@...ux.intel.com>, Ingo Molnar <mingo@...e.hu>,
	John Kacur <jkacur@...hat.com>
Subject: Re: [GIT, RFC] Killing the Big Kernel Lock

On Saturday 27 March 2010 00:47:33 Stefan Richter wrote:

> firewire-core and raw1394 do not actually require the BKL, they only
> miss to declare their files as not seekable.  I will post patches which
> change these accordingly.
> 
> My guess is that there is nothing to seek in dv1394, video1394, and
> firedtv either.
> 
> Needless to say, there may be other character device file interfaces
> which cannot be seeked but don't admit it yet.
> 

Your patches look good, but it would be helpful to also set .llseek = no_llseek
in the file operations, because that is much easier to grep for than
only the nonseekable_open. While it's technically a NOP on the presence of
nonseekable_open, it will help that I don't accidentally apply my patch on
top of yours.

	Arnd
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