linux-kernel - Re: [patch 11/28] nvram: Drop the bkl from nvram

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Message-ID: <20091011214053.GD5486@nowhere>
Date:	Sun, 11 Oct 2009 23:40:55 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Arnd Bergmann <arndbergmann@...glemail.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Vincent Sanders <vince@...tec.co.uk>,
	John Kacur <jkacur@...hat.com>,
	Jonathan Corbet <corbet@....net>,
	Christoph Hellwig <hch@...radead.org>,
	Sven-Thorsten Dietrich <sven@...bigcorporation.com>,
	Alessio Igor Bogani <abogani@...ware.it>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Greg KH <gregkh@...e.de>
Subject: Re: [patch 11/28] nvram: Drop the bkl from nvram_llseek()

On Sun, Oct 11, 2009 at 11:08:10PM +0200, Frederic Weisbecker wrote:
> On Sun, Oct 11, 2009 at 09:31:40PM +0200, Arnd Bergmann wrote:
> > On Saturday 10 October 2009, Thomas Gleixner wrote:
> > > There is nothing to protect inside nvram_llseek(), the file
> > > offset doesn't need to be protected and nvram_len is only
> > > initialized from an __init path.
> > > 
> > > It's safe to remove the big kernel lock there.
> > > 
> > 
> > The generic_nvram driver still uses ->ioctl instead of ->unlocked_ioctl.
> > I guess it would be helpful to change that in the same series, so we
> > don't get the BKL back as soon as someone does a pushdown into the
> > remaining ioctl functions.
> > 
> > 	Arnd <><
> 
> 
> Right!
> I'll add that in a second patch.
> 
> I've completely forgotten this ioctl/unlocked_ioctl thing.


BTW, I was focusing on the lock_kernel() callsites in the kernel which
are around 626 (I've excluded reiserfs)

Now I'm adding the ioctl() sites too:

git-grep "\.ioctl *=" | grep -P "^\S+\.c" | wc -l
452

Hehe :)

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