linux-kernel - Re: [PATCH] sony_pi: Remove the BKL from sonypi_misc

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Message-ID: <20091021213139.GC4880@nowhere>
Date:	Wed, 21 Oct 2009 23:31:42 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Arnd Bergmann <arndbergmann@...glemail.com>
Cc:	John Kacur <jkacur@...hat.com>, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH] sony_pi: Remove the BKL from sonypi_misc_open

On Tue, Oct 20, 2009 at 12:08:57AM +0200, Arnd Bergmann wrote:
> On Tuesday 20 October 2009, Arnd Bergmann wrote:
> > On Monday 19 October 2009, John Kacur wrote:
> > > How does this look? (Version 2 of the patch follows)
> > 
> > Looks good now.
> > 
> 
> A bit of background:
> 
> Doing only one of the two conversions is a correct patch as well
> of course, I just want to make sure you don't have to go through all
> the same files again once someone does a blind pushdown into the ioctl
> and llseek functions, so once you prove that a specific driver doesn't
> need the BKL, please always make sure to remove it from all three places.
> 
> I fear that the llseek part will get interesting as well, just because
> we call default_llseek instead of no_ll by default currently.
> It might be a good idea to add one of .llseek=no_llseek or 
> .llseek=generic_file_llseek in any file_operations that you prove
> to not require the BKL.
> 
> 	Arnd <><


What about a pusdown of default_lseek attribution for these
fops that don't have any llseek() (and rename it to
deprecated_default_lseek() )

Because we can probably fix these fops one by one but what
about the next drivers that will have no llseek() ?

We can't attribute default_llseek() by default anymore for
further fops that are to come.

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