linux-kernel - Re: Subject: [PATCH] rtc: Explicitly set llseek to no

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Date:	Tue, 3 Nov 2009 15:48:00 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	John Kacur <jkacur@...hat.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Vincent Sanders <vince@...tec.co.uk>,
	Jonathan Corbet <corbet@....net>,
	Christoph Hellwig <hch@...radead.org>,
	Arnd Bergmann <arndbergmann@...glemail.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: Subject: [PATCH] rtc: Explicitly set llseek to no_llseek

On Wed, 21 Oct 2009 23:13:26 +0200 (CEST)
John Kacur <jkacur@...hat.com> wrote:

> >From e1b7175258b33da3b0564ef04a0b1956f04f0cc7 Mon Sep 17 00:00:00 2001
> From: John Kacur <jkacur@...hat.com>
> Date: Wed, 21 Oct 2009 23:10:30 +0200
> Subject: [PATCH] rtc: Explicitly set llseek to no_llseek
> 
> Now that we've removed the BKL here, lets explicitly set llseek to no_llseek
> since the default llseek is not used here.
> 

I don't understand.

> 
> diff --git a/drivers/char/efirtc.c b/drivers/char/efirtc.c
> index 26a47dc..53c524e 100644
> --- a/drivers/char/efirtc.c
> +++ b/drivers/char/efirtc.c
> @@ -285,6 +285,7 @@ static const struct file_operations efi_rtc_fops = {
>  	.unlocked_ioctl	= efi_rtc_ioctl,
>  	.open		= efi_rtc_open,
>  	.release	= efi_rtc_close,
> +	.llseek		= no_llseek,
>  };
>  
>  static struct miscdevice efi_rtc_dev= {

What has this change to do with the BKL?
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