linux-kernel - Re: [PATCH 11/31] Constify struct file

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Date:	Sun, 6 Dec 2009 09:25:26 -0800
From:	Greg KH <gregkh@...e.de>
To:	Emese Revfy <re.emese@...il.com>
Cc:	lenb@...nel.org, astarikovskiy@...e.de, mchehab@...radead.org,
	linville@...driver.com, miklos@...redi.hu, davem@...emloft.net,
	rostedt@...dmis.org, fweisbec@...il.com, mingo@...hat.com,
	avi@...hat.com, mtosatti@...hat.com, torvalds@...ux-foundation.org,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 11/31] Constify struct file_operations for 2.6.32 v1

On Sun, Dec 06, 2009 at 02:47:44AM +0100, Emese Revfy wrote:
> Greg KH wrote:
> > On Sat, Dec 05, 2009 at 03:50:23AM +0100, Emese Revfy wrote:
> >> Greg KH wrote:
> >>> On Sat, Dec 05, 2009 at 01:02:59AM +0100, Emese Revfy wrote:
> >>>> -static struct file_operations ptmx_fops;
> >>>> +static const struct file_operations ptmx_fops = {
> >>>> +	.llseek		= no_llseek,
> >>>> +	.read		= tty_read,
> >>>> +	.write		= tty_write,
> >>>> +	.poll		= tty_poll,
> >>>> +	.unlocked_ioctl	= tty_ioctl,
> >>>> +	.compat_ioctl	= tty_compat_ioctl,
> >>>> +	.open		= ptmx_open,
> >>>> +	.release	= tty_release,
> >>>> +	.fasync		= tty_fasync,
> >>>> +};
> >>> You just made these functions all global, for no real good reason.  Why
> >>> did you do this?
> >> I think this is the only way to make ptmx_fops const, provided we want to. 
> > 
> > Why do we want to?
> 
> Because I saw that checkpatch.pl itself tries to ensure the same I went
> through the whole tree looking for non-const file_operations structures
> and tried to make them const as best as I could. If you think making
> ptmx_fops const is not worth the effort I will remove it from the patch.

Based on the patch, I would think it is not worth it.

thanks,

greg k-h
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