linux-kernel - Re: [PATCH 06/11] pps: serial clients support.

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Date:	Thu, 3 Dec 2009 11:46:41 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Rodolfo Giometti <giometti@...eenne.com>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Dave Jones <davej@...hat.com>, Sam Ravnborg <sam@...nborg.org>,
	Greg KH <greg@...ah.com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Kay Sievers <kay.sievers@...y.org>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH 06/11] pps: serial clients support.

> > I think putting the pps ldisc (which is basically n_tty and a bit) into
> > n_tty is probably the right choice given how small and clean it is - what
> > do you think ?
> 
> I think it could be ok, but in this case where should I register
> pps-ldisc? Into tty_ldisc_begin just after tty_ldisc_N_TTY?

Yes.

> Again, should I remove the possibility to compile pps-ldisc as module?

It would do that yes. I hadn't considered that aspect of it - and that in
turn would force you to compile the core PPS support in to get pps-ldisc.

How about this then (I'm trying to see a way to avoid all thsoe exports
of functions)

/**
 *	n_tty_inherit_ops		-	initialise ldisc ops
 *	@ops: ops to initialise
 *
 *	Allow a line discipline to inherit the basic operations
 *	from the n_tty line discipline. The caller must set up
 *	its own ldisc number, flags and name. It must use the
 *	inherited value of magic.
 */

void n_tty_init_ops(struct tty_ldisc_ops *ops)
{
	*ops = tty_ldisc_N_TTY;
	ops->owner = NULL:
	ops->refcount = ops->flags = 0;
}
EXPORT_SYMBOL_GPL(n_tty_inherit_ops);

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