linux-kernel - Re: RFC: deprecating/removing the legacy mode of devpts

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Date:	Sun, 8 Apr 2012 23:18:41 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Kay Sievers <kay.sievers@...y.org>,
	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Subject: Re: RFC: deprecating/removing the legacy mode of devpts

> > As such, I would like to suggest the following:
> >
> > 1. For 3.5, add this to feature-removal.txt.
> > 2. For 3.6, remove CONFIG_DEVPTS_MULTIPLE_INSTANCES as a configuration
> >     option, and printk a warning if devpts is mounted without the
> >     "newinstance" option.
> > 3. For 3.9 remove the legacy support including support for a ptmx node
> >     outside the devpts filesystem.

Ok I'm putting my tty maintainers hat on at this point because nobody
seems to be listening

I'm NAKking this change, I'm NAKking the feature-removal change.

If you want this to change convince the distributions there is a point in
supporting it. This is the *wrong* forum to force a cornercase feature
onto a bazillion users, and the wrong way to strongarm maintainers of the
relevant user space.

If udev has a problem handling it nicely because of the way the link is
generated then *fix that problem* so udev automatically gets both cases
right. If need be we can add more messages to udev to tell it what is
expected and what devtmpfs should produce.

Alan
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