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

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Message-ID: <20120412030425.GL6589@ZenIV.linux.org.uk>
Date:	Thu, 12 Apr 2012 04:04:25 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Kay Sievers <kay@...y.org>, Ted Ts'o <tytso@....edu>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Konstantin Khlebnikov <khlebnikov@...nvz.org>,
	Greg Kroah-Hartman <gregkh@...ux-foundation.org>,
	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Subject: Re: RFC: deprecating/removing the legacy mode of devpts

On Wed, Apr 11, 2012 at 07:48:44PM -0700, H. Peter Anvin wrote:
> The symlink support is at least 3 years old, probably more.

DEVPTS_MULTIPLE_INSTANCES wasn't anywhere near mandatory all that time...
Kernel upgrade procedure that starts with "build the old kernel with
that option enabled, boot it, replace /dev/ptmx with a symlink, then
never try to boot earlier kernel images.  Now you can safely upgrade
to current kernel" is the recipe for massive self-LARTs (and resulting
pitchfork crowds).
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