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

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Message-Id: <4D2D856B-AE62-49D6-9ABE-5238E8B23A6C@mit.edu>
Date:	Sun, 8 Apr 2012 23:15:07 -0400
From:	Theodore Tso <tytso@....EDU>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Theodore Tso <tytso@....edu>, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Konstantin Khlebnikov <khlebnikov@...nvz.org>,
	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


On Apr 8, 2012, at 6:45 PM, H. Peter Anvin wrote:

> On 04/08/2012 03:46 PM, Alan Cox wrote:
>>> What if it turns out we can make udev/devtmpfs make this happen
>>> transparently (which it sounds like it might be possible)?  Would you be
>>> okay with removing the "implicit bind mount" property of the current
>>> devpts then?
>> 
>> Once we get to the point where it "just works" I'm quite happy for that
>> to happen unless it turns out there's any large code size/performance
>> hits in having the feature always on. I don't see any.
>> 
> 
> No, it's actually the other way around... it lets us take some pretty
> nice shortcuts.

If it requires making changes to udev, can we place make sure have
a decent amount of time before we remove code from the kernel? 
I really hate it when people break userspace for the convenience
of kernel programmers.   As I recall Linus had something to say
about that….

-- Ted


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