linux-kernel - Re: [Regression] kdesu broken

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Message-ID: <alpine.LFD.2.01.0907240930120.3960@localhost.localdomain>
Date:	Fri, 24 Jul 2009 09:34:35 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
cc:	"Rafael J. Wysocki" <rjw@...k.pl>, Ray Lee <ray-lk@...rabbit.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [Regression] kdesu broken



On Fri, 24 Jul 2009, Alan Cox wrote:

> On Fri, 24 Jul 2009 17:21:45 +0200
> "Rafael J. Wysocki" <rjw@...k.pl> wrote:
> 
> > On Friday 24 July 2009, Ray Lee wrote:
> > > On Thu, Jul 23, 2009 at 4:45 PM, Rafael J. Wysocki<rjw@...k.pl> wrote:
> > > > A recent kernel change broke kdesu (from KDE 4.2) on my test boxes.  ISTR a
> > > > discussion about that, but I can't find it right now.  Any clues?
> > > 
> > > See the thread starting here: ("possible regression with pty.c commit")
> > >    http://lkml.org/lkml/2009/7/11/125
> > 
> > Thanks for the pointer.
> > 
> > Well, I thought we were expected to avoid breaking existing user space, even
> > if that were buggy etc.
> 
> I don't know where you got that idea from. Avoiding breaking user space
> unneccessarily is good but if its buggy you often can't do anything about
> it.

Alan, he got that idea from me.

We don't do regressions. If user space depended on old behavior, we don't 
change behavior.

And regardless of that, I do not think EIO is the right thing to return at 
all. If the other side of a pty went away, return 0 and possibly send a 
HUP, or whatever. What did we do before?

			Linus
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