linux-kernel - Re: Changes to sysfs PM layer break userspace

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Message-Id: <20061219194931.e2527895.akpm@osdl.org>
Date:	Tue, 19 Dec 2006 19:49:31 -0800
From:	Andrew Morton <akpm@...l.org>
To:	Randy Dunlap <randy.dunlap@...cle.com>
Cc:	David Brownell <david-b@...bell.net>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org, gregkh@...e.de
Subject: Re: Changes to sysfs PM layer break userspace

On Tue, 19 Dec 2006 18:35:39 -0800
Randy Dunlap <randy.dunlap@...cle.com> wrote:

> On Tue, 19 Dec 2006 18:15:24 -0800 Andrew Morton wrote:
> 
> > On Tue, 19 Dec 2006 13:34:49 -0800
> > David Brownell <david-b@...bell.net> wrote:
> > 
> > > Documentation/feature-removal-schedule.txt has warned about this since
> > > August
> > 
> > Nobody reads that.
> 
> Ugh, I read it.
> 
> > Please, wherever possible, put a nice printk("this is going away") in the code
> > when planning these things.
> 
> Can notices go in both places, or is in the source code (printk)
> now the preferred way?

I think printks grab a lot more attention.  It's not surprising that people
get surprised when the feature they're using goes away.

Plus they may not even know that that they're using the feature.  A printk
fixes that.

> I think that we can point people to Doc/feature-removal-schedule.txt
> easier (and more effectively) than we can source code (or noisy kernel
> logs).

Hopefully developers who see the printk will think to look in
feature-removal-schedule.txt for more details.

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