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Date: Fri, 27 Nov 2009 07:13:19 +0100
From: Ingo Molnar <mingo@elte.hu>
To: Tejun Heo <tj@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>,
       Steven Rostedt <rostedt@goodmis.org>,
       Fr??d??ric Weisbecker <fweisbec@gmail.com>,
       Stephen Rothwell <sfr@canb.auug.org.au>, linux-next@vger.kernel.org,
       linux-kernel@vger.kernel.org, Mike Galbraith <efault@gmx.de>,
       Thomas Gleixner <tglx@linutronix.de>, "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [PATCH 1/4 tip/sched/core] sched: rename preempt_notifier to
 sched_notifier and always enable it
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* Tejun Heo <tj@kernel.org> wrote:

> Hello,
> 
> 11/27/2009 02:46 PM, Ingo Molnar wrote:
> > Other code will benefit from it though, such as the page fault callbacks 
> > i already mentioned.
> > 
> > My position on this is rather clear: i want no new callbacks and no 
> > changes to callbacks in the scheduler until this situation is cleaned 
> > up. Five callback sites are _way_ too much - so if you want to add 
> > callbacks or change them, please clean it up and improve it first.
> 
> Even changes which cause no functional differences? [...]

Such as enabling preempt notifiers unconditionally? That's a functional 
change - it turns a so-far optional callback into an essentially 
mandatory one.

	Ingo