linux-kernel - Re: [PATCH 1/4 tip/sched/core] sched: rename preempt_notifier to sched

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Message-ID: <20091127062147.GB22149@elte.hu>
Date:	Fri, 27 Nov 2009 07:21:47 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Tejun Heo <tj@...nel.org>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Fr??d??ric Weisbecker <fweisbec@...il.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	Mike Galbraith <efault@....de>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH 1/4 tip/sched/core] sched: rename preempt_notifier to
 sched_notifier and always enable it


* Tejun Heo <tj@...nel.org> wrote:

> 11/27/2009 03:13 PM, Ingo Molnar wrote:
> >>> 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.
> 
> No, I'm not gonna do that.  Just patches to reorganize code so that 
> unnecessary conflicts won't occur.  There will be NO functional 
> changes.

Not without the other changes - which you want to do too, right? Please 
send all sched.c modifications via the scheduler tree. Going via other 
trees is fine when there's agreement by the maintainers - but this is 
one of the rare cases where that's not the case.

	Ingo
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