linux-kernel - Re: [PATCH v3 5/5] mutex: Move mutex spinning code from sched/core.c back to mutex.c

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Date:	Wed, 17 Apr 2013 09:18:27 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Waiman Long <Waiman.Long@...com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	David Howells <dhowells@...hat.com>,
	Dave Jones <davej@...hat.com>,
	Clark Williams <williams@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org, x86@...nel.org,
	linux-arch@...r.kernel.org,
	"Chandramouleeswaran, Aswin" <aswin@...com>,
	Davidlohr Bueso <davidlohr.bueso@...com>,
	"Norton, Scott J" <scott.norton@...com>,
	Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH v3 5/5] mutex: Move mutex spinning code from sched/core.c
 back to mutex.c


* Waiman Long <Waiman.Long@...com> wrote:

> As mentioned by Ingo, the SCHED_FEAT_OWNER_SPIN scheduler feature
> bit was really just an early hack to make with/without mutex-spinning
> testable. So it is no longer necessary.
> 
> This patch removes the SCHED_FEAT_OWNER_SPIN feature bit and move the
> mutex spinning code from kernel/sched/core.c back to kernel/mutex.c
> which is where they should belong.
> 
> Signed-off-by: Waiman Long <Waiman.Long@...com>
> ---
>  include/linux/sched.h   |    4 ---
>  kernel/mutex.c          |   62 ++++++++++++++++++++++++++++++++++++++++++++++
>  kernel/sched/core.c     |   63 -----------------------------------------------
>  kernel/sched/features.h |    7 -----
>  4 files changed, 62 insertions(+), 74 deletions(-)

Please move this patch first in the series - so that later, functional patches are 
easier to revert, should the need arise. When possible we sort patches by risk: 
low risk ones first, riskier come later.

Thanks,

	Ingo
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