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 15:28:36 -0400
From:	Waiman Long <Waiman.Long@...com>
To:	Ingo Molnar <mingo@...nel.org>
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

On 04/17/2013 03:18 AM, Ingo Molnar wrote:
> * 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.

I have sent out a new series (v4) with the requested changes. Please let 
me know what else do you think I need to do.

Regards,
Longman
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