linux-kernel - Re: [PATCH v5] x86,cpu-hotplug: assign same CPU number to readded CPU

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Message-ID: <1410839798.5149.22.camel@marge.simpson.net>
Date:	Tue, 16 Sep 2014 05:56:38 +0200
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Toshi Kani <toshi.kani@...com>
Cc:	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com, bp@...en8.de,
	gong.chen@...ux.intel.com, tony.luck@...el.com, x86@...nel.org,
	imammedo@...hat.com, huawei.libin@...wei.com,
	paul.gortmaker@...driver.com, linux-kernel@...r.kernel.org,
	srivatsa.bhat@...ux.vnet.ibm.com, peterz@...radead.org,
	Wanpeng Li <wanpeng.li@...ux.intel.com>,
	Linn Crosetto <linn@...com>
Subject: Re: [PATCH v5] x86,cpu-hotplug: assign same CPU number to readded
 CPU

On Mon, 2014-09-15 at 10:44 -0600, Toshi Kani wrote: 
> On Mon, 2014-09-15 at 06:25 +0200, Mike Galbraith wrote:
> > On Thu, 2014-09-11 at 16:21 +0900, Yasuaki Ishimatsu wrote: 
> > > There is no response for two months since posting v4.
> > > What can I do for pushing the patch to upstream?
> > 
> > Looks to me like we have two patches floating about for more or less the
> > same problem, this one, and...
> > 
> > https://lkml.org/lkml/2014/7/29/159
> > 
> > ..this one, which you reviewed, and HP both reviewed and tested.
> > 
> > We seem to kinda stuck with Boris having said don't diddle the
> > cpu_llc_shared_map, but HP/Intel saying that this map diddling fixes
> > their explosions.  If your alternative is preferred over diddling
> > cpu_llc_shared_map, perhaps HP/Intel can test/confirm that their
> > explosions stay gone? 
> 
> Well, Boris mentioned later in his email:
> https://lkml.org/lkml/2014/7/22/201
> 
> And I agree with his assessment that both patches make sense.  

Nonetheless, this just reeks of "department of redundancy department".
I have nothing against doing both really, but it does leave me wondering
if we would not then be merging the mask clearing "just because".

-Mike

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