linux-kernel - Re: [PATCH v2 0/9] CPU enable method based SMP/hotplug + MSM conversion

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Message-Id: <463D867F-6EF1-40E4-8AFB-28E54433CD79@codeaurora.org>
Date:	Thu, 23 Jan 2014 16:04:28 -0600
From:	Kumar Gala <galak@...eaurora.org>
To:	Olof Johansson <olof@...om.net>, Arnd Bergmann <arnd@...db.de>,
	Kevin Hilman <khilman@...aro.org>
Cc:	linux-arm-kernel@...ts.infradead.org,
	Mark Rutland <mark.rutland@....com>,
	devicetree <devicetree@...r.kernel.org>,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	Russell King <linux@....linux.org.uk>,
	linux-arm-msm@...r.kernel.org,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Rohit Vaswani <rvaswani@...eaurora.org>,
	linux-kernel@...r.kernel.org, David Brown <davidb@...eaurora.org>,
	Stephen Boyd <sboyd@...eaurora.org>
Subject: Re: [PATCH v2 0/9] CPU enable method based SMP/hotplug + MSM conversion


On Jan 8, 2014, at 7:50 PM, Stephen Boyd <sboyd@...eaurora.org> wrote:

> On 01/08/14 13:37, Arnd Bergmann wrote:
>> On Tuesday 24 December 2013, Stephen Boyd wrote:
>>> This is a rework of patches sent a months back by Rohit[1].
>>> The goal of these patches is to add support for SMP and (basic)
>>> hotplug on MSM based SoCs. To get there, we add support for a
>>> generic way to hook in SMP/hotplug support code based on DT. To
>>> show how it's used, we convert the MSM8660 SMP support code over
>>> to the new method. After that we add support for the rest of the
>>> upstream MSM SoCs (note these patches are piled high on top of
>>> Rohit's patches to add 8074 support to MSM[2] and my follow ups[3,4],
>>> but this should only matter to the MSM maintainers).
>>> 
>>> This is one of the last items of code that still requires us to have
>>> a mach directory and a machine descriptor. We should be able to move
>>> the hotplug/smp code out of mach directories if this approach is
>>> accepted.
>> The implementation looks ok to me, but I wonder whether on a global
>> scale we want to tie it more closely to the cpuidle implementations.
>> We already have a drivers/cpuidle framework, and while I admit
>> that I'm not familiar with the code in there, I would assume that
>> the smp operations and the cpuidle code usually go hand in hand.
> 
> Sure. Right now the smp ops code is fairly well tied into the arch layer
> so it sounds like there is some future work when we move this stuff out
> of the mach directory.
> 
> Would arm-soc be able to pick these patches up for 3.14? I think
> everything is in place for these patches now that Mark has reviewed them.

Ping, wondering if arm-soc would pick up:

 ARM: Introduce CPU_METHOD_OF_DECLARE() for cpu hotplug/smp

The other patches are all msm specific so we can handle them through the normal channels.

- k

-- 
Employee of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation

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