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

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Date:	Wed, 8 Jan 2014 22:37:36 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Stephen Boyd <sboyd@...eaurora.org>,
	Mark Rutland <mark.rutland@....com>,
	devicetree@...r.kernel.org, Russell King <linux@....linux.org.uk>,
	linux-arm-msm@...r.kernel.org,
	Rohit Vaswani <rvaswani@...eaurora.org>,
	linux-kernel@...r.kernel.org, Kumar Gala <galak@...eaurora.org>,
	David Brown <davidb@...eaurora.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Subject: Re: [PATCH v2 0/9] CPU enable method based SMP/hotplug + MSM conversion

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.

	Arnd
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