linux-kernel - Re: [PATCH v3 3/3] arm: kernel: implement cpuidle

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Message-ID: <20150727094507.GD7557@n2100.arm.linux.org.uk>
Date:	Mon, 27 Jul 2015 10:45:07 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc:	Jisheng Zhang <jszhang@...vell.com>,
	Will Deacon <Will.Deacon@....com>,
	Mark Rutland <Mark.Rutland@....com>,
	"daniel.lezcano@...aro.org" <daniel.lezcano@...aro.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"galak@...eaurora.org" <galak@...eaurora.org>,
	"agross@...eaurora.org" <agross@...eaurora.org>,
	"davidb@...eaurora.org" <davidb@...eaurora.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 3/3] arm: kernel: implement cpuidle_ops with psci
 backend

On Mon, Jul 27, 2015 at 10:16:02AM +0100, Lorenzo Pieralisi wrote:
> Yes, I would only ask you, if the plan above (which can be implemented
> in two steps) makes sense to you please consider accepting Mark's change
> to consolidate PSCI code into drivers/firmware/psci, it is a stepping stone
> without which the changes above can't happen, I will take charge of completing
> the move of CPUidle code and create the required shim layer into
> drivers to make this happen.

Why can't Jisheng Zhang base his patches on top of Mark's changes and
place the new file directly under drivers/ ?

Why do it as a two-step process with it first appearing in arch/arm,
and then having to generate another patch at a later date to move it
elsewhere.  That just creates more noise, and we should be avoiding
generating noise in arch/arm.

This is what Linus has said in his -rc4 release notes yesterday:

   Other than that issue, it's mostly drivers and networking.  USB, gpu,
   mmc, network drivers, sound. With some ARM noise (but even that is
   mostly driver-related: dts updates due to MMC fixes). And a few small
   filesystem fixes.

and we can infer from the phrase "ARM noise" that Linus' opinion of
arch/arm is still fairly low, and still doesn't regard the "churn" in
arch/arm as being useful.

-- 
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according to speedtest.net.
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