linux-kernel - Re: [PATCH v7 08/11] arm/arm64: Unexport restart handlers

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Message-ID: <54806F2A.7070107@roeck-us.net>
Date:	Thu, 04 Dec 2014 06:26:50 -0800
From:	Guenter Roeck <linux@...ck-us.net>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
CC:	Russell King <linux@....linux.org.uk>,
	Wim Van Sebroeck <wim@...ana.be>,
	Catalin Marinas <catalin.marinas@....com>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>,
	Linux Watchdog Mailing List <linux-watchdog@...r.kernel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Linux PM list <linux-pm@...r.kernel.org>,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	Tomasz Figa <t.figa@...sung.com>,
	Randy Dunlap <rdunlap@...radead.org>,
	Will Deacon <will.deacon@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Jonas Jensen <jonas.jensen@...il.com>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Heiko Stuebner <heiko@...ech.de>
Subject: Re: [PATCH v7 08/11] arm/arm64: Unexport restart handlers

On 12/04/2014 05:36 AM, Geert Uytterhoeven wrote:
> Hi Günther,
>
> On Wed, Aug 20, 2014 at 2:45 AM, Guenter Roeck <linux@...ck-us.net> wrote:
>> Implementing a restart handler in a module don't make sense
>> as there would be no guarantee that the module is loaded when
>> a restart is needed. Unexport arm_pm_restart to ensure that
>> no one gets the idea to do it anyway.
>
> Why not? I was just going to do that, but I got greeted by:
>

Because you should register a restart handler instead, like the other
drivers in the same directory now do.

> ERROR: "arm_pm_restart" [drivers/power/reset/rmobile-reset.ko] undefined!
>
> So now we have to make sure all reset drivers for a zillion different
> hardware devices are builtin, and can't be modular?
>
No. All those drivers need to do is to register a restart handler using
the API provided in the patch series.

Ultimately all restart handlers should do that and arm_pm_restart should
go away entirely. That was the point of the patch series.

Guenter

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