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

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Date:	Thu, 04 Dec 2014 06:51:49 -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 06:44 AM, Geert Uytterhoeven wrote:
> Hi Günther,
>
> On Thu, Dec 4, 2014 at 3:26 PM, Guenter Roeck <linux@...ck-us.net> wrote:
>> On 12/04/2014 05:36 AM, Geert Uytterhoeven wrote:
>>> 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.
>
> That's a different thing. "there would be no guarantee that the module is
> loaded when a restart is needed" is also valid for restart handlers...
>

Not really, because you are supposed to unregister the restart handler
on unload. Sure, you can instead clear arm_pm_reastart and leave the system
with no means to restart ...

Guenter

>>> 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.
>
> Good. That's what I'm doing right know ;-)
>
> Gr{oetje,eeting}s,
>
>                          Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
>
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                  -- Linus Torvalds
>

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