linux-kernel - Re: [PATCH] PM: Kconfig: Set PM_RUNTIME if PM_SLEEP is selected (was: Re: [PATCH] PM / domains: Kconfig: always enable PM

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Message-ID: <20141118083411.GB4059@amd>
Date:	Tue, 18 Nov 2014 09:34:11 +0100
From:	Pavel Machek <pavel@....cz>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Kevin Hilman <khilman@...nel.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Linux PM list <linux-pm@...r.kernel.org>,
	linaro-kernel <linaro-kernel@...ts.linaro.org>,
	Grygorii Strashko <grygorii.strashko@...com>,
	Len Brown <len.brown@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>
Subject: Re: [PATCH] PM: Kconfig: Set PM_RUNTIME if PM_SLEEP is selected
 (was: Re: [PATCH] PM / domains: Kconfig: always enable PM_RUNTIME when genpd
 enabled)

On Tue 2014-11-18 01:39:06, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> The number of and dependencies between high-level power management
> Kconfig options make life much harder than necessary.  Several
> conbinations of them have to be tested and supported, even though
> some of those combinations are very rarely used in practice (it
> they are used in practice at all).  Moreover, the fact that we
> have separate independent Kconfig options for runtime PM and
> system suspend is a serious obscacle for integration between
> the two frameworks.
> 
> To overcome these difficulties, always select PM_RUNTIME if PM_SLEEP
> is set.  Among other things, this will allow system suspend callbacks
> provided by bus types and device drivers to rely on the runtime PM
> framework regardless of the kernel configuration.

3.18-rc5 still has:

config PM_RUNTIME
        bool "Run-time PM core functionality"
        depends on !IA64_HP_SIM
        ---help---

So I assume this patch is against tree where PM_RUNTIME does not
depend on anything?

> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> ---
> 
> As a follow up.
> 
> Note that we won't need the patch making genpd select PM_RUNTIME with this,
> because genpd already depends on PM.

Looking through the config file, there are more config options that
should be stripped.

config SUSPEND_FREEZER
        bool "Enable freezer for suspend to RAM/standby" \
"Turning OFF this setting is NOT recommended! If in doubt, say Y."

config HIBERNATE_CALLBACKS
       bool

...can we just use CONFIG_HIBERNATE, instead?

> ===================================================================
> --- linux-pm.orig/kernel/power/Kconfig
> +++ linux-pm/kernel/power/Kconfig
> @@ -94,6 +94,7 @@ config PM_STD_PARTITION
>  config PM_SLEEP
>  	def_bool y
>  	depends on SUSPEND || HIBERNATE_CALLBACKS
> +	select PM_RUNTIME
>  
>  config PM_SLEEP_SMP
>  	def_bool y

								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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