linux-kernel - Re: [PATCH] PM: Provide a config snippet for disabling PM

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Date:   Wed, 29 Nov 2017 15:37:01 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Mark Brown <broonie@...nel.org>
Cc:     "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Kevin Hilman <khilman@...libre.com>,
        Fengguang Wu <fengguang.wu@...el.com>
Subject: Re: [PATCH] PM: Provide a config snippet for disabling PM

On Wed, Nov 29, 2017 at 12:12 PM, Mark Brown <broonie@...nel.org> wrote:
> A frequent source of build problems is poor handling of optional PM
> support, almost all development is done with the PM options enabled
> but they can be turned off.  Currently few if any of the build test
> services do this as standard as there is no standard config for it and
> the use of selects and def_bool means that simply setting CONFIG_PM=n
> doesn't do what is expected.  To make this easier provide a fragement
> that can be used with KCONFIG_ALLCONFIG to force PM off.
>
> CONFIG_XEN is disabled as Xen uses hibernation callbacks which end up
> turning on power management on architectures with Xen.  Some cpuidle
> implementations on ARM select PM so CONFIG_CPU_IDLE is disabled, and
> some ARM architectures unconditionally enable PM so they are also
> disabled.
>
> Signed-off-by: Mark Brown <broonie@...nel.org>

I'm going to apply this shortly, sorry for the delay.

> ---
>  MAINTAINERS                |  1 +
>  kernel/configs/nopm.config | 15 +++++++++++++++
>  2 files changed, 16 insertions(+)
>  create mode 100644 kernel/configs/nopm.config
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 07d9067f68fd..539808dc7928 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -10895,6 +10895,7 @@ F:      include/linux/pm.h
>  F:     include/linux/pm_*
>  F:     include/linux/powercap.h
>  F:     drivers/powercap/
> +F:     kernel/configs/nopm.config
>
>  POWER STATE COORDINATION INTERFACE (PSCI)
>  M:     Mark Rutland <mark.rutland@....com>
> diff --git a/kernel/configs/nopm.config b/kernel/configs/nopm.config
> new file mode 100644
> index 000000000000..81ff07863576
> --- /dev/null
> +++ b/kernel/configs/nopm.config
> @@ -0,0 +1,15 @@
> +CONFIG_PM=n
> +CONFIG_SUSPEND=n
> +CONFIG_HIBERNATION=n
> +
> +# Triggers PM on OMAP
> +CONFIG_CPU_IDLE=n
> +
> +# Triggers enablement via hibernate callbacks
> +CONFIG_XEN=n
> +
> +# ARM/ARM64 architectures that select PM unconditionally
> +CONFIG_ARCH_OMAP2PLUS_TYPICAL=n
> +CONFIG_ARCH_RENESAS=n
> +CONFIG_ARCH_TEGRA=n
> +CONFIG_ARCH_VEXPRESS=n
> --
> 2.15.0
>