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PM: Provide a config snippet for disabling PM

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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@kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Mark Brown 2017-11-29 11:12:27 +00:00 committed by Rafael J. Wysocki
parent ae64f9bd1d
commit 4ab53fe612
2 changed files with 16 additions and 0 deletions
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@ -10890,6 +10890,7 @@ 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@arm.com>

15
kernel/configs/nopm.config Normal file
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@ -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