Re: [PATCH 0/4] PM: Use CONFIG_PM instead of CONFIG_PM_RUNTIME in core code

From: Ulf Hansson
Date: Thu Nov 27 2014 - 04:20:14 EST

On 27 November 2014 at 09:57, Ulf Hansson <ulf.hansson@xxxxxxxxxx> wrote:
> On 27 November 2014 at 01:37, Rafael J. Wysocki <rjw@xxxxxxxxxxxxx> wrote:
>> Hi,
>> After commit b2b49ccbdd54 "PM: Kconfig: Set PM_RUNTIME if PM_SLEEP is
>> selected" (currently in Linux next) CONFIG_PM_RUNTIME is set whenever
>> CONFIG_PM is set, so CONFIG_PM can be used in #ifdefs instead of
>> CONFIG_PM_RUNTIME which simplifies things in quite a few cases.
>> For this reason, the following patches modify some core code to use
>> [1/4] Drop a macro which is redundant after the above commit.
>> [2/4] Use PM instead of PM_RUNTIME in the core device PM code.
>> [3/4] Use PM instead of PM_RUNTIME in the ACPI core.
>> [4/4] Use PM instead of PM_RUNTIME in the PCI core.
>> They build for me for all of the relevant combinations of options (on x86),
>> but more testing (on the other architectures) would be welcome.
> I really like the looks of this patchset!
> Noticed that you have applied it for your bleeding edge branch, I
> suppose that means you will get some "free" testing in linux-next?
> Anyway, I have tested it for ux500 (including the genpd support for
> it, available in linux-next). It works nicely!
> I have also tested the two Kconfig options; CONFIG_PM_SLEEP (which
> selects CONFIG_PM_RUNTIME) and for CONFIG_PM_RUNTIME (with
> That brings me to a raise a question; why do we need to keep these two
> configurations options? Couldn't we also have CONFIG_PM_RUNTIME to
> select CONFIG_PM_SLEEP, that will further simplify things?

I had look at it. Do you think the below approach could work?

I guess the questions is if there are some configurations that use
CONFIG_PM_RUNTIME but not CONFIG_PM_SLEEP. And if so, should we care?

diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig
index 6e7708c..425f83a 100644
--- a/kernel/power/Kconfig
+++ b/kernel/power/Kconfig
@@ -94,7 +94,6 @@ config PM_STD_PARTITION
config PM_SLEEP
def_bool y
- select PM_RUNTIME

def_bool y
@@ -131,21 +130,12 @@ config PM_WAKELOCKS_GC
default y

- bool "Run-time PM core functionality"
- ---help---
- Enable functionality allowing I/O devices to be put into energy-saving
- (low power) states at run time (or autosuspended) after a specified
- period of inactivity and woken up in response to a hardware-generated
- wake-up event or a driver's request.
- Hardware support is generally required for this functionality to work
- and the bus type drivers of the buses the devices are on are
- responsible for the actual handling of the autosuspend requests and
- wake-up events.
+ def_bool y
+ depends on PM_SLEEP

config PM
def_bool y
- depends on PM_SLEEP || PM_RUNTIME
+ depends on PM_SLEEP

Kind regards
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