linux-kernel - [PATCH 0/5] Re: Remove CONFIG_PM altogether, enable power management all the time

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Date:	Tue, 8 Feb 2011 22:18:27 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Len Brown <len.brown@...el.com>,
	Alan Stern <stern@...land.harvard.edu>,
	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	linux-embedded@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH 0/5] Re: Remove CONFIG_PM altogether, enable power management all the time

On Tuesday, February 08, 2011, Ingo Molnar wrote:
> 
> * Rafael J. Wysocki <rjw@...k.pl> wrote:
> 
> > I'd appreciate it if people could review/test it and drop their comments.
> > 
> > Thanks,
> > Rafael
> > 
> > ---
> >  arch/x86/xen/Kconfig               |    2 +-
> >  drivers/acpi/Kconfig               |    1 -
> >  drivers/acpi/bus.c                 |    4 +---
> >  drivers/acpi/internal.h            |    6 ++++++
> >  drivers/acpi/sleep.c               |   13 +++++++++++--
> >  drivers/base/power/Makefile        |    3 +--
> >  drivers/net/e1000e/netdev.c        |    8 ++++----
> >  drivers/net/pch_gbe/pch_gbe_main.c |    2 +-
> >  drivers/pci/pci-driver.c           |    4 ++--
> >  drivers/scsi/Makefile              |    2 +-
> >  drivers/scsi/scsi_priv.h           |    2 +-
> >  drivers/scsi/scsi_sysfs.c          |    2 +-
> >  drivers/usb/core/hcd-pci.c         |    4 ++--
> >  include/acpi/acpi_bus.h            |    2 +-
> >  include/linux/pm.h                 |    2 +-
> >  kernel/power/Kconfig               |   29 +++--------------------------
> >  16 files changed, 37 insertions(+), 49 deletions(-)
> 
> Ok, there's some real bang for bucks in this patch, nice! It's a beginning.
> 
> Reviewed-by: Ingo Molnar <mingo@...e.hu>

In the meantime I've split it into a series of patches that should make it a
bit easier to diagnose problems, if there are any.  I'll post those patches
in replies to this message:

[1/5] - Deal with dependencies on CONFIG_PM in ACPI
[2/5] - Redefine CONFIG_PM as (CONFIG_PM_SLEEP || CONFIG_PM_RUNTIME)
[3/5] - Reorder options in kernel/power/Kconfig
[4/5] - Replace CONFIG_PM_OPS with CONFIG_PM
[5/5] - Clean up dependencies in kernel/power/Kconfig

> Also, i've Cc:-ed Linus, to check whether the idea to make power management a 
> permanent, core portion of Linux has any obvious downsides we missed.
>
> Rafael, could you do a defconfig-ish x86 build with and without CONFIG_PM, and post 
> the 'size vmlinux' comparison - so that we can see the size difference? We make some 
> things CONFIG_EXPERT configurable just to enable folks who *really* want to cut down 
> on kernel size to configure it out.

Sure, I will.

Thanks,
Rafael
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