[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 [off-list ref] wrote:

quoted

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 <redacted>

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