[ACPI] remove "default m" from acpi/Kconfig

Andi Kleen suggested it was unconventional for us to "default m"
on ACPI modules -- even though they are expected to be deployed
as modules.  But as "default n" would likely result in some
users building nonsense kernels, we compromise to "default y".

Distros are expected to continue to use =m in their configs.

Signed-off-by: Len Brown <len.brown@intel.com>

diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 1117358..83cac52 100644 (file)
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -80,16 +80,16 @@ config ACPI_SLEEP_PROC_SLEEP
 config ACPI_AC
        tristate "AC Adapter"
        depends on X86
-       default m
+       default y
        help
          This driver adds support for the AC Adapter object, which indicates
-         whether a system is on AC, or not.  Typically, only mobile systems 
-         have this object, since desktops are always on AC.
+         whether a system is on AC, or not. If you have a system that can
+         switch between A/C and battery, say Y.
 
 config ACPI_BATTERY
        tristate "Battery"
        depends on X86
-       default m
+       default y
        help
          This driver adds support for battery information through
          /proc/acpi/battery. If you have a mobile system with a battery, 
@@ -97,18 +97,17 @@ config ACPI_BATTERY
 
 config ACPI_BUTTON
        tristate "Button"
-       default m
+       default y
        help
-         This driver registers for events based on buttons, such as the
-         power, sleep, and lid switch.  In the future, a daemon will read
-         /proc/acpi/event and perform user-defined actions such as shutting
-         down the system.  Until then, you can cat it, and see output when
-         a button is pressed.
+         This driver handles events on the power, sleep and lid buttons.
+         A daemon reads /proc/acpi/event and perform user-defined actions
+         such as shutting down the system.  This is necessary for
+         software controlled poweroff.
 
 config ACPI_VIDEO
        tristate "Video"
        depends on X86
-       default m
+       default y
        help
          This driver implement the ACPI Extensions For Display Adapters
          for integrated graphics devices on motherboard, as specified in
@@ -129,18 +128,19 @@ config ACPI_HOTKEY
 
 config ACPI_FAN
        tristate "Fan"
-       default m
+       default y
        help
          This driver adds support for ACPI fan devices, allowing user-mode 
          applications to perform basic fan control (on, off, status).
 
 config ACPI_PROCESSOR
        tristate "Processor"
-       default m
+       default y
        help
          This driver installs ACPI as the idle handler for Linux, and uses
          ACPI C2 and C3 processor states to save power, on systems that
-         support it.
+         support it.  It is required by several flavors of cpufreq
+         Performance-state drivers.
 
 config ACPI_HOTPLUG_CPU
        bool
@@ -151,7 +151,7 @@ config ACPI_HOTPLUG_CPU
 config ACPI_THERMAL
        tristate "Thermal Zone"
        depends on ACPI_PROCESSOR
-       default m
+       default y
        help
          This driver adds support for ACPI thermal zones.  Most mobile and
          some desktop systems support ACPI thermal zones.  It is HIGHLY
@@ -167,7 +167,7 @@ config ACPI_NUMA
 config ACPI_ASUS
         tristate "ASUS/Medion Laptop Extras"
        depends on X86
-       default m
+       default y
         ---help---
           This driver provides support for extra features of ACPI-compatible
           ASUS laptops. As some of Medion laptops are made by ASUS, it may also
@@ -196,7 +196,7 @@ config ACPI_ASUS
 config ACPI_IBM
        tristate "IBM ThinkPad Laptop Extras"
        depends on X86
-       default m
+       default y
        ---help---
          This is a Linux ACPI driver for the IBM ThinkPad laptops. It adds
          support for Fn-Fx key combinations, Bluetooth control, video
@@ -209,7 +209,7 @@ config ACPI_IBM
 config ACPI_TOSHIBA
        tristate "Toshiba Laptop Extras"
        depends on X86
-       default m
+       default y
        ---help---
          This driver adds support for access to certain system settings
          on "legacy free" Toshiba laptops.  These laptops can be recognized by
@@ -296,7 +296,7 @@ config X86_PM_TIMER
        bool "Power Management Timer Support"
        depends on X86
        depends on !X86_64
-       default n
+       default y
        help
          The Power Management Timer is available on all ACPI-capable,
          in most cases even if ACPI is unusable or blacklisted.