Fixed compile issue when disabling tegra hotplug

Change-Id: Ia5ff25414fa50289c521b663ea2f2d8f0ef4760d
arm: Add auto hotplug driver

This driver is simple and cheap and aims to avoid unnecessary hotplug
events and unnecessary task migrations. The design is simple. The value
of nr_running() (which is the current number of runnable threads) is
averaged over X samples by a ringbuffer. If the value is over a
dynamically calculated value, all CPUs are onlined. When the value falls
under another dynamically calculated value, the CPUs are offlined with a
2 second delay. If there is persistent load on the system, the CPUs will
not continually thrash between onlining and offlining and continually
migrate tasks. The number of online CPUs will remain constant until the
load has dropped below the dynamically calculated value. The online and
offline values are dynamically scaled based on the number of CPUs
online, as is the sampling rate of the driver. This aims to reduce the
expense of the driver and also reduce the number of unless hotplug
transitions which could have been avoided had cpufreq been given the
chance to ramp the online CPUs up and deal with the load. This driver
will also offline secondary cores when the screen is turned off,
providing earlysuspend is available.

It also has a module param to set
the minimum number of online CPUs:
/sys/module/auto_hotplug/parameters/min_online_cpus
This value is ignored when the device enters earlysuspend, as the
secondary CPUs are all offlined, but is set again when the screen is
turned back on.
arm: auto hotplug - wrap all pr_info into the existing debug mode so we
don't spam the kernel log
auto_hotplug: enhancements

1) added module params so tuning an be adjusted in userspace and
debugging can easliy be enabled/disabled

/sys/module/auto_hotplug/parameters/debug
(N/Y - turn off/on debugging)

/sys/module/auto_hotplug/parameters/disable_load_threshold
(integer - load at which a CPU is disabled)

/sys/module/auto_hotplug/parameters/enable_load_threshold (integer -
load at which an extra CPU is enabled)

/sys/module/auto_hotplug/parameters/enable_all_load_threshold (integer -
load at wich all CPU's are enabled)

/sys/module/auto_hotplug/parameters/min_sampling_rate
(milliseconds, converted to jiffies at runtime)

2) lowered enable_load_threshold from 225 to 200 for a little more pep.

To-do: add get/set routines to keep values safe and in acceptable ranges
Auto Hotplug: adjusted timers

Change-Id: I1f9ee7f6b4b9871e571de48bca9783873ce1e611
smp: various patches backported from the 3.5 branch

Thomas Gleixner's generic-idle patches:

smp: Add task_struct argument to __cpu_up()
Preparatory patch to make the idle thread allocation for secondary
cpus generic.
http://git.kernel.org/?p=linux/kernel/git/tip/tip.git;a=commit;h=8239c25
f47d2b318156993b15f33900a86ea5e17

smp: Add generic smpboot facility
Start a new file, which will hold SMP and CPU hotplug related generic
infrastructure.
http://git.kernel.org/?p=linux/kernel/git/tip/tip.git;a=commit;h=38498a6
7aa2cf8c80754b8d304bfacc10bc582b5

smp: Provide generic idle thread allocation
All SMP architectures have magic to fork the idle task and to store it
for reusage when cpu hotplug is enabled. Provide a generic
infrastructure for it.
Create/reinit the idle thread for the cpu which is brought up in the
generic code and hand the thread pointer to the architecture code via
__cpu_up().
Note, that fork_idle() is called via a workqueue, because this
guarantees that the idle thread does not get a reference to a user
space VM. This can happen when the boot process did not bring up all
possible cpus and a later cpu_up() is initiated via the sysfs
interface. In that case fork_idle() would be called in the context of
the user space task and take a reference on the user space VM.
http://git.kernel.org/?p=linux/kernel/git/tip/tip.git;a=commit;h=29d5e04
76e1c4a513859e7858845ad172f560389

arm: Use generic idle thread allocation
http://git.kernel.org/?p=linux/kernel/git/tip/tip.git;a=commit;h=84ec6d5
796e095e2f8698bd2b5d33849ed26d9e2

Change-Id: I46d92c4595f2bf969b8afbb39f07cb7dd119f1b3
kernel configuration updates

- enabled tickless kernel mode
- disabled tegra auto hotplug
- enabled auto hotplug
- enabled dynamic frequency mode
- enabled smp idle thread support

Change-Id: I9f10e260184c4286dabe0545791bec10f0389340
Wifi: fix previous commit

Change-Id: I78335246a2b4f5ac835855ef9d96cb17f5189507