Revert "Reduced ram usage from logger"

This reverts commit 453335fdda85eacf3d7b6d73f30a586266ce5ade.
tegra: custom user voltage control

Original implementation from faux123 (which was based on Michael Huang's OMAP4460 work). Interface cleaned up, made more robust and secure.
tegra: add GPU clocks interface
tegra: add CPU_LP max_rate interface
mutex: Place lock in contended state after fastpath_lock failure

ARM recently moved to asm-generic/mutex-xchg.h for its mutex
implementation after the previous implementation was found to be missing
some crucial memory barriers. However, this has revealed some problems
running hackbench on SMP platforms due to the way in which the
MUTEX_SPIN_ON_OWNER code operates.

The symptoms are that a bunch of hackbench tasks are left waiting on an
unlocked mutex and therefore never get woken up to claim it. This boils
down to the following sequence of events:

        Task A        Task B        Task C        Lock value
0                                                     1
1       lock()                                        0
2                     lock()                          0
3                     spin(A)                         0
4       unlock()                                      1
5                                   lock()            0
6                     cmpxchg(1,0)                    0
7                     contended()                    -1
8       lock()                                        0
9       spin(C)                                       0
10                                  unlock()          1
11      cmpxchg(1,0)                                  0
12      unlock()                                      1

At this point, the lock is unlocked, but Task B is in an uninterruptible
sleep with nobody to wake it up.

This patch fixes the problem by ensuring we put the lock into the
contended state if we fail to acquire it on the fastpath, ensuring that
any blocked waiters are woken up when the mutex is released.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Chris Mason <chris.mason@fusionio.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: <stable@vger.kernel.org>
Reviewed-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/n/tip-6e9lrw2avczr0617fzl5vqb8@git.kernel.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Revert "GPU Default speed at 564MHz"

This reverts commit c917e773d5beb885ab844b0529c058904078f7a1.
tegra: add more UV abilities for EMC,GPU,CPU,LP
board/cpu-tegra3: make runnable thread as a compilation option
cpuquiet/governors/balanced: make runnable thread as a compilation option
SCHEDULER: Autogroup patch group by current user android UID instead of task ID
cpuquiet: Runnable threads governor

[perf] The runnable threads governor only looks at the average number of
runnables in the system to make a decision when bringing cores
offline/online. First pass; tweaks thresholds and delays to reduce
decision latency to about ~50-70ms per core (from ~100-150ms per core)

Change-Id: Idd3b268a74a8f56ad3fc0e5c7f388174d1b6611f
Signed-off-by: Sai Charan Gurrappadi <sgurrappadi@nvidia.com>
cpuquiet: Add notifiers for the runnables governor

The governor stops sampling whenever the device is busy and starts its
sampling loop when the device is free.

Change-Id: I6b4dae94a60f8091d34400028a8d1f58faa51380
Signed-off-by: Sai Charan Gurrappadi <sgurrappadi@nvidia.com>
drivers/cpuquiet/governors/runnable_threads: fix typo derp
Fix cpuquiet lge way
CPU hotplug, writeback: Don't call writeback_set_ratelimit() too often during hotplug

The CPU hotplug callback related to writeback calls writeback_set_ratelimit()
during every state change in the hotplug sequence. This is unnecessary
since num_online_cpus() changes only once during the entire hotplug operation.

So invoke the function only once per hotplug, thereby avoiding the
unnecessary repetition of those costly calculations.

Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
tegra: unlinked GPU
tegra: GPU OC to 520MHz
cpuquiet: make balanced as default gov