cpufreq: interactive: adjust load for changes in speed

Add notifier for speed transitions.  Keep a count of CPU active
microseconds times current frequency, converted to a percentage relative
to the current frequency when load is evaluated.

Change-Id: I5c27adb11081c50490219784ca57cc46e97fc28c
Signed-off-by: Todd Poynor <toddpoynor@google.com>
cpufreq: interactive: specify duration of CPU speed boost pulse

Sysfs attribute boostpulse_duration specifies the duration of boosting CPU
speed in response to bootpulse events.  Duration is specified in usecs,
default 80ms.

Change-Id: Ifd41625574891a44f1787a4e85d1e7b4f2afb52b
Signed-off-by: Todd Poynor <toddpoynor@google.com>
hardlockup: detect hard lockups without NMIs using secondary cpus

Emulate NMIs on systems where they are not available by using timer
interrupts on other cpus.  Each cpu will use its softlockup hrtimer
to update a per-cpu timestamp and then check the timestamp on the
next cpu.

The emulation uses the softlockup threshold instead of the hardlockup
threshold because the implementation runs at the same resolution as
the softlockup detector.

This patch is useful on systems where the hardlockup detector is not
available due to a lack of NMIs, for example most ARM SoCs.
Without this patch any cpu stuck with interrupts disabled can
cause a hardware watchdog reset with no debugging information,
but with this patch the kernel can detect the lockup and panic,
which can result in useful debugging info.

Change-Id: I3e6de6da27183b2a0a73a390e394f95a945856d9
Signed-off-by: Colin Cross <ccross@android.com>

Conflicts:
	include/linux/nmi.h
	kernel/watchdog.c
	lib/Kconfig.debug
cpufreq: interactive: add timer slack to limit idle at speed > min

Always use deferrable timer for load sampling.

Set a non-deferrable timer to an additional slack time to allow prior to
waking up from idle to drop speed when not at minimum speed.  Slack value
-1 avoids wakeups to drop speed.  Default is 80ms.

Remove the governidle module param and its timer management in idle.  For
platforms on which holding speed above mimum in idle costs power, use the
new timer slack to select how long to wait before waking up to drop speed.

Change-Id: I270b3980667e2c70a68e5bff534124b4411dbad5
Signed-off-by: Todd Poynor <toddpoynor@google.com>

Conflicts:
	drivers/cpufreq/cpufreq_interactive.c
tuna_ak_defconfig: Enable NMI_WATCHDOG + HARDLOCKUP_DETECTOR
tuna_ak_defconfig: Enable HARDLOCKUP_DETECTOR_OTHER_CPU
omap_wdt.c: Cleaning from touch_watchdog_notifier_head
cpufreq: interactive: fix boosting logic

35a84de cpufreq: interactive: apply above_hispeed_delay to each step above hispeed

caused the speed choice logic to osciallate between boosting and not boosting.
Add back code to ensure speed does not drop below boost frequency while
boosting.

Change-Id: Id420068480fcc7f5c4989ff523e2a8d22e2f4db2
Signed-off-by: Todd Poynor <toddpoynor@google.com>
cpufreq: interactive: fix racy timer stopping

When stopping the governor, del_timer_sync() can race against an
invocation of the idle notifier callback, which has the potential
to reactivate the timer.

To fix this issue, a read-write semaphore is used. Multiple readers are
allowed as long as pcpu->governor_enabled is true.  However it can be
moved to false only after taking a write semaphore which would wait for
any on-going asynchronous activities to complete and prevent any more of
those activities to be initiated.

[toddpoynor@google.com: cosmetic and commit text changes]
Change-Id: Ib51165a735d73dcf964a06754c48bdc1913e13d0
Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
net: wireless: bcmdhd: Postpone taking wd_wake lock

Change-Id: I3926d7a1a357d173144f408996f35f0929db711e
Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>
Kernel Version: ak.471.42.berserk
mm/proc-v7.S: Add .arch_extension sec By Linaro
Makefile: Add Graphite optimizations
arm/Makefile + Makefile: Add -pipe
cpufreq: interactive: fix race on timer restart on governor start

Starting the governor, or restarting on a hotplugged-in CPU, can race
with the timer start in idle, triggering a BUG on timer already pending.
Start the timer before setting the enable flag, and use enable_sem to
protect the sequence (and ensure correct order of the update to the
enable flag).  Delete any existing timer for safety.

Change-Id: Ife77cf9fe099e8fd8543224cbf148c6722c2ffb0
Reported-by: Francisco Franco <francisco.franco@cloudcar.com>
Signed-off-by: Todd Poynor <toddpoynor@google.com>
ak-build.sh: Add new Linaro Toolchain 4.7.3-2012.12-20121218
tuna_ak_defconfig: Enable LOGO and FRAMEBUFFER

Conflicts:
	arch/arm/configs/tuna_ak_defconfig
Add console=tty1 + image.dx = 220

Conflicts:
	arch/arm/configs/tuna_ak_defconfig
Merge tag 'fbdev-fixes-for-3.6-1' of git://github.com/schandinat/linux-2.6

Pull fbdev fixes from Florian Tobias Schandinat:
 - a fix by Paul Cercueil to prevent a possible buffer overflow
 - a fix by Bruno Prémont to prevent a rare sleep in invalid context
 - a fix by Julia Lawall for a double free in auo_k190x
 - a fix by Dan Carpenter to prevent a division by zero in mb862xxfb
 - a regression fix by Tomi Valkeinen for the SDI output in OMAP
 - a fix by Grazvydas Ignotas to fix the console colors in OMAP

* tag 'fbdev-fixes-for-3.6-1' of git://github.com/schandinat/linux-2.6:
  OMAPFB: fix framebuffer console colors
  OMAPDSS: Fix SDI PLL locking
  video: mb862xxfb: prevent divide by zero bug
  drivers/video/auo_k190x.c: drop kfree of devm_kzalloc's data
  fbcon: Fix bit_putcs() call to kmalloc(s, GFP_KERNEL)
  fbcon: prevent possible buffer overflow.

Conflicts:
	drivers/video/auo_k190x.c
logo: Add AK Kernel Logo - logo_linux_clut224.ppm