kgsl: do not vmap/memset to zero-out pages

b/18402205 External reports: Video playback failing on Flo after upgrade to
	   Lollipop

Change-Id: I358328ba2bd543d77e4218f32b0695c2f6f6e6c9
Signed-off-by: Iliyan Malchev <malchev@google.com>
msm: kgsl: enable CPU IRQ while suspending context

Make sure that CPU interrupt is enabled before calling adreno
suspend_context when moving from NAP/SLEEP to SLUMBER state.
We send commands to GPU in adreno_drawctxt_switch() which will generate
GPU interrupt. Since CPU interrupt is not enabled, adreno_idle() will
fail because pending interrupt will not be served by CPU this causes
false GPU hang.
msm: kgsl: Restrict GPU memory object alignment to 32MB

The code was being very generous in giving the user the ability to
align GPU objects on 4GB boundaries. Cut the restriction down to
32MB which is still pretty generous but within the realm of
possiblity (especially for a 32 bit GPU).  While we are at it fix
a bug in the page_alloc code that was accidently resetting the
alignment to the alloc page size.  The alignment cannot be _less_
than the max page_alloc size but there certainly isn't any reason
why you couldn't specify a larger alignment if you so wished.
soc: qcom: rq_stats: Pass correct cpu id to update_average_load function

Pass correct cpu number to update_average_load function
from cpufreq_transition_handler function. Also avoid div by zero
condition in update_average_load function.

CRs-Fixed: 708310
Change-Id: I4ec3e54b92c760ac5fa910542524fdfe919f55e9
Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>
hells_defconfig: Disable more debugging and tracing

thx ion-storm
sched: Fix inaccurate accounting for real-time task

It is possible that rq->clock_task was not updated in put_prev_task()
in which case we can potentially overcharge a real-time task for time
it did not run. This is because clock_task could be stale and not
represent the exact time real-time task started running.

Fix this by forcing update of rq->clock_task when real-time task
starts running.

Signed-off-by: Srivatsa Vaddagiri <vatsa@codeaurora.org>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
build: b68-t1-L