timekeeping: Fix time moving backwards

Changed the calculation logic that sometimes calculates
the time wrong.

Sometimes there is an overflow when the tv_nsec field in
the timespec structure is being added since it is 32-bit.

To resolve this issue nsec variable is being added first
so that the addition is performed in 64 bit signed format.

Bug 1217429

Change-Id: I9c65da88f02596ba73c47be6342ed909e650db22
Signed-off-by: Ajay Nandakumar <anandakumarm@nvidia.com>
Reviewed-on: http://git-master/r/195092
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Prashant Gaikwad <pgaikwad@nvidia.com>
Reviewed-by: Shridhar Rasal <srasal@nvidia.com>
Reviewed-by: Bo Yan <byan@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com>
Tested-by: Shridhar Rasal <srasal@nvidia.com>

Conflicts:
	kernel/time/timekeeping.c
Cpufreq: create/remove percpu sysfs nodes once

On cpu hotplug on/off, percpu "cpufreq" sysfs node and it's
sub nodes are freshly created and removed. This increases
cpu up/down latency.

Create percpu "cpufreq" sysfs node and it's sub nodes in driver
registration and remove it in unregistration. This decreases
cpu up/down latency significantly.

Change-Id: I5c2b02e74de0ae4fe08dedc959bd7402cd9b7aa5
Signed-off-by: Puneet Saxena <puneets@nvidia.com>
Reviewed-on: http://git-master/r/146812
(cherry picked from commit 298382285677fa791098d117ccc0a0a3d9ab0f9a)
Reviewed-on: http://git-master/r/219379
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Sachin Nikam <snikam@nvidia.com>

modified for use on Mako by faux123

Signed-off-by: Paul Reioux <reioux@gmail.com>