From: Patrick Pannuto on
Changes from v2:

* Remove usleep API
It seemed the weak consensus that the best way to
force callers to consider the cost / implications
of the underlying hrtimers was to leave only the
range API as an option. Given the dangers of an
implicit slack coupled with the potential
proliferation of interrupts with no slack, forcing
callers to supply a range seems the best choice.

* Documentation updated to reflect changes

* Fix checkpatch warnings to point to the correct file

[PATCH v3 1/4] timer: Added usleep_range timer
[PATCH v3 2/4] Documentation: Add timers/timers-howto.txt
[PATCH v3 3/4] Checkpatch: prefer usleep_range over udelay
[PATCH v3 4/4] Checkpatch: warn about unexpectedly long msleep's
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