hrtimer: make select() and poll() use the hrtimer range feature
This patch makes the select() and poll() hrtimers use the new range
feature and settings from the task struct.
In addition, this includes the estimate_accuracy() function that Linus
posted to lkml, but changed entirely based on other peoples lkml feedback.
Signed-off-by: NArjan van de Ven <arjan@linux.intel.com>
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