From e704f93af5a083c07b8f722672d63a1d908daf55 Mon Sep 17 00:00:00 2001
From: David Riley <davidriley@chromium.org>
Date: Mon, 16 Jun 2014 14:58:32 -0700
Subject: [PATCH] kernel: time: Add udelay_test module to validate udelay

Create a module that allows udelay() to be executed to ensure that
it is delaying at least as long as requested (with a little bit of
error allowed).

There are some configurations which don't have reliably udelay
due to using a loop delay with cpufreq changes which should use
a counter time based delay instead.  This test aims to identify
those configurations where timing is unreliable.

Signed-off-by: David Riley <davidriley@chromium.org>
Signed-off-by: John Stultz <john.stultz@linaro.org>
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