tree 0a50758b433101ad3616726c6b9fd29c6943301a
parent 1af447bd8cbfb808a320885d214555fb2d32e6e6
author David Riley <davidriley@chromium.org> 1402955912 -0700
committer John Stultz <john.stultz@linaro.org> 1406135795 -0700

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>