timekeeping: Use proper timekeeper for debug code
authorStafford Horne <shorne@gmail.com>
Wed, 28 Jun 2017 13:21:35 +0000 (22:21 +0900)
committerJohn Stultz <john.stultz@linaro.org>
Thu, 17 Aug 2017 19:15:04 +0000 (12:15 -0700)
commita529bea8fa6b6dded6179c72d3385e0f7d0a4fde
treed0da3ae49a71c1081f5534ac145bd888d63b1c07
parent28be3f8f48cfb3cf024860f042d424cd4824f5f7
timekeeping: Use proper timekeeper for debug code

When CONFIG_DEBUG_TIMEKEEPING is enabled the timekeeping_check_update()
function will update status like last_warning and underflow_seen on the
timekeeper.

If there are issues found this state is used to rate limit the warnings
that get printed.

This rate limiting doesn't really really work if stored in real_tk as
the shadow timekeeper is overwritten onto real_tk at the end of every
update_wall_time() call, resetting last_warning and other statuses.

Fix rate limiting by using the shadow_timekeeper for
timekeeping_check_update().

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Miroslav Lichvar <mlichvar@redhat.com>
Cc: Richard Cochran <richardcochran@gmail.com>
Cc: Prarit Bhargava <prarit@redhat.com>
Cc: Stephen Boyd <stephen.boyd@linaro.org>
Fixes: commit 57d05a93ada7 ("time: Rework debugging variables so they aren't global")
Signed-off-by: Stafford Horne <shorne@gmail.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
kernel/time/timekeeping.c