cpuidle: Fix idle time tracking

Ville reported that on his Core2, which has TSC stop in idle, we would
always report very short idle durations. He tracked this down to
commit:

  e93e59ce5b85 ("cpuidle: Replace ktime_get() with local_clock()")

which replaces ktime_get() with local_clock().

Add a sched_clock_idle_wakeup_event() call, which will re-sync the
clock with ktime_get_ns() when TSC is unstable and no-op otherwise.

Reported-by: Ville Syrjälä <[email protected]>
Tested-by: Ville Syrjälä <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Cc: Daniel Lezcano <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Mike Galbraith <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Rafael J . Wysocki <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Fixes: e93e59ce5b85 ("cpuidle: Replace ktime_get() with local_clock()")
Signed-off-by: Ingo Molnar <[email protected]>

0 files changed, 0 insertions, 0 deletions