[PATCH 5.4 105/177] cpuidle: teo: Ignore disabled idle states that are too deep

Greg Kroah-Hartman
2019-12-16T18:18:44Z

From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

commit 069ce2ef1a6dd84cbd4d897b333e30f825e021f0 upstream.

Prevent disabled CPU idle state with target residencies beyond the
anticipated idle duration from being taken into account by the TEO
governor.

Fixes: b26bf6ab716f ("cpuidle: New timer events oriented governor for tickless systems")
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: 5.1+ <stable@vger.kernel.org> # 5.1+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/cpuidle/governors/teo.c | 7 +++++++
1 file changed, 7 insertions(+)

--- a/drivers/cpuidle/governors/teo.c
+++ b/drivers/cpuidle/governors/teo.c
@@ -258,6 +258,13 @@ static int teo_select(struct cpuidle_dri

if (s->disabled || su->disable) {
/*
+ * Ignore disabled states with target residencies beyond
+ * the anticipated idle duration.
+ */
+ if (s->target_residency > duration_us)
+ continue;
+
+ /*
* If the "early hits" metric of a disabled state is
* greater than the current maximum, it should be taken
* into account, because it would be a mistake to select