diff --git a/arch/x86/kernel/acpi/cstate.c b/arch/x86/kernel/acpi/cstate.c
index dde437f5d14ff828dccff19275033ff2330acc60..158ad1483c4352b2f93c7cbb931dfdb8dd40c3bf 100644
--- a/arch/x86/kernel/acpi/cstate.c
+++ b/arch/x86/kernel/acpi/cstate.c
@@ -108,7 +108,7 @@ static long acpi_processor_ffh_cstate_probe_cpu(void *_cx)
cx->type);
}
snprintf(cx->desc,
- ACPI_CX_DESC_LEN, "ACPI FFH INTEL MWAIT 0x%x",
+ ACPI_CX_DESC_LEN, "ACPI FFH MWAIT 0x%x",
cx->address);
out:
return retval;
diff --git a/drivers/cpufreq/cpufreq_governor.c b/drivers/cpufreq/cpufreq_governor.c
index 1d50e97d49f192cd8bf1c5eb0ce569e9641cf43e..6d53f7d9fc7a92d415b507f9b8facdb3f4143b17 100644
--- a/drivers/cpufreq/cpufreq_governor.c
+++ b/drivers/cpufreq/cpufreq_governor.c
@@ -555,12 +555,20 @@ EXPORT_SYMBOL_GPL(cpufreq_dbs_governor_stop);
void cpufreq_dbs_governor_limits(struct cpufreq_policy *policy)
{
- struct policy_dbs_info *policy_dbs = policy->governor_data;
+ struct policy_dbs_info *policy_dbs;
+
+ /* Protect gov->gdbs_data against cpufreq_dbs_governor_exit() */
+ mutex_lock(&gov_dbs_data_mutex);
+ policy_dbs = policy->governor_data;
+ if (!policy_dbs)
+ goto out;
mutex_lock(&policy_dbs->update_mutex);
cpufreq_policy_apply_limits(policy);
gov_update_sample_delay(policy_dbs, 0);
-
mutex_unlock(&policy_dbs->update_mutex);
+
+out:
+ mutex_unlock(&gov_dbs_data_mutex);
}
EXPORT_SYMBOL_GPL(cpufreq_dbs_governor_limits);
diff --git a/drivers/cpuidle/governors/menu.c b/drivers/cpuidle/governors/menu.c
index 1aef60d160eb0c6236bee855a9a2cdd244679418..110483f0e3fbad97c1304b633b5d55c940e1fe70 100644
--- a/drivers/cpuidle/governors/menu.c
+++ b/drivers/cpuidle/governors/menu.c
@@ -328,9 +328,8 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev,
unsigned int polling_threshold;
/*
- * We want to default to C1 (hlt), not to busy polling
- * unless the timer is happening really really soon, or
- * C1's exit latency exceeds the user configured limit.
+ * Default to a physical idle state, not to busy polling, unless
+ * a timer is going to trigger really really soon.
*/
polling_threshold = max_t(unsigned int, 20, s->target_residency);
if (data->next_timer_us > polling_threshold &&
@@ -349,14 +348,12 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev,
* If the tick is already stopped, the cost of possible short
* idle duration misprediction is much higher, because the CPU
* may be stuck in a shallow idle state for a long time as a
- * result of it. In that case say we might mispredict and try
- * to force the CPU into a state for which we would have stopped
- * the tick, unless a timer is going to expire really soon
- * anyway.
+ * result of it. In that case say we might mispredict and use
+ * the known time till the closest timer event for the idle
+ * state selection.
*/
if (data->predicted_us < TICK_USEC)
- data->predicted_us = min_t(unsigned int, TICK_USEC,
- ktime_to_us(delta_next));
+ data->predicted_us = ktime_to_us(delta_next);
} else {
/*
* Use the performance multiplier and the user-configurable
@@ -381,8 +378,22 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev,
continue;
if (idx == -1)
idx = i; /* first enabled state */
- if (s->target_residency > data->predicted_us)
- break;
+ if (s->target_residency > data->predicted_us) {
+ if (!tick_nohz_tick_stopped())
+ break;
+
+ /*
+ * If the state selected so far is shallow and this
+ * state's target residency matches the time till the
+ * closest timer event, select this one to avoid getting
+ * stuck in the shallow one for too long.
+ */
+ if (drv->states[idx].target_residency < TICK_USEC &&
+ s->target_residency <= ktime_to_us(delta_next))
+ idx = i;
+
+ goto out;
+ }
if (s->exit_latency > latency_req) {
/*
* If we break out of the loop for latency reasons, use
@@ -403,14 +414,13 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev,
* Don't stop the tick if the selected state is a polling one or if the
* expected idle duration is shorter than the tick period length.
*/
- if ((drv->states[idx].flags & CPUIDLE_FLAG_POLLING) ||
- expected_interval < TICK_USEC) {
+ if (((drv->states[idx].flags & CPUIDLE_FLAG_POLLING) ||
+ expected_interval < TICK_USEC) && !tick_nohz_tick_stopped()) {
unsigned int delta_next_us = ktime_to_us(delta_next);
*stop_tick = false;
- if (!tick_nohz_tick_stopped() && idx > 0 &&
- drv->states[idx].target_residency > delta_next_us) {
+ if (idx > 0 && drv->states[idx].target_residency > delta_next_us) {
/*
* The tick is not going to be stopped and the target
* residency of the state to be returned is not within
@@ -418,8 +428,8 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev,
* tick, so try to correct that.
*/
for (i = idx - 1; i >= 0; i--) {
- if (drv->states[i].disabled ||
- dev->states_usage[i].disable)
+ if (drv->states[i].disabled ||
+ dev->states_usage[i].disable)
continue;
idx = i;
@@ -429,6 +439,7 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev,
}
}
+out:
data->last_state_idx = idx;
return data->last_state_idx;
diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c
index 738e3546abb166914b42c08e1ed57ce4b7c4a0f3..c2ab577050434bb602fd8c4c8252547b90a9ff4f 100644
--- a/drivers/pci/pci-acpi.c
+++ b/drivers/pci/pci-acpi.c
@@ -615,13 +615,11 @@ static bool acpi_pci_need_resume(struct pci_dev *dev)
/*
* In some cases (eg. Samsung 305V4A) leaving a bridge in suspend over
* system-wide suspend/resume confuses the platform firmware, so avoid
- * doing that, unless the bridge has a driver that should take care of
- * the PM handling. According to Section 16.1.6 of ACPI 6.2, endpoint
+ * doing that. According to Section 16.1.6 of ACPI 6.2, endpoint
* devices are expected to be in D3 before invoking the S3 entry path
* from the firmware, so they should not be affected by this issue.
*/
- if (pci_is_bridge(dev) && !dev->driver &&
- acpi_target_system_state() != ACPI_STATE_S0)
+ if (pci_is_bridge(dev) && acpi_target_system_state() != ACPI_STATE_S0)
return true;
if (!adev || !acpi_device_power_manageable(adev))
diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig
index e880ca22c5a589127b5c7f7023434e99e090972b..3a6c2f87699e355e1772aa1320aa556e7201743b 100644
--- a/kernel/power/Kconfig
+++ b/kernel/power/Kconfig
@@ -105,6 +105,7 @@ config PM_SLEEP
def_bool y
depends on SUSPEND || HIBERNATE_CALLBACKS
select PM
+ select SRCU
config PM_SLEEP_SMP
def_bool y
diff --git a/kernel/sched/idle.c b/kernel/sched/idle.c
index 1a3e9bddd17b67955f5f0446310a090872d7eacf..16f84142f2f492633b6068f8f7536cdae40c6e0d 100644
--- a/kernel/sched/idle.c
+++ b/kernel/sched/idle.c
@@ -190,7 +190,7 @@ static void cpuidle_idle_call(void)
*/
next_state = cpuidle_select(drv, dev, &stop_tick);
- if (stop_tick)
+ if (stop_tick || tick_nohz_tick_stopped())
tick_nohz_idle_stop_tick();
else
tick_nohz_idle_retain_tick();