Merge back earlier cpuidle material for v4.10.

6 files changed, 19 insertions, 10 deletions

diff --git a/drivers/cpuidle/cpuidle-powernv.c b/drivers/cpuidle/cpuidle-powernv.c
index 7fe442ca38f4..0835a37a5f3a 100644
--- a/drivers/cpuidle/cpuidle-powernv.c
+++ b/drivers/cpuidle/cpuidle-powernv.c
@@ -22,7 +22,7 @@
 
 #define POWERNV_THRESHOLD_LATENCY_NS 200000
 
-struct cpuidle_driver powernv_idle_driver = {
+static struct cpuidle_driver powernv_idle_driver = {
         .name             = "powernv_idle",
         .owner            = THIS_MODULE,
 };
diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c
index c73207abb5a4..afc005b917fe 100644
--- a/drivers/cpuidle/cpuidle.c
+++ b/drivers/cpuidle/cpuidle.c
@@ -97,7 +97,17 @@ static int find_deepest_state(struct cpuidle_driver *drv,
         return ret;
 }
 
-#ifdef CONFIG_SUSPEND
+/* Set the current cpu to use the deepest idle state, override governors */
+void cpuidle_use_deepest_state(bool enable)
+{
+        struct cpuidle_device *dev;
+
+        preempt_disable();
+        dev = cpuidle_get_device();
+        dev->use_deepest_state = enable;
+        preempt_enable();
+}
+
 /**
  * cpuidle_find_deepest_state - Find the deepest available idle state.
  * @drv: cpuidle driver for the given CPU.
@@ -109,6 +119,7 @@ int cpuidle_find_deepest_state(struct cpuidle_driver *drv,
         return find_deepest_state(drv, dev, UINT_MAX, 0, false);
 }
 
+#ifdef CONFIG_SUSPEND
 static void enter_freeze_proper(struct cpuidle_driver *drv,
                                 struct cpuidle_device *dev, int index)
 {
diff --git a/drivers/cpuidle/dt_idle_states.c b/drivers/cpuidle/dt_idle_states.c
index a5c111b67f37..ffca4fc0061d 100644
--- a/drivers/cpuidle/dt_idle_states.c
+++ b/drivers/cpuidle/dt_idle_states.c
@@ -38,6 +38,12 @@ static int init_state_node(struct cpuidle_state *idle_state,
          * state enter function.
          */
         idle_state->enter = match_id->data;
+        /*
+         * Since this is not a "coupled" state, it's safe to assume interrupts
+         * won't be enabled when it exits allowing the tick to be frozen
+         * safely. So enter() can be also enter_freeze() callback.
+         */
+        idle_state->enter_freeze = match_id->data;
 
         err = of_property_read_u32(state_node, "wakeup-latency-us",
                                    &idle_state->exit_latency);
diff --git a/drivers/cpuidle/governor.c b/drivers/cpuidle/governor.c
index fb9f511cca23..4e78263e34a4 100644
--- a/drivers/cpuidle/governor.c
+++ b/drivers/cpuidle/governor.c
@@ -9,7 +9,6 @@
  */
 
 #include <linux/mutex.h>
-#include <linux/module.h>
 #include <linux/cpuidle.h>
 
 #include "cpuidle.h"
@@ -53,14 +52,11 @@ int cpuidle_switch_governor(struct cpuidle_governor *gov)
         if (cpuidle_curr_governor) {
                 list_for_each_entry(dev, &cpuidle_detected_devices, device_list)
                         cpuidle_disable_device(dev);
-                module_put(cpuidle_curr_governor->owner);
         }
 
         cpuidle_curr_governor = gov;
 
         if (gov) {
-                if (!try_module_get(cpuidle_curr_governor->owner))
-                        return -EINVAL;
                 list_for_each_entry(dev, &cpuidle_detected_devices, device_list)
                         cpuidle_enable_device(dev);
                 cpuidle_install_idle_handler();
diff --git a/drivers/cpuidle/governors/ladder.c b/drivers/cpuidle/governors/ladder.c
index 63bd5a403e22..fe8f08948fcb 100644
--- a/drivers/cpuidle/governors/ladder.c
+++ b/drivers/cpuidle/governors/ladder.c
@@ -15,7 +15,6 @@
 #include <linux/kernel.h>
 #include <linux/cpuidle.h>
 #include <linux/pm_qos.h>
-#include <linux/module.h>
 #include <linux/jiffies.h>
 #include <linux/tick.h>
 
@@ -177,7 +176,6 @@ static struct cpuidle_governor ladder_governor = {
         .enable =       ladder_enable_device,
         .select =       ladder_select_state,
         .reflect =      ladder_reflect,
-        .owner =        THIS_MODULE,
 };
 
 /**
diff --git a/drivers/cpuidle/governors/menu.c b/drivers/cpuidle/governors/menu.c
index 03d38c291de6..d9b5b9398a0f 100644
--- a/drivers/cpuidle/governors/menu.c
+++ b/drivers/cpuidle/governors/menu.c
@@ -19,7 +19,6 @@
 #include <linux/tick.h>
 #include <linux/sched.h>
 #include <linux/math64.h>
-#include <linux/module.h>
 
 /*
  * Please note when changing the tuning values:
@@ -484,7 +483,6 @@ static struct cpuidle_governor menu_governor = {
         .enable =       menu_enable_device,
         .select =       menu_select,
         .reflect =      menu_reflect,
-        .owner =        THIS_MODULE,
 };
 
 /**