diff mbox

[v4,5/5] cpufreq: Delete dead code related to policy save/restore

Message ID 1406250448-470-6-git-send-email-skannan@codeaurora.org (mailing list archive)
State New, archived
Headers show

Commit Message

Saravana Kannan July 25, 2014, 1:07 a.m. UTC 
Since we no longer destroy/realloc policy during logical hotplug, most of
the policy save/restore code is dead code that doesn't get executed. Remove
those.

Signed-off-by: Saravana Kannan <skannan@codeaurora.org>
---
 drivers/cpufreq/cpufreq.c | 82 +++++++++--------------------------------------
 1 file changed, 15 insertions(+), 67 deletions(-)

Comments

Viresh Kumar Aug. 7, 2014, 11:06 a.m. UTC | #1 
On 25 July 2014 06:37, Saravana Kannan <skannan@codeaurora.org> wrote:
> @@ -1142,31 +1124,11 @@ static int __cpufreq_add_dev(struct device *dev, struct subsys_interface *sif)
>
>         /* If we get this far, this is the first time we are adding the
>          * policy */

We don't need this comment as well..

> -       recover_policy = false;
> -
> -       /*
> -        * Restore the saved policy when doing light-weight init and fall back
> -        * to the full init if that fails.
> -        */
> -       policy = recover_policy ? cpufreq_policy_restore(cpu) : NULL;
> -       if (!policy) {
> -               recover_policy = false;
> -               policy = cpufreq_policy_alloc();
> -               if (!policy)
> -                       goto nomem_out;
> -       }
> -
> -       /*
> -        * In the resume path, since we restore a saved policy, the assignment
> -        * to policy->cpu is like an update of the existing policy, rather than
> -        * the creation of a brand new one. So we need to perform this update
> -        * by invoking update_policy_cpu().
> -        */
> -       if (recover_policy && cpu != policy->cpu)
> -               update_policy_cpu(policy, cpu);

Since we don't do this anymore, what will happen to policy->cpu after
all CPUs of a policy are hotplugged-out and then brought back in?

> -       else
> -               policy->cpu = cpu;
> +       policy = cpufreq_policy_alloc();
> +       if (!policy)
> +               goto nomem_out;
>
> +       policy->cpu = cpu;
>         cpumask_copy(policy->cpus, cpumask_of(cpu));
>
>         init_completion(&policy->kobj_unregister);
> @@ -1190,10 +1152,8 @@ static int __cpufreq_add_dev(struct device *dev, struct subsys_interface *sif)
>          */
>         cpumask_and(policy->cpus, policy->cpus, cpu_online_mask);
>
> -       if (!recover_policy) {
> -               policy->user_policy.min = policy->min;
> -               policy->user_policy.max = policy->max;
> -       }
> +       policy->user_policy.min = policy->min;
> +       policy->user_policy.max = policy->max;
>
>         down_write(&policy->rwsem);
>         write_lock_irqsave(&cpufreq_driver_lock, flags);
> @@ -1252,13 +1212,11 @@ static int __cpufreq_add_dev(struct device *dev, struct subsys_interface *sif)
>         blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
>                                      CPUFREQ_START, policy);
>
> -       if (!recover_policy) {
> -               ret = cpufreq_add_dev_interface(policy, dev);
> -               if (ret)
> -                       goto err_out_unregister;
> -               blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
> -                               CPUFREQ_CREATE_POLICY, policy);
> -       }
> +       ret = cpufreq_add_dev_interface(policy, dev);
> +       if (ret)
> +               goto err_out_unregister;
> +       blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
> +                       CPUFREQ_CREATE_POLICY, policy);
>
>         write_lock_irqsave(&cpufreq_driver_lock, flags);
>         list_add(&policy->policy_list, &cpufreq_policy_list);
> @@ -1266,10 +1224,8 @@ static int __cpufreq_add_dev(struct device *dev, struct subsys_interface *sif)
>
>         cpufreq_init_policy(policy);
>
> -       if (!recover_policy) {
> -               policy->user_policy.policy = policy->policy;
> -               policy->user_policy.governor = policy->governor;
> -       }
> +       policy->user_policy.policy = policy->policy;
> +       policy->user_policy.governor = policy->governor;
>         up_write(&policy->rwsem);
>
>         kobject_uevent(&policy->kobj, KOBJ_ADD);
> @@ -1289,13 +1245,7 @@ err_get_freq:
>         if (cpufreq_driver->exit)
>                 cpufreq_driver->exit(policy);
>  err_set_policy_cpu:
> -       if (recover_policy) {
> -               /* Do not leave stale fallback data behind. */
> -               per_cpu(cpufreq_cpu_data_fallback, cpu) = NULL;
> -               cpufreq_policy_put_kobj(policy);
> -       }
>         cpufreq_policy_free(policy);
> -
>  nomem_out:
>         up_read(&cpufreq_rwsem);
>
> @@ -1442,8 +1392,7 @@ static int __cpufreq_remove_dev_finish(struct device *dev,
>                         }
>                 }
>
> -               if (!cpufreq_suspended)
> -                       cpufreq_policy_put_kobj(policy);
> +               cpufreq_policy_put_kobj(policy);

Sure? This will free kobject.

>                 /*
>                  * Perform the ->exit() even during light-weight tear-down,
> @@ -1458,8 +1407,7 @@ static int __cpufreq_remove_dev_finish(struct device *dev,
>                 list_del(&policy->policy_list);
>                 write_unlock_irqrestore(&cpufreq_driver_lock, flags);
>
> -               if (!cpufreq_suspended)
> -                       cpufreq_policy_free(policy);
> +               cpufreq_policy_free(policy);

Same here.

>         }
>
>         per_cpu(cpufreq_cpu_data, cpu) = NULL;
> --
> 1.8.2.1
>
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> hosted by The Linux Foundation
diff mbox

Patch

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 97edf05..b635e0e 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -37,7 +37,6 @@ 
  */
 static struct cpufreq_driver *cpufreq_driver;
 static DEFINE_PER_CPU(struct cpufreq_policy *, cpufreq_cpu_data);
-static DEFINE_PER_CPU(struct cpufreq_policy *, cpufreq_cpu_data_fallback);
 static DEFINE_RWLOCK(cpufreq_driver_lock);
 DEFINE_MUTEX(cpufreq_governor_lock);
 static LIST_HEAD(cpufreq_policy_list);
@@ -1006,22 +1005,6 @@  static int cpufreq_add_policy_cpu(struct cpufreq_policy *policy,
 }
 #endif
 
-static struct cpufreq_policy *cpufreq_policy_restore(unsigned int cpu)
-{
-	struct cpufreq_policy *policy;
-	unsigned long flags;
-
-	read_lock_irqsave(&cpufreq_driver_lock, flags);
-
-	policy = per_cpu(cpufreq_cpu_data_fallback, cpu);
-
-	read_unlock_irqrestore(&cpufreq_driver_lock, flags);
-
-	policy->governor = NULL;
-
-	return policy;
-}
-
 static struct cpufreq_policy *cpufreq_policy_alloc(void)
 {
 	struct cpufreq_policy *policy;
@@ -1104,7 +1087,6 @@  static int __cpufreq_add_dev(struct device *dev, struct subsys_interface *sif)
 	int ret = -ENOMEM;
 	struct cpufreq_policy *policy;
 	unsigned long flags;
-	bool recover_policy = cpufreq_suspended;
 
 	pr_debug("adding CPU %u\n", cpu);
 
@@ -1142,31 +1124,11 @@  static int __cpufreq_add_dev(struct device *dev, struct subsys_interface *sif)
 
 	/* If we get this far, this is the first time we are adding the
 	 * policy */
-	recover_policy = false;
-
-	/*
-	 * Restore the saved policy when doing light-weight init and fall back
-	 * to the full init if that fails.
-	 */
-	policy = recover_policy ? cpufreq_policy_restore(cpu) : NULL;
-	if (!policy) {
-		recover_policy = false;
-		policy = cpufreq_policy_alloc();
-		if (!policy)
-			goto nomem_out;
-	}
-
-	/*
-	 * In the resume path, since we restore a saved policy, the assignment
-	 * to policy->cpu is like an update of the existing policy, rather than
-	 * the creation of a brand new one. So we need to perform this update
-	 * by invoking update_policy_cpu().
-	 */
-	if (recover_policy && cpu != policy->cpu)
-		update_policy_cpu(policy, cpu);
-	else
-		policy->cpu = cpu;
+	policy = cpufreq_policy_alloc();
+	if (!policy)
+		goto nomem_out;
 
+	policy->cpu = cpu;
 	cpumask_copy(policy->cpus, cpumask_of(cpu));
 
 	init_completion(&policy->kobj_unregister);
@@ -1190,10 +1152,8 @@  static int __cpufreq_add_dev(struct device *dev, struct subsys_interface *sif)
 	 */
 	cpumask_and(policy->cpus, policy->cpus, cpu_online_mask);
 
-	if (!recover_policy) {
-		policy->user_policy.min = policy->min;
-		policy->user_policy.max = policy->max;
-	}
+	policy->user_policy.min = policy->min;
+	policy->user_policy.max = policy->max;
 
 	down_write(&policy->rwsem);
 	write_lock_irqsave(&cpufreq_driver_lock, flags);
@@ -1252,13 +1212,11 @@  static int __cpufreq_add_dev(struct device *dev, struct subsys_interface *sif)
 	blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
 				     CPUFREQ_START, policy);
 
-	if (!recover_policy) {
-		ret = cpufreq_add_dev_interface(policy, dev);
-		if (ret)
-			goto err_out_unregister;
-		blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
-				CPUFREQ_CREATE_POLICY, policy);
-	}
+	ret = cpufreq_add_dev_interface(policy, dev);
+	if (ret)
+		goto err_out_unregister;
+	blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
+			CPUFREQ_CREATE_POLICY, policy);
 
 	write_lock_irqsave(&cpufreq_driver_lock, flags);
 	list_add(&policy->policy_list, &cpufreq_policy_list);
@@ -1266,10 +1224,8 @@  static int __cpufreq_add_dev(struct device *dev, struct subsys_interface *sif)
 
 	cpufreq_init_policy(policy);
 
-	if (!recover_policy) {
-		policy->user_policy.policy = policy->policy;
-		policy->user_policy.governor = policy->governor;
-	}
+	policy->user_policy.policy = policy->policy;
+	policy->user_policy.governor = policy->governor;
 	up_write(&policy->rwsem);
 
 	kobject_uevent(&policy->kobj, KOBJ_ADD);
@@ -1289,13 +1245,7 @@  err_get_freq:
 	if (cpufreq_driver->exit)
 		cpufreq_driver->exit(policy);
 err_set_policy_cpu:
-	if (recover_policy) {
-		/* Do not leave stale fallback data behind. */
-		per_cpu(cpufreq_cpu_data_fallback, cpu) = NULL;
-		cpufreq_policy_put_kobj(policy);
-	}
 	cpufreq_policy_free(policy);
-
 nomem_out:
 	up_read(&cpufreq_rwsem);
 
@@ -1442,8 +1392,7 @@  static int __cpufreq_remove_dev_finish(struct device *dev,
 			}
 		}
 
-		if (!cpufreq_suspended)
-			cpufreq_policy_put_kobj(policy);
+		cpufreq_policy_put_kobj(policy);
 
 		/*
 		 * Perform the ->exit() even during light-weight tear-down,
@@ -1458,8 +1407,7 @@  static int __cpufreq_remove_dev_finish(struct device *dev,
 		list_del(&policy->policy_list);
 		write_unlock_irqrestore(&cpufreq_driver_lock, flags);
 
-		if (!cpufreq_suspended)
-			cpufreq_policy_free(policy);
+		cpufreq_policy_free(policy);
 	}
 
 	per_cpu(cpufreq_cpu_data, cpu) = NULL;