lkml.org 
[lkml]   [2014]   [Jul]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v4 5/5] cpufreq: Delete dead code related to policy save/restore
Date
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(-)

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;
--
1.8.2.1
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
hosted by The Linux Foundation


\
 
 \ /
  Last update: 2014-07-25 03:41    [W:0.245 / U:15.416 seconds]
©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site