diff mbox

[V4,1/7] cpufreq: Merge cpufreq_offline_prepare/finish routines

Message ID e773903ed5010cb3a9e445e2cf3a96db3942ff28.1454988792.git.viresh.kumar@linaro.org
State Accepted
Commit 69cee7147b4a4ea02085d571cd2d9974d4a4d8d5
Headers show

Commit Message

Viresh Kumar Feb. 9, 2016, 3:46 a.m. UTC 
The offline routine was separated into two halves earlier by
'commit 1aee40ac9c86 ("cpufreq: Invoke __cpufreq_remove_dev_finish()
after releasing cpu_hotplug.lock");.

And the reasons cited were, race issues between accessing policy's sysfs
files and policy kobject's cleanup.

That race isn't valid anymore, as we don't remove the policy & its
kobject completely on hotplugs, but do that from ->remove() callback of
subsys framework.

These two routines can be merged back now.

This is a preparatory step for the next patch, that will enforce
policy->rwsem lock around __cpufreq_governor() routines STOP/EXIT
sequence.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

Tested-by: Juri Lelli <juri.lelli@arm.com>

Tested-by: Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com>

---
 drivers/cpufreq/cpufreq.c | 36 ++++++++++--------------------------
 1 file changed, 10 insertions(+), 26 deletions(-)

-- 
2.7.1.370.gb2aa7f8

--
To unsubscribe from this list: send the line "unsubscribe linux-pm" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Comments

Viresh Kumar Feb. 11, 2016, 11:46 a.m. UTC | #1 
On 11-02-16, 02:15, Rafael J. Wysocki wrote:
> And one question tangentially related to this patch: Would it be

> possible to avoid calling __cpufreq_governor(_EXIT) for CPU offline?

> 

> The fact that we still carry out the whole governor teardown at that

> point is slightly disturbing, as in theory it should be possible to

> keep the governor attributes in place across offline/online.


Will think about that after the current code is stable a bit. It should be
possible, but need to see if it is worth it.

-- 
viresh
--
To unsubscribe from this list: send the line "unsubscribe linux-pm" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
diff mbox

Patch

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 9c62bf35b9dc..863ac26c4ecf 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -1361,9 +1361,10 @@  static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif)
 	return ret;
 }
 
-static void cpufreq_offline_prepare(unsigned int cpu)
+static void cpufreq_offline(unsigned int cpu)
 {
 	struct cpufreq_policy *policy;
+	int ret;
 
 	pr_debug("%s: unregistering CPU %u\n", __func__, cpu);
 
@@ -1374,7 +1375,7 @@  static void cpufreq_offline_prepare(unsigned int cpu)
 	}
 
 	if (has_target()) {
-		int ret = __cpufreq_governor(policy, CPUFREQ_GOV_STOP);
+		ret = __cpufreq_governor(policy, CPUFREQ_GOV_STOP);
 		if (ret)
 			pr_err("%s: Failed to stop governor\n", __func__);
 	}
@@ -1397,34 +1398,23 @@  static void cpufreq_offline_prepare(unsigned int cpu)
 	/* Start governor again for active policy */
 	if (!policy_is_inactive(policy)) {
 		if (has_target()) {
-			int ret = __cpufreq_governor(policy, CPUFREQ_GOV_START);
+			ret = __cpufreq_governor(policy, CPUFREQ_GOV_START);
 			if (!ret)
 				ret = __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS);
 
 			if (ret)
 				pr_err("%s: Failed to start governor\n", __func__);
 		}
-	} else if (cpufreq_driver->stop_cpu) {
-		cpufreq_driver->stop_cpu(policy);
-	}
-}
 
-static void cpufreq_offline_finish(unsigned int cpu)
-{
-	struct cpufreq_policy *policy = per_cpu(cpufreq_cpu_data, cpu);
-
-	if (!policy) {
-		pr_debug("%s: No cpu_data found\n", __func__);
 		return;
 	}
 
-	/* Only proceed for inactive policies */
-	if (!policy_is_inactive(policy))
-		return;
+	if (cpufreq_driver->stop_cpu)
+		cpufreq_driver->stop_cpu(policy);
 
 	/* If cpu is last user of policy, free policy */
 	if (has_target()) {
-		int ret = __cpufreq_governor(policy, CPUFREQ_GOV_POLICY_EXIT);
+		ret = __cpufreq_governor(policy, CPUFREQ_GOV_POLICY_EXIT);
 		if (ret)
 			pr_err("%s: Failed to exit governor\n", __func__);
 	}
@@ -1453,10 +1443,8 @@  static void cpufreq_remove_dev(struct device *dev, struct subsys_interface *sif)
 	if (!policy)
 		return;
 
-	if (cpu_online(cpu)) {
-		cpufreq_offline_prepare(cpu);
-		cpufreq_offline_finish(cpu);
-	}
+	if (cpu_online(cpu))
+		cpufreq_offline(cpu);
 
 	cpumask_clear_cpu(cpu, policy->real_cpus);
 	remove_cpu_dev_symlink(policy, cpu);
@@ -2304,11 +2292,7 @@  static int cpufreq_cpu_callback(struct notifier_block *nfb,
 		break;
 
 	case CPU_DOWN_PREPARE:
-		cpufreq_offline_prepare(cpu);
-		break;
-
-	case CPU_POST_DEAD:
-		cpufreq_offline_finish(cpu);
+		cpufreq_offline(cpu);
 		break;
 
 	case CPU_DOWN_FAILED: