Linux Power Management development
 help / color / mirror / Atom feed
From: "Rafael J. Wysocki" <rjw@rjwysocki.net>
To: Linux PM <linux-pm@vger.kernel.org>
Cc: LKML <linux-kernel@vger.kernel.org>,
	Viresh Kumar <viresh.kumar@linaro.org>
Subject: [PATCH v1 1/3] cpufreq: Reorganize checks in cpufreq_offline()
Date: Wed, 11 May 2022 17:48:41 +0200	[thread overview]
Message-ID: <4756874.31r3eYUQgx@kreacher> (raw)
In-Reply-To: <5585781.DvuYhMxLoT@kreacher>

From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Notice that cpufreq_offline() only needs to check policy_is_inactive()
once and rearrange the code in there to make that happen.

No expected functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/cpufreq/cpufreq.c |   24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

Index: linux-pm/drivers/cpufreq/cpufreq.c
===================================================================
--- linux-pm.orig/drivers/cpufreq/cpufreq.c
+++ linux-pm/drivers/cpufreq/cpufreq.c
@@ -1590,24 +1590,18 @@ static int cpufreq_offline(unsigned int
 	}
 
 	down_write(&policy->rwsem);
+
 	if (has_target())
 		cpufreq_stop_governor(policy);
 
 	cpumask_clear_cpu(cpu, policy->cpus);
 
-	if (policy_is_inactive(policy)) {
-		if (has_target())
-			strncpy(policy->last_governor, policy->governor->name,
-				CPUFREQ_NAME_LEN);
-		else
-			policy->last_policy = policy->policy;
-	} else if (cpu == policy->cpu) {
-		/* Nominate new CPU */
-		policy->cpu = cpumask_any(policy->cpus);
-	}
-
-	/* Start governor again for active policy */
 	if (!policy_is_inactive(policy)) {
+		/* Nominate a new CPU if necessary. */
+		if (cpu == policy->cpu)
+			policy->cpu = cpumask_any(policy->cpus);
+
+		/* Start the governor again for the active policy. */
 		if (has_target()) {
 			ret = cpufreq_start_governor(policy);
 			if (ret)
@@ -1617,6 +1611,12 @@ static int cpufreq_offline(unsigned int
 		goto unlock;
 	}
 
+	if (has_target())
+		strncpy(policy->last_governor, policy->governor->name,
+			CPUFREQ_NAME_LEN);
+	else
+		policy->last_policy = policy->policy;
+
 	if (cpufreq_thermal_control_enabled(cpufreq_driver)) {
 		cpufreq_cooling_unregister(policy->cdev);
 		policy->cdev = NULL;




  reply	other threads:[~2022-05-11 15:52 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-05-11 15:46 [PATCH v1 0/3] cpufreq: Locking-related changes in cpufreq_offline() and cpufreq_remove_dev() Rafael J. Wysocki
2022-05-11 15:48 ` Rafael J. Wysocki [this message]
2022-05-12  7:05   ` [PATCH v1 1/3] cpufreq: Reorganize checks in cpufreq_offline() Viresh Kumar
2022-05-11 15:50 ` [PATCH v1 2/3] cpufreq: Split cpufreq_offline() Rafael J. Wysocki
2022-05-12  7:28   ` Viresh Kumar
2022-05-11 15:51 ` [PATCH v1 3/3] cpufreq: Rearrange locking in cpufreq_remove_dev() Rafael J. Wysocki
2022-05-12  7:42   ` Viresh Kumar

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=4756874.31r3eYUQgx@kreacher \
    --to=rjw@rjwysocki.net \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-pm@vger.kernel.org \
    --cc=viresh.kumar@linaro.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox