linux-kernel - [PATCH v2 2/3] cpufreq: schedutil: Refactor sugov_update

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20230509122246.1702397-3-lukasz.luba@arm.com>
Date:   Tue,  9 May 2023 13:22:45 +0100
From:   Lukasz Luba <lukasz.luba@....com>
To:     linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org
Cc:     rostedt@...dmis.org, mhiramat@...nel.org, mingo@...hat.com,
        peterz@...radead.org, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        bsegall@...gle.com, mgorman@...e.de, bristot@...hat.com,
        vschneid@...hat.com, delyank@...com, lukasz.luba@....com,
        qyousef@...gle.com, qyousef@...alina.io
Subject: [PATCH v2 2/3] cpufreq: schedutil: Refactor sugov_update_shared() internals

Remove the if section block. Use the simple check to bail out
and jump to the unlock at the end. That makes the code more readable
and ready for some future tracing.

Signed-off-by: Lukasz Luba <lukasz.luba@....com>
---
 kernel/sched/cpufreq_schedutil.c | 20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/kernel/sched/cpufreq_schedutil.c b/kernel/sched/cpufreq_schedutil.c
index e3211455b203..f462496e5c07 100644
--- a/kernel/sched/cpufreq_schedutil.c
+++ b/kernel/sched/cpufreq_schedutil.c
@@ -446,17 +446,19 @@ sugov_update_shared(struct update_util_data *hook, u64 time, unsigned int flags)
 
 	ignore_dl_rate_limit(sg_cpu);
 
-	if (sugov_should_update_freq(sg_policy, time)) {
-		next_f = sugov_next_freq_shared(sg_cpu, time);
+	if (!sugov_should_update_freq(sg_policy, time))
+		goto unlock;
 
-		if (!sugov_update_next_freq(sg_policy, time, next_f))
-			goto unlock;
+	next_f = sugov_next_freq_shared(sg_cpu, time);
+
+	if (!sugov_update_next_freq(sg_policy, time, next_f))
+		goto unlock;
+
+	if (sg_policy->policy->fast_switch_enabled)
+		cpufreq_driver_fast_switch(sg_policy->policy, next_f);
+	else
+		sugov_deferred_update(sg_policy);
 
-		if (sg_policy->policy->fast_switch_enabled)
-			cpufreq_driver_fast_switch(sg_policy->policy, next_f);
-		else
-			sugov_deferred_update(sg_policy);
-	}
 unlock:
 	raw_spin_unlock(&sg_policy->update_lock);
 }
-- 
2.25.1