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Wysocki" , Alexander Gordeev , Anna-Maria Behnsen , Ben Segall , Boqun Feng , Christian Borntraeger , Dietmar Eggemann , Heiko Carstens , Ingo Molnar , Jan Kiszka , Joel Fernandes , Juri Lelli , Kieran Bingham , Madhavan Srinivasan , Mel Gorman , Michael Ellerman , Neeraj Upadhyay , Nicholas Piggin , "Paul E . McKenney" , Peter Zijlstra , Steven Rostedt , Sven Schnelle , Thomas Gleixner , Uladzislau Rezki , Valentin Schneider , Vasily Gorbik , Vincent Guittot , Viresh Kumar , Xin Zhao , linux-pm@vger.kernel.org, linux-s390@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Subject: [PATCH 07/15] cpufreq: ondemand: Simplify idle cputime granularity test Date: Fri, 16 Jan 2026 15:52:00 +0100 Message-ID: <20260116145208.87445-8-frederic@kernel.org> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20260116145208.87445-1-frederic@kernel.org> References: <20260116145208.87445-1-frederic@kernel.org> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit cpufreq calls get_cpu_idle_time_us() just to know if idle cputime accounting has a nanoseconds granularity. Use the appropriate indicator instead to make that deduction. Signed-off-by: Frederic Weisbecker --- drivers/cpufreq/cpufreq_ondemand.c | 7 +------ 1 file changed, 1 insertion(+), 6 deletions(-) diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c index a6ecc203f7b7..2d52ee035702 100644 --- a/drivers/cpufreq/cpufreq_ondemand.c +++ b/drivers/cpufreq/cpufreq_ondemand.c @@ -334,17 +334,12 @@ static void od_free(struct policy_dbs_info *policy_dbs) static int od_init(struct dbs_data *dbs_data) { struct od_dbs_tuners *tuners; - u64 idle_time; - int cpu; tuners = kzalloc(sizeof(*tuners), GFP_KERNEL); if (!tuners) return -ENOMEM; - cpu = get_cpu(); - idle_time = get_cpu_idle_time_us(cpu, NULL); - put_cpu(); - if (idle_time != -1ULL) { + if (tick_nohz_enabled) { /* Idle micro accounting is supported. Use finer thresholds */ dbs_data->up_threshold = MICRO_FREQUENCY_UP_THRESHOLD; } else { -- 2.51.1