From patchwork Fri Oct 26 09:36:26 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Viresh Kumar X-Patchwork-Id: 1650631 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) by patchwork1.kernel.org (Postfix) with ESMTP id 5B4C53FD4E for ; Fri, 26 Oct 2012 09:38:30 +0000 (UTC) Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1TRgLU-000336-Mp; Fri, 26 Oct 2012 09:36:52 +0000 Received: from casper.infradead.org ([2001:770:15f::2]) by merlin.infradead.org with esmtps (Exim 4.76 #1 (Red Hat Linux)) id 1TRgLR-00032J-Dr for linux-arm-kernel@merlin.infradead.org; Fri, 26 Oct 2012 09:36:49 +0000 Received: from service87.mimecast.com ([91.220.42.44]) by casper.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1TRgLL-0001yp-R2 for linux-arm-kernel@lists.infradead.org; Fri, 26 Oct 2012 09:36:47 +0000 Received: from cam-owa1.Emea.Arm.com (fw-tnat.cambridge.arm.com [217.140.96.21]) by service87.mimecast.com; Fri, 26 Oct 2012 10:36:32 +0100 Received: from localhost ([10.1.255.212]) by cam-owa1.Emea.Arm.com with Microsoft SMTPSVC(6.0.3790.0); Fri, 26 Oct 2012 10:36:30 +0100 From: Viresh Kumar To: rjw@sisk.pl Subject: [PATCH] cpufreq: Avoid calling cpufreq driver's target() routine if target_freq == policy->cur Date: Fri, 26 Oct 2012 15:06:26 +0530 Message-Id: <1d7b6e421a335255da956804b43ce3517538409c.1351244153.git.viresh.kumar@linaro.org> X-Mailer: git-send-email 1.7.12.rc2.18.g61b472e X-OriginalArrivalTime: 26 Oct 2012 09:36:30.0631 (UTC) FILETIME=[611E2B70:01CDB35D] X-MC-Unique: 112102610363201401 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20121026_103644_510660_592E47E4 X-CRM114-Status: UNSURE ( 6.71 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -2.6 (--) X-Spam-Report: SpamAssassin version 3.3.2 on casper.infradead.org summary: Content analysis details: (-2.6 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [91.220.42.44 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] Cc: linaro-dev@lists.linaro.org, patches@linaro.org, Viresh Kumar , linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, cpufreq@vger.kernel.org, pdsw-power-team@arm.com, linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: linux-arm-kernel-bounces@lists.infradead.org Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org Avoid calling cpufreq driver's target() routine if new frequency is same as policies current frequency. Signed-off-by: Viresh Kumar --- drivers/cpufreq/cpufreq.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 261ef65..28dc134 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -1476,6 +1476,10 @@ int __cpufreq_driver_target(struct cpufreq_policy *policy, pr_debug("target for CPU %u: %u kHz, relation %u\n", policy->cpu, target_freq, relation); + + if (target_freq == policy->cur) + return 0; + if (cpu_online(policy->cpu) && cpufreq_driver->target) retval = cpufreq_driver->target(policy, target_freq, relation);