From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753618Ab3CKBeC (ORCPT ); Sun, 10 Mar 2013 21:34:02 -0400 Received: from mga02.intel.com ([134.134.136.20]:30245 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753425Ab3CKBeA (ORCPT ); Sun, 10 Mar 2013 21:34:00 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.84,819,1355126400"; d="scan'208";a="275933461" Subject: [PATCH 2/3 V2] intel_idle: Removing the redundant calculating for dev->state_count From: Chuansheng Liu To: lenb@kernel.org, daniel.lezcano@linaro.org Cc: len.brown@intel.com, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, chuansheng.liu@intel.com In-Reply-To: <1362755074.31506.45.camel@cliu38-desktop-build> References: <1362674529.31506.17.camel@cliu38-desktop-build> <1362754926.31506.42.camel@cliu38-desktop-build> <1362755074.31506.45.camel@cliu38-desktop-build> Content-Type: text/plain; charset="UTF-8" Date: Mon, 11 Mar 2013 18:44:17 +0800 Message-ID: <1362998657.31506.52.camel@cliu38-desktop-build> Mime-Version: 1.0 X-Mailer: Evolution 2.28.3 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org In function intel_idle_cpu_init() and intel_idle_cpuidle_driver_init(), they are having the same for(;;) loop to count the ->state_count. Although intel_idle_cpu_init() can be called at runtime CPU HOTPLUG case, but max_cstate can not be changed at runtime. So the dev->state_count should be == drv->state_count, in the function cpuidle_register_device() has done the initialization. Here we can clean up these pieces of code. Signed-off-by: liu chuansheng --- drivers/idle/intel_idle.c | 29 ----------------------------- 1 files changed, 0 insertions(+), 29 deletions(-) diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c index 17c9cf9..bb0ae0b 100644 --- a/drivers/idle/intel_idle.c +++ b/drivers/idle/intel_idle.c @@ -599,39 +599,10 @@ static int intel_idle_cpuidle_driver_init(void) */ static int intel_idle_cpu_init(int cpu) { - int cstate; struct cpuidle_device *dev; dev = per_cpu_ptr(intel_idle_cpuidle_devices, cpu); - dev->state_count = 1; - - for (cstate = 0; cstate < CPUIDLE_STATE_MAX; ++cstate) { - int num_substates, mwait_hint, mwait_cstate, mwait_substate; - - if (cpuidle_state_table[cstate].enter == NULL) - break; - - if (cstate + 1 > max_cstate) { - printk(PREFIX "max_cstate %d reached\n", max_cstate); - break; - } - - mwait_hint = flg2MWAIT(cpuidle_state_table[cstate].flags); - mwait_cstate = MWAIT_HINT2CSTATE(mwait_hint); - mwait_substate = MWAIT_HINT2SUBSTATE(mwait_hint); - - /* does the state exist in CPUID.MWAIT? */ - num_substates = (mwait_substates >> ((mwait_cstate + 1) * 4)) - & MWAIT_SUBSTATE_MASK; - - /* if sub-state in table is not enumerated by CPUID */ - if ((mwait_substate + 1) > num_substates) - continue; - - dev->state_count += 1; - } - dev->cpu = cpu; if (cpuidle_register_device(dev)) { -- 1.7.0.4