From mboxrd@z Thu Jan 1 00:00:00 1970 From: Yi Yang Subject: [PATCH] ACPI: create proc entry 'power' only if C2 or C3 is supported Date: Thu, 24 Jan 2008 08:45:32 +0800 Message-ID: <1201135532.3969.3.camel@yangyi-dev.bj.intel.com> References: <1198738022.8950.3.camel@yangyi-dev.bj.intel.com> <1198744900.3640.4.camel@yangyi-dev.bj.intel.com> <1198916553.3806.2.camel@yangyi-dev.bj.intel.com> <1199434602.19185.1.camel@yangyi-dev.bj.intel.com> <1199688961.3551.19.camel@yangyi-dev.bj.intel.com> <1199762486.3551.22.camel@yangyi-dev.bj.intel.com> Reply-To: yi.y.yang@intel.com Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Return-path: Received: from mga02.intel.com ([134.134.136.20]:8272 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752439AbYAXJ6t (ORCPT ); Thu, 24 Jan 2008 04:58:49 -0500 In-Reply-To: <1199762486.3551.22.camel@yangyi-dev.bj.intel.com> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: linux-acpi@vger.kernel.org Cc: linux-kernel@vger.kernel.org, lenb@kernel.org, acpi-bugzilla@lists.sourceforge.net Subject: ACPI: Create proc entry 'power' only C2 or C3 is supported From: Yi Yang ACPI processor idle driver makes sense only if the processor supports C2 or C3. For legacy C0 and C1, just the original pm_idle is working , statistics info about promotion, demotion, latency, usage and duration are empty or 0, so these are misleading, users'll think their CPUs support C states (C2 or C3), /proc/acpi/processor/CPU*/power shouldn't exist for this case at all. This patch fixes this issue, it makes ACPI processor idle driver to create proc entry only if the processor supports C2 or C3. Signed-off-by: Yi Yang --- processor_idle.c | 23 ++++++++++++----------- 1 file changed, 12 insertions(+), 11 deletions(-) --- a/drivers/acpi/processor_idle.c 2008-01-24 05:34:29.000000000 +0800 +++ b/drivers/acpi/processor_idle.c 2008-01-24 07:04:59.000000000 +0800 @@ -1738,17 +1738,17 @@ int __cpuinit acpi_processor_power_init( pm_idle = acpi_processor_idle; } #endif - } - /* 'power' [R] */ - entry = create_proc_entry(ACPI_PROCESSOR_FILE_POWER, - S_IRUGO, acpi_device_dir(device)); - if (!entry) - return -EIO; - else { - entry->proc_fops = &acpi_processor_power_fops; - entry->data = acpi_driver_data(device); - entry->owner = THIS_MODULE; + /* 'power' [R] */ + entry = create_proc_entry(ACPI_PROCESSOR_FILE_POWER, + S_IRUGO, acpi_device_dir(device)); + if (!entry) + return -EIO; + else { + entry->proc_fops = &acpi_processor_power_fops; + entry->data = acpi_driver_data(device); + entry->owner = THIS_MODULE; + } } return 0; @@ -1763,7 +1763,8 @@ int acpi_processor_power_exit(struct acp #endif pr->flags.power_setup_done = 0; - if (acpi_device_dir(device)) + if (acpi_device_dir(device) && + ((pr->flags.power) && (!boot_option_idle_override))) remove_proc_entry(ACPI_PROCESSOR_FILE_POWER, acpi_device_dir(device));