Subject: ACPI: Create proc entry 'power' only C2 or C3 is supported From: Yi Yang <[EMAIL PROTECTED]>
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 <[EMAIL PROTECTED]> --- 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)); - To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html