Messages in this thread Patch in this message | | | From | "Rafael J. Wysocki" <> | Subject | [PATCH v1 09/10] intel_idle: Add module parameter to prevent ACPI _CST from being used | Date | Fri, 13 Dec 2019 10:24:58 +0100 |
| |
From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Add a new module parameter called "no_acpi" to the intel_idle driver to allow the driver to be prevented from using ACPI _CST via kernel command line.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> ---
No changes from the RFC version.
--- drivers/idle/intel_idle.c | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c index a072b84d9595..26fe383bb921 100644 --- a/drivers/idle/intel_idle.c +++ b/drivers/idle/intel_idle.c @@ -1138,6 +1138,10 @@ static bool intel_idle_max_cstate_reached(int cstate) #ifdef CONFIG_ACPI_PROCESSOR_CSTATE #include <acpi/processor.h> +static bool no_acpi __read_mostly; +module_param(no_acpi, bool, 0444); +MODULE_PARM_DESC(no_acpi, "Do not use ACPI _CST for building the idle states list"); + static struct acpi_processor_power acpi_state_table; /** @@ -1167,6 +1171,11 @@ static bool intel_idle_acpi_cst_extract(void) { unsigned int cpu; + if (no_acpi) { + pr_debug("Not allowed to use ACPI _CST\n"); + return false; + } + for_each_possible_cpu(cpu) { struct acpi_processor *pr = per_cpu(processors, cpu); -- 2.16.4
| |