On Fri, Feb 15, 2013 at 12:08 AM, <dirk.brande...@gmail.com> wrote: > From: Dirk Brandewie <dirk.brande...@gmail.com> > > When intel_pstate is configured into the kernel it will become the > perferred scaling driver for processors that is supports. Allow the
s/perferred/preferred s/is/it > user to override this by adding: > intel_pstate=disable > on the kernel command line. > > Signed-off-by: Dirk Brandewie <dirk.j.brande...@intel.com> > --- > Documentation/kernel-parameters.txt | 5 +++++ > drivers/cpufreq/intel_pstate.c | 16 ++++++++++++++++ > 2 files changed, 21 insertions(+), 0 deletions(-) > > diff --git a/Documentation/kernel-parameters.txt > b/Documentation/kernel-parameters.txt > index 6c72381..41c5d9e 100644 > --- a/Documentation/kernel-parameters.txt > +++ b/Documentation/kernel-parameters.txt > @@ -1131,6 +1131,11 @@ bytes respectively. Such letter suffixes can also be > entirely omitted. > 0 disables intel_idle and fall back on > acpi_idle. > 1 to 6 specify maximum depth of C-state. > > + intel_pstate= [X86] > + disable > + Do not enable intel_pstate as the default > + scaling driver for the supported processors > + > intremap= [X86-64, Intel-IOMMU] > on enable Interrupt Remapping (default) > off disable Interrupt Remapping > diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c > index e879963..9cbb733 100644 > --- a/drivers/cpufreq/intel_pstate.c > +++ b/drivers/cpufreq/intel_pstate.c > @@ -773,11 +773,16 @@ static void intel_pstate_exit(void) > } > module_exit(intel_pstate_exit); > > +static int no_load; > + > static int __init intel_pstate_init(void) > { > int rc = 0; > const struct x86_cpu_id *id; > > + if (no_load) > + return -ENODEV; > + > id = x86_match_cpu(intel_pstate_cpu_ids); > if (!id) > return -ENODEV; > @@ -802,6 +807,17 @@ out: > } > device_initcall(intel_pstate_init); > > +static int __init intel_pstate_setup(char *str) Parameter to this is really not required. By default intel_pstate driver is enabled, so just past disable_intel_pstate from command line without any args. > +{ > + if (!str) > + return -EINVAL; > + > + if (!strcmp(str, "disable")) > + no_load = 1; > + return 0; > +} > +early_param("intel_pstate", intel_pstate_setup); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/