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authorLen Brown <len.brown@intel.com>2017-02-28 22:44:16 +0100
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2017-03-06 00:05:31 +0100
commitd82f26925599cae83c38d17d07ae982356e81318 (patch)
tree3ee139fb6287426538053878a874a0231f51821a /drivers/cpufreq
parentcpufreq: intel_pstate: Avoid triggering cpu_frequency tracepoint unnecessarily (diff)
downloadlinux-d82f26925599cae83c38d17d07ae982356e81318.tar.xz
linux-d82f26925599cae83c38d17d07ae982356e81318.zip
cpufreq: Add the "cpufreq.off=1" cmdline option
Add the "cpufreq.off=1" cmdline option. At boot-time, this allows a user to request CONFIG_CPU_FREQ=n behavior from a kernel built with CONFIG_CPU_FREQ=y. This is analogous to the existing "cpuidle.off=1" option and CONFIG_CPU_IDLE=y This capability is valuable when we need to debug end-user issues in the BIOS or in Linux. It is also convenient for enabling comparisons, which may otherwise require a new kernel, or help from BIOS SETUP, which may be buggy or unavailable. Signed-off-by: Len Brown <len.brown@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/cpufreq')
-rw-r--r--drivers/cpufreq/cpufreq.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 80a785ad17e8..7790db2645d7 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -2532,4 +2532,5 @@ static int __init cpufreq_core_init(void)
return 0;
}
+module_param(off, int, 0444);
core_initcall(cpufreq_core_init);