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authorLen Brown <len.brown@intel.com>2017-02-28 16:44:16 -0500
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2017-03-06 00:05:31 +0100
commitd82f26925599cae83c38d17d07ae982356e81318 (patch)
tree3ee139fb6287426538053878a874a0231f51821a /Documentation/admin-guide
parent6407829901f074cf6beef566d6af9a0b0e238f0d (diff)
downloadlinux-d82f26925599cae83c38d17d07ae982356e81318.tar.bz2
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 'Documentation/admin-guide')
-rw-r--r--Documentation/admin-guide/kernel-parameters.txt3
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index be7c0d9506b1..3988d2311f97 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -662,6 +662,9 @@
cpuidle.off=1 [CPU_IDLE]
disable the cpuidle sub-system
+ cpufreq.off=1 [CPU_FREQ]
+ disable the cpufreq sub-system
+
cpu_init_udelay=N
[X86] Delay for N microsec between assert and de-assert
of APIC INIT to start processors. This delay occurs