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cpufreq: Add the "cpufreq.off=1" cmdline option

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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 <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
This commit is contained in:
Len Brown 2017-02-28 16:44:16 -05:00 • committed by Rafael J. Wysocki
commit d82f269255
2 changed files with 4 additions and 0 deletions
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1
drivers/cpufreq/cpufreq.c
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@ -2532,4 +2532,5 @@ static int __init cpufreq_core_init(void)
return 0;
}
module_param(off, int, 0444);
core_initcall(cpufreq_core_init);