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From here: http://www.xenomai.org/index.php/FAQs#Which_kernel_settings_should_be_avoided.3F

Which kernel settings should be avoided?
Note that Xenomai will warn you about known invalid combinations during kernel configuration.
- CONFIG_CPU_FREQ
- CONFIG_APM
- CONFIG_ACPI_PROCESSOR

Now, when I look in the .config, I do find these options clearly but I don't know their dependencies.

So, it is wise to simply put a n next to these options in the .config file? Will the make procedure take care of the dependencies?

The make menuconfig window do not present these options explicitly.

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up vote 2 down vote accepted

make menuconfig does present this option. If you are in the menu press / and search for CPU_FREQ. This will show all CONFIG parameters containing CPU_FREQ. It does also show how you can access it through the menu, e.g:

│ Symbol: CPU_FREQ [=y]  
│ Type  : boolean
│ Prompt: CPU Frequency scaling
│   Defined at drivers/cpufreq/Kconfig:3
│   Location:
│     -> Power management and ACPI options
│       -> CPU Frequency scaling

This means you find it under Power managment and ACPI options -> CPU Frequency scaling and the name of the entry is CPU Frequency scaling.

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actually, it was my fault. I was looking for exactly for the term: "CONFIG_CPU_FREQ". I realized later on that it is the "prompt" that we have to look for: "CPU Frequency scaling". –  TheIndependentAquarius Jul 10 '12 at 11:31
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