About the kernel configuration(CONFIG_CPU_FREQ and CONFIG_CPU_IDLE.)

[孙世龙 sunshilong <sunshilong369@xxxxxxxxx>]

Hi, list
I am using Linux 5.4.78 with PREEMPT_RT patch.
Hardware name: UNO-2372G-J021AE.

It's strange that the frequency of the CPU is not constant(i.e.
not fixed at a specific frequency) if I both disable CONFIG_CPU_FREQ
and CONFIG_CPU_IDLE
whereas
the frequency of the CPU is constant if I only disable CONFIG_CPU_FREQ
(leave CONFIG_CPU_IDLE enabled).

Could somebody please shed some light on this matter? 

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