Communication between kernel and kernel module

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Is there any way to call a function defined in a kernel module from within the kernel proper?

Here's what I'm trying to do:

I'm trying to keep track of when and for how long a process is being executed on the processor, i.e. I need to know when context switches occur.

There is a function called context_switch() in linux/kernel/sched/core.c that is called whenever a context switch happens. I would like to call a function in a kernel module I've written from within context_switch() and pass some data to it.

I've seen how to communicate between user space and kernel space, such as using a file in /dev or using system calls, but not how to communicate within the kernel itself.

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