The primary API for creating kernel threads (that's exposed to us module/driver authors) is kthread_create(); it's a macro that invokes the kthread_create_on_node() API. The fact is, calling kthread_create() alone isn't sufficient to have your kernel thread do anything useful; this is because, while this macro does create the kernel thread, you need to make it a candidate for the scheduler by setting it's stated to running and waking it up. This can be done with the wake_up_process() API (once successful, it's enqueued onto a CPU runqueue, which makes it schedulable so that it runs in the near future). The good news is that the kthread_run() helper macro can be used to invoke both kthread_create() and wake_up_process() in one go. Let's take a look at its implementation in the kernel:
// include/linux/kthread.h
/**
* kthread_run - create and wake a thread.
* @threadfn: the function...
