threadfn
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This helper function creates and names a kernel thread. The thread will be stopped: use wake_up_process to start it. See also kthread_run.
When woken, the thread will run threadfn() with data as its argument. threadfn() can either call do_exit directly if it is a standalone thread for which noone will call kthread_stop, or return when 'kthread_should_stop' is true (which means kthread_stop has been called). The return value should be zero or a negative error number; it will be passed to kthread_stop.
Returns a task_struct or ERR_PTR(-ENOMEM).