Linux kernel module reference counter is always zero - module

Question

I am implementing a kernel module that exposes some data to userspase using mmap interface.
I create a file in /proc file system passing struct file_operations with pointers to needed functions:
static struct file_operations module_file_ops = {
.owner = THIS_MODULE,
.open = module_open,
.mmap = module_mmap
};
proc_create(THIS_MODULE->name, 0444, NULL, &module_file_ops);
Userspace application is able to open and read from the file (mmap contents) as expected.
When I do lsof I see the file is opened by the userspace app.
However, lsmod always gives zero as usage counter despite I set .owner to THIS_MODULE, so that I can easily remove the module with rmmod and lead the system to crash.
Please advise.
module.c
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/proc_fs.h>
static struct proc_dir_entry *proc_file;
static const struct file_operations test_file_ops = {
.owner = THIS_MODULE
};
static int __init initialize(void) {
int error = 0;
proc_file = proc_create(THIS_MODULE->name, 0444, NULL, &test_file_ops);
if (!proc_file) {
error = -EIO;
}
return error;
}
static void __exit teardown(void) {
proc_remove(proc_file);
}
module_init(initialize);
module_exit(teardown);
Makefile
obj-m += test.o
test-objs := module.o
CC=gcc
KDIR := /lib/modules/$(shell uname -r)/build
PWD := $(shell pwd)
EXTRA_CFLAGS=-I/usr/include -I/usr/include/x86_64-linux-gnu
all:
$(MAKE) -C $(KDIR) SUBDIRS=$(PWD) modules