This kernel module creates a file /proc/count that contains the number of processes runnning on the system.

To build this kernel module, run make in the root directory (where the Makefile is).

To load the module, run sudo insmod proc_count.ko. This writes to the /proc/count file. To view the count, simply run cat /proc/count.

To remove the kernel module / clean up, run sudo rmmod proc_count.

The kernel release version I tested my module on was 5.14.8-arch1-1. To get this, I ran uname -r.

I ran the provided unit tests, and all 3 of them passed in ~12 seconds.

I also ran a sanity check using modinfo, and the output seemed fine.