I want to create a proc file under /proc/driver directory. I would like to use a macro like proc_root_driver (or something else provided) rather than use "driver/MODULE_NAME" explicitly. I use create_proc_entry :

...

struct proc_dir_entry *simpleproc_fops_entry;

simpleproc_fops_entry = create_proc_entry(MODULE_NAME, 0400, NULL /* proc_root_dir */);

...

After googling, I found suggestion to use proc_root_driver, but when I use it, error "proc_root_driver undeclared in this function". And also, proc_root_driver is not available in linux/proc_fs.h.

I have tried to declare structure like this:

struct proc_dir_entry proc_root; struct proc_dir_entry *proc_root_driver = &proc_root; Errors gone, but proc file didn't exist under /proc/driver or /proc

Anyone here can help me? Thanks in advances.