Passing argument 4 of ‘proc_create’ from incompatible pointer type [closed]

Question

I'm trying to make a simple procfs module, but I get this error:

error: passing argument 4 of ‘proc_create’ from incompatible pointer type [-Werror=incompatible-pointer-types]

I tried many online examples and i got same error message.

Answer 1

You have to use proc_ops in newer kernels instead of file_operations, see https://lore.kernel.org/linux-fsdevel/20191225172228.GA13378@avx2/:

static struct proc_ops my_fops={
    .proc_open = my_proc_open,
    .proc_release = single_release,
    .proc_read = seq_read,
    .proc_lseek = seq_lseek,
    .proc_write = my_proc_write
};