Macro define_kcounter 

macro_rules! define_kcounter {
    ($rust_var:ident, $name:expr, $type:ident) => { ... };
}

Macro to safely define a new Counter in Rust that is visible to the kernel.

Example

define_kcounter!(MY_COUNTER, "my.custom.counter", Sum);

fn some_kernel_code() {
    MY_COUNTER.add(1);
}