Hello, i was looking at the linux/sched.h (kernel version 4.6.2) source code and i found this function at line 1174: 

static inline bool cpus_share_cache(int this_cpu, int that_cpu)
{
        return true;
}

I'm not able to understand the utility of a function that just return a true value. 
i've noticed that there are a lot of functions like this (function that just return a constant). 

so...why? 
thanks.