What is the point of this function?

[Nathan Williams]

On Tue, 2016-06-21 at 00:48 +0200, Andrea Benelli wrote:
> 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). 

Hi Andrea,

That's the case for when CONFIG_SMP isn't defined. What happens when
CONFIG_SMP is defined?

I suggest having a look through the code with a Linux cross reference:

http://lxr.free-electrons.com/ident?v=4.6;i=cpus_share_cache

Regards,
Nathan