Re: What is the point of this function?

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