Hello,

I would like to point out that identifiers like "__INCLUDE_GUARD_DISPLAY_H_" and
"_INCLUDE_GUARD_AHCI_H" do not fit to the expected naming convention of the C++
language standard.
Would you like to adjust your selection for unique names?
https://www.securecoding.cert.org/confluence/display/cplusplus/DCL32-CPP.+Do+not+declare+or+define+a+reserved+identifier#DCL32-CPP.Donotdeclareordefineareservedidentifier-NoncompliantCodeExample%28HeaderGuard%29

https://github.com/fenrus75/powertop/blob/54956f7407c0e369665cd9712a189f601c6ab545/src/display.h#L25
https://github.com/fenrus75/powertop/blob/d7455ba1d0125efed4780a2114ef66165d0cadc1/src/devices/ahci.h#L25

Regards,
Markus