… > +++ b/include/net/devmem.h > @@ -0,0 +1,115 @@ … > +#ifndef _NET_DEVMEM_H > +#define _NET_DEVMEM_H … I suggest to omit leading underscores from such identifiers. https://wiki.sei.cmu.edu/confluence/display/c/DCL37-C.+Do+not+declare+or+define+a+reserved+identifier Regards, Markus