mm/internal.h:518:21: error: use of undeclared identifier 'pfn'
mm/internal.h:519:35: error: use of undeclared identifier 'pfn'
mm/damon/../internal.h:518:21: error: use of undeclared identifier 'pfn'
mm/damon/../internal.h:519:35: error: use of undeclared identifier 'pfn'
kernel/../mm/internal.h:518:21: error: use of undeclared identifier 'pfn'
kernel/../mm/internal.h:519:35: error: use of undeclared identifier 'pfn'
lib/../mm/internal.h:518:21: error: use of undeclared identifier 'pfn'
lib/../mm/internal.h:519:35: error: use of undeclared identifier 'pfn'
fs/../mm/internal.h:518:21: error: use of undeclared identifier 'pfn'
fs/../mm/internal.h:519:35: error: use of undeclared identifier 'pfn'