usage: kernel-doc [-h] [-v] [-d] [-M MODULENAME] [-l] [-Wreturn]
                  [-Wshort-desc] [-Wcontents-before-sections] [-Wall]
                  [-Werror] [-export-file EXPORT_FILE] [-m | -r | -N] [-e |
                  -i | -s SYMBOL] [-n NOSYMBOL] [-D]
                  FILE [FILE ...]
kernel-doc: error: the following arguments are required: FILE
usage: kernel-doc [-h] [-v] [-d] [-M MODULENAME] [-l] [-Wreturn]
                  [-Wshort-desc] [-Wcontents-before-sections] [-Wall]
                  [-Werror] [-export-file EXPORT_FILE] [-m | -r | -N] [-e |
                  -i | -s SYMBOL] [-n NOSYMBOL] [-D]
                  FILE [FILE ...]
kernel-doc: error: the following arguments are required: FILE