'L' 00-1F linux/loop.h
'L' E0-FF linux/ppdd.h encrypted disk device driver
<http://linux01.gwdg.de/~alatham/ppdd.html>
-'M' all linux/soundcard.h conflict!
-'M' 00-1F linux/isicom.h conflict!
+'M' all linux/soundcard.h
'N' 00-1F drivers/usb/scanner.h
'P' all linux/soundcard.h
'Q' all linux/soundcard.h