10/6    lsmod lists the module being used and then has a "used by" column
        where it says how many other mods use it and (usually) what those are.
        Sometime it only says a number (say 1) without any info about what
        that one thing is.  Is there anyway to find out what it is?
        \_ No, there is no mechanism I know of (for 2.2/2.4).  When you
           see the name of the dependent modules, this is based on linking,
           but anything can come in an bump the reference count without
           causing this annotation.  It may also not be a module, but a
           process, for instance a process has a device open on the SCSI card
           to which the driver is attached.