NAME

       depmod - Generate modules.dep and map files.

SYNOPSIS

       depmod [-b basedir] [-o outdir] [-e] [-E Module.symvers] [-F System.map] [-n] [-v] [-A]
              [-P prefix] [-w] [version]

       depmod [-e] [-E Module.symvers] [-F System.map] [-n] [-v] [-P prefix] [-w] [version]
              [filename...]

DESCRIPTION

       Linux kernel modules can provide services (called "symbols") for other modules to use
       (using one of the EXPORT_SYMBOL variants in the code). If a second module uses this
       symbol, that second module clearly depends on the first module. These dependencies can get
       quite complex.

       depmod creates a list of module dependencies by reading each module under
       /lib/modules/version and determining what symbols it exports and what symbols it needs. By
       default, this list is written to modules.dep, and a binary hashed version named
       modules.dep.bin, in the same directory. If filenames are given on the command line, only
       those modules are examined (which is rarely useful unless all modules are listed).  depmod
       also creates a list of symbols provided by modules in the file named modules.symbols and
       its binary hashed version, modules.symbols.bin. Finally, depmod will output a file named
       modules.devname if modules supply special device names (devname) that should be populated
       in /dev on boot (by a utility such as systemd-tmpfiles).

       If a version is provided, then that kernel version's module directory is used rather than
       the current kernel version (as returned by uname -r).

OPTIONS

       -a, --all
           Probe all modules. This option is enabled by default if no file names are given in the
           command-line.

       -A, --quick
           This option scans to see if any modules are newer than the modules.dep file before any
           work is done: if not, it silently exits rather than regenerating the files.

       -b basedir, --basedir basedir
           If your modules are not currently in the (normal) directory /lib/modules/version, but
           in a staging area, you can specify a basedir which is prepended to the directory name.
           This basedir is stripped from the resulting modules.dep file, so it is ready to be
           moved into the normal location. Use this option if you are a distribution vendor who
           needs to pre-generate the meta-data files rather than running depmod again later.

       -o outdir, --outdir outdir
           Set the output directory where depmod will store any generated file.  outdir serves as
           a root to that location, similar to how basedir is used. Also this setting takes
           precedence and if used together with basedir it will result in the input being that
           directory, but the output being the one set by outdir.

       -C, --config file or directory
           This option overrides the default configuration directory at /etc/depmod.d/.

       -e, --errsyms
           When combined with the -F option, this reports any symbols which a module needs which
           are not supplied by other modules or the kernel. Normally, any symbols not provided by
           modules are assumed to be provided by the kernel (which should be true in a perfect
           world), but this assumption can break especially when additionally updated third party
           drivers are not correctly installed or were built incorrectly.

       -E, --symvers
           When combined with the -e option, this reports any symbol versions supplied by modules
           that do not match with the symbol versions provided by the kernel in its
           Module.symvers. This option is mutually incompatible with -F.

       -F, --filesyms System.map
           Supplied with the System.map produced when the kernel was built, this allows the -e
           option to report unresolved symbols. This option is mutually incompatible with -E.

       -h, --help
           Print the help message and exit.

       -n, --show, --dry-run
           This sends the resulting modules.dep and the various map files to standard output
           rather than writing them into the module directory.

       -P
           Some architectures prefix symbols with an extraneous character. This specifies a
           prefix character (for example '_') to ignore.

       -v, --verbose
           In verbose mode, depmod will print (to stdout) all the symbols each module depends on
           and the module's file name which provides that symbol.

       -V, --version
           Show version of program and exit. See below for caveats when run on older kernels.

       -w
           Warn on duplicate dependencies, aliases, symbol versions, etc.

COPYRIGHT

       This manual page originally Copyright 2002, Rusty Russell, IBM Corporation. Portions
       Copyright Jon Masters, and others.

SEE ALSO

       depmod.d(5), modprobe(8), modules.dep(5)

AUTHORS

       Jon Masters <jcm@jonmasters.org>
           Developer

       Robby Workman <rworkman@slackware.com>
           Developer

       Lucas De Marchi <lucas.de.marchi@gmail.com>
           Developer