DEPMOD(8)							      depmod								 DEPMOD(8)

NAME

       depmod - Generate modules.dep and map files.

SYNOPSIS

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

       depmod [-e] [-E Module.symvers] [-F System.map] [-m] [-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 udev).

       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.

       -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 --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.demarchi@profusion.mobi>
	   Developer

kmod								    06/19/2012								 DEPMOD(8)