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DEPMOD(8)                                                            DEPMOD(8)



NAME
       depmod - program to generate modules.dep and map files.

SYNOPSIS
       depmod [ -b basedir ]  [ -e ]  [ -F System.map ]  [ -n ]  [ -v ]  [ version ]  [ -A ]

       depmod [ -e ]  [ -FSystem.map ]  [ -n ]  [ -v ]  [ version ]  [ filename... ]

DESCRIPTION
       Linux  kernel  modules can provide services (called "symbols") for other modules to use (using EXPORT_SYMBOL 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 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).

       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).

       depmod will also generate various map files in this directory for use by the hotplug infrastructure.

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.

       -C --config file or directory
              This option overrides the default configuration file at /etc/depmod.conf (or the  /etc/depmod.d/  direc-
              tory if that is not found).

       -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).

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

       -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.

       -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.

COPYRIGHT
       This manual page Copyright 2002, Rusty Russell, IBM Corporation.

SEE ALSO
       depmod.conf(5), modprobe(8), modules.dep(5)



                                  2007-03-21                         DEPMOD(8)