Man page of depmod
Section: Maintenance Commands (8)
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depmod --- program to generate modules.dep and map files.
depmod [-b basedir] [-e] [-F System.map] [-m] [-n] [-v] [version] [-A]
depmod [-e] [-FSystem.map] [-n] [-v] [version] [filename ...]
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
depmod creates a list of module dependencies
by reading each module under
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
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.
- -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)
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/ directory 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
- -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.
- -m --map
Enables generation of the obsolete map files.
- -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.
This manual page Copyright 2002, Rusty Russell, IBM Corporation.
- SEE ALSO
This document was created by
using the manual pages.
Time: 04:17:50 GMT, September 24, 2010