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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | COPYRIGHT | SEE ALSO | AUTHORS | COLOPHON |
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DEPMOD(8) depmod DEPMOD(8)
depmod - Generate modules.dep and map files.
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...]
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).
-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.
This manual page originally Copyright 2002, Rusty Russell, IBM
Corporation. Portions Copyright Jon Masters, and others.
depmod.d(5), modprobe(8), modules.dep(5)
Jon Masters <jcm@jonmasters.org>
Developer
Robby Workman <rworkman@slackware.com>
Developer
Lucas De Marchi <lucas.de.marchi@gmail.com>
Developer
This page is part of the kmod (userspace tools for managing
kernel modules) project. Information about the project can be
found at [unknown -- if you know, please contact man-
pages@man7.org] If you have a bug report for this manual page,
send it to linux-modules@vger.kernel.org. This page was obtained
from the project's upstream Git repository
⟨git://git.kernel.org/pub/scm/utils/kernel/kmod/kmod.git⟩ on
2024-06-14. (At that time, the date of the most recent commit
that was found in the repository was 2024-06-11.) If you
discover any rendering problems in this HTML version of the page,
or you believe there is a better or more up-to-date source for
the page, or you have corrections or improvements to the
information in this COLOPHON (which is not part of the original
manual page), send a mail to man-pages@man7.org
kmod 06/14/2024 DEPMOD(8)
Pages that refer to this page: depmod.d(5), modules.dep(5), insmod(8), kernel-install(8), kmod(8), lsmod(8), modprobe(8), rmmod(8)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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