DEPMOD(8)                 (08/17/2021)                  DEPMOD(8)

          depmod - Generate modules.dep and map files.

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

          depmod [-e] [-E Module.symvers] [-F] [-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

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              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
              Supplied with the 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.

              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

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              when run on older kernels.

              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 <>

          Robby Workman <>

          Lucas De Marchi <>

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