1DEPMOD(8)                           depmod                           DEPMOD(8)
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NAME

6       depmod - Generate modules.dep and map files.
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SYNOPSIS

9       depmod [-b basedir] [-e] [-E Module.symvers] [-F System.map] [-n] [-v]
10              [-A] [-P prefix] [-w] [version]
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12       depmod [-e] [-E Module.symvers] [-F System.map] [-n] [-v] [-P prefix]
13              [-w] [version] [filename...]
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DESCRIPTION

16       Linux kernel modules can provide services (called "symbols") for other
17       modules to use (using one of the EXPORT_SYMBOL variants in the code).
18       If a second module uses this symbol, that second module clearly depends
19       on the first module. These dependencies can get quite complex.
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21       depmod creates a list of module dependencies by reading each module
22       under /lib/modules/version and determining what symbols it exports and
23       what symbols it needs. By default, this list is written to modules.dep,
24       and a binary hashed version named modules.dep.bin, in the same
25       directory. If filenames are given on the command line, only those
26       modules are examined (which is rarely useful unless all modules are
27       listed).  depmod also creates a list of symbols provided by modules in
28       the file named modules.symbols and its binary hashed version,
29       modules.symbols.bin. Finally, depmod will output a file named
30       modules.devname if modules supply special device names (devname) that
31       should be populated in /dev on boot (by a utility such as
32       systemd-tmpfiles).
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34       If a version is provided, then that kernel version's module directory
35       is used rather than the current kernel version (as returned by uname
36       -r).
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OPTIONS

39       -a, --all
40           Probe all modules. This option is enabled by default if no file
41           names are given in the command-line.
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43       -A, --quick
44           This option scans to see if any modules are newer than the
45           modules.dep file before any work is done: if not, it silently exits
46           rather than regenerating the files.
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48       -b basedir, --basedir basedir
49           If your modules are not currently in the (normal) directory
50           /lib/modules/version, but in a staging area, you can specify a
51           basedir which is prepended to the directory name. This basedir is
52           stripped from the resulting modules.dep file, so it is ready to be
53           moved into the normal location. Use this option if you are a
54           distribution vendor who needs to pre-generate the meta-data files
55           rather than running depmod again later.
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57       -C, --config file or directory
58           This option overrides the default configuration directory at
59           /etc/depmod.d/.
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61       -e, --errsyms
62           When combined with the -F option, this reports any symbols which a
63           module needs which are not supplied by other modules or the kernel.
64           Normally, any symbols not provided by modules are assumed to be
65           provided by the kernel (which should be true in a perfect world),
66           but this assumption can break especially when additionally updated
67           third party drivers are not correctly installed or were built
68           incorrectly.
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70       -E, --symvers
71           When combined with the -e option, this reports any symbol versions
72           supplied by modules that do not match with the symbol versions
73           provided by the kernel in its Module.symvers. This option is
74           mutually incompatible with -F.
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76       -F, --filesyms System.map
77           Supplied with the System.map produced when the kernel was built,
78           this allows the -e option to report unresolved symbols. This option
79           is mutually incompatible with -E.
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81       -h, --help
82           Print the help message and exit.
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84       -n, --show, --dry-run
85           This sends the resulting modules.dep and the various map files to
86           standard output rather than writing them into the module directory.
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88       -P
89           Some architectures prefix symbols with an extraneous character.
90           This specifies a prefix character (for example '_') to ignore.
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92       -v, --verbose
93           In verbose mode, depmod will print (to stdout) all the symbols each
94           module depends on and the module's file name which provides that
95           symbol.
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97       -V, --version
98           Show version of program and exit. See below for caveats when run on
99           older kernels.
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101       -w
102           Warn on duplicate dependencies, aliases, symbol versions, etc.
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105       This manual page originally Copyright 2002, Rusty Russell, IBM
106       Corporation. Portions Copyright Jon Masters, and others.
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SEE ALSO

109       depmod.d(5), modprobe(8), modules.dep(5)
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AUTHORS

112       Jon Masters <jcm@jonmasters.org>
113           Developer
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115       Robby Workman <rworkman@slackware.com>
116           Developer
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118       Lucas De Marchi <lucas.de.marchi@gmail.com>
119           Developer
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123kmod                              01/29/2021                         DEPMOD(8)
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