DEPMOD - Online Linux Manual PageSection : 8
Updated : 06/30/2022
Source : kmod
Note : depmod

NAMEdepmod − Generate modules​.dep and map files​.

SYNOPSISdepmod [−b basedir] [−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...]

DESCRIPTIONLinux 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)​.

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​. 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 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​.

COPYRIGHTThis manual page originally Copyright 2002, Rusty Russell, IBM Corporation​. Portions Copyright Jon Masters, and others​.

SEE ALSOdepmod.d(5), modprobe(8), modules.dep(5)

AUTHORSJon Masters <​jcm@jonmasters​.org​> Developer Robby Workman <​rworkman@slackware​.com​> Developer Lucas De Marchi <​lucas​.de​.marchi@gmail​.com​> Developer
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