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depmod [ -b basedir ] [ -e ] [ -F System.map ] [ -n ] [ -v ] [
version ] [ -A ]
depmod [ -e ] [ -FSystem.map ] [ -n ] [ -v ] [ version ] [ file-
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 mod-
ule. 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
in the same directory. If filenames are given on the command line, only
those modules are examined (which is rarely useful unless all modules
If a version is provided, then that kernel version's module directory
is used rather than the current kernel version (as returned by uname
depmod will also generate various map files in this directory for use
by the hotplug infrastructure.
Probe all modules. This option is enabled by default if no file
names are given in the command-line.
This option scans to see if any modules are newer than the mod-
ules.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.
-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
When combined with the -F option, this reports any symbols which
a module needs which are not supplied by other modules or the
In verbose mode, depmod will print (to stdout) all the symbols
each module depends on and the module's file name which provides
Show version of program and exit. See below for caveats when run
on older kernels.
This manual page Copyright 2002, Rusty Russell, IBM Corporation.
depmod.conf(5), modprobe(8), modules.dep(5)