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DEPMOD(8)							     DEPMOD(8)



NAME
       depmod - program to generate modules.dep and map files.

SYNOPSIS
       depmod  [  -a ] [ -b basedir ] [ -e ] [ -F System.map ] [ -n ] [ -v ] [
       version ] [ -A ]


       depmod [ -e ] [ -FSystem.map ] [ -n ] [ -v ] [ version ] [ filename ...
       ]


DESCRIPTION
       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 are listed).

       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").

       depmod  will also generate various map files in this directory, for use
       by the hotplug infrastructure.

OPTIONS
       -a --all
	      Probe all modules. This option is enabled by default if no  file
	      names are given in the command-line.

       -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.

       -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).

       -F --filesyms System.map
	      Supplied with the System.map produced when the kernel was built,
	      this allows the -e option to report unresolved symbols.

       -n --dry-run
	      This sends the  resulting	 modules.dep,  then  the  various  map
	      files,  to  standard  output,  rather than writing them into the
	      module directory.

       -A --quick
	      This option scans to see if  any	modules	 are  newer  the  mod-
	      ules.dep file before any work is done: if not, it silently exits
	      rather than regenerating the files.

BACKWARDS COMPATIBILITY
       This version of depmod is for kernels 2.5.48 and above.	If it  detects
       a  kernel  with support for old-style modules, or the version specified
       is before 2.5.48, it will attempt to run depmod.old in its place, so it
       is completely transparent to the user.

COPYRIGHT
       This manual page Copyright 2002, Rusty Russell, IBM Corporation.

SEE ALSO
       modprobe(8), modules.dep(5), depmod.old(8)



				01 October 2013			     DEPMOD(8)
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