depmod


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

       depmod [-e]  [-E Module.symvers]  [-F  System.map]   [-m]   [-n]   [-v]
       [-P prefix]  [-w [       [version]         [filename ...]      ] ]

DESCRIPTION
       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  mod-
       ules.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  mod-
       ules.devname  if  modules  supply  special  device names (devname) that
       should be populated in /dev on boot (by a utility such as udev).


       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 legacy map files in the output direc-
       tory  for  use by the older hotplug infrastructure. These map files are
       largely deprecated.


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

       -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
                 espencially 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 sym-
                 bol 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  sym-
                 bols.  This option is mutually incompatible with -E.


       -h --help Print the help message and exit.


       -m        This  overrides  any  possible  configuration file setting of
                 make_map_files and forces the generation of legacy map files,
                 such as modules.pcimap.


       -n --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 charac-
                 ter.  This specifies a prefix character (for example '_')  to
                 ignore.


       -v --verbose
                 In  verbose  mode, depmod will print (to stdout) all the sym-
                 bols 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,

                                                                     depmod(8)
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