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depmod



SYNOPSIS

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

       depmod [-e]  [-FSystem.map]  [-n]  [-v]  [version]  [file­
       name ...]


DESCRIPTION

       Linux  kernel  modules  can provide services (called "sym­
       bols") for other modules to use  (using  EXPORT_SYMBOL  in
       the code).  If a second module uses this symbol, that sec­
       ond 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  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 mod­
       ule directory is used, rather than the current kernel ver­
       sion (as returned by "uname -r").

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


OPTIONS

       -b basedir --basedir basedir
                 If your modules are not currently in  the  (nor­
                 mal)  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 loca­
                 tion.

       -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.   Nor­
                 mally,  any  symbols not provided by modules are
                 assumed to be  provided  by  the  kernel  (which
                 should be true in a perfect world).

                 This  option  scans  to  see  if any modules are
                 newer the modules.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 trans­
       parent to the user.


COPYRIGHT

       This manual page Copyright 2002, Rusty Russell, IBM Corpo­
       ration.


SEE ALSO

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

                                                        depmod(8)
  
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