depmod(8)                                                            depmod(8)


       depmod — program to generate modules.dep and map files.


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

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


       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

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


       -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
                 Supplied  with  the  produced when the kernel was
                 built, this allows the -e option to  report  unresolved  sym-

       -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.


       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.


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


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


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