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Linux/Documentation/debugging-modules.txt

  1 Debugging Modules after 2.6.3
  2 -----------------------------
  3 
  4 In almost all distributions, the kernel asks for modules which don't
  5 exist, such as "net-pf-10" or whatever.  Changing "modprobe -q" to
  6 "succeed" in this case is hacky and breaks some setups, and also we
  7 want to know if it failed for the fallback code for old aliases in
  8 fs/char_dev.c, for example.
  9 
 10 In the past a debugging message which would fill people's logs was
 11 emitted.  This debugging message has been removed.  The correct way
 12 of debugging module problems is something like this:
 13 
 14 echo '#! /bin/sh' > /tmp/modprobe
 15 echo 'echo "$@" >> /tmp/modprobe.log' >> /tmp/modprobe
 16 echo 'exec /sbin/modprobe "$@"' >> /tmp/modprobe
 17 chmod a+x /tmp/modprobe
 18 echo /tmp/modprobe > /proc/sys/kernel/modprobe
 19 
 20 Note that the above applies only when the *kernel* is requesting
 21 that the module be loaded -- it won't have any effect if that module
 22 is being loaded explicitly using "modprobe" from userspace.

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