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Old 10-22-2009, 02:07 AM   #1
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Kernel Modules using one another even though not using any symbols


I am trying to load two modules in the kernel(v 2.6.9).
Module1 and Module2. Both have simple init and exit functions with a simple printk in both the functions.

Say I have inserted Module1 first.

#insmod Module1.ko
#insmod Module2.ko

Even though Module2 does not make a reference to (or call) any symbols in Module1, when I do lsmod it says Module2 using Module1. Also I can't unload Module1 while Module2 still inserted.

i.e. when I do
#rmmod Module1

I get "Module1 is in use by Module2"

Does insmod (or load_module function in kernel/module.c) optimize the text section of the modules? If yes, based on what criteria, kernel does this optimization?

Is there anyway I can avoid this optimization?


kernel, modules

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