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What is module stacking?
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New modules using the symbols exported by old modules.


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Examples of modules stacking in Linux Kernel?
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Msdos filesystem relies on symbols exported by fat module

Parallel port printer driver (lp) relies on symbols exported by generic parallel port driver (parport)

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Example
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1. Write module which exports a function myadd performing addition of two numbers:
2. write another module which uses the exported function