Linux Kernel module calling a function in another module

Question

Is it possible for a function in a linux kernel module calling a function in another module ?

stackoverflow.com/questions/9820458/kernel-modules-develop/… — Jeyaram
– Jeyaram, Commented Feb 19, 2016 at 12:11
Possible duplicate of How to call exported kernel module functions from another module? — Ciro Santilli OurBigBook.com
– Ciro Santilli OurBigBook.com, Commented May 20, 2017 at 12:29
I wonder why no one else mentioned this. EXPORT_SYMBOL and extern <prototype> is not enough. In the Kbuild file of the module that is importing symbol, add a line KBUILD_EXTRA_SYMBOLS = <path-to-exporting-module>/Module.symvers . This helps the importing module know what symbols will be imported. — Sadman Sakib
– Sadman Sakib, Commented Jun 29, 2023 at 19:51

msc · Accepted Answer · 2016-02-19 07:04:09Z

2

Yes. Of course, the other kernel module must be loaded.

For an example, look at the USB code, which is implemented as a mullti-layer driver, with each layer in its own module.Reference link here.

answered Feb 19, 2016 at 7:04

msc

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avariant · Accepted Answer · 2023-03-02 20:39:27Z

1

It is possible by using EXPORT_SYMBOL in Linux.

If one module has one function called etx_shared_func and one global variable called etx_count. This function and variable can be shared among with all the loadable modules using EXPORT_SYMBOL.

EXPORT_SYMBOL(etx_shared_func);
EXPORT_SYMBOL(etx_count);

edited Mar 2, 2023 at 20:39

avariant

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answered Feb 24, 2023 at 12:15

Anshu Gaur

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