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Editorial Team
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Asked: 2026-06-06T16:34:12+00:00

I recently created a new header file that I want to include in the

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I recently created a new header file that I want to include in the Linux kernel. I put the .h file in usr/src/linux/include/linux. I put the .c file in usr/src/linux/lib. I updated the Makefile in the lib directory and recompiled the kernel, without error. However, when I tried to use the functions in the header file, I got an error saying that the functions were not defined. I assumed (wrongly) that the kernel would know which c file the header was for. How do I properly set this up?

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1 Answer

  1. Editorial Team

    Where you try to use the functions?

    If tried your function within the kernel (external module). You need to add
    EXPORT_SYMBOL(); to the module where your function is defined.

    Otherwise (from user-space) it is a different (and more complicated).

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