Trying to include header for vsnprintf throws error in compiling

Question

What is the header file for vsnprintf in the kernel? Can anyone please tell me this, I have kernel 5.14 and I am not sure what headers are default on my system. I have a number of different kernel headers installed, these are:

linux-headers-5.11.0-25
linux-headers-5.11.0-40
linux-headers-5.11.0-25-generic
linux-headers-5.11.0-40-generic
linux-headers-5.11.0-38
linux-headers-5.11.0-38-generic

Which one should be the default? But i like to ask what is the header file for function vsnprintf?

kernel modules need to be compiled with the headers and config file matching the kernel in which they are installed. — stark, Nov 10 '21 at 14:19

score 1 · Accepted Answer · answered Nov 10 '21 at 13:32

Taking a look at the source code for Linux v5.11, the correct header seems to be linux/kernel.h. It's the same file for Linux v5.14.

To check which headers you should use for your currently running kernel use the command uname -r which should tell you the correct version. You can then compile using those and an appropriate Makefile: see the documentation for more info.

Trying to include header for vsnprintf throws error in compiling

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