Just ran into a build problem with a custom kernel module I use. On attempting to rebuild the module for kernel 5.14.0-611.13.1.el9_7.x86_64, I got: [dave@burn kernel]$ make clean rm -f mhvtl.ko rm -f *.o rm -f TAGS rm -f config.h [dave@burn kernel]$ make ./config.sh make -C /lib/modules/5.…

I’m failing to see what the problem is in your output. Can you make it more clearer what exactly the problem is? Your first output you seem to suggest the solution to that was to manually install the module, and then you modprobe it and all looks fine. Then you list the systemctl output but I don…

The make is supposed to include performing the install. make detects the warning and bails out. BTF generation is adding some sort of debugging information which could be important to developers. The workaround worked for me but what I could find regarding the issue indicated that that might not …

Hmm, usually when I’ve used make commands, you need to use make install after the make command. Maybe it’s different for kernel modules, I dunno. But yeah you are right to flag it if the BTF message didn’t appear before. Although all it’s doing is skipping that part due to not finding vmlinuz for…

In addition, the ‘make’ command in the original post is being run as standard user, so not sure how it could install a kernel module?

Normally I would do a “sudo make install” as the next step after the make. Previous experience (other projects) has been that this won’t work unless the make completed successfully. That seems not to be the case with this particular problem. I tried doing a sudo make install after this failed mak…

But earlier on, you said [image] DaveAtFraud: The make is supposed to include performing the install. Now you say you have to run ‘make install’ as root, so which is it?

Forgot. Happens when I try to remember infrequently performed tasks. Is thiis punishable by death or just life imprisonment?

Nah, just prob time for a beer and relax :slight_smile:

Nothing wrong with forgetting, it was just hard to make sense of the steps being shown.

[image] gerry666uk: Now you say you have to run ‘make install’ as root, so which is it? Traditionally the ‘install’ rule in makefile copies the “products” of build to somewhere where they are used. For normal applications that somewhere – the “prefix” – tends to be /user/local, so the install…

Build problem with custom kernel module

Rocky Linux Help & Support

gerry666uk December 15, 2025, 10:08pm 7

But earlier on, you said

Now you say you have to run ‘make install’ as root, so which is it?

Topic		Replies	Views
RL 9.3 kernel-devel rpm incomplete? Rocky Linux Help & Support rocky-linux-9	6	1351	November 30, 2023
Kernel questions - finding source, and trouble building Rocky Linux Help & Support	5	1800	June 15, 2023
Kernel make build failed updating to 5.14.0-503: Error! snapapi26/0.8.18 is broken! Missing the source directory or the symbolic link pointing to it Rocky Linux Help & Support	1	184	March 11, 2025
Cannot compile kernel Rocky Linux Help & Support rocky-linux-8	5	1023	January 27, 2024
Kernel Modules (kmod) Rocky Linux Help & Support raspberry-pi , rocky-linux-9	2	1430	August 29, 2023

Build problem with custom kernel module

Related topics