Hello - I have an idea of where to begin: our kernel code compiles and works on Red Hat, CentOS, and Fedora. In Ubuntu 20.04, I have an error. root@form:/home/john/thor-linux/Kernel/ubuntu20.04# make rmmod: ERROR: Module thor is not currently loaded make: [Makefile:7: all] Error 1 (ignored) make[1]: Entering directory '/usr/src/linux-headers-5.4.0-131-generic' CC [M] /home/john/thor-linux/Kernel/ubuntu22.04/thor.o /home/john/thor-linux/Kernel/ubuntu22.04/thor.o: warning: objtool: _Controller_process_response_map()+0x1b3: unreachable instruction Building modules, stage 2. MODPOST 1 modules CC [M] /home/john/thor-linux/Kernel/ubuntu22.04/thor.mod.o LD [M] /home/john/thor-linux/Kernel/ubuntu22.04/thor.ko make[1]: Leaving directory '/usr/src/linux-headers-5.4.0-131-generic' make[1]: Entering directory '/usr/src/linux-headers-5.4.0-131-generic' CLEAN /home/john/thor-linux/Kernel/ubuntu22.04/Module.symvers make[1]: Leaving directory '/usr/src/linux-headers-5.4.0-131-generic' #@sudo dmesg -C #@sudo insmod /usr/local/etc/thor.ko filename: /usr/local/etc/thor.ko version: 0.1 description: THOR KMOD author: Aronetics license: GPL srcversion: BC856FA85DB2FEFD38A1B2A depends: retpoline: Y name: thor vermagic: 5.4.0-131-generic SMP mod_unload modversions #@sudo dmesg root@form:/home/john/thor-linux/Kernel/ubuntu20.04# <mailto:root@form:/home/john/thor-linux/Kernel/ubuntu20.04#> Every 2.0s: tail -n30 /var/lib/dkms/thor/1.0.1/build/make.log DKMS make.log for thor-1.0.1 for kernel 5.4.0-131-generic (x86_64) Thu 24 Nov 2022 01:10:33 PM EST make: Entering directory '/usr/src/linux-headers-5.4.0-131-generic' CC [M] /var/lib/dkms/thor/1.0.1/build/thor.o /var/lib/dkms/thor/1.0.1/build/thor.o: warning: objtool: _Controller_process_response_map()+0x1b3: unreachable instruction Building modules, stage 2. MODPOST 1 modules CC [M] /var/lib/dkms/thor/1.0.1/build/thor.mod.o LD [M] /var/lib/dkms/thor/1.0.1/build/thor.ko make: Leaving directory '/usr/src/linux-headers-5.4.0-131-generic' Is this an error in objtool on Ubuntu within /usr/src/linux-headers-5.4.0-${26-130}/tools/objtool ?
From RHEL 8
[root@profile rhel8]# make make[1]: Entering directory '/usr/src/kernels/4.18.0-372.26.1.el8_6.x86_64' CC [M] /home/john/thor-linux/Kernel/rhel8/thor.o Building modules, stage 2. MODPOST 1 modules CC /home/john/thor-linux/Kernel/rhel8/thor.mod.o LD [M] /home/john/thor-linux/Kernel/rhel8/thor.ko make[1]: Leaving directory '/usr/src/kernels/4.18.0-372.26.1.el8_6.x86_64' make[1]: Entering directory '/usr/src/kernels/4.18.0-372.26.1.el8_6.x86_64' CLEAN /home/john/thor-linux/Kernel/rhel8/.tmp_versions CLEAN /home/john/thor-linux/Kernel/rhel8/Module.symvers make[1]: Leaving directory '/usr/src/kernels/4.18.0-372.26.1.el8_6.x86_64' #@sudo dmesg -C #@sudo insmod /usr/local/etc/thor.ko filename: /usr/local/etc/thor.ko version: 0.1 description: THOR KMOD author: Aronetics license: GPL rhelversion: 8.6 srcversion: FC77130B3C3461BF8DE20B6 depends: name: thor vermagic: 4.18.0-372.26.1.el8_6.x86_64 SMP mod_unload modversions #@sudo dmesg [root@profile rhel8]# John