ERROR: modpost: "__module_address" [/home/blackarch/tyton/tyton.ko] undefined!

[net-wayfarer]

Environment:
Distro name and version: Black Arch (rolling release)
Kernel version: 5.10.13-arch1-2
Reproducibility Rate: Always. Even if building the package from AUR it fails.

Steps to reproduce:

1. git clone https://github.com/nbulischeck/tyton.git
2. make
3. Errors on ERROR: modpost: "__module_address" [/home/blackarch/tyton/tyton.ko] undefined!. Please refer to "Actual result" section.

Expected result:
Kernel module should be built.

Actual result:

make -C /lib/modules/5.10.13-arch1-2/build M=/home/blackarch/tyton modules
make[1]: Entering directory '/usr/lib/modules/5.10.13-arch1-2/build'
  CC [M]  /home/blackarch/tyton/src/core.o
  CC [M]  /home/blackarch/tyton/src/util.o
  CC [M]  /home/blackarch/tyton/src/proc.o
  CC [M]  /home/blackarch/tyton/src/module_list.o
  CC [M]  /home/blackarch/tyton/src/syscall_hooks.o
  CC [M]  /home/blackarch/tyton/src/network_hooks.o
  CC [M]  /home/blackarch/tyton/src/netfilter_hooks.o
  CC [M]  /home/blackarch/tyton/src/interrupt_hooks.o
  LD [M]  /home/blackarch/tyton/tyton.o
  MODPOST /home/blackarch/tyton/Module.symvers
ERROR: modpost: "__module_address" [/home/blackarch/tyton/tyton.ko] undefined!
make[2]: *** [scripts/Makefile.modpost:111: /home/blackarch/tyton/Module.symvers] Error 1
make[2]: *** Deleting file '/home/blackarch/tyton/Module.symvers'
make[1]: *** [Makefile:1709: modules] Error 2
make[1]: Leaving directory '/usr/lib/modules/5.10.13-arch1-2/build'
make: *** [Makefile:19: module] Error 2

Severity/Priority
Critical.

Notes
This link from linux-kernel mailing-list might be related.

[nbulischeck]

Thanks for your issue and reference to the mailing list. I'll have to move the module iteration code from https://github.com/nbulischeck/tyton/blob/master/src/module_list.c#L21 to grab module addresses manually now that __module_address is unexported.

[nbulischeck]

For my future reference:

1. __module_address calls mod_find
2. mod_find does a list_for_each_entry_rcu on the module list calling within_module on each one
3. within_module checks the init and core sections to see if the address is within those bounds