Support for Oracle Linux UEK (problem and suggested solution/workaround)

[gitcnd]

System information

Type | Version/Name
Oracle Linux Server release 9.1 | Linux localhost 5.15.0-101.103.2.1.el9uek.x86_64 #2 SMP Tue May 2 01:10:45 PDT 2023 x86_64 x86_64 x86_64 GNU/Linux
Distribution Name | Oracle Linux UEK
Distribution Version | 9
Kernel Version | 5.15.0-101.103.2.1.el9uek.x86_64
Architecture | .x86_6
OpenZFS Version | 2.1.11-1.el9 zfs-2.1.11-1 zfs-kmod-2.1.11-1

Describe the problem you're observing

Oracle "Unbreakable Linux" (a copy of RHEL9 with kernel enhancements) cannot run any shipped zfs code

0. none of the zfs modules in "yum" function (incompatible zfs.ko)
1. rpmbuild -ba zfs-kmod.spec Refuses to build citing missing kernel-devel dependency
2. rpmbuild -ba zfs-kmod.spec builds an non-functional incompatible module if kernel-devel is installed
3. The correct dependency on this platform should be kernel-uek-devel which comes from:
   kernel-uek-devel-5.15.0-101.103.2.1.el9uek.x86_64.rpm

Describe how to reproduce the problem

rpmbuild -ba zfs-kmod.spec
(creates non-functional zfs.ko which gets placed on the system in a location that doesn't get used)

Include any warning/errors/backtraces from the system logs

# /sbin/modprobe zfs
modprobe: FATAL: Module zfs not found in directory /lib/modules/5.15.0-101.103.2.1.el9uek.x86_64

#cd /lib/modules/5.15.0-101.103.2.1.el9uek.x86_64
# ln -s /usr/lib/modules/5.14.0-162.23.1.el9_1.x86_64/extra
# depmod -a
# modprobe zfs
modprobe: ERROR: could not insert 'zfs': Exec format error

# modprobe -f zfs
modprobe: ERROR: could not insert 'zfs': Unknown symbol in module, or unknown parameter (see dmesg)

Workaround

rpm -e kernel-devel
rpm -ivh kernel-uek-devel-5.15.0-101.103.2.1.el9uek.x86_64.rpm
comment out this line in the zfs-kmod.spec file:

#BuildRequires:  %kernel_module_package_buildreqs

rpmbuild -ba zfs-kmod.spec

=> creates working module

[gitcnd]

If someone wants to tell me the high-level way to adjust the .spec file for this, I'm happy to make the changes, test it, and submit the solution as a pull request

[gitcnd]

Fix works great - thanks!