Comment 14 for bug 1639924

The minimal patch set for the jammy master-next kernel I've used is:

3d79d0079cae sched: Improve try_invoke_on_locked_down_task()
914f948c313a sched,rcu: Rework try_invoke_on_locked_down_task()
702fa42757b0 sched,livepatch: Use task_call_func()
5516e7085fca sched: Simplify wake_up_*idle*()
86db6bfb3dc8 sched,livepatch: Use wake_up_if_idle()
6fe095210f38 sched: Improve wake_up_all_idle_cpus() take #2
4168d69c57d1 s390/entry: remove unused expoline thunk
a73c3438e6f2 s390: remove unused expoline to BC instructions
1e3807c786b1 s390/nospec: generate single register thunks if possible
[ 0378d08bd3c3 s390/nospec: add an option to use thunk-extern ]
==> 0010-s390-nospec-add-an-option-to-use-thunk-extern.patch
a7f928d3ef3a s390/nospec: align and size extern thunks
298b3cbf7d0e bug: Use normal relative pointers in 'struct bug_entry'
[ 0013 - 816b355fa9ed s390/nospec: build expoline.o for modules_prepare target ]
==> 0013-s390-nospec-build-expoline.o-for-modules_prepare-tar.patch
==> 0014-Set-y-as-default-for-new-CONFIG_EXPOLINE_EXTERN-kern.patch

The two backports and the kernel option patch are attached.