If the following commit is reverted

  commit 30de14b1884ba609fc1acfba5b40309e3a6ccefe
  Author: Sven Schnelle <svens@linux.ibm.com>
  Date:   Fri Apr 8 14:51:26 2022 +0200

      s390: current_stack_pointer shouldn't be a function

qemu can boot a s390 correct. The commit was added in 5.18-rc3. With this
commit reverted qemu-kvm can boot v6.0-rc2 without any problem.

I found this bug while trying to debug a livepatch issue:
https://github.com/SUSE/qa_test_klp/issues/17

I enabled dyndebug while runnig the livepatch testing, but it didn't show
anything useful for the bug:

[  863.108916] livepatch: enabling patch 'klp_tc_10_livepatch'
[  863.112892] livepatch: 'klp_tc_10_livepatch': starting patching transition
[  864.310918] livepatch: 'klp_tc_10_livepatch': patching complete
[  864.972595] livepatch: 'klp_tc_10_livepatch': starting unpatching transition
[  866.395047] livepatch: 'klp_tc_10_livepatch': unpatching complete
[ 1003.993309] livepatch: enabling patch 'klp_tc_10_livepatch'
[ 1003.993320] livepatch: 'klp_tc_10_livepatch': initializing patching
transition
[ 1003.997171] livepatch: 'klp_tc_10_livepatch': starting patching transition
[ 1003.997396] livepatch: klp_try_switch_task: swapper/1:0 is running
[ 1003.997435] livepatch: klp_try_switch_task: swapper/2:0 is running
[ 1003.997467] livepatch: klp_try_switch_task: swapper/3:0 is running
[ 1003.997485] livepatch: klp_try_switch_task: swapper/4:0 is running
[ 1003.997504] livepatch: klp_try_switch_task: swapper/5:0 is running
[ 1003.997509] livepatch: klp_try_switch_task: swapper/6:0 is running
[ 1003.997542] livepatch: klp_try_switch_task: swapper/7:0 is running
[ 1003.997575] livepatch: klp_try_switch_task: swapper/8:0 is running
[ 1003.997610] livepatch: klp_try_switch_task: swapper/9:0 is running
[ 1005.430335] livepatch: 'klp_tc_10_livepatch': completing patching transition
[ 1005.430843] livepatch: 'klp_tc_10_livepatch': patching complete
[ 1006.878375] livepatch: 'klp_tc_10_livepatch': initializing unpatching
transition
[ 1006.878421] livepatch: 'klp_tc_10_livepatch': starting unpatching transition
[ 1006.878644] livepatch: klp_try_switch_task: swapper/1:0 is running
[ 1006.878664] livepatch: klp_try_switch_task: swapper/2:0 is running
[ 1006.878693] livepatch: klp_try_switch_task: swapper/3:0 is running
[ 1006.878722] livepatch: klp_try_switch_task: swapper/4:0 is running
[ 1006.878748] livepatch: klp_try_switch_task: swapper/5:0 is running
[ 1006.878780] livepatch: klp_try_switch_task: swapper/6:0 is running
[ 1006.878811] livepatch: klp_try_switch_task: swapper/7:0 is running
[ 1006.878830] livepatch: klp_try_switch_task: swapper/8:0 is running
[ 1006.878853] livepatch: klp_try_switch_task: swapper/9:0 is running
[ 1008.390362] livepatch: 'klp_tc_10_livepatch': completing unpatching
transition
[ 1008.394954] livepatch: 'klp_tc_10_livepatch': unpatching complete

I believe that maybe the two issues can be linked, due to the nature of the
patch, which can have some impacts on ftrace. Any advice would be welcome.
Thanks!