This is a note to let you know that I've just added the patch titled Revert "s390/smp: enforce lowcore protection on CPU restart" to the 5.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: revert-s390-smp-enforce-lowcore-protection-on-cpu-restart.patch and it can be found in the queue-5.15 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 953503751a426413ea8aee2299ae3ee971b70d9b Mon Sep 17 00:00:00 2001 From: Alexander Gordeev <agordeev@xxxxxxxxxxxxx> Date: Sat, 6 Aug 2022 09:29:46 +0200 Subject: Revert "s390/smp: enforce lowcore protection on CPU restart" From: Alexander Gordeev <agordeev@xxxxxxxxxxxxx> commit 953503751a426413ea8aee2299ae3ee971b70d9b upstream. This reverts commit 6f5c672d17f583b081e283927f5040f726c54598. This breaks normal crash dump when CPU0 is offline. Signed-off-by: Alexander Gordeev <agordeev@xxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- arch/s390/kernel/setup.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/arch/s390/kernel/setup.c +++ b/arch/s390/kernel/setup.c @@ -507,8 +507,8 @@ static void __init setup_lowcore_dat_on( S390_lowcore.svc_new_psw.mask |= PSW_MASK_DAT; S390_lowcore.program_new_psw.mask |= PSW_MASK_DAT; S390_lowcore.io_new_psw.mask |= PSW_MASK_DAT; - __ctl_set_bit(0, 28); __ctl_store(S390_lowcore.cregs_save_area, 0, 15); + __ctl_set_bit(0, 28); put_abs_lowcore(restart_flags, RESTART_FLAG_CTLREGS); put_abs_lowcore(program_new_psw, lc->program_new_psw); for (cr = 0; cr < ARRAY_SIZE(lc->cregs_save_area); cr++) Patches currently in stable-queue which might be from agordeev@xxxxxxxxxxxxx are queue-5.15/s390-crash-fix-incorrect-number-of-bytes-to-copy-to-.patch queue-5.15/s390-dump-fix-old-lowcore-virtual-vs-physical-addres.patch queue-5.15/s390-smp-cleanup-control-register-update-routines.patch queue-5.15/s390-smp-cleanup-target-cpu-callback-starting.patch queue-5.15/s390-maccess-fix-semantics-of-memcpy_real-and-its-ca.patch queue-5.15/revert-s390-smp-enforce-lowcore-protection-on-cpu-restart.patch queue-5.15/s390-smp-enforce-lowcore-protection-on-cpu-restart.patch queue-5.15/s390-zcore-fix-race-when-reading-from-hardware-syste.patch queue-5.15/s390-dump-fix-os_info-virtual-vs-physical-address-co.patch queue-5.15/s390-maccess-rework-absolute-lowcore-accessors.patch