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    Subject[PATCH 5.15 766/779] Revert "s390/smp: enforce lowcore protection on CPU restart"
    Date
    From: Alexander Gordeev <agordeev@linux.ibm.com>

    commit 953503751a426413ea8aee2299ae3ee971b70d9b upstream.

    This reverts commit 6f5c672d17f583b081e283927f5040f726c54598.

    This breaks normal crash dump when CPU0 is offline.

    Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    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++)

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