s390/nmi: disable interrupts on extended save area update

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Updating of the pointer to machine check extended save area
on the IPL CPU needs the lowcore protection to be disabled.
Disable interrupts while the protection is off to avoid
unnoticed writes to the lowcore.

Suggested-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

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Alexander Gordeev 2021-12-10 16:32:11 +01:00 • committed by Heiko Carstens

parent cff2d3abc8

commit c7ed509b21

4 changed files with 29 additions and 33 deletions

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6

arch/s390/include/asm/nmi.h

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41

arch/s390/kernel/nmi.c

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2

arch/s390/kernel/setup.c

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13

arch/s390/kernel/smp.c

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