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s390/setup: Recognize sequential instruction fetching facility
authorVasily Gorbik <gor@linux.ibm.com>
Wed, 28 Aug 2024 17:06:49 +0000 (19:06 +0200)
committerVasily Gorbik <gor@linux.ibm.com>
Thu, 29 Aug 2024 20:56:34 +0000 (22:56 +0200)
commitbb91ed0ee3a76406846b99d6aca8121100a14ff5
tree3a7612b2fdc8e6ade1ff8962c82a93fbec252564tree
parentee3daf7c05e70a0b88723ceb18587aed75716729commit | diff
s390/setup: Recognize sequential instruction fetching facility

When sequential instruction fetching facility is present,
certain guarantees are provided for code patching. In particular,
atomic overwrites within 8 aligned bytes is safe from an
instruction-fetching point of view.

Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
arch/s390/include/asm/setup.h diff | blob | history
arch/s390/kernel/early.c diff | blob | history
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