s390/entry: rely on long-displacement facility

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Since commit 4efd417f29 ("s390: raise minimum supported machine
generation to z10"), the long-displacement facility is assumed and
required for the kernel. Clean up a couple of places in the entry code,
where long-displacement could be used directly instead of using a base
register.

However, there are still a few other places where a base register has
to be used to extend short-displacement for the second lowcore page
access. Notably, boot/head.S still has to be built for z900, and in
mcck_int_handler, spt and lbear, which don't have long-displacements,
but need to access save areas at the second lowcore page.

Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

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This commit is contained in:

Vasily Gorbik 2023-03-28 11:09:09 +02:00

parent f62f8b716d

commit 385bf43c48

1 changed files with 3 additions and 5 deletions

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arch/s390/kernel/entry.S

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