s390/entry: use cpu alternative for stck/stckf

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Use a cpu alternative to switch between stck and stckf instead of
making it compile time dependent. This will also make kernels compiled
for old machines, but running on newer machines, use stckf.

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

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Heiko Carstens 2021-02-02 13:46:47 +01:00 • committed by Vasily Gorbik

parent b22446d00a

commit 78f6570946

1 changed files with 3 additions and 5 deletions

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arch/s390/kernel/entry.S

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