s390/cpcmd: use register pair instead of register asm

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Remove register asm usage from diag8_noresponse() since it wasn't
needed at all. There is no requirement for even/odd register pairs for
diag 0x8.

For diag_response() use register pairs to fulfill the rx+1 and ry+1
requirements as required if a response buffer is specified. Also
change the inline asm to return the condition code of the diagnose
instruction and do the conditional handling of response length
calculation in C.

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

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Heiko Carstens 2021-06-09 22:59:13 +02:00 • committed by Vasily Gorbik

parent 25130c1a9e

commit 0a9d947fbe

1 changed files with 22 additions and 20 deletions

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arch/s390/kernel/cpcmd.c

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