s390: fine-tune stack switch helper

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The CALL_ON_STACK helper currently does not work with clang and for
calls without arguments. It does not initialize r2 although the constraint
is "+&d". Rework the CALL_FMT_x and the CALL_ON_STACK macros to work
with clang and produce optimal code in all cases.

Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

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Martin Schwidefsky 2019-04-10 15:48:43 +02:00

parent e24e4712ef

commit 7aa0055e06

1 changed files with 9 additions and 9 deletions

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arch/s390/include/asm/processor.h

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