s390/spinlock: use cpu alternatives to enable niai instruction

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Enable niai instruction in the spinlock code at run-time for machines
on which facility 49 is available (zEC12 and newer).

Signed-off-by: Vasily Gorbik <gor@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

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Vasily Gorbik 2017-10-12 13:01:47 +02:00 • committed by Martin Schwidefsky

parent 686140a1a9

commit f554be42fd

2 changed files with 5 additions and 9 deletions

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5

arch/s390/include/asm/spinlock.h

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9

arch/s390/lib/spinlock.c

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