s390/spinlock: add niai spinlock hints

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The z14 machine introduces new mode of the next-instruction-access-intent
NIAI instruction. With NIAI-8 it is possible to pin a cache-line on a
CPU for a small amount of time, NIAI-7 releases the cache-line again.
Finally NIAI-4 can be used to prevent the CPU to speculatively access
memory beyond the compare-and-swap instruction to get the lock.

Use these instruction in the spinlock code.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

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Martin Schwidefsky 2017-04-19 14:54:05 +02:00

parent 8351378f58

commit 7f7e6e28cd

2 changed files with 56 additions and 40 deletions

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9

arch/s390/include/asm/spinlock.h

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87

arch/s390/lib/spinlock.c

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