s390/rwonce: add READ_ONCE_ALIGNED_128() macro

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Add an s390 specific READ_ONCE_ALIGNED_128() helper, which can be used for
fast block concurrent (atomic) 128-bit accesses.

The used lpq instruction requires 128-bit alignment. This is also the
reason why the compiler doesn't emit this instruction if __READ_ONCE() is
used for 128-bit accesses.

Link: https://lore.kernel.org/r/20230224100237.3247871-2-hca@linux.ibm.com
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

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Heiko Carstens 2023-02-24 11:02:36 +01:00

parent ebf95e8846

commit 434b26605f

1 changed files with 31 additions and 0 deletions

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arch/s390/include/asm/rwonce.h

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