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| /openbmc/linux/arch/s390/include/asm/ |
| H A D | rwonce.h | 434b2660 Fri Feb 24 04:02:36 CST 2023 Heiko Carstens <hca@linux.ibm.com> s390/rwonce: add READ_ONCE_ALIGNED_128() macro
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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