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riscv: use the common sub-word {,f}cmpset implementation
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Authored by kevans on Oct 3 2019, 7:25 PM.
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(For now? I do not know if riscv includes necessary instructions to do sub-word atomics)

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rS FreeBSD src repository - subversion
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Looks good to me. There are no sub-word atomic instructions for RISC-V.

This revision is now accepted and ready to land.Oct 4 2019, 2:35 AM