RFR: 8321282: RISC-V: SpinPause() not implemented [v2]

[Robbin Ehn]

On Tue, 13 Feb 2024 10:51:21 GMT, Fredrik Bredberg <fbredberg at openjdk.org> wrote:

>> Robbin Ehn has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Removed memory clobber
>
> src/hotspot/os_cpu/linux_riscv/os_linux_riscv.cpp line 415:
> 
>> 413:       // To do: __asm__ volatile("pause " : : : );
>> 414:       // We need to compile against march with zihintpause.
>> 415:       // Currently we do not.
> 
> Just a small improvement suggestion:
> 
>       // Since we're currently not passing '-march=..._zihintpause' to the compiler,
>       // it will not recognize the "pause" instruction, hence the hard-coded instruction.

Fixed!

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PR Review Comment: https://git.openjdk.org/jdk/pull/17820#discussion_r1487843659