RFR: 8356556: AArch64: No need for acquire fence in safepoint poll in FFM

[Samuel Chee]

On Tue, 13 May 2025 12:53:56 GMT, Samuel Chee <duke at openjdk.org> wrote:

> Removes the unnecessary acquire to reduce memory ordering requirement since it is not longer needed as threads always disarm their own poll value.

What seems to have happened, is that:

1. I created this GitHub PR and someone else created the corresponding JBS ticket since I don't have the ability to do so.
2. This PR and the JBS ticket didn't automatically link together due to my lack of OCA access.
3. In the time it took for to get my OCA access (1.5 months), someone else saw the unassigned, unresolved JBS ticket, did it themselves and got it upstreamed before I ever got my OCA access.
4. I got my OCA access and realised what just happened.

What should happen now? Should I just close this PR?

And is there something both sides can do to prevent this from happening again? Since its work which has almost identically unnecessarily been done twice.

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PR Comment: https://git.openjdk.org/jdk/pull/25211#issuecomment-3056598584