8307104: [AIX] VM crashes with UseRTMLocking on Power10

[backwaterred]

Prevent crashes on platforms that don't support transnational memory instructions.

I encountered conflicts with the header file years while making this change. No conflicts with functionality. Essentially a clean backport, but I will wait for a review before proceeding.

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Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• Change must not contain extraneous whitespace
• Commit message must refer to an issue

Issue

• JDK-8307104: [AIX] VM crashes with UseRTMLocking on Power10

Reviewers

• Paul Hohensee (@phohensee - Reviewer)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk20u.git pull/77/head:pull/77
$ git checkout pull/77

Update a local copy of the PR:
$ git checkout pull/77
$ git pull https://git.openjdk.org/jdk20u.git pull/77/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 77

View PR using the GUI difftool:
$ git pr show -t 77

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk20u/pull/77.diff

Webrev

Link to Webrev Comment

[bridgekeeper]

👋 Welcome back tsteele! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[openjdk]

This backport pull request has now been updated with issue from the original commit.

[mlbridge]

Webrevs

• 00: Full (005674f4)

[phohensee]

Copyright dates differences are considered clean. Lgtm.

[openjdk]

@backwaterred This change now passes all automated pre-integration checks.

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

After integration, the commit message for the final commit will be:

8307104: [AIX] VM crashes with UseRTMLocking on Power10

Reviewed-by: phh

You can use pull request commands such as /summary, /contributor and /issue to adjust it as needed.

At the time when this comment was updated there had been 4 new commits pushed to the master branch:

• 2302454: 8307425: Socket input stream read burns CPU cycles with back-to-back poll(0) calls
• 511ba72: 8304350: Font.getStringBounds calculates wrong width for TextAttribute.TRACKING other than 0.0
• 8f816bb: 8307378: Allow collectors to provide specific values for GC notifications' actions
• 47b3b4c: 8307466: java.time.Instant calculation bug in until and between methods

Please see this link for an up-to-date comparison between the source branch of this pull request and the master branch.
As there are no conflicts, your changes will automatically be rebased on top of these commits when integrating. If you prefer to avoid this automatic rebasing, please check the documentation for the /integrate command for further details.

As you do not have Committer status in this project an existing Committer must agree to sponsor your change. Possible candidates are the reviewers of this PR (@phohensee) but any other Committer may sponsor as well.

➡️ To flag this PR as ready for integration with the above commit message, type /integrate in a new comment. (Afterwards, your sponsor types /sponsor in a new comment to perform the integration).

[backwaterred]

The issue has received approval.

/integrate

[openjdk]

@backwaterred
Your change (at version 005674f) is now ready to be sponsored by a Committer.

[phohensee]

/sponsor

[openjdk]

Going to push as commit 68fb0aa.
Since your change was applied there have been 4 commits pushed to the master branch:

• 2302454: 8307425: Socket input stream read burns CPU cycles with back-to-back poll(0) calls
• 511ba72: 8304350: Font.getStringBounds calculates wrong width for TextAttribute.TRACKING other than 0.0
• 8f816bb: 8307378: Allow collectors to provide specific values for GC notifications' actions
• 47b3b4c: 8307466: java.time.Instant calculation bug in until and between methods

Your commit was automatically rebased without conflicts.

[openjdk]

@phohensee @backwaterred Pushed as commit 68fb0aa.

💡 You may see a message that your pull request was closed with unmerged commits. This can be safely ignored.