8360405: [PPC64] some environments don't support mfdscr instruction

[TheRealMDoerr]

Add back has_mfdscr() checks which were recently removed. See #20262 (comment)

---

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-8360405: [PPC64] some environments don't support mfdscr instruction (Bug - P3)

Reviewers

• Hao Sun (@shqking - Committer)
• Richard Reingruber (@reinrich - Reviewer)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk.git pull/25953/head:pull/25953
$ git checkout pull/25953

Update a local copy of the PR:
$ git checkout pull/25953
$ git pull https://git.openjdk.org/jdk.git pull/25953/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 25953

View PR using the GUI difftool:
$ git pr show -t 25953

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk/pull/25953.diff

Using Webrev

Link to Webrev Comment

[bridgekeeper]

👋 Welcome back mdoerr! 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]

@TheRealMDoerr 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:

8360405: [PPC64] some environments don't support mfdscr instruction

Reviewed-by: haosun, rrich

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 13 new commits pushed to the master branch:

• 850bc20: 8356868: Not all cgroup parameters are made available
• 75ce44a: 8355319: Update Manpage for Compact Object Headers (Production)
• 5c4f92b: 8359788: Internal Error: assert(get_instanceKlass()->is_loaded()) failed: must be at least loaded
• ... and 10 more: https://git.openjdk.org/jdk/compare/0514cee6c884b6d31735551b8a3ce7a2be661094...master

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.

➡️ To integrate this PR with the above commit message to the master branch, type /integrate in a new comment.

[openjdk]

@TheRealMDoerr The following label will be automatically applied to this pull request:

• hotspot

When this pull request is ready to be reviewed, an "RFR" email will be sent to the corresponding mailing list. If you would like to change these labels, use the /label pull request command.

[mlbridge]

Webrevs

• 02: Full - Incremental (7394dd28)
• 01: Full - Incremental (d7f1c1d8)
• 00: Full (48d7cc95)

[shqking]

Thanks for your fix. It works in my local test environment(QEMU) now.

[TheRealMDoerr]

Thanks for testing and for the review!

[reinrich]

Lgtm.
Cheers, Richard.

[TheRealMDoerr]

Thanks for the review! GHA and our internal tests have passed. We'll also need a JDK25 backport.
/integrate

[openjdk]

Going to push as commit f71d64f.
Since your change was applied there have been 13 commits pushed to the master branch:

• 850bc20: 8356868: Not all cgroup parameters are made available
• 75ce44a: 8355319: Update Manpage for Compact Object Headers (Production)
• 5c4f92b: 8359788: Internal Error: assert(get_instanceKlass()->is_loaded()) failed: must be at least loaded
• ... and 10 more: https://git.openjdk.org/jdk/compare/0514cee6c884b6d31735551b8a3ce7a2be661094...master

Your commit was automatically rebased without conflicts.

[openjdk]

@TheRealMDoerr Pushed as commit f71d64f.

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