8364235: Fix for JDK-8361447 breaks the alignment requirements for GuardedMemory

[dholmes-ora]

Hi all,

This pull request contains a backport of commit 078d0d49 from the openjdk/jdk repository.

The commit being backported was authored by David Holmes on 7 Aug 2025 and was reviewed by Daniel D. Daugherty, Johan Sjölen and Axel Boldt-Christmas.

Thanks!

---

Progress

• JDK-8364235 needs maintainer approval
• Change must not contain extraneous whitespace
• Commit message must refer to an issue

Issue

• JDK-8364235: Fix for JDK-8361447 breaks the alignment requirements for GuardedMemory (Bug - P3 - Approved)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk25u.git pull/75/head:pull/75
$ git checkout pull/75

Update a local copy of the PR:
$ git checkout pull/75
$ git pull https://git.openjdk.org/jdk25u.git pull/75/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 75

View PR using the GUI difftool:
$ git pr show -t 75

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk25u/pull/75.diff

Using Webrev

Link to Webrev Comment

[bridgekeeper]

👋 Welcome back dholmes! 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]

@dholmes-ora 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:

8364235: Fix for JDK-8361447 breaks the alignment requirements for GuardedMemory

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 no new commits pushed to the master branch. If another commit should be pushed before you perform the /integrate command, your PR will be automatically rebased. If you prefer to avoid any potential 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]

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

[openjdk]

⚠️ @dholmes-ora This change is now ready for you to apply for maintainer approval. This can be done directly in each associated issue or by using the /approval command.

[mlbridge]

Webrevs

• 00: Full (6c0d4ebc)

[dholmes-ora]

/integrate

[openjdk]

Going to push as commit a7cdb53.
Since your change was applied there have been 18 commits pushed to the master branch:

• 7392e13: 8365302: RISC-V: compiler/loopopts/superword/TestAlignVector.java fails when vlen=128
• 5cdaaf3: 8361948: Shenandoah: region free capacity unit mismatch
• b20f66f: 8364120: RISC-V: unify the usage of MacroAssembler::instruction_size
• ... and 15 more: https://git.openjdk.org/jdk25u/compare/ece596aa97b25b4d4794621cbd7a96a056d23450...master

Your commit was automatically rebased without conflicts.

[openjdk]

@dholmes-ora Pushed as commit a7cdb53.

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