8291893: riscv: remove fence.i used in user space

[zifeihan]

Please help review this backport to riscv-port-jdk11u.
Backport of JDK-8291893

In addition to the backport 8291947, 8310656 to align and minimize the difference with 17u upstream.

Testing:

• Run tier1-3 tests on SOPHON SG2042 (release)

---

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

Issues

• JDK-8291893: riscv: remove fence.i used in user space (Enhancement - P4)
• JDK-8291947: riscv: fail to build after JDK-8290840 (Bug - P3)
• JDK-8310656: RISC-V: __builtin___clear_cache can fail silently. (Bug - P2)

Reviewers

• Fei Yang (@RealFYang - Reviewer)
• Ludovic Henry (@luhenry - no project role)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/riscv-port-jdk11u.git pull/16/head:pull/16
$ git checkout pull/16

Update a local copy of the PR:
$ git checkout pull/16
$ git pull https://git.openjdk.org/riscv-port-jdk11u.git pull/16/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 16

View PR using the GUI difftool:
$ git pr show -t 16

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/riscv-port-jdk11u/pull/16.diff

Webrev

Link to Webrev Comment

[bridgekeeper]

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

[openjdk]

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

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

8291893: riscv: remove fence.i used in user space
8291947: riscv: fail to build after JDK-8290840
8310656: RISC-V: __builtin___clear_cache can fail silently.

Reviewed-by: fyang, luhenry

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 riscv-port 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.

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➡️ 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).

[openjdk]

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

[luhenry]

Let's make sure we backport openjdk/jdk@faf1b82 as well as it's a fix for the commit you're backporting here.

[mlbridge]

Webrevs

• 02: Full - Incremental (383fd357)
• 01: Full - Incremental (6db0c80f)
• 00: Full (85db9b24)

[openjdk]

@zifeihan Please do not rebase or force-push to an active PR as it invalidates existing review comments. Note for future reference, the bots always squash all changes into a single commit automatically as part of the integration. See OpenJDK Developers’ Guide for more information.

[zifeihan]

/issue add 8291947, 8310656

[openjdk]

@zifeihan
Adding additional issue to issue list: 8291947: riscv: fail to build after JDK-8290840.

Adding additional issue to issue list: 8310656: RISC-V: __builtin___clear_cache can fail silently..

[zifeihan]

Let's make sure we backport openjdk/jdk@faf1b82 as well as it's a fix for the commit you're backporting here.

Hi, Thanks for your review. I've backported 8310656 and added a new commit.

[RealFYang]

Updated change looks good to me. Thanks.

[zifeihan]

@RealFYang @luhenry : Thanks for the review.
/integrate

[openjdk]

@zifeihan
Your change (at version 383fd35) is now ready to be sponsored by a Committer.

[RealFYang]

/sponsor

[openjdk]

Going to push as commit d4b0021.

[openjdk]

@RealFYang @zifeihan Pushed as commit d4b0021.

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