[jdk21u-dev] RFR: 8334890: Missing unconditional cross modifying fence in nmethod entry barriers

[Severin Gehwolf]

On Thu, 7 Nov 2024 02:18:54 GMT, Boris Ulasevich <bulasevich at openjdk.org> wrote:

> The change adds an unconditional memory barrier to guarantee the instruction fetcher observes the correct updated immediate.
> 
> Merge conflict caused by minor context difference (added comment in a mainline): fixed manually.
> 
> Testing: jtreg tier 1-3 on arm64 and x64.

It's not clear this change introduces a regression: https://bugs.openjdk.org/browse/JDK-8337778

Please clarify.

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PR Comment: https://git.openjdk.org/jdk21u-dev/pull/1131#issuecomment-2461770526