[jdk21u-dev] RFR: 8333326: Linux Alpine build fails after 8302744 [v3]

[Jan Kratochvil]

> A patch 2 of 6 for: [[21u] Backport intention of 8322420: [Linux] cgroup v2: Limits in parent nested control groups are not detected](https://mail.openjdk.org/pipermail/jdk-updates-dev/2025-April/043206.html)
> 
> It has a patch dependency on PR 1 of 6: https://github.com/openjdk/jdk21u-dev/pull/1648
> 
> This backport is clean.
> 
> The whole patchset has been tested on CentOS-7.9 (for cgroup v1) and on Fedora 40 (for cgroup v2) for test/hotspot/jtreg/containers.

Jan Kratochvil has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:

 - Merge branch 'devmaster' into devmaster-cgroup2reduced12-conflict
 - 8333326: Linux Alpine build fails after 8302744
   
   Reviewed-by: sgehwolf, clanger, stuefe
 - 8302744: Refactor Hotspot container detection code
   
   Reviewed-by: jsjolen, stuefe

-------------

Changes:
  - all: https://git.openjdk.org/jdk21u-dev/pull/1660/files
  - new: https://git.openjdk.org/jdk21u-dev/pull/1660/files/007b97ef..7b8c981c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1660&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1660&range=01-02

  Stats: 46015 lines in 2296 files changed: 25079 ins; 7291 del; 13645 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1660.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1660/head:pull/1660

PR: https://git.openjdk.org/jdk21u-dev/pull/1660