flatcar-4459: backport "sys-kernel/coreos-modules: Install external mod build files with script"#3838
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tormath1 merged 2 commits intoflatcar-4459from Mar 18, 2026
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The kernel now includes a script for installing the files needed to build out-of-tree modules, rendering our existing code obsolete. The layout is different, but we were following Ubuntu's non-standard layout when there was no need to. Ubuntu's approach is seemingly designed to save space by symlinking common files across different platforms, but Flatcar doesn't need to do this. More importantly, our previous approach relied on a kernel patch we have carried for years that no longer applies from v6.13. The patch cannot simply be reworked as the underlying mechanism has changed. This clears the last major blocker for the arm64 SDK as the previous approach also relied on implicit execution by QEMU. There has been concern that this may break compatibility with some modules, but I have not seen any issues in practise. I have symlinked `source` to `build` even though we don't install the full kernel sources because this is what Fedora does, and it makes the layout resemble Ubuntu a little more. Should any issues arise, I will gladly work with upstreams to resolve them or otherwise make adjustments. Signed-off-by: James Le Cuirot <jlecuirot@microsoft.com> Signed-off-by: Mathieu Tortuyaux <mtortuyaux@microsoft.com>
Signed-off-by: James Le Cuirot <jlecuirot@microsoft.com> Signed-off-by: Mathieu Tortuyaux <mtortuyaux@microsoft.com>
tormath1
moved this to ✅ Testing / in Review
in Flatcar tactical, release planning, and roadmap
sayanchowdhury
approved these changes
Mar 18, 2026
chewi
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Mar 18, 2026
github-project-automation
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moved this from ✅ Testing / in Review
to Implemented
in Flatcar tactical, release planning, and roadmap
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Cherry-picked to:
@sayanchowdhury I would recommend to carefully check the next LTS nightlies to see if something looks weird, the patch was not cherry-picking correctly. |
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In this PR, we backport #3445 to
flatcar-4459(current Stable). This should fix an issue withzfs-kmodcompilation in last Kernel patch releases:changelog/directory (user-facing change, bug fix, security fix, update)/bootand/usrsize, packages, list files for any missing binaries, kernel modules, config files, kernel modules, etc.