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Disable ARCH_QCOM, ARCH_ZYNQMP, ARCH_MEDIATEK which enable other options that are only relevant on the respective boards, none of which are supported targets for Flatcar. Since the arm64 kernel does not support compression, these settings have a significant impact on kernel size. The boot partition size is only 128MB and needs to fit 2 kernels, so we have set ourselves a target of 60MB per kernel. This commit brings down the arm64 kernel size by 3MB. At the same time, enable the settings that are actually relevant: ARCH_BCM, because that one is relevant for Raspberry Pi 4 that runs Linux.
The wireguard module has some crypto dependencies, we benefit from making them all modules so that they don't increase the arm64 kernel size.
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Makes sense for now, thanks! In the future it would be nice to support more boards, though - I'm looking forward to Linux 6.1 to enable generic EFI compression. |
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A changelog entry would be good |
dongsupark
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Oct 21, 2022
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If I understand correctly, we need to merge this PR before #2235, not to exceed the 60MB limit of arm64 Kernel, right?
Please add a proper changelog as Kai said, and feel free to merge.
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We're at 59 MB with that PR (and some recent ones) merged, so yeah, it's necessary to merge this one. Added changelog entries and merging. |
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arm64 kernel shrink
Disable some unneeded kconfig options and turn wireguard into a module. This shrinks the arm64 kernel by ~3MB based on my testing.
How to use
Check image changes to see size decrease. Check kola to see that wireguard continues to work without manually loading module.
Testing done
Build tested.
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.