armbian-kernel.sh: introduce KERNEL_BTF=no to opt-out of BTF/CO-RE type-info on low-RAM machines
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…type-info on low-RAM machines - turns out `pahole` for `vmlinux` can take multiple gigabytes of RAM to run successfully - I can't simply decide based on available RAM, as that would make .config hashes mismatch - thus, introduce: - default is to enable BTF; if on low-ram host, error out unless KERNEL_BTF=yes is passed - if KERNEL_BTF=no is passed, the BTF debug info is always disabled - if KERNEL_BTF=yes is passed, then a warning is produced, but BTF is still enabled - the magic number "6451 MiB" was determined empirically (and is probably bs)
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armbian-kernel.sh: introduce
KERNEL_BTF=noto opt-out of BTF/CO-RE type-info on low-RAM machinesKERNEL_BTF=noto opt-out of BTF/CO-RE type-info on low-RAM machinespaholeforvmlinuxcan take multiple gigabytes of RAM to run successfully