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60afa553ab
The kdump branch of the diskless kernel command line has a default reservation for ppc64 and x86 only. On any other architecture an image with linuximage.dump set but no linuximage.crashkernelsize got dump= and no crashkernel= at all, so the kernel reserved nothing and kdump could never run. EL has no default reservation for riscv64 either (kdumpctl get-default-crashkernel is empty there), so nothing else fills the gap. Give riscv64 the same treatment as the architectures around it and default to 256M. An explicit crashkernelsize still wins, and images without dump are unchanged.