After the following patches, commitde043da0b9("RISC-V: Fix usage of memblock_enforce_memory_limit") commit1bd14a66ee("RISC-V: Remove any memblock representing unusable memory area") commitb10d6bca87("arch, drivers: replace for_each_membock() with for_each_mem_range()") some logic is useless, kill the mem_start/start/end and unneeded code. Reviewed-by: Atish Patra <atish.patra@wdc.com> Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com> Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>