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On RISC-V, the actual mappable range of physical address space is dependent on the current MMU mode i.e. satp_mode (See Documentation/arch/riscv/vm-layout.rst). Define the DIRECT_MAP_PHYSMEM_END macro based on the existing virtual address space layout macros to expose this information to get_free_mem_region(). Otherwise, it returns a region that couldn't be mapped, which breaks ZONE_DEVICE. Cc: stable@vger.kernel.org # v6.13+ Tested-by: Han Gao <gaohan@iscas.ac.cn> # SG2044 Signed-off-by: Vivian Wang <wangruikang@iscas.ac.cn> Link: https://patch.msgid.link/20260309-riscv-sparsemem-vmemmap-limits-v1-2-f40efe18e3cd@iscas.ac.cn Signed-off-by: Paul Walmsley <pjw@kernel.org>