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Also will reducing > > MAX_PHYSMEM_BITS below ARM64_PA_BITS have other side effects ? Do > > other platforms have this exact same co-relation between > > MAX_PHYSMEM_BITS and vmemmap range ? > > That's indeed a pretty weird workaround. MAX_PHYSMEM_BITS, as the name > implies, is about the physical bits supported for memory while > VMEMMAP_RANGE tells us the virtual address range. There is a > correlation between them but they are different things conceptually. > > The memory hotplug code uses arch_get_mappable_range(). This should be > called from the amdgpu code rather than changing MAX_PHYSMEM_BITS. OK, thanks I'll pursue that approach.