But if __is_lm_address() checks against the effective linear range instead
i.e [_PAGE_OFFSET(vabits_actual)..(PAGE_END - 1)], it can be used for hot
plug physical range check there after. Perhaps something like this, though
not tested properly.

diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h
index afa722504bfd..6da046b479d4 100644
--- a/arch/arm64/include/asm/memory.h
+++ b/arch/arm64/include/asm/memory.h

@@ -238,7 +238,10 @@ static inline const void *__tag_set(const void *addr, u8 tag)
  * space. Testing the top bit for the start of the region is a
  * sufficient check and avoids having to worry about the tag.
  */
-#define __is_lm_address(addr)  (!(((u64)addr) & BIT(vabits_actual - 1)))
+static inline bool __is_lm_address(unsigned long addr)
+{
+       return ((addr >= _PAGE_OFFSET(vabits_actual)) && (addr <= (PAGE_END - 1)));
+}
 
 #define __lm_to_phys(addr)     (((addr) + physvirt_offset))
 #define __kimg_to_phys(addr)   ((addr) - kimage_voffset)

diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index d59ffabb9c84..5750370a7e8c 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c

@@ -1451,8 +1451,7 @@ static bool inside_linear_region(u64 start, u64 size)
         * address range mapped by the linear map, the start address should
         * be calculated using vabits_actual.
         */
-       return ((start >= __pa(_PAGE_OFFSET(vabits_actual)))
-                       && ((start + size) <= __pa(PAGE_END - 1)));
+       return __is_lm_address(__va(start)) && __is_lm_address(__va(start + size));
 }
 
 int arch_add_memory(int nid, u64 start, u64 size,