ACPI_TABLE_UPGRADE_MAX_PHYS  168 arch/arm64/include/asm/acpi.h #define ACPI_TABLE_UPGRADE_MAX_PHYS MEMBLOCK_ALLOC_ACCESSIBLE
ACPI_TABLE_UPGRADE_MAX_PHYS  185 arch/x86/include/asm/acpi.h #define ACPI_TABLE_UPGRADE_MAX_PHYS (max_low_pfn_mapped << PAGE_SHIFT)