MPIDR_LEVEL_BITS   54 arch/arm/include/asm/cputype.h #define MPIDR_LEVEL_BITS 8
MPIDR_LEVEL_BITS   15 arch/arm64/include/asm/cputype.h #define MPIDR_LEVEL_BITS	(1 << MPIDR_LEVEL_BITS_SHIFT)