x21               675 arch/arm64/include/asm/assembler.h 	__frame_regs	x21, x22, \op, 3
x21               112 arch/arm64/include/asm/processor.h 	unsigned long x21;
x21               137 arch/arm64/kernel/kgdb.c 	gdb_regs[21] = cpu_context->x21;