PERF_REG_ARM64_X21   63 tools/perf/arch/arm64/include/perf_regs.h 	case PERF_REG_ARM64_X21:
PERF_REG_ARM64_X21   57 tools/perf/arch/arm64/util/unwind-libunwind.c 		return PERF_REG_ARM64_X21;