P_PID            1508 kernel/exit.c  	case P_PID:
P_PID              45 tools/testing/selftests/powerpc/ptrace/ptrace-syscall.c 	if (waitid(P_PID, chld, &si, WEXITED|WSTOPPED) != 0)
P_PID              87 tools/testing/selftests/x86/ptrace_syscall.c 	if (waitid(P_PID, chld, &si, WEXITED|WSTOPPED) != 0)