1572 static long kernel_waitid(int which, pid_t upid, struct waitid_info *infop,  in kernel_waitid()  argument
1593 		if (upid <= 0)  in kernel_waitid()
1596 		pid = find_get_pid(upid);  in kernel_waitid()
1600 		if (upid < 0)  in kernel_waitid()
1603 		if (upid)  in kernel_waitid()
1604 			pid = find_get_pid(upid);  in kernel_waitid()
1610 		if (upid < 0)  in kernel_waitid()
1613 		pid = pidfd_get_pid(upid, &f_flags);  in kernel_waitid()
1638 SYSCALL_DEFINE5(waitid, int, which, pid_t, upid, struct siginfo __user *,  in SYSCALL_DEFINE5()  argument
1643 	long err = kernel_waitid(which, upid, &info, options, ru ? &r : NULL);  in SYSCALL_DEFINE5()
1671 long kernel_wait4(pid_t upid, int __user *stat_addr, int options,  in kernel_wait4()  argument
1684 	if (upid == INT_MIN)  in kernel_wait4()
1687 	if (upid == -1)  in kernel_wait4()
1689 	else if (upid < 0) {  in kernel_wait4()
1691 		pid = find_get_pid(-upid);  in kernel_wait4()
1692 	} else if (upid == 0) {  in kernel_wait4()
1697 		pid = find_get_pid(upid);  in kernel_wait4()
1730 SYSCALL_DEFINE4(wait4, pid_t, upid, int __user *, stat_addr,  in SYSCALL_DEFINE4()  argument
1734 	long err = kernel_wait4(upid, stat_addr, options, ru ? &r : NULL);  in SYSCALL_DEFINE4()