Possibly unhandled system calls in Linux kernel 5.10

Found some unhandled system calls while updated Ubuntu CI to 20.04 in #4953 (closed).

On my local system, which is Linux kernel 5.10.46, following system calls are new:

x86-64:

+#    define __NR_pidfd_send_signal 424
+#    define __NR_io_uring_setup 425
+#    define __NR_io_uring_enter 426
+#    define __NR_io_uring_register 427
+#    define __NR_open_tree 428
+#    define __NR_move_mount 429
+#    define __NR_fsopen 430
+#    define __NR_fsconfig 431
+#    define __NR_fsmount 432
+#    define __NR_fspick 433
+#    define __NR_pidfd_open 434
+#    define __NR_clone3 435
+#    define __NR_close_range 436
+#    define __NR_openat2 437
+#    define __NR_pidfd_getfd 438
+#    define __NR_faccessat2 439
+#    define __NR_process_madvise 440

x86-32:

+#    define __NR_semget 393
+#    define __NR_semctl 394
+#    define __NR_shmget 395
+#    define __NR_shmctl 396
+#    define __NR_shmat 397
+#    define __NR_shmdt 398
+#    define __NR_msgget 399
+#    define __NR_msgsnd 400
+#    define __NR_msgrcv 401
+#    define __NR_msgctl 402
+#    define __NR_clock_gettime64 403
+#    define __NR_clock_settime64 404
+#    define __NR_clock_adjtime64 405
+#    define __NR_clock_getres_time64 406
+#    define __NR_clock_nanosleep_time64 407
+#    define __NR_timer_gettime64 408
+#    define __NR_timer_settime64 409
+#    define __NR_timerfd_gettime64 410
+#    define __NR_timerfd_settime64 411
+#    define __NR_utimensat_time64 412
+#    define __NR_pselect6_time64 413
+#    define __NR_ppoll_time64 414
+#    define __NR_io_pgetevents_time64 416
+#    define __NR_recvmmsg_time64 417
+#    define __NR_mq_timedsend_time64 418
+#    define __NR_mq_timedreceive_time64 419
+#    define __NR_semtimedop_time64 420
+#    define __NR_rt_sigtimedwait_time64 421
+#    define __NR_futex_time64 422
+#    define __NR_sched_rr_get_interval_time64 423
+#    define __NR_pidfd_send_signal 424
+#    define __NR_io_uring_setup 425
+#    define __NR_io_uring_enter 426
+#    define __NR_io_uring_register 427
+#    define __NR_open_tree 428
+#    define __NR_move_mount 429
+#    define __NR_fsopen 430
+#    define __NR_fsconfig 431
+#    define __NR_fsmount 432
+#    define __NR_fspick 433
+#    define __NR_pidfd_open 434
+#    define __NR_clone3 435
+#    define __NR_close_range 436
+#    define __NR_openat2 437
+#    define __NR_pidfd_getfd 438
+#    define __NR_faccessat2 439
+#    define __NR_process_madvise 440