Shuffle the cond_syscall() entries in kernel/sys_ni.c around so that they
are kept in the same order as in include/uapi/asm-generic/unistd.h. For
better structuring, add the same comments as in that file, but keep a few
additional comments and extend the commentary where it seems useful.

Signed-off-by: Dominik Brodowski <li...@dominikbrodowski.net>

diff --git a/kernel/sys_ni.c b/kernel/sys_ni.c
index b5189762d275..44c65e4d2528 100644
--- a/kernel/sys_ni.c
+++ b/kernel/sys_ni.c
@@ -17,245 +17,403 @@ asmlinkage long sys_ni_syscall(void)
        return -ENOSYS;
 }
 
-cond_syscall(sys_quotactl);
-cond_syscall(sys32_quotactl);
-cond_syscall(sys_acct);
+/*
+ * This list is kept in the same order as include/uapi/asm-generic/unistd.h.
+ * Architecture specific entries go below, then follow deprecated or obsolote
+ * system calls.
+ */
+
+cond_syscall(sys_io_setup);
+cond_syscall(compat_sys_io_setup);
+cond_syscall(sys_io_destroy);
+cond_syscall(sys_io_submit);
+cond_syscall(compat_sys_io_submit);
+cond_syscall(sys_io_cancel);
+cond_syscall(sys_io_getevents);
+cond_syscall(compat_sys_io_getevents);
+
+/* fs/xattr.c */
+
+/* fs/dcache.c */
+
+/* fs/cookies.c */
 cond_syscall(sys_lookup_dcookie);
 cond_syscall(compat_sys_lookup_dcookie);
-cond_syscall(sys_swapon);
-cond_syscall(sys_swapoff);
+
+/* fs/eventfd.c */
+cond_syscall(sys_eventfd2);
+
+/* fs/eventfd.c */
+cond_syscall(sys_epoll_create1);
+cond_syscall(sys_epoll_ctl);
+cond_syscall(sys_epoll_pwait);
+cond_syscall(compat_sys_epoll_pwait);
+
+/* fs/fcntl.c */
+
+/* fs/inotify_user.c */
+cond_syscall(sys_inotify_init1);
+cond_syscall(sys_inotify_add_watch);
+cond_syscall(sys_inotify_rm_watch);
+
+/* fs/ioctl.c */
+
+/* fs/ioprio.c */
+cond_syscall(sys_ioprio_set);
+cond_syscall(sys_ioprio_get);
+
+/* fs/locks.c */
+cond_syscall(sys_flock);
+
+/* fs/namei.c */
+
+/* fs/namespace.c */
+
+/* fs/nfsctl.c */
+
+/* fs/open.c */
+
+/* fs/pipe.c */
+
+/* fs/quota.c */
+cond_syscall(sys_quotactl);
+
+/* fs/readdir.c */
+
+/* fs/read_write.c */
+
+/* fs/sendfile.c */
+
+/* fs/select.c */
+
+/* fs/signalfd.c */
+cond_syscall(sys_signalfd4);
+cond_syscall(compat_sys_signalfd4);
+
+/* fs/splice.c */
+
+/* fs/stat.c */
+
+/* fs/sync.c */
+
+/* fs/timerfd.c */
+cond_syscall(sys_timerfd_create);
+cond_syscall(sys_timerfd_settime);
+cond_syscall(compat_sys_timerfd_settime);
+cond_syscall(sys_timerfd_gettime);
+cond_syscall(compat_sys_timerfd_gettime);
+
+/* fs/utimes.c */
+
+/* kernel/acct.c */
+cond_syscall(sys_acct);
+
+/* kernel/capability.c */
+cond_syscall(sys_capget);
+cond_syscall(sys_capset);
+
+/* kernel/exec_domain.c */
+
+/* kernel/exit.c */
+
+/* kernel/fork.c */
+
+/* kernel/futex.c */
+cond_syscall(sys_futex);
+cond_syscall(compat_sys_futex);
+cond_syscall(sys_set_robust_list);
+cond_syscall(compat_sys_set_robust_list);
+cond_syscall(sys_get_robust_list);
+cond_syscall(compat_sys_get_robust_list);
+
+/* kernel/hrtimer.c */
+
+/* kernel/itimer.c */
+
+/* kernel/kexec.c */
 cond_syscall(sys_kexec_load);
 cond_syscall(compat_sys_kexec_load);
-cond_syscall(sys_kexec_file_load);
+
+/* kernel/module.c */
 cond_syscall(sys_init_module);
-cond_syscall(sys_finit_module);
 cond_syscall(sys_delete_module);
+
+/* kernel/posix-timers.c */
+
+/* kernel/printk.c */
+cond_syscall(sys_syslog);
+
+/* kernel/ptrace.c */
+
+/* kernel/sched/core.c */
+
+/* kernel/signal.c */
+
+/* kernel/sys.c */
+cond_syscall(sys_setregid);
+cond_syscall(sys_setgid);
+cond_syscall(sys_setreuid);
+cond_syscall(sys_setuid);
+cond_syscall(sys_setresuid);
+cond_syscall(sys_getresuid);
+cond_syscall(sys_setresgid);
+cond_syscall(sys_getresgid);
+cond_syscall(sys_setfsuid);
+cond_syscall(sys_setfsgid);
+cond_syscall(sys_setgroups);
+cond_syscall(sys_getgroups);
+
+/* kernel/time.c */
+
+/* kernel/timer.c */
+
+/* ipc/mqueue.c */
+cond_syscall(sys_mq_open);
+cond_syscall(compat_sys_mq_open);
+cond_syscall(sys_mq_unlink);
+cond_syscall(sys_mq_timedsend);
+cond_syscall(compat_sys_mq_timedsend);
+cond_syscall(sys_mq_timedreceive);
+cond_syscall(compat_sys_mq_timedreceive);
+cond_syscall(sys_mq_notify);
+cond_syscall(compat_sys_mq_notify);
+cond_syscall(sys_mq_getsetattr);
+cond_syscall(compat_sys_mq_getsetattr);
+
+/* ipc/msg.c */
+cond_syscall(sys_msgget);
+cond_syscall(sys_msgctl);
+cond_syscall(compat_sys_msgctl);
+cond_syscall(sys_msgrcv);
+cond_syscall(compat_sys_msgrcv);
+cond_syscall(sys_msgsnd);
+cond_syscall(compat_sys_msgsnd);
+
+/* ipc/sem.c */
+cond_syscall(sys_semget);
+cond_syscall(sys_semctl);
+cond_syscall(compat_sys_semctl);
+cond_syscall(sys_semtimedop);
+cond_syscall(compat_sys_semtimedop);
+cond_syscall(sys_semop);
+
+/* ipc/shm.c */
+cond_syscall(sys_shmget);
+cond_syscall(sys_shmctl);
+cond_syscall(compat_sys_shmctl);
+cond_syscall(sys_shmat);
+cond_syscall(compat_sys_shmat);
+cond_syscall(sys_shmdt);
+
+/* net/socket.c */
+cond_syscall(sys_socket);
 cond_syscall(sys_socketpair);
 cond_syscall(sys_bind);
 cond_syscall(sys_listen);
 cond_syscall(sys_accept);
-cond_syscall(sys_accept4);
 cond_syscall(sys_connect);
 cond_syscall(sys_getsockname);
 cond_syscall(sys_getpeername);
-cond_syscall(sys_sendto);
-cond_syscall(sys_send);
-cond_syscall(sys_recvfrom);
-cond_syscall(sys_recv);
-cond_syscall(sys_socket);
 cond_syscall(sys_setsockopt);
 cond_syscall(compat_sys_setsockopt);
 cond_syscall(sys_getsockopt);
 cond_syscall(compat_sys_getsockopt);
+cond_syscall(sys_sendto);
 cond_syscall(sys_shutdown);
+cond_syscall(sys_recvfrom);
+cond_syscall(compat_sys_recvfrom);
 cond_syscall(sys_sendmsg);
-cond_syscall(sys_sendmmsg);
 cond_syscall(compat_sys_sendmsg);
-cond_syscall(compat_sys_sendmmsg);
 cond_syscall(sys_recvmsg);
-cond_syscall(sys_recvmmsg);
 cond_syscall(compat_sys_recvmsg);
-cond_syscall(compat_sys_recv);
-cond_syscall(compat_sys_recvfrom);
-cond_syscall(compat_sys_recvmmsg);
-cond_syscall(sys_socketcall);
-cond_syscall(sys_futex);
-cond_syscall(compat_sys_futex);
-cond_syscall(sys_set_robust_list);
-cond_syscall(compat_sys_set_robust_list);
-cond_syscall(sys_get_robust_list);
-cond_syscall(compat_sys_get_robust_list);
-cond_syscall(sys_epoll_create);
-cond_syscall(sys_epoll_create1);
-cond_syscall(sys_epoll_ctl);
-cond_syscall(sys_epoll_wait);
-cond_syscall(sys_epoll_pwait);
-cond_syscall(compat_sys_epoll_pwait);
-cond_syscall(sys_semget);
-cond_syscall(sys_semop);
-cond_syscall(sys_semtimedop);
-cond_syscall(compat_sys_semtimedop);
-cond_syscall(sys_semctl);
-cond_syscall(compat_sys_semctl);
-cond_syscall(sys_msgget);
-cond_syscall(sys_msgsnd);
-cond_syscall(compat_sys_msgsnd);
-cond_syscall(sys_msgrcv);
-cond_syscall(compat_sys_msgrcv);
-cond_syscall(sys_msgctl);
-cond_syscall(compat_sys_msgctl);
-cond_syscall(sys_shmget);
-cond_syscall(sys_shmat);
-cond_syscall(compat_sys_shmat);
-cond_syscall(sys_shmdt);
-cond_syscall(sys_shmctl);
-cond_syscall(compat_sys_shmctl);
-cond_syscall(sys_mq_open);
-cond_syscall(sys_mq_unlink);
-cond_syscall(sys_mq_timedsend);
-cond_syscall(sys_mq_timedreceive);
-cond_syscall(sys_mq_notify);
-cond_syscall(sys_mq_getsetattr);
-cond_syscall(compat_sys_mq_open);
-cond_syscall(compat_sys_mq_timedsend);
-cond_syscall(compat_sys_mq_timedreceive);
-cond_syscall(compat_sys_mq_notify);
-cond_syscall(compat_sys_mq_getsetattr);
-cond_syscall(sys_mbind);
-cond_syscall(sys_get_mempolicy);
-cond_syscall(sys_set_mempolicy);
-cond_syscall(compat_sys_mbind);
-cond_syscall(compat_sys_get_mempolicy);
-cond_syscall(compat_sys_set_mempolicy);
+
+/* mm/filemap.c */
+
+/* mm/nommu.c, also with MMU */
+cond_syscall(sys_mremap);
+
+/* security/keys/keyctl.c */
 cond_syscall(sys_add_key);
 cond_syscall(sys_request_key);
 cond_syscall(sys_keyctl);
 cond_syscall(compat_sys_keyctl);
-cond_syscall(compat_sys_socketcall);
-cond_syscall(sys_inotify_init);
-cond_syscall(sys_inotify_init1);
-cond_syscall(sys_inotify_add_watch);
-cond_syscall(sys_inotify_rm_watch);
-cond_syscall(sys_migrate_pages);
-cond_syscall(sys_move_pages);
-cond_syscall(sys_chown16);
-cond_syscall(sys_fchown16);
-cond_syscall(sys_getegid16);
-cond_syscall(sys_geteuid16);
-cond_syscall(sys_getgid16);
-cond_syscall(sys_getgroups16);
-cond_syscall(sys_getresgid16);
-cond_syscall(sys_getresuid16);
-cond_syscall(sys_getuid16);
-cond_syscall(sys_lchown16);
-cond_syscall(sys_setfsgid16);
-cond_syscall(sys_setfsuid16);
-cond_syscall(sys_setgid16);
-cond_syscall(sys_setgroups16);
-cond_syscall(sys_setregid16);
-cond_syscall(sys_setresgid16);
-cond_syscall(sys_setresuid16);
-cond_syscall(sys_setreuid16);
-cond_syscall(sys_setuid16);
-cond_syscall(sys_sgetmask);
-cond_syscall(sys_ssetmask);
-cond_syscall(sys_vm86old);
-cond_syscall(sys_vm86);
-cond_syscall(sys_modify_ldt);
-cond_syscall(sys_ipc);
-cond_syscall(compat_sys_ipc);
-cond_syscall(compat_sys_sysctl);
-cond_syscall(sys_flock);
-cond_syscall(sys_io_setup);
-cond_syscall(sys_io_destroy);
-cond_syscall(sys_io_submit);
-cond_syscall(sys_io_cancel);
-cond_syscall(sys_io_getevents);
-cond_syscall(compat_sys_io_setup);
-cond_syscall(compat_sys_io_submit);
-cond_syscall(compat_sys_io_getevents);
-cond_syscall(sys_sysfs);
-cond_syscall(sys_syslog);
-cond_syscall(sys_process_vm_readv);
-cond_syscall(sys_process_vm_writev);
-cond_syscall(compat_sys_process_vm_readv);
-cond_syscall(compat_sys_process_vm_writev);
-cond_syscall(sys_uselib);
-cond_syscall(sys_fadvise64);
-cond_syscall(sys_fadvise64_64);
-cond_syscall(sys_madvise);
-cond_syscall(sys_setuid);
-cond_syscall(sys_setregid);
-cond_syscall(sys_setgid);
-cond_syscall(sys_setreuid);
-cond_syscall(sys_setresuid);
-cond_syscall(sys_getresuid);
-cond_syscall(sys_setresgid);
-cond_syscall(sys_getresgid);
-cond_syscall(sys_setgroups);
-cond_syscall(sys_getgroups);
-cond_syscall(sys_setfsuid);
-cond_syscall(sys_setfsgid);
-cond_syscall(sys_capget);
-cond_syscall(sys_capset);
-cond_syscall(sys_copy_file_range);
 
-/* arch-specific weak syscall entries */
-cond_syscall(sys_pciconfig_read);
-cond_syscall(sys_pciconfig_write);
-cond_syscall(sys_pciconfig_iobase);
-cond_syscall(compat_sys_s390_ipc);
-cond_syscall(ppc_rtas);
-cond_syscall(sys_spu_run);
-cond_syscall(sys_spu_create);
-cond_syscall(sys_subpage_prot);
-cond_syscall(sys_s390_pci_mmio_read);
-cond_syscall(sys_s390_pci_mmio_write);
+/* arch/example/kernel/sys_example.c */
 
-/* mmu depending weak syscall entries */
+/* mm/fadvise.c */
+cond_syscall(sys_fadvise64_64);
+
+/* mm/, CONFIG_MMU only */
+cond_syscall(sys_swapon);
+cond_syscall(sys_swapoff);
 cond_syscall(sys_mprotect);
 cond_syscall(sys_msync);
 cond_syscall(sys_mlock);
 cond_syscall(sys_munlock);
 cond_syscall(sys_mlockall);
 cond_syscall(sys_munlockall);
-cond_syscall(sys_mlock2);
 cond_syscall(sys_mincore);
 cond_syscall(sys_madvise);
-cond_syscall(sys_mremap);
 cond_syscall(sys_remap_file_pages);
-cond_syscall(compat_sys_move_pages);
+cond_syscall(sys_mbind);
+cond_syscall(compat_sys_mbind);
+cond_syscall(sys_get_mempolicy);
+cond_syscall(compat_sys_get_mempolicy);
+cond_syscall(sys_set_mempolicy);
+cond_syscall(compat_sys_set_mempolicy);
+cond_syscall(sys_migrate_pages);
 cond_syscall(compat_sys_migrate_pages);
+cond_syscall(sys_move_pages);
+cond_syscall(compat_sys_move_pages);
 
-/* block-layer dependent */
-cond_syscall(sys_bdflush);
-cond_syscall(sys_ioprio_set);
-cond_syscall(sys_ioprio_get);
-
-/* New file descriptors */
-cond_syscall(sys_signalfd);
-cond_syscall(sys_signalfd4);
-cond_syscall(compat_sys_signalfd);
-cond_syscall(compat_sys_signalfd4);
-cond_syscall(sys_timerfd_create);
-cond_syscall(sys_timerfd_settime);
-cond_syscall(sys_timerfd_gettime);
-cond_syscall(compat_sys_timerfd_settime);
-cond_syscall(compat_sys_timerfd_gettime);
-cond_syscall(sys_eventfd);
-cond_syscall(sys_eventfd2);
-cond_syscall(sys_memfd_create);
-cond_syscall(sys_userfaultfd);
-
-/* performance counters: */
 cond_syscall(sys_perf_event_open);
+cond_syscall(sys_accept4);
+cond_syscall(sys_recvmmsg);
+cond_syscall(compat_sys_recvmmsg);
+
+/*
+ * Architecture specific syscalls: see further below
+ */
 
-/* fanotify! */
+/* fanotify */
 cond_syscall(sys_fanotify_init);
 cond_syscall(sys_fanotify_mark);
-cond_syscall(compat_sys_fanotify_mark);
 
 /* open by handle */
 cond_syscall(sys_name_to_handle_at);
 cond_syscall(sys_open_by_handle_at);
 cond_syscall(compat_sys_open_by_handle_at);
 
+cond_syscall(sys_sendmmsg);
+cond_syscall(compat_sys_sendmmsg);
+cond_syscall(sys_process_vm_readv);
+cond_syscall(compat_sys_process_vm_readv);
+cond_syscall(sys_process_vm_writev);
+cond_syscall(compat_sys_process_vm_writev);
+
 /* compare kernel pointers */
 cond_syscall(sys_kcmp);
 
+cond_syscall(sys_finit_module);
+
 /* operate on Secure Computing state */
 cond_syscall(sys_seccomp);
 
+cond_syscall(sys_memfd_create);
+
 /* access BPF programs and maps */
 cond_syscall(sys_bpf);
 
 /* execveat */
 cond_syscall(sys_execveat);
 
+cond_syscall(sys_userfaultfd);
+
 /* membarrier */
 cond_syscall(sys_membarrier);
 
+cond_syscall(sys_mlock2);
+
+cond_syscall(sys_copy_file_range);
+
 /* memory protection keys */
 cond_syscall(sys_pkey_mprotect);
 cond_syscall(sys_pkey_alloc);
 cond_syscall(sys_pkey_free);
+
+
+/*
+ * Architecture specific weak syscall entries.
+ */
+
+/* pciconfig: alpha, arm, arm64, ia64, sparc */
+cond_syscall(sys_pciconfig_read);
+cond_syscall(sys_pciconfig_write);
+cond_syscall(sys_pciconfig_iobase);
+
+/* sys_socketcall: arm, mips, x86, ... */
+cond_syscall(sys_socketcall);
+cond_syscall(compat_sys_socketcall);
+
+/* compat syscalls for arm64, x86, ... */
+cond_syscall(compat_sys_sysctl);
+cond_syscall(compat_sys_fanotify_mark);
+
+/* x86 */
+cond_syscall(sys_vm86old);
+cond_syscall(sys_modify_ldt);
+cond_syscall(sys32_quotactl);
+cond_syscall(sys_vm86);
+cond_syscall(sys_kexec_file_load);
+
+/* s390 */
+cond_syscall(sys_s390_pci_mmio_read);
+cond_syscall(sys_s390_pci_mmio_write);
+cond_syscall(compat_sys_s390_ipc);
+
+/* powerpc */
+cond_syscall(ppc_rtas);
+cond_syscall(sys_spu_run);
+cond_syscall(sys_spu_create);
+cond_syscall(sys_subpage_prot);
+
+
+/*
+ * Deprecated system calls whcih are still defined in
+ * include/uapi/asm-generic/unistd.h and wanted by >= 1 arch
+ */
+
+/* __ARCH_WANT_SYSCALL_NO_FLAGS */
+cond_syscall(sys_epoll_create);
+cond_syscall(sys_inotify_init);
+cond_syscall(sys_eventfd);
+cond_syscall(sys_signalfd);
+cond_syscall(compat_sys_signalfd);
+
+/* __ARCH_WANT_SYSCALL_OFF_T */
+cond_syscall(sys_fadvise64);
+
+/* __ARCH_WANT_SYSCALL_DEPRECATED */
+cond_syscall(sys_epoll_wait);
+cond_syscall(sys_recv);
+cond_syscall(compat_sys_recv);
+cond_syscall(sys_send);
+cond_syscall(sys_recv);
+cond_syscall(sys_uselib);
+
+
+/*
+ * The syscalls below are not found in include/uapi/asm-generic/unistd.h
+ */
+
+/* obsolete: SGETMASK_SYSCALL */
+cond_syscall(sys_sgetmask);
+cond_syscall(sys_ssetmask);
+
+/* obsolete: SYSFS_SYSCALL */
+cond_syscall(sys_sysfs);
+
+/* obsolete: __ARCH_WANT_SYS_IPC */
+cond_syscall(sys_ipc);
+cond_syscall(compat_sys_ipc);
+
+/* obsolete: UID16 */
+cond_syscall(sys_chown16);
+cond_syscall(sys_fchown16);
+cond_syscall(sys_getegid16);
+cond_syscall(sys_geteuid16);
+cond_syscall(sys_getgid16);
+cond_syscall(sys_getgroups16);
+cond_syscall(sys_getresgid16);
+cond_syscall(sys_getresuid16);
+cond_syscall(sys_getuid16);
+cond_syscall(sys_lchown16);
+cond_syscall(sys_setfsgid16);
+cond_syscall(sys_setfsuid16);
+cond_syscall(sys_setgid16);
+cond_syscall(sys_setgroups16);
+cond_syscall(sys_setregid16);
+cond_syscall(sys_setresgid16);
+cond_syscall(sys_setresuid16);
+cond_syscall(sys_setreuid16);
+cond_syscall(sys_setuid16);

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