91 static int uffd = -1;  variable
352 	uffd = syscall(__NR_userfaultfd, O_CLOEXEC | O_NONBLOCK | UFFD_USER_MODE_ONLY);  in userfaultfd_open()
353 	if (uffd < 0)  in userfaultfd_open()
355 	uffd_flags = fcntl(uffd, F_GETFD, NULL);  in userfaultfd_open()
359 	if (ioctl(uffd, UFFDIO_API, &uffdio_api))  in userfaultfd_open()
395 	if (uffd != -1) {  in uffd_test_ctx_clear()
396 		if (close(uffd))  in uffd_test_ctx_clear()
398 		uffd = -1;  in uffd_test_ctx_clear()
629 	int ret = read(uffd, msg, sizeof(*msg));  in uffd_read_msg()
654 		wp_range(uffd, msg->arg.pagefault.address, page_size, false);  in uffd_handle_page_fault()
677 		continue_range(uffd, msg->arg.pagefault.address, page_size);  in uffd_handle_page_fault()
687 		if (copy_page(uffd, offset))  in uffd_handle_page_fault()
702 	pollfd[0].fd = uffd;  in uffd_poll_thread()
718 		if (uffd_read_msg(uffd, &msg))  in uffd_poll_thread()
728 			close(uffd);  in uffd_poll_thread()
729 			uffd = msg.arg.fork.ufd;  in uffd_poll_thread()
730 			pollfd[0].fd = uffd;  in uffd_poll_thread()
736 			if (ioctl(uffd, UFFDIO_UNREGISTER, &uffd_reg.range))  in uffd_poll_thread()
759 		if (uffd_read_msg(uffd, &msg))  in uffd_read_thread()
778 		copy_page_retry(uffd, page_nr * page_size);  in background_thread()
786 		wp_range(uffd, (unsigned long)area_dst + start_nr * page_size,  in background_thread()
794 		copy_page_retry(uffd, page_nr * page_size);  in background_thread()
936 						if (copy_page(uffd, offset))  in faulting_process()
941 						wp_range(uffd,  in faulting_process()
1076 	if (ioctl(uffd, UFFDIO_REGISTER, &uffdio_register))  in userfaultfd_zeropage_test()
1083 	if (uffdio_zeropage(uffd, 0))  in userfaultfd_zeropage_test()
1108 	fcntl(uffd, F_SETFL, uffd_flags | O_NONBLOCK);  in userfaultfd_events_test()
1115 	if (ioctl(uffd, UFFDIO_REGISTER, &uffdio_register))  in userfaultfd_events_test()
1162 	fcntl(uffd, F_SETFL, uffd_flags | O_NONBLOCK);  in userfaultfd_sig_test()
1169 	if (ioctl(uffd, UFFDIO_REGISTER, &uffdio_register))  in userfaultfd_sig_test()
1243 	if (ioctl(uffd, UFFDIO_REGISTER, &uffdio_register))  in userfaultfd_minor_test()
1327 			fcntl(uffd, F_SETFL, uffd_flags | O_NONBLOCK);  in userfaultfd_stress()
1329 			fcntl(uffd, F_SETFL, uffd_flags & ~O_NONBLOCK);  in userfaultfd_stress()
1337 		if (ioctl(uffd, UFFDIO_REGISTER, &uffdio_register))  in userfaultfd_stress()
1347 			if (ioctl(uffd, UFFDIO_REGISTER, &uffdio_register))  in userfaultfd_stress()
1385 			wp_range(uffd, (unsigned long)area_dst,  in userfaultfd_stress()
1389 		if (ioctl(uffd, UFFDIO_UNREGISTER, &uffdio_register.range))  in userfaultfd_stress()
1393 			if (ioctl(uffd, UFFDIO_UNREGISTER,  in userfaultfd_stress()