1947 	struct uffdio_api uffdio_api;  in userfaultfd_api()  local
1954 	if (copy_from_user(&uffdio_api, buf, sizeof(uffdio_api)))  in userfaultfd_api()
1956 	features = uffdio_api.features;  in userfaultfd_api()
1958 	if (uffdio_api.api != UFFD_API)  in userfaultfd_api()
1969 	uffdio_api.features = UFFD_API_FEATURES;  in userfaultfd_api()
1971 	uffdio_api.features &=  in userfaultfd_api()
1975 	uffdio_api.features &= ~UFFD_FEATURE_PAGEFAULT_FLAG_WP;  in userfaultfd_api()
1978 	uffdio_api.features &= ~UFFD_FEATURE_WP_HUGETLBFS_SHMEM;  in userfaultfd_api()
1979 	uffdio_api.features &= ~UFFD_FEATURE_WP_UNPOPULATED;  in userfaultfd_api()
1980 	uffdio_api.features &= ~UFFD_FEATURE_WP_ASYNC;  in userfaultfd_api()
1984 	if (features & ~uffdio_api.features)  in userfaultfd_api()
1987 	uffdio_api.ioctls = UFFD_API_IOCTLS;  in userfaultfd_api()
1989 	if (copy_to_user(buf, &uffdio_api, sizeof(uffdio_api)))  in userfaultfd_api()
2002 	memset(&uffdio_api, 0, sizeof(uffdio_api));  in userfaultfd_api()
2003 	if (copy_to_user(buf, &uffdio_api, sizeof(uffdio_api)))  in userfaultfd_api()