1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
176 	 * with UFFDIO_REGISTER_MODE_MISSING mode will succeed on
191 	 *    it, so userland can later check if the feature flag is
199 	 * UFFD_FEATURE_SIGBUS feature means no page-fault
208 	 * hugetlbfs-backed pages.
211 	 * UFFD_FEATURE_MINOR_HUGETLBFS, but for shmem-backed pages instead.
218 	 * write-protection mode is supported on both shmem and hugetlbfs.
221 	 * write-protection mode will always apply to unpopulated pages
223 	 * & hugetlbfs, so this flag only affects anonymous memory behavior
224 	 * when userfault write-protection mode is registered.
226 	 * UFFD_FEATURE_WP_ASYNC indicates that userfaultfd write-protection
227 	 * asynchronous mode is supported in which the write fault is
228 	 * automatically resolved and write-protection is un-set.
266 	__u64 mode;  member
287 	__u64 mode;  member
299 	__u64 mode;  member
311  * UFFDIO_WRITEPROTECT_MODE_WP: set the flag to write protect a range,
312  * unset the flag to undo protection of a range which was previously
315  * UFFDIO_WRITEPROTECT_MODE_DONTWAKE: set the flag to avoid waking up
319  * therefore DONTWAKE flag is meaningless with WP=1.  Removing write
325 	__u64 mode;  member
338 	__u64 mode;  member
350 	__u64 mode;  member
369 	__u64 mode;  member
382  * Create a userfaultfd that can handle page faults only in user mode.