This is a resend of a series originally submitted as [1], now sent to char-misc. The following is the original cover letter sent with that series. [1] https://lore.kernel.org/all/20260628024239.152852-1-ivanrwcm25@gmail.com/ === This series improves ntsync without changing wait/wake semantics: 1/4 — Align Documentation/userspace-api/ntsync.rst with include/uapi/linux/ntsync.h (ioctl macro names and struct layout). 2/4 — Fix wake_all selftest: CREATE_EVENT returns an fd, not zero. 3/4 — Add selftests for documented EINVAL cases (zero owner, non-zero pad, cross-instance object use). 4/4 — Reject wait ioctls when owner is zero, matching the documented uAPI (3/4 depends on 4/4 for the owner tests). Patch 4/4 closes a spec gap: Documentation/userspace-api/ntsync.rst requires EINVAL when wait owner is zero, but setup_wait() only validated pad and flags. Unlock/kill mutex ioctls already reject owner == 0. Testing: - scripts/checkpatch.pl --strict --no-tree: clean (4/4 patches) - make headers && make -C tools/testing/selftests TARGETS=drivers/ntsync - Kernel 7.1.0-ntsync-test+ (CONFIG_NTSYNC=y), QEMU x86_64 initramfs: tools/testing/selftests/drivers/ntsync/ntsync — 12/12 PASS, including wake_all and wait_args_validation - On 6.17.0-35-generic with the distro ntsync.ko (without patch 4/4): wait_args_validation fails on owner==0 (wait proceeds instead of EINVAL), confirming the gap this series fixes Iván Ezequiel Rodriguez (4): docs: ntsync: align uAPI ioctl names and struct layout with ntsync.h selftests: ntsync: fix wake_all CREATE_EVENT fd expectation selftests: ntsync: add wait argument validation tests ntsync: reject wait ioctls with zero owner Documentation/userspace-api/ntsync.rst | 22 ++++----- drivers/misc/ntsync.c | 3 ++ .../testing/selftests/drivers/ntsync/ntsync.c | 46 ++++++++++++++++++- 3 files changed, 59 insertions(+), 12 deletions(-) base-commit: 2cedf2272f1bb42471e646868ac572cc5752bd91 -- 2.53.0