[PATCH v2 0/5] ntsync miscellaneous patches

This is a resend of a series originally submitted as [1], combined with two
patches originally sent as [2].

This supersedes a previous set of patches sent as [3].

The following is the original cover letter sent with the series at [1].

[1] https://lore.kernel.org/all/20260628024239.152852-1-ivanrwcm25@gmail.com/ (local)
[2] https://lore.kernel.org/all/20260720175402.44338-1-ivanrwcm25@gmail.com/ (local)
[3] https://lore.kernel.org/all/20260720171740.447035-1-zfigura@codeweavers.com/ (local)

===

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 (5):
  selftests: ntsync: fix wake_all CREATE_EVENT fd expectation
  selftests: ntsync: add wait argument validation tests
  ntsync: reject wait ioctls with zero owner
  docs: ntsync: align ioctl names and struct layouts with uapi
  selftests: ntsync: test absolute MONOTONIC waits under time namespaces

 Documentation/userspace-api/ntsync.rst        |  33 ++---
 drivers/misc/ntsync.c                         |   3 +
 .../testing/selftests/drivers/ntsync/ntsync.c | 133 +++++++++++++++++-
 3 files changed, 152 insertions(+), 17 deletions(-)


base-commit: 2cedf2272f1bb42471e646868ac572cc5752bd91
-- 
2.53.0