On Fri, 26 Jan 2024 21:01:05 -0500, Kent Overstreet wrote:

*_lock_nested() is fundamentally broken; lockdep needs to check lock
ordering, but we cannot device a total ordering on an unbounded number
of elements with only a few subclasses.

the replacement is to define lock ordering with a proper comparison
function.

[...]

Applied to the vfs.misc branch of the vfs/vfs.git tree.
Patches in the vfs.misc branch should appear in linux-next soon.

Please report any outstanding bugs that were missed during review in a
new review to the original patch series allowing us to drop it.

It's encouraged to provide Acked-bys and Reviewed-bys even though the
patch has now been applied. If possible patch trailers will be updated.

Note that commit hashes shown below are subject to change due to rebase,
trailer updates or similar. If in doubt, please check the listed branch.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git
branch: vfs.misc

[1/4] fs/pipe: Convert to lockdep_cmp_fn
      https://git.kernel.org/vfs/vfs/c/38b25beb3b67