On Tue, 29 Aug 2023 12:00:29 +0800, Xueshi Hu wrote:

In folio_mark_dirty(), it can automatically fallback to
noop_dirty_folio() if a_ops->dirty_folio is not registered.

In anon_aops, dev_dax_aops and fb_deferred_io_aops, replacing .dirty_folio
with NULL makes them identical to default (empty_aops) and since we never
compare ->a_ops pointer with either of those, we can remove them
completely.

[...]

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

[1/1] fs: clean up usage of noop_dirty_folio
      https://git.kernel.org/vfs/vfs/c/ffb2bc01caae