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Pavel Begunkov says: ==================== shrink struct ubuf_info struct ubuf_info is large but not all fields are needed for all cases. We have limited space in io_uring for it and large ubuf_info prevents some struct embedding, even though we use only a subset of the fields. It's also not very clean trying to use this typeless extra space. Shrink struct ubuf_info to only necessary fields used in generic paths, namely ->callback, ->refcnt and ->flags, which take only 16 bytes. And make MSG_ZEROCOPY and some other users to embed it into a larger struct ubuf_info_msgzc mimicking the former ubuf_info. Note, xen/vhost may also have some cleaning on top by creating new structs containing ubuf_info but with proper types. ==================== Link: https://lore.kernel.org/r/cover.1663892211.git.asml.silence@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.