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[ upstream commitcd65869512] The issue was first described and addressed in89c2b3b749("io_uring: reexpand under-reexpanded iters"), but shortly after reimplemented as.cd65869512("io_uring: use iov_iter state save/restore helpers"). Here we follow the approach from the second patch but without in-callback resubmissions, fixups for not yet supported in 5.10 short read retries and replacing iov_iter_state with iter copies to not pull even more dependencies, and because it's just much simpler. Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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.