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5562a8d71a
Current IOSQE_IO_DRAIN implementation doesn't work well with CQE skipping and it's not allowed, otherwise some requests might be not executed until the ring is destroyed and the userspace would hang. Let's fail all drain requests after seeing IOSQE_CQE_SKIP_SUCCESS at least once. All drained requests prior to that will get run normally, so there should be no stalls. However, even though such mixing wouldn't lead to issues at the moment, it's still not allowed as the behaviour may change. Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Link: https://lore.kernel.org/r/bcf7164f8bf3eb54b7bb7b4fd119907fa4d4d43b.1636559119.git.asml.silence@gmail.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
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.