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75c299a917
Add a refcount to struct io_zcrx_ifq to reverse the refcounting relationship i.e. rings now reference ifqs instead. As a result of this, remove ctx->refs that an ifq holds on a ring via the page pool memory provider. This ref ifq->refs is held by internal users of an ifq, namely rings and the page pool memory provider associated with an ifq. This is needed to keep the ifq around until the page pool is destroyed. Since ifqs now no longer hold refs to ring ctx, there isn't a need to split the cleanup of ifqs into two: io_shutdown_zcrx_ifqs() in io_ring_exit_work() while waiting for ctx->refs to drop to 0, and io_unregister_zcrx_ifqs() after. Remove io_shutdown_zcrx_ifqs(). Signed-off-by: David Wei <dw@davidwei.uk> Co-developed-by: Pavel Begunkov <asml.silence@gmail.com> Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Reviewed-by: Pavel Begunkov <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 reStructuredText 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.