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This reverts commit8df441294d("pipe: Check for ring full inside of the spinlock in pipe_write()") which was obsoleted by commitc73be61ced("pipe: Add general notification queue support") because now pipe_write() fails early with -EXDEV if there is a watch_queue. Without a watch_queue, no notifications can be posted to the pipe and mutex protection is enough, as can be seen in splice_pipe_to_pipe() which does not use the spinlock either. Signed-off-by: Max Kellermann <max.kellermann@ionos.com> Message-Id: <20230921075755.1378787-3-max.kellermann@ionos.com> Reviewed-by: David Howells <dhowells@redhat.com> Signed-off-by: Christian Brauner <brauner@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.