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A full memory barrier is necessary at the end of the expedited grace period to order: 1) The grace period completion (pictured by the GP sequence number) with all preceding accesses. This pairs with rcu_seq_end() performed by the concurrent kworker. 2) The grace period completion and subsequent post-GP update side accesses. Pairs again against rcu_seq_end(). This full barrier is already provided by the final sync_exp_work_done() test, making the subsequent explicit one redundant. Remove it and improve comments. Signed-off-by: Frederic Weisbecker <frederic@kernel.org> Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Reviewed-by: Boqun Feng <boqun.feng@gmail.com> Reviewed-by: Neeraj Upadhyay <neeraj.upadhyay@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 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.