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Currently, rcu_barrier_tasks(), rcu_barrier_tasks_rude(), and rcu_barrier_tasks_trace() simply invoke the corresponding synchronize_rcu_tasks*() function. This works because there is only one callback queue. However, there will soon be multiple callback queues. This commit therefore scans the queues currently in use, entraining a callback on each non-empty queue. Sequence numbers and reference counts are used to synchronize this process in a manner similar to the approach taken by rcu_barrier(). Reported-by: Martin Lau <kafai@fb.com> Cc: Neeraj Upadhyay <neeraj.iitr10@gmail.com> Signed-off-by: Paul E. McKenney <paulmck@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.