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e75bcd48e2
Now that ->nocb_timer and ->nocb_bypass_timer have become quite similar, this commit merges them together. A new RCU_NOCB_WAKE_BYPASS wake level is introduced. As a result, timers perform all kinds of deferred wake ups but other deferred wakeup callsites only handle non-bypass wakeups in order not to wake up rcuo too early. The timer also unconditionally executes a full barrier so as to order timer_pending() and callback enqueue although the path performing RCU_NOCB_WAKE_FORCE that makes use of it is debatable. It should also test against the rdp leader instead of the current rdp. This unconditional full barrier shouldn't bring visible overhead since these timers almost never fire. Signed-off-by: Frederic Weisbecker <frederic@kernel.org> Cc: Josh Triplett <josh@joshtriplett.org> Cc: Lai Jiangshan <jiangshanlai@gmail.com> Cc: Joel Fernandes <joel@joelfernandes.org> Cc: Neeraj Upadhyay <neeraju@codeaurora.org> Cc: Boqun Feng <boqun.feng@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.