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When under overload conditions, __call_rcu_nocb_wake() will wake the no-CBs GP kthread any time the no-CBs CB kthread is asleep or there are no ready-to-invoke callbacks, but only after a timer delay. If the no-CBs GP kthread has a ->nocb_bypass_timer pending, the deferred wakeup from __call_rcu_nocb_wake() is redundant. This commit therefore makes __call_rcu_nocb_wake() avoid posting the redundant deferred wakeup if ->nocb_bypass_timer is pending. This requires adding a bit of ordering of timer actions. Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
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.