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88db792bbe
The waitqueue used by rcu_tasks_kthread() has always only one waiter. With a guaranteed only one waiter, this can be replaced with rcuwait which is smaller and simpler. With rcuwait based wake counterpart, the irqwork function (call_rcu_tasks_iw_wakeup()) can be invoked hardirq context because it is only a wake up and no sleeping locks are involved (unlike the wait_queue_head). As a side effect, this is also one piece of the puzzle to pass the RCU selftest at early boot on PREEMPT_RT. Replace wait_queue_head with rcuwait and let the irqwork run in hardirq context on PREEMPT_RT. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Paul E. McKenney <paulmck@kernel.org> |
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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.