5e59fba573
Currently, rcutorture refuses to test RCU priority boosting in CONFIG_HOTPLUG_CPU=y kernels, which are the only kind normally built on x86 these days. This commit therefore updates rcutorture's tests of RCU priority boosting to make them safe for CPU hotplug. However, these tests will fail unless TIMER_SOFTIRQ runs at realtime priority, which does not happen in current mainline. This commit therefore also refuses to test RCU priority boosting except in kernels built with CONFIG_PREEMPT_RT=y. While in the area, this commt adds some debug output at boost-fail time that helps diagnose the cause of the failure, for example, failing to run TIMER_SOFTIRQ at realtime priority. Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: Scott Wood <swood@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> 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.