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For RCU implementations supporting multiple types of reader protection, rcutorture currently randomly selects the combinations of types of protection for each phase of each reader. The problem with this, for example, given the four kinds of protection for RCU-sched (local_irq_disable(), local_bh_disable(), preempt_disable(), and rcu_read_lock_sched()), the reader will be protected by a single mechanism only 25% of the time. We really heavier testing of single read-side mechanisms. This commit therefore uses only a single mechanism about 60% of the time, half of the time explicitly and one-eighth of the time by chance. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.