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RCU priority boosting cannot do anything unless there is at least one task blocking the current RCU grace period that was preempted within the RCU read-side critical section that it still resides in. However, the current rcu_torture_boost_failed() code will count this as an RCU priority-boosting failure if there were no CPUs blocking the current grace period. This situation can happen (for example) if the last CPU blocking the current grace period was subjected to vCPU preemption, which is always a risk for rcutorture guest OSes. This commit therefore causes rcu_torture_boost_failed() to refrain from reporting failure unless there is at least one task blocking the current RCU grace period that was preempted within the RCU read-side critical section that it still resides in. 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.