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The rcutorture test suite sometimess triggers a random scheduler preemption call while simulating a read delay. Unfortunately, its direct call to preempt_schedule() bypasses the static call/key filter used by CONFIG_PREEMPT_DYNAMIC. This breaks the no-preempt assumption when the dynamic preemption mode is "none". For example, rcu_blocking_is_gp() is fooled and abbreviates grace periods when the CPU runs in no-preempt UP mode. Fix this by making torture_preempt_schedule() call __preempt_schedule(), which uses the static call/key. Reported-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Frederic Weisbecker <frederic@kernel.org> 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.