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314eeb43e5
There are lockless loads from the rcu_node structure's ->exp_tasks field, so this commit causes all stores to use WRITE_ONCE() and all lockless loads to use READ_ONCE() or data_race(), with the latter for debug prints. This code also did a unprotected traversal of the linked list pointed into by ->exp_tasks, so this commit also acquires the rcu_node structure's ->lock to properly protect this traversal. This list was traversed unprotected only when printing an RCU CPU stall warning for an expedited grace period, so the odds of seeing this in production are not all that high. This data race was reported by KCSAN. 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.