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The current rcu_scale_writer() asynchronous grace-period testing uses a per-CPU counter to track the number of outstanding callbacks. This is subject to CPU-imbalance errors when tasks migrate from one CPU to another between the time that the counter is incremented and the callback is queued, and additionally in kernels configured such that callbacks can be invoked on some CPU other than the one that queued it. This commit therefore arranges for per-task callback counts, thus avoiding any issues with migration of either tasks or callbacks. Reported-by: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: "Paul E. McKenney" <paulmck@kernel.org> Signed-off-by: Neeraj Upadhyay <neeraj.upadhyay@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 reStructuredText 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.