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b96a8b0b5b
The ->lazy_len is only checked locklessly. Recheck again under the ->nocb_lock to avoid spending more time on flushing/waking if not necessary. The ->lazy_len can still increment concurrently (from 1 to infinity) but under the ->nocb_lock we at least know for sure if there are lazy callbacks at all (->lazy_len > 0). 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.