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This commit adds expedited grace-period functionality to RCU's polled grace-period API, adding start_poll_synchronize_rcu_expedited() and cond_synchronize_rcu_expedited(), which are similar to the existing start_poll_synchronize_rcu() and cond_synchronize_rcu() functions, respectively. Note that although start_poll_synchronize_rcu_expedited() can be invoked very early, the resulting expedited grace periods are not guaranteed to start until after workqueues are fully initialized. On the other hand, both synchronize_rcu() and synchronize_rcu_expedited() can also be invoked very early, and the resulting grace periods will be taken into account as they occur. [ paulmck: Apply feedback from Neeraj Upadhyay. ] Link: https://lore.kernel.org/all/20220121142454.1994916-1-bfoster@redhat.com/ Link: https://docs.google.com/document/d/1RNKWW9jQyfjxw2E8dsXVTdvZYh0HnYeSHDKog9jhdN8/edit?usp=sharing Cc: Brian Foster <bfoster@redhat.com> Cc: Dave Chinner <david@fromorbit.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Ian Kent <raven@themaw.net> 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.