Paul E. McKenney
91a967fd69
The get_completed_synchronize_rcu() and poll_state_synchronize_rcu() APIs compress the combined expedited and normal grace-period states into a single unsigned long, which conserves storage, but can miss grace periods in certain cases involving overlapping normal and expedited grace periods. Missing the occasional grace period is usually not a problem, but there are use cases that care about each and every grace period. This commit therefore adds the first members of the full-state RCU grace-period polling API, namely the get_completed_synchronize_rcu_full() and poll_state_synchronize_rcu_full() functions. These use up to three times the storage (rcu_gp_oldstate structure instead of unsigned long), but which are guaranteed not to miss grace periods, at least in situations where the single-CPU grace-period optimization does not apply. 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.