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The run-time single-CPU grace-period optimization applies only to kernels built with CONFIG_SMP=y && CONFIG_PREEMPTION=y that are running on a single-CPU system. But a kernel intended for a single-CPU system should instead be built with CONFIG_SMP=n, and in any case, single-CPU systems running Linux no longer appear to be the common case. Plus this optimization results in the rcu_gp_oldstate structure being half again larger than it needs to be. This commit therefore disables the run-time single-CPU grace-period optimization, so that this optimization applies only during the pre-scheduler portion of the boot sequence. 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.