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Because rcutree_migrate_callbacks() is invoked infrequently and because an exact snapshot of the grace-period state might save some callbacks a second trip through a grace period, this function has used the root rcu_node structure. However, this safe-second-trip optimization happens only if rcutree_migrate_callbacks() races with grace-period initialization, so it is not worth the added mental load. This commit therefore makes rcutree_migrate_callbacks() start with the leaf rcu_node structures, as is done elsewhere. Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
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.