7e937220af
Because preemptible RCU's __rcu_read_unlock() is an external function, the rough equivalent of an implicit barrier() is inserted by the compiler. Except that there is a direct call to __rcu_read_unlock() in that same file, and compilers are getting to the point where they might choose to inline the fastpath of the __rcu_read_unlock() function. This commit therefore adds an explicit barrier() to the very beginning of __rcu_read_unlock(). 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.