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![]() The synchronize_rcu() definition based on RW-locks in whatisRCU.txt does not meet the "Memory-Barrier Guarantees" in Requirements.html; for example, the following SB-like test: P0: P1: WRITE_ONCE(x, 1); WRITE_ONCE(y, 1); synchronize_rcu(); smp_mb(); r0 = READ_ONCE(y); r1 = READ_ONCE(x); should not be allowed to reach the state "r0 = 0 AND r1 = 0", but the current write_lock()+write_unlock() definition can not ensure this. This commit therefore inserts an smp_mb__after_spinlock() in order to cause this synchronize_rcu() implementation to provide this memory-barrier guarantee. Suggested-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: Andrea Parri <andrea.parri@amarulasolutions.com> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Josh Triplett <josh@joshtriplett.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Lai Jiangshan <jiangshanlai@gmail.com> Cc: Jonathan Corbet <corbet@lwn.net> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> |
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README |
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. See Documentation/00-INDEX for a list of what is contained in each file. 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.