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A recent discussion[1] shows that we are in favor of strengthening the ordering of unlock + lock on the same CPU: a unlock and a po-after lock should provide the so-called RCtso ordering, that is a memory access S po-before the unlock should be ordered against a memory access R po-after the lock, unless S is a store and R is a load. The strengthening meets programmers' expection that "sequence of two locked regions to be ordered wrt each other" (from Linus), and can reduce the mental burden when using locks. Therefore add it in LKMM. [1]: https://lore.kernel.org/lkml/20210909185937.GA12379@rowland.harvard.edu/ Co-developed-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Boqun Feng <boqun.feng@gmail.com> Reviewed-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc) Acked-by: Palmer Dabbelt <palmerdabbelt@google.com> (RISC-V) Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> 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.