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203185f6b1
The term "data dependency barrier", which has been in memory-barriers.txt ever since it was first authored by David Howells, has become confusing due to the fact that in LKMM's explanations.txt and elsewhere, "data dependency" is used mostly for load-to-store data dependency. To prevent further confusions, do the changes listed below: - substitute "data dependency barrier" with "address-dependency barrier"; - add note on the removal of kernel APIs for explicit address- dependency barriers in kernel release v5.9; - note that address-dependency barriers are not necessary for load-to-store situations; - use READ_ONCE_OLD() for pre-4.15 READ_ONCE() (no implicit address- dependency barrier); - fix count of kernel memory barrier APIs; - and a few more context adjustments. Note: Cleanups of long lines are deferred to a followup patch. Reported-by: "Michael S. Tsirkin" <mst@redhat.com> Link: https://lore.kernel.org/r/20211011064233-mutt-send-email-mst@kernel.org/ Signed-off-by: Akira Yokosawa <akiyks@gmail.com> Cc: "Paul E. McKenney" <paulmck@kernel.org> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: Will Deacon <will@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Boqun Feng <boqun.feng@gmail.com> Cc: Andrea Parri <parri.andrea@gmail.com> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: David Howells <dhowells@redhat.com> Cc: Daniel Lustig <dlustig@nvidia.com> Cc: Joel Fernandes <joel@joelfernandes.org> Cc: Jonathan Corbet <corbet@lwn.net> Signed-off-by: Paul E. McKenney <paulmck@kernel.org> |
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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. 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.