Merge tag 'io_uring-7.3-20261002' of git://git.kernel.org/pub/scm/linux/kernel/git/axboe/linuxgrafted

Pull io_uring fixes from Jens Axboe:

 - Fix a task_work add use-after-free with SQPOLL.

   The sqpoll thread could pop and complete the last request while
   io_req_normal_work_add() was still looking at them after the mpscq
   push.

   Use the same approach as DEFER_TASKRUN to protect from that, holding
   an RCU read lock across the add, and have exit wait for an RCU grace
   period for SQPOLL rings as well.

 - CQE32 ring fixes: correct the free entry check for 32b CQEs, zero the
   big_cqe for aux CQEs, and only post the dummy skip CQE on CQE_MIXED
   rings

 - Mark the source filter table as COW when cloning bpf filters, so
   registering another filter on the source doesn't modify the shared
   table in place

 - Initialize the task context before running the BPF loop

 - Requeue zcrx multishot receives stopped by a local resource

 - End a TX_TIMESTAMP multishot cmd when the CQ is full (lollipopkit)

* tag 'io_uring-7.3-20261002' of git://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux:
  io_uring: fix task_work add use-after-free with SQPOLL
  io_uring/cmd_net: end TX_TIMESTAMP multishot when the CQ is full
  io_uring/zcrx: requeue multishot receives stopped by a local resource
  io_uring: initialize task context before running the BPF loop
  io_uring: zero big_cqe for aux CQEs on CQE32 rings
  io_uring: fix free entry check for 32b CQEs on CQE32 rings
  io_uring: only post the dummy skip CQE on CQE_MIXED rings
  io_uring/bpf_filter: mark source as COW when cloning filters

1 files changed, 381 insertions, 0 deletions

diff --git a/Documentation/process/kernel-docs.rst b/Documentation/process/kernel-docs.rst
new file mode 100644
index 000000000..c67ac12cf
--- /dev/null
+++ b/Documentation/process/kernel-docs.rst
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+.. _kernel_docs:
+
+Index of Further Kernel Documentation
+=====================================
+
+The need for a document like this one became apparent in the linux-kernel
+mailing list as the same questions, asking for pointers to information,
+appeared again and again.
+
+Fortunately, as more and more people get to GNU/Linux, more and more get
+interested in the Kernel. But reading the sources is not always enough. It
+is easy to understand the code, but miss the concepts, the philosophy and
+design decisions behind this code.
+
+Unfortunately, not many documents are available for beginners to start.
+And, even if they exist, there was no "well-known" place which kept track
+of them. These lines try to cover this lack.
+
+PLEASE, if you know any paper not listed here or write a new document,
+include a reference to it here, following the kernel's patch submission
+process. Any corrections, ideas or comments are also welcome.
+
+All documents are cataloged with the following fields: the document's
+"Title", the "Author"/s, the "URL" where they can be found, some "Keywords"
+helpful when searching for specific topics, and a brief "Description" of
+the Document.
+
+.. note::
+
+   The documents on each section of this document are ordered by its
+   published date, from the newest to the oldest. The maintainer(s) should
+   periodically retire resources as they become obsolete or outdated; with
+   the exception of foundational books.
+
+Docs at the Linux Kernel tree
+-----------------------------
+
+The Sphinx books should be built with ``make {htmldocs | pdfdocs | epubdocs}``.
+
+    * Name: **linux/Documentation**
+
+      :Author: Many.
+      :Location: Documentation/
+      :Keywords: text files, Sphinx.
+      :Description: Documentation that comes with the kernel sources,
+        inside the Documentation directory. Some pages from this document
+        (including this document itself) have been moved there, and might
+        be more up to date than the web version.
+
+On-line docs
+------------
+
+    * Title: **Linux Kernel Mailing List Glossary**
+
+      :Author: various
+      :URL: https://kernelnewbies.org/KernelGlossary
+      :Date: rolling version
+      :Keywords: glossary, terms, linux-kernel.
+      :Description: From the introduction: "This glossary is intended as
+        a brief description of some of the acronyms and terms you may hear
+        during discussion of the Linux kernel".
+
+    * Title: **The Linux Kernel Module Programming Guide**
+
+      :Author: Peter Jay Salzman, Michael Burian, Ori Pomerantz, Bob Mottram,
+        Jim Huang.
+      :URL: https://sysprog21.github.io/lkmpg/
+      :Date: 2021
+      :Keywords: modules, GPL book, /proc, ioctls, system calls,
+        interrupt handlers .
+      :Description: A very nice GPL book on the topic of modules
+        programming. Lots of examples. Currently the new version is being
+        actively maintained at https://github.com/sysprog21/lkmpg.
+
+Published books
+---------------
+
+    * Title: **The Linux Memory Manager**
+
+      :Author: Lorenzo Stoakes
+      :Publisher: No Starch Press
+      :Date: February 2025
+      :Pages: 1300
+      :ISBN: 978-1718504462
+      :Notes: Memory management. Full draft available as early access for
+              pre-order, full release scheduled for Fall 2025. See
+              https://nostarch.com/linux-memory-manager for further info.
+
+    * Title: **Practical Linux System Administration: A Guide to Installation, Configuration, and Management, 1st Edition**
+
+      :Author: Kenneth Hess
+      :Publisher: O'Reilly Media
+      :Date: May, 2023
+      :Pages: 246
+      :ISBN: 978-1098109035
+      :Notes: System administration
+
+    * Title: **Linux Kernel Debugging: Leverage proven tools and advanced techniques to effectively debug Linux kernels and kernel modules**
+
+      :Author: Kaiwan N Billimoria
+      :Publisher: Packt Publishing Ltd
+      :Date: August, 2022
+      :Pages: 638
+      :ISBN: 978-1801075039
+      :Notes: Debugging book
+
+    * Title: **Linux Kernel Programming: A Comprehensive Guide to Kernel Internals, Writing Kernel Modules, and Kernel Synchronization**
+
+      :Author: Kaiwan N Billimoria
+      :Publisher: Packt Publishing Ltd
+      :Date: March, 2021 (Second Edition published in 2024)
+      :Pages: 754
+      :ISBN: 978-1789953435 (Second Edition ISBN is 978-1803232225)
+
+    * Title: **Linux Kernel Programming Part 2 - Char Device Drivers and Kernel Synchronization: Create user-kernel interfaces, work with peripheral I/O, and handle hardware interrupts**
+
+      :Author: Kaiwan N Billimoria
+      :Publisher: Packt Publishing Ltd
+      :Date: March, 2021
+      :Pages: 452
+      :ISBN: 978-1801079518
+
+    * Title: **Linux System Programming: Talking Directly to the Kernel and C Library**
+
+      :Author: Robert Love
+      :Publisher: O'Reilly Media
+      :Date: June, 2013
+      :Pages: 456
+      :ISBN: 978-1449339531
+      :Notes: Foundational book
+
+    * Title: **Linux Kernel Development, 3rd Edition**
+
+      :Author: Robert Love
+      :Publisher: Addison-Wesley
+      :Date: July, 2010
+      :Pages: 440
+      :ISBN: 978-0672329463
+      :Notes: Foundational book
+
+.. _ldd3_published:
+
+    * Title: **Linux Device Drivers, 3rd Edition**
+
+      :Authors: Jonathan Corbet, Alessandro Rubini, and Greg Kroah-Hartman
+      :Publisher: O'Reilly & Associates
+      :Date: 2005
+      :Pages: 636
+      :ISBN: 0-596-00590-3
+      :Notes: Foundational book. Further information in
+        http://www.oreilly.com/catalog/linuxdrive3/
+        PDF format, URL: https://lwn.net/Kernel/LDD3/
+
+    * Title: **The Design of the UNIX Operating System**
+
+      :Author: Maurice J. Bach
+      :Publisher: Prentice Hall
+      :Date: 1986
+      :Pages: 471
+      :ISBN: 0-13-201757-1
+      :Notes: Foundational book
+
+Miscellaneous
+-------------
+
+    * Name: **Cross-Referencing Linux**
+
+      :URL: https://elixir.bootlin.com/
+      :Keywords: Browsing source code.
+      :Description: Another web-based Linux kernel source code browser.
+        Lots of cross references to variables and functions. You can see
+        where they are defined and where they are used.
+
+    * Name: **Linux Weekly News**
+
+      :URL: https://lwn.net
+      :Keywords: latest kernel news.
+      :Description: The title says it all. There's a fixed kernel section
+        summarizing developers' work, bug fixes, new features and versions
+        produced during the week.
+
+    * Name: **The home page of Linux-MM**
+
+      :Author: The Linux-MM team.
+      :URL: https://linux-mm.org/
+      :Keywords: memory management, Linux-MM, mm patches, TODO, docs,
+        mailing list.
+      :Description: Site devoted to Linux Memory Management development.
+        Memory related patches, HOWTOs, links, mm developers... Don't miss
+        it if you are interested in memory management development!
+
+    * Name: **Kernel Newbies IRC Channel and Website**
+
+      :URL: https://www.kernelnewbies.org
+      :Keywords: IRC, newbies, channel, asking doubts.
+      :Description: #kernelnewbies on irc.oftc.net.
+        #kernelnewbies is an IRC network dedicated to the 'newbie'
+        kernel hacker. The audience mostly consists of people who are
+        learning about the kernel, working on kernel projects or
+        professional kernel hackers that want to help less seasoned kernel
+        people.
+        #kernelnewbies is on the OFTC IRC Network.
+        Try irc.oftc.net as your server and then /join #kernelnewbies.
+        The kernelnewbies website also hosts articles, documents, FAQs...
+
+    * Name: **linux-kernel mailing list archives and search engines**
+
+      :URL: https://subspace.kernel.org
+      :URL: https://lore.kernel.org
+      :Keywords: linux-kernel, archives, search.
+      :Description: Some of the linux-kernel mailing list archivers. If
+        you have a better/another one, please let me know.
+
+    * Name: **The Linux Foundation YouTube channel**
+
+      :URL: https://www.youtube.com/user/thelinuxfoundation
+      :Keywords: linux, videos, linux-foundation, youtube.
+      :Description: The Linux Foundation uploads video recordings of their
+        collaborative events, Linux conferences including LinuxCon, and
+        other original research and content related to Linux and software
+        development.
+
+Rust
+----
+
+    * Title: **Rust for Linux**
+
+      :Author: various
+      :URL: https://rust-for-linux.com/
+      :Date: rolling version
+      :Keywords: glossary, terms, linux-kernel, rust.
+      :Description: From the website: "Rust for Linux is the project adding
+        support for the Rust language to the Linux kernel. This website is
+        intended as a hub of links, documentation and resources related to
+        the project".
+
+    * Title: **Learn Rust the Dangerous Way**
+
+      :Author: Cliff L. Biffle
+      :URL: https://cliffle.com/p/dangerust/
+      :Date: Accessed Sep 11 2024
+      :Keywords: rust, blog.
+      :Description: From the website: "LRtDW is a series of articles
+        putting Rust features in context for low-level C programmers who
+        maybe don’t have a formal CS background — the sort of people who
+        work on firmware, game engines, OS kernels, and the like.
+        Basically, people like me.". It illustrates line-by-line
+        conversions from C to Rust.
+
+    * Title: **The Rust Book**
+
+      :Author: Steve Klabnik and Carol Nichols, with contributions from the
+        Rust community
+      :URL: https://doc.rust-lang.org/book/
+      :Date: Accessed Sep 11 2024
+      :Keywords: rust, book.
+      :Description: From the website: "This book fully embraces the
+        potential of Rust to empower its users. It’s a friendly and
+        approachable text intended to help you level up not just your
+        knowledge of Rust, but also your reach and confidence as a
+        programmer in general. So dive in, get ready to learn—and welcome
+        to the Rust community!".
+
+    * Title: **Rust for the Polyglot Programmer**
+
+      :Author: Ian Jackson
+      :URL: https://www.chiark.greenend.org.uk/~ianmdlvl/rust-polyglot/index.html
+      :Date: December 2022
+      :Keywords: rust, blog, tooling.
+      :Description: From the website: "There are many guides and
+        introductions to Rust. This one is something different: it is
+        intended for the experienced programmer who already knows many
+        other programming languages. I try to be comprehensive enough to be
+        a starting point for any area of Rust, but to avoid going into too
+        much detail except where things are not as you might expect. Also
+        this guide is not entirely free of opinion, including
+        recommendations of libraries (crates), tooling, etc.".
+
+    * Title: **Fasterthanli.me**
+
+      :Author: Amos Wenger
+      :URL: https://fasterthanli.me/
+      :Date: Accessed Sep 11 2024
+      :Keywords: rust, blog, news.
+      :Description: From the website: "I make articles and videos about how
+        computers work. My content is long-form, didactic and exploratory
+        — and often an excuse to teach Rust!".
+
+    * Title: **Comprehensive Rust**
+
+      :Author: Android team at Google
+      :URL: https://google.github.io/comprehensive-rust/
+      :Date: Accessed Sep 13 2024
+      :Keywords: rust, blog.
+      :Description: From the website: "The course covers the full spectrum
+        of Rust, from basic syntax to advanced topics like generics and
+        error handling".
+
+    * Title: **The Embedded Rust Book**
+
+      :Author: Multiple contributors, mostly Jorge Aparicio
+      :URL: https://docs.rust-embedded.org/book/
+      :Date: Accessed Sep 13 2024
+      :Keywords: rust, blog.
+      :Description: From the website: "An introductory book about using
+        the Rust Programming Language on "Bare Metal" embedded systems,
+        such as Microcontrollers".
+
+   * Title: **Experiment: Improving the Rust Book**
+
+      :Author: Cognitive Engineering Lab at Brown University
+      :URL: https://rust-book.cs.brown.edu/
+      :Date: Accessed Sep 22 2024
+      :Keywords: rust, blog.
+      :Description: From the website: "The goal of this experiment is to
+        evaluate and improve the content of the Rust Book to help people
+        learn Rust more effectively.".
+
+   * Title: **New Rustacean** (podcast)
+
+      :Author: Chris Krycho
+      :URL: https://newrustacean.com/
+      :Date: Accessed Sep 22 2024
+      :Keywords: rust, podcast.
+      :Description: From the website: "This is a podcast about learning
+        the programming language Rust—from scratch! Apart from this spiffy
+        landing page, all the site content is built with Rust's own
+        documentation tools.".
+
+   * Title: **Opsem-team** (repository)
+
+      :Author: Operational semantics team
+      :URL: https://github.com/rust-lang/opsem-team/tree/main
+      :Date: Accessed Sep 22 2024
+      :Keywords: rust, repository.
+      :Description: From the README: "The opsem team is the successor of
+        the unsafe-code-guidelines working group and responsible for
+        answering many of the difficult questions about the semantics of
+        unsafe Rust".
+
+    * Title: **You Can't Spell Trust Without Rust**
+
+      :Author: Alexis Beingessner
+      :URL: https://repository.library.carleton.ca/downloads/1j92g820w?locale=en
+      :Date: 2015
+      :Keywords: rust, master, thesis.
+      :Description: This thesis focuses on Rust's ownership system, which
+        ensures memory safety by controlling data manipulation and
+        lifetime, while also highlighting its limitations and comparing it
+        to similar systems in Cyclone and C++.
+
+    * Name: **Linux Plumbers (LPC) 2024 Rust presentations**
+
+      :Title: Rust microconference
+      :URL: https://lpc.events/event/18/sessions/186/#20240918
+      :Title: Rust for Linux
+      :URL: https://lpc.events/event/18/contributions/1912/
+      :Title: Journey of a C kernel engineer starting a Rust driver project
+      :URL: https://lpc.events/event/18/contributions/1911/
+      :Title: Crafting a Linux kernel scheduler that runs in user-space
+        using Rust
+      :URL: https://lpc.events/event/18/contributions/1723/
+      :Title: openHCL: A Linux and Rust based paravisor
+      :URL: https://lpc.events/event/18/contributions/1956/
+      :Keywords: rust, lpc, presentations.
+      :Description: A number of LPC talks related to Rust.
+
+    * Name: **The Rustacean Station Podcast**
+
+      :URL: https://rustacean-station.org/
+      :Keywords: rust, podcasts.
+      :Description: A community project for creating podcast content for
+        the Rust programming language.
+
+-------
+
+This document was originally based on:
+
+ https://www.dit.upm.es/~jmseyas/linux/kernel/hackers-docs.html
+
+and written by Juan-Mariano de Goyeneche