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, 418 insertions, 0 deletions

diff --git a/Documentation/sphinx/maintainers_include.py b/Documentation/sphinx/maintainers_include.py
new file mode 100755
index 000000000..7ffe19b5e
--- /dev/null
+++ b/Documentation/sphinx/maintainers_include.py
@@ -0,0 +1,418 @@
+#!/usr/bin/env python
+# SPDX-License-Identifier: GPL-2.0
+# -*- coding: utf-8; mode: python -*-
+# pylint: disable=C0209, C0301, E0401, R0022, R0902, R0903, R0912, R0914
+
+"""
+Implementation of the ``maintainers-include`` reST-directive.
+
+:copyright:  Copyright (C) 2019  Kees Cook <keescook@chromium.org>
+:license:    GPL Version 2, June 1991 see linux/COPYING for details.
+
+The ``maintainers-include`` reST-directive performs extensive parsing
+specific to the Linux kernel's standard "MAINTAINERS" file, in an
+effort to avoid needing to heavily mark up the original plain text.
+"""
+
+import os.path
+import re
+
+from glob import glob
+
+from docutils import statemachine
+from docutils.parsers.rst.directives.misc import Include
+
+#
+# Base URL for intersphinx-like links to maintainer profiles
+#
+KERNELDOC_URL = "https://docs.kernel.org/"
+
+__version__ = "1.0"
+
+maint_parser = None  # pylint: disable=C0103
+
+JS_FILTER = """
+(function() {
+  function filterTable(table) {
+    const filter = document.getElementById("filter-table").value.trim();
+    const rows = table.querySelectorAll("tbody tr");
+    for (let i = 0; i < rows.length; i++) {
+      const tds = rows[i].getElementsByTagName("td");
+      let match = false;
+      for (let j = 0; j < tds.length; j++) {
+        const cellText = (tds[j].textContent || tds[j].innerText);
+        if (cellText.includes(filter)) {
+          match = true;
+          break;
+        }
+      }
+      rows[i].style.display = match ? "table-row" : "none";
+    }
+  }
+  function addInput() {
+    const table = document.getElementById("maintainers-table");
+    if (!table) return;
+    let input = document.getElementById("filter-table");
+    if (!input) {
+      const filt_div = document.createElement('div');
+      filt_div.innerHTML = `
+        <p>Filter:
+          <input type="search" id="filter-table" placeholder="search string"/>
+          subsystem or property (case-sensitive)
+        </p>
+      `;
+      table.parentNode.insertBefore(filt_div, table);
+      const input = document.getElementById("filter-table")
+      input.addEventListener('input', () => filterTable(table));
+    }
+  }
+  if (document.readyState === 'loading') {
+    document.addEventListener('DOMContentLoaded', addInput);
+  } else {
+    addInput();
+  }
+})();
+"""
+
+
+# Shamelessly stolen from docutils
+def ErrorString(exc):  # pylint: disable=C0103, C0116
+    return f"{exc.__class__.__name}: {exc}"  # pylint: disable=W0212
+
+class MaintainersParser:
+    """Parse MAINTAINERS file(s) content"""
+
+    def __init__(self, base_dir, app_dir, path):
+        self.path = path
+
+        # Poor man's state machine.
+        self.descriptions = False
+        self.maintainers = False
+        self.subsystems = False
+
+        self.subsystem_name = None
+
+        self.base_dir = base_dir
+        self.app_dir = app_dir
+
+        self.re_doc = re.compile(r'(Documentation/(\S*)\.rst)')
+
+        #
+        # Output variables with maintainers content to be stored
+        #
+        self.profile_toc = set()
+        self.profile_entries = {}
+        self.header = ""
+        self.maint_entries = {}
+        self.fields = {}
+
+        prev = None
+        with open(path, "r", encoding="utf-8") as fp:
+            for line in fp:
+                if self.descriptions:
+                    self.parse_descriptions(line)
+                elif self.maintainers and not self.subsystems:
+                    if re.search('^[A-Z0-9]', line):
+                        self.subsystems = True
+                        self.parse_subsystems(line)
+                    else:
+                        self.header += line
+                elif self.subsystems:
+                    self.parse_subsystems(line)
+                else:
+                    self.header += line
+
+                # Update the state machine when we find heading separators.
+                if line.startswith("----------"):
+                    if prev.startswith("Descriptions"):
+                        self.descriptions = True
+                    if prev.startswith("Maintainers"):
+                        self.maintainers = True
+
+                # Retain previous line for state machine transitions.
+                prev = line
+
+    def get_entries(self, text):
+        """Generate refs to ReST files in Documentation/"""
+
+        if "Documentation/" not in text:
+            return None
+
+        if "*" in text or "?" in text:
+            m = self.re_doc.search(text)
+            if not m:
+                return None
+
+            doc_list = glob(os.path.join(self.base_dir, m.group(1)))
+        else:
+            doc_list = [text]
+
+        entries = {}
+        for doc in doc_list:
+            m = self.re_doc.search(doc)
+            if m:
+                fname = m.group(1)
+                ename = m.group(2)
+
+                entry = os.path.relpath(self.base_dir + fname, self.app_dir)
+                entry = entry.removesuffix(".rst")
+
+                if entry.startswith("../"):
+                    html = KERNELDOC_URL + ename + ".html"
+                    entries[entry] = f'`{ename} <{html}>`_'
+                else:
+                    entries[entry] = f'/{entry}'
+
+        return entries
+
+    def linkify(self, text):
+        """Return a list of doc files converted to cross-references"""
+
+        entries = self.get_entries(text)
+        if not entries:
+            return text
+
+        return self.re_doc.sub(", ".join(entries.values()), text)
+
+    def parse_descriptions(self, line):
+        """Handle contents of the descriptions section."""
+
+        # Have we reached the end of the preformatted Descriptions text?
+        if line.startswith("Maintainers"):
+            self.descriptions = False
+            self.header += "\n" + line
+            return
+
+        # Look for and record field letter to field name mappings:
+        #   R: Designated *reviewer*: FullName <address@domain>
+        m = re.match(r"\s+(\S):\s+(\S+)", line)
+        if m:
+            field = m.group(1)
+            details = m.group(2)
+
+            if field not in self.fields:
+                m = re.search(r"\*([^\*]+)\*", line)
+                if m:
+                    self.fields[field] = m.group(1)
+            elif field in ['F', 'N', 'X', 'K']:
+                line = line.replace(details, f'``{details}``')
+
+        self.header += "| " + self.linkify(line)
+
+
+    def parse_subsystems(self, line):
+        """Handle contents of the per-subsystem sections."""
+
+        # Drop needless input whitespace.
+        line = line.rstrip()
+
+        # Skip empty lines: subsystem parser adds them as needed.
+        if not line:
+            return
+
+        if line[1] != ':':
+            self.subsystem_name = re.sub(r"\s+", " ", self.linkify(line))
+            return
+
+        # Render a subsystem field as:
+        #   :Field: entry
+        #           entry...
+        field, details = line.split(":", 1)
+        details = details.strip()
+
+        #
+        # Handle profile entries - either as files or as https refs
+        #
+        if field == "P":
+            entries = self.get_entries(details)
+            if entries:
+                for e, link in entries.items():
+                    if "html" not in link:
+                        self.profile_toc.add(e)
+
+                    self.profile_entries[self.subsystem_name] = link
+
+                details = ", ".join(entries.values())
+            else:
+                match = re.match(r"(https?://.*)", details)
+                if match:
+                    entry = match.group(1).strip()
+                    self.profile_entries[self.subsystem_name] = entry
+                else:
+                    self.profile_entries[self.subsystem_name] = f"``{details}``"
+
+                details = self.linkify(details)
+        else:
+            details = self.linkify(details)
+
+        #
+        # Mark paths (and regexes) as literal text for improved
+        # readability and to escape any escapes.
+        #
+        if field in ['F', 'N', 'X', 'K']:
+            # But only if not already marked :)
+            if ':doc:' not in details and "http" not in details:
+                details = '``%s``' % (details)
+
+        if self.subsystem_name not in self.maint_entries:
+            self.maint_entries[self.subsystem_name] = {}
+
+        if field not in self.maint_entries[self.subsystem_name]:
+            self.maint_entries[self.subsystem_name][field] = []
+
+        self.maint_entries[self.subsystem_name][field].append(details)
+
+        self.field_prev = field
+
+
+class MaintainersInclude(Include):
+    """MaintainersInclude (``maintainers-include``) directive"""
+
+    required_arguments = 0
+
+    def emit(self):
+        """Parse all the MAINTAINERS lines into ReST for human-readability"""
+        path = maint_parser.path
+        output = ".. _maintainers:\n\n"
+        output += maint_parser.header
+
+        output += ".. _maintainers_table:\n\n"
+        output += ".. flat-table::\n"
+        output += "  :header-rows: 1\n\n"
+        output += "  * - Subsystem\n"
+        output += "    - Properties\n\n"
+
+        self.state.document['maintainers_included'] = True
+
+        # Keep the last entry ("THE REST") in the end
+        entries = list(maint_parser.maint_entries.keys())
+        entries = sorted(entries[:-1], key=str.casefold) + [entries[-1]]
+
+        for name in entries:
+            fields = maint_parser.maint_entries[name]
+            output += f"  * - {name}\n"
+            tag = "-"
+            for field, lines in fields.items():
+                field_name = maint_parser.fields.get(field, field)
+
+                output += f"    {tag} :{field_name}:\n        "
+                output += ",\n        ".join(lines) + "\n"
+                tag = " "
+
+            output += "\n"
+
+        # For debugging the pre-rendered results...
+        #print(output, file=open("/tmp/MAINTAINERS.rst", "w"))
+
+        self.state.document.settings.record_dependencies.add(path)
+        self.state_machine.insert_input(statemachine.string2lines(output), path)
+
+    def run(self):
+        """Include the MAINTAINERS file as part of this reST file."""
+        if not self.state.document.settings.file_insertion_enabled:
+            raise self.warning('"%s" directive disabled.' % self.name)
+
+        try:
+            self.emit()
+        except IOError as error:
+            raise self.severe('Problems with "%s" directive path:\n%s.' %
+                      (self.name, ErrorString(error)))
+
+        return []
+
+
+class MaintainersProfile(Include):
+    """Generate a list with all maintainer's profiles"""
+
+    required_arguments = 0
+
+    def emit(self):
+        """Parse all the MAINTAINERS lines looking for profile entries"""
+        env = self.state.document.settings.env
+        docdir = os.path.dirname(os.path.join(env.srcdir, env.docname))
+        path = maint_parser.path
+
+        #
+        # Produce a list with all maintainer profiles, sorted by subsystem name
+        #
+        output = ""
+        for profile, entry in sorted(maint_parser.profile_entries.items()):
+            name = profile.title()
+
+            if entry.startswith("http"):
+                output += f"- `{name} <{entry}>`_\n"
+            elif entry.startswith("`"):
+                output += f"- {name}: {entry}\n"
+                self.warning(f"{profile}: Invalid 'P' tag: {entry}\n")
+            else:
+                if not name:
+                    name = entry
+
+                output += f"- :doc:`{name} <{entry}>`\n"
+
+        #
+        # Create a hidden TOC table with all profiles. That allows adding
+        # profiles without needing to add them on any index.rst file.
+        #
+        output += "\n.. toctree::\n"
+        output += "   :hidden:\n\n"
+
+        for f in sorted(maint_parser.profile_toc):
+            fname = os.path.join(maint_parser.base_dir, "Documentation", f)
+            fname = os.path.relpath(fname, docdir)
+            output += f"   {fname}\n"
+
+        output += "\n"
+
+        # For debugging the pre-rendered results...
+        #print(output, file=open("/tmp/profiles.rst", "w"))
+
+        self.state.document.settings.record_dependencies.add(path)
+        self.state_machine.insert_input(statemachine.string2lines(output), path)
+
+    def run(self):
+        """Include the MAINTAINERS file as part of this reST file."""
+        if not self.state.document.settings.file_insertion_enabled:
+            raise self.warning('"%s" directive disabled.' % self.name)
+
+        try:
+            self.emit()
+        except IOError as error:
+            raise self.severe('Problems with "%s" directive path:\n%s.' %
+                      (self.name, ErrorString(error)))
+
+        return []
+
+
+# pylint: disable=W0613
+def add_filter_script(app, pagename, templatename, context, doctree):
+    """Add Filter javascript only to maintainers page"""
+
+    if doctree and doctree.get('maintainers_included'):
+        app.add_js_file(None, body=JS_FILTER)
+
+
+def setup(app):
+    """Setup Sphinx extension"""
+    global maint_parser  # pylint: disable=W0603
+
+    app_dir = os.path.abspath(app.srcdir)
+    match = re.match(r"(.*/)Documentation", app_dir)
+    if not match:
+        raise ValueError('Documentation directory not found.')
+
+    base_dir = match.group(1)
+    path = os.path.join(base_dir, "MAINTAINERS")
+
+    maint_parser = MaintainersParser(base_dir, app_dir, path)
+
+    app.add_directive("maintainers-include", MaintainersInclude)
+    app.add_directive("maintainers-profile-toc", MaintainersProfile)
+
+    app.connect("html-page-context", add_filter_script)
+
+    return {
+        "version": __version__,
+        "parallel_read_safe": True,
+        "parallel_write_safe": True,
+    }