Revert "doc: update Kernel documentation build system"

Unfortunately we now see a number of now-fatal warnings about duplicate
labels.  It is often unclear how best to re-write the document in
question to not duplicate these otherwise logical headings.

This reverts commit 10a1df3cd43ba2fe893d5dd1aeb2e7109ef0007f.

Signed-off-by: Tom Rini <trini@konsulko.com>

12 files changed, 12 insertions, 1029 deletions

diff --git a/doc/sphinx/automarkup.py b/doc/sphinx/automarkup.py
deleted file mode 100644
index 953b24b6e2b..00000000000
--- a/doc/sphinx/automarkup.py
+++ /dev/null
@@ -1,290 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0
-# Copyright 2019 Jonathan Corbet <corbet@lwn.net>
-#
-# Apply kernel-specific tweaks after the initial document processing
-# has been done.
-#
-from docutils import nodes
-import sphinx
-from sphinx import addnodes
-if sphinx.version_info[0] < 2 or \
-   sphinx.version_info[0] == 2 and sphinx.version_info[1] < 1:
-    from sphinx.environment import NoUri
-else:
-    from sphinx.errors import NoUri
-import re
-from itertools import chain
-
-#
-# Python 2 lacks re.ASCII...
-#
-try:
-    ascii_p3 = re.ASCII
-except AttributeError:
-    ascii_p3 = 0
-
-#
-# Regex nastiness.  Of course.
-# Try to identify "function()" that's not already marked up some
-# other way.  Sphinx doesn't like a lot of stuff right after a
-# :c:func: block (i.e. ":c:func:`mmap()`s" flakes out), so the last
-# bit tries to restrict matches to things that won't create trouble.
-#
-RE_function = re.compile(r'\b(([a-zA-Z_]\w+)\(\))', flags=ascii_p3)
-
-#
-# Sphinx 2 uses the same :c:type role for struct, union, enum and typedef
-#
-RE_generic_type = re.compile(r'\b(struct|union|enum|typedef)\s+([a-zA-Z_]\w+)',
-                             flags=ascii_p3)
-
-#
-# Sphinx 3 uses a different C role for each one of struct, union, enum and
-# typedef
-#
-RE_struct = re.compile(r'\b(struct)\s+([a-zA-Z_]\w+)', flags=ascii_p3)
-RE_union = re.compile(r'\b(union)\s+([a-zA-Z_]\w+)', flags=ascii_p3)
-RE_enum = re.compile(r'\b(enum)\s+([a-zA-Z_]\w+)', flags=ascii_p3)
-RE_typedef = re.compile(r'\b(typedef)\s+([a-zA-Z_]\w+)', flags=ascii_p3)
-
-#
-# Detects a reference to a documentation page of the form Documentation/... with
-# an optional extension
-#
-RE_doc = re.compile(r'\bDocumentation(/[\w\-_/]+)(\.\w+)*')
-
-RE_namespace = re.compile(r'^\s*..\s*c:namespace::\s*(\S+)\s*$')
-
-#
-# Reserved C words that we should skip when cross-referencing
-#
-Skipnames = [ 'for', 'if', 'register', 'sizeof', 'struct', 'unsigned' ]
-
-
-#
-# Many places in the docs refer to common system calls.  It is
-# pointless to try to cross-reference them and, as has been known
-# to happen, somebody defining a function by these names can lead
-# to the creation of incorrect and confusing cross references.  So
-# just don't even try with these names.
-#
-Skipfuncs = [ 'open', 'close', 'read', 'write', 'fcntl', 'mmap',
-              'select', 'poll', 'fork', 'execve', 'clone', 'ioctl',
-              'socket' ]
-
-c_namespace = ''
-
-def markup_refs(docname, app, node):
-    t = node.astext()
-    done = 0
-    repl = [ ]
-    #
-    # Associate each regex with the function that will markup its matches
-    #
-    markup_func_sphinx2 = {RE_doc: markup_doc_ref,
-                           RE_function: markup_c_ref,
-                           RE_generic_type: markup_c_ref}
-
-    markup_func_sphinx3 = {RE_doc: markup_doc_ref,
-                           RE_function: markup_func_ref_sphinx3,
-                           RE_struct: markup_c_ref,
-                           RE_union: markup_c_ref,
-                           RE_enum: markup_c_ref,
-                           RE_typedef: markup_c_ref}
-
-    if sphinx.version_info[0] >= 3:
-        markup_func = markup_func_sphinx3
-    else:
-        markup_func = markup_func_sphinx2
-
-    match_iterators = [regex.finditer(t) for regex in markup_func]
-    #
-    # Sort all references by the starting position in text
-    #
-    sorted_matches = sorted(chain(*match_iterators), key=lambda m: m.start())
-    for m in sorted_matches:
-        #
-        # Include any text prior to match as a normal text node.
-        #
-        if m.start() > done:
-            repl.append(nodes.Text(t[done:m.start()]))
-
-        #
-        # Call the function associated with the regex that matched this text and
-        # append its return to the text
-        #
-        repl.append(markup_func[m.re](docname, app, m))
-
-        done = m.end()
-    if done < len(t):
-        repl.append(nodes.Text(t[done:]))
-    return repl
-
-#
-# In sphinx3 we can cross-reference to C macro and function, each one with its
-# own C role, but both match the same regex, so we try both.
-#
-def markup_func_ref_sphinx3(docname, app, match):
-    class_str = ['c-func', 'c-macro']
-    reftype_str = ['function', 'macro']
-
-    cdom = app.env.domains['c']
-    #
-    # Go through the dance of getting an xref out of the C domain
-    #
-    base_target = match.group(2)
-    target_text = nodes.Text(match.group(0))
-    xref = None
-    possible_targets = [base_target]
-    # Check if this document has a namespace, and if so, try
-    # cross-referencing inside it first.
-    if c_namespace:
-        possible_targets.insert(0, c_namespace + "." + base_target)
-
-    if base_target not in Skipnames:
-        for target in possible_targets:
-            if target not in Skipfuncs:
-                for class_s, reftype_s in zip(class_str, reftype_str):
-                    lit_text = nodes.literal(classes=['xref', 'c', class_s])
-                    lit_text += target_text
-                    pxref = addnodes.pending_xref('', refdomain = 'c',
-                                                  reftype = reftype_s,
-                                                  reftarget = target, modname = None,
-                                                  classname = None)
-                    #
-                    # XXX The Latex builder will throw NoUri exceptions here,
-                    # work around that by ignoring them.
-                    #
-                    try:
-                        xref = cdom.resolve_xref(app.env, docname, app.builder,
-                                                 reftype_s, target, pxref,
-                                                 lit_text)
-                    except NoUri:
-                        xref = None
-
-                    if xref:
-                        return xref
-
-    return target_text
-
-def markup_c_ref(docname, app, match):
-    class_str = {# Sphinx 2 only
-                 RE_function: 'c-func',
-                 RE_generic_type: 'c-type',
-                 # Sphinx 3+ only
-                 RE_struct: 'c-struct',
-                 RE_union: 'c-union',
-                 RE_enum: 'c-enum',
-                 RE_typedef: 'c-type',
-                 }
-    reftype_str = {# Sphinx 2 only
-                   RE_function: 'function',
-                   RE_generic_type: 'type',
-                   # Sphinx 3+ only
-                   RE_struct: 'struct',
-                   RE_union: 'union',
-                   RE_enum: 'enum',
-                   RE_typedef: 'type',
-                   }
-
-    cdom = app.env.domains['c']
-    #
-    # Go through the dance of getting an xref out of the C domain
-    #
-    base_target = match.group(2)
-    target_text = nodes.Text(match.group(0))
-    xref = None
-    possible_targets = [base_target]
-    # Check if this document has a namespace, and if so, try
-    # cross-referencing inside it first.
-    if c_namespace:
-        possible_targets.insert(0, c_namespace + "." + base_target)
-
-    if base_target not in Skipnames:
-        for target in possible_targets:
-            if not (match.re == RE_function and target in Skipfuncs):
-                lit_text = nodes.literal(classes=['xref', 'c', class_str[match.re]])
-                lit_text += target_text
-                pxref = addnodes.pending_xref('', refdomain = 'c',
-                                              reftype = reftype_str[match.re],
-                                              reftarget = target, modname = None,
-                                              classname = None)
-                #
-                # XXX The Latex builder will throw NoUri exceptions here,
-                # work around that by ignoring them.
-                #
-                try:
-                    xref = cdom.resolve_xref(app.env, docname, app.builder,
-                                             reftype_str[match.re], target, pxref,
-                                             lit_text)
-                except NoUri:
-                    xref = None
-
-                if xref:
-                    return xref
-
-    return target_text
-
-#
-# Try to replace a documentation reference of the form Documentation/... with a
-# cross reference to that page
-#
-def markup_doc_ref(docname, app, match):
-    stddom = app.env.domains['std']
-    #
-    # Go through the dance of getting an xref out of the std domain
-    #
-    target = match.group(1)
-    xref = None
-    pxref = addnodes.pending_xref('', refdomain = 'std', reftype = 'doc',
-                                  reftarget = target, modname = None,
-                                  classname = None, refexplicit = False)
-    #
-    # XXX The Latex builder will throw NoUri exceptions here,
-    # work around that by ignoring them.
-    #
-    try:
-        xref = stddom.resolve_xref(app.env, docname, app.builder, 'doc',
-                                   target, pxref, None)
-    except NoUri:
-        xref = None
-    #
-    # Return the xref if we got it; otherwise just return the plain text.
-    #
-    if xref:
-        return xref
-    else:
-        return nodes.Text(match.group(0))
-
-def get_c_namespace(app, docname):
-    source = app.env.doc2path(docname)
-    with open(source) as f:
-        for l in f:
-            match = RE_namespace.search(l)
-            if match:
-                return match.group(1)
-    return ''
-
-def auto_markup(app, doctree, name):
-    global c_namespace
-    c_namespace = get_c_namespace(app, name)
-    #
-    # This loop could eventually be improved on.  Someday maybe we
-    # want a proper tree traversal with a lot of awareness of which
-    # kinds of nodes to prune.  But this works well for now.
-    #
-    # The nodes.literal test catches ``literal text``, its purpose is to
-    # avoid adding cross-references to functions that have been explicitly
-    # marked with cc:func:.
-    #
-    for para in doctree.traverse(nodes.paragraph):
-        for node in para.traverse(nodes.Text):
-            if not isinstance(node.parent, nodes.literal):
-                node.parent.replace(node, markup_refs(name, app, node))
-
-def setup(app):
-    app.connect('doctree-resolved', auto_markup)
-    return {
-        'parallel_read_safe': True,
-        'parallel_write_safe': True,
-        }
diff --git a/doc/sphinx/cdomain.py b/doc/sphinx/cdomain.py
index 014a5229e57..cbac8e608dc 100644
--- a/doc/sphinx/cdomain.py
+++ b/doc/sphinx/cdomain.py
@@ -40,94 +40,14 @@ from sphinx import addnodes
 from sphinx.domains.c import c_funcptr_sig_re, c_sig_re
 from sphinx.domains.c import CObject as Base_CObject
 from sphinx.domains.c import CDomain as Base_CDomain
-from itertools import chain
-import re
 
-__version__  = '1.1'
+__version__  = '1.0'
 
 # Get Sphinx version
 major, minor, patch = sphinx.version_info[:3]
 
-# Namespace to be prepended to the full name
-namespace = None
-
-#
-# Handle trivial newer c domain tags that are part of Sphinx 3.1 c domain tags
-# - Store the namespace if ".. c:namespace::" tag is found
-#
-RE_namespace = re.compile(r'^\s*..\s*c:namespace::\s*(\S+)\s*$')
-
-def markup_namespace(match):
-    global namespace
-
-    namespace = match.group(1)
-
-    return ""
-
-#
-# Handle c:macro for function-style declaration
-#
-RE_macro = re.compile(r'^\s*..\s*c:macro::\s*(\S+)\s+(\S.*)\s*$')
-def markup_macro(match):
-    return ".. c:function:: " + match.group(1) + ' ' + match.group(2)
-
-#
-# Handle newer c domain tags that are evaluated as .. c:type: for
-# backward-compatibility with Sphinx < 3.0
-#
-RE_ctype = re.compile(r'^\s*..\s*c:(struct|union|enum|enumerator|alias)::\s*(.*)$')
-
-def markup_ctype(match):
-    return ".. c:type:: " + match.group(2)
-
-#
-# Handle newer c domain tags that are evaluated as :c:type: for
-# backward-compatibility with Sphinx < 3.0
-#
-RE_ctype_refs = re.compile(r':c:(var|struct|union|enum|enumerator)::`([^\`]+)`')
-def markup_ctype_refs(match):
-    return ":c:type:`" + match.group(2) + '`'
-
-#
-# Simply convert :c:expr: and :c:texpr: into a literal block.
-#
-RE_expr = re.compile(r':c:(expr|texpr):`([^\`]+)`')
-def markup_c_expr(match):
-    return '\ ``' + match.group(2) + '``\ '
-
-#
-# Parse Sphinx 3.x C markups, replacing them by backward-compatible ones
-#
-def c_markups(app, docname, source):
-    result = ""
-    markup_func = {
-        RE_namespace: markup_namespace,
-        RE_expr: markup_c_expr,
-        RE_macro: markup_macro,
-        RE_ctype: markup_ctype,
-        RE_ctype_refs: markup_ctype_refs,
-    }
-
-    lines = iter(source[0].splitlines(True))
-    for n in lines:
-        match_iterators = [regex.finditer(n) for regex in markup_func]
-        matches = sorted(chain(*match_iterators), key=lambda m: m.start())
-        for m in matches:
-            n = n[:m.start()] + markup_func[m.re](m) + n[m.end():]
-
-        result = result + n
-
-    source[0] = result
-
-#
-# Now implements support for the cdomain namespacing logic
-#
-
 def setup(app):
 
-    # Handle easy Sphinx 3.1+ simple new tags: :c:expr and .. c:namespace::
-    app.connect('source-read', c_markups)
-
     if (major == 1 and minor < 8):
         app.override_domain(CDomain)
     else:
@@ -155,8 +75,6 @@ class CObject(Base_CObject):
         function-like macro, the name of the macro is returned. Otherwise
         ``False`` is returned.  """
 
-        global namespace
-
         if not self.objtype == 'function':
             return False
 
@@ -189,16 +107,11 @@ class CObject(Base_CObject):
             param += nodes.emphasis(argname, argname)
             paramlist += param
 
-        if namespace:
-            fullname = namespace + "." + fullname
-
         return fullname
 
     def handle_signature(self, sig, signode):
         """Transform a C signature into RST nodes."""
 
-        global namespace
-
         fullname = self.handle_func_like_macro(sig, signode)
         if not fullname:
             fullname = super(CObject, self).handle_signature(sig, signode)
@@ -209,10 +122,6 @@ class CObject(Base_CObject):
             else:
                 # FIXME: handle :name: value of other declaration types?
                 pass
-        else:
-            if namespace:
-                fullname = namespace + "." + fullname
-
         return fullname
 
     def add_target_and_index(self, name, sig, signode):
diff --git a/doc/sphinx/kernel_abi.py b/doc/sphinx/kernel_abi.py
deleted file mode 100644
index f3da859c987..00000000000
--- a/doc/sphinx/kernel_abi.py
+++ /dev/null
@@ -1,194 +0,0 @@
-# -*- coding: utf-8; mode: python -*-
-# coding=utf-8
-# SPDX-License-Identifier: GPL-2.0
-#
-u"""
-    kernel-abi
-    ~~~~~~~~~~
-
-    Implementation of the ``kernel-abi`` reST-directive.
-
-    :copyright:  Copyright (C) 2016  Markus Heiser
-    :copyright:  Copyright (C) 2016-2020  Mauro Carvalho Chehab
-    :maintained-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
-    :license:    GPL Version 2, June 1991 see Linux/COPYING for details.
-
-    The ``kernel-abi`` (:py:class:`KernelCmd`) directive calls the
-    scripts/get_abi.pl script to parse the Kernel ABI files.
-
-    Overview of directive's argument and options.
-
-    .. code-block:: rst
-
-        .. kernel-abi:: <ABI directory location>
-            :debug:
-
-    The argument ``<ABI directory location>`` is required. It contains the
-    location of the ABI files to be parsed.
-
-    ``debug``
-      Inserts a code-block with the *raw* reST. Sometimes it is helpful to see
-      what reST is generated.
-
-"""
-
-import codecs
-import os
-import subprocess
-import sys
-import re
-import kernellog
-
-from os import path
-
-from docutils import nodes, statemachine
-from docutils.statemachine import ViewList
-from docutils.parsers.rst import directives, Directive
-from docutils.utils.error_reporting import ErrorString
-
-#
-# AutodocReporter is only good up to Sphinx 1.7
-#
-import sphinx
-
-Use_SSI = sphinx.__version__[:3] >= '1.7'
-if Use_SSI:
-    from sphinx.util.docutils import switch_source_input
-else:
-    from sphinx.ext.autodoc import AutodocReporter
-
-__version__  = '1.0'
-
-def setup(app):
-
-    app.add_directive("kernel-abi", KernelCmd)
-    return dict(
-        version = __version__
-        , parallel_read_safe = True
-        , parallel_write_safe = True
-    )
-
-class KernelCmd(Directive):
-
-    u"""KernelABI (``kernel-abi``) directive"""
-
-    required_arguments = 1
-    optional_arguments = 2
-    has_content = False
-    final_argument_whitespace = True
-
-    option_spec = {
-        "debug"     : directives.flag,
-        "rst"       : directives.unchanged
-    }
-
-    def run(self):
-
-        doc = self.state.document
-        if not doc.settings.file_insertion_enabled:
-            raise self.warning("docutils: file insertion disabled")
-
-        env = doc.settings.env
-        cwd = path.dirname(doc.current_source)
-        cmd = "get_abi.pl rest --enable-lineno --dir "
-        cmd += self.arguments[0]
-
-        if 'rst' in self.options:
-            cmd += " --rst-source"
-
-        srctree = path.abspath(os.environ["srctree"])
-
-        fname = cmd
-
-        # extend PATH with $(srctree)/scripts
-        path_env = os.pathsep.join([
-            srctree + os.sep + "scripts",
-            os.environ["PATH"]
-        ])
-        shell_env = os.environ.copy()
-        shell_env["PATH"]    = path_env
-        shell_env["srctree"] = srctree
-
-        lines = self.runCmd(cmd, shell=True, cwd=cwd, env=shell_env)
-        nodeList = self.nestedParse(lines, self.arguments[0])
-        return nodeList
-
-    def runCmd(self, cmd, **kwargs):
-        u"""Run command ``cmd`` and return it's stdout as unicode."""
-
-        try:
-            proc = subprocess.Popen(
-                cmd
-                , stdout = subprocess.PIPE
-                , stderr = subprocess.PIPE
-                , **kwargs
-            )
-            out, err = proc.communicate()
-
-            out, err = codecs.decode(out, 'utf-8'), codecs.decode(err, 'utf-8')
-
-            if proc.returncode != 0:
-                raise self.severe(
-                    u"command '%s' failed with return code %d"
-                    % (cmd, proc.returncode)
-                )
-        except OSError as exc:
-            raise self.severe(u"problems with '%s' directive: %s."
-                              % (self.name, ErrorString(exc)))
-        return out
-
-    def nestedParse(self, lines, fname):
-        content = ViewList()
-        node = nodes.section()
-
-        if "debug" in self.options:
-            code_block = "\n\n.. code-block:: rst\n    :linenos:\n"
-            for l in lines.split("\n"):
-                code_block += "\n    " + l
-            lines = code_block + "\n\n"
-
-        line_regex = re.compile("^#define LINENO (\S+)\#([0-9]+)$")
-        ln = 0
-        n = 0
-        f = fname
-
-        for line in lines.split("\n"):
-            n = n + 1
-            match = line_regex.search(line)
-            if match:
-                new_f = match.group(1)
-
-                # Sphinx parser is lazy: it stops parsing contents in the
-                # middle, if it is too big. So, handle it per input file
-                if new_f != f and content:
-                    self.do_parse(content, node)
-                    content = ViewList()
-
-                f = new_f
-
-                # sphinx counts lines from 0
-                ln = int(match.group(2)) - 1
-            else:
-                content.append(line, f, ln)
-
-        kernellog.info(self.state.document.settings.env.app, "%s: parsed %i lines" % (fname, n))
-
-        if content:
-            self.do_parse(content, node)
-
-        return node.children
-
-    def do_parse(self, content, node):
-        if Use_SSI:
-            with switch_source_input(self.state, content):
-                self.state.nested_parse(content, 0, node, match_titles=1)
-        else:
-            buf  = self.state.memo.title_styles, self.state.memo.section_level, self.state.memo.reporter
-
-            self.state.memo.title_styles  = []
-            self.state.memo.section_level = 0
-            self.state.memo.reporter      = AutodocReporter(content, self.state.memo.reporter)
-            try:
-                self.state.nested_parse(content, 0, node, match_titles=1)
-            finally:
-                self.state.memo.title_styles, self.state.memo.section_level, self.state.memo.reporter = buf
diff --git a/doc/sphinx/kernel_feat.py b/doc/sphinx/kernel_feat.py
deleted file mode 100644
index 2fee04f1ded..00000000000
--- a/doc/sphinx/kernel_feat.py
+++ /dev/null
@@ -1,169 +0,0 @@
-# coding=utf-8
-# SPDX-License-Identifier: GPL-2.0
-#
-u"""
-    kernel-feat
-    ~~~~~~~~~~~
-
-    Implementation of the ``kernel-feat`` reST-directive.
-
-    :copyright:  Copyright (C) 2016  Markus Heiser
-    :copyright:  Copyright (C) 2016-2019  Mauro Carvalho Chehab
-    :maintained-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
-    :license:    GPL Version 2, June 1991 see Linux/COPYING for details.
-
-    The ``kernel-feat`` (:py:class:`KernelFeat`) directive calls the
-    scripts/get_feat.pl script to parse the Kernel ABI files.
-
-    Overview of directive's argument and options.
-
-    .. code-block:: rst
-
-        .. kernel-feat:: <ABI directory location>
-            :debug:
-
-    The argument ``<ABI directory location>`` is required. It contains the
-    location of the ABI files to be parsed.
-
-    ``debug``
-      Inserts a code-block with the *raw* reST. Sometimes it is helpful to see
-      what reST is generated.
-
-"""
-
-import codecs
-import os
-import subprocess
-import sys
-
-from os import path
-
-from docutils import nodes, statemachine
-from docutils.statemachine import ViewList
-from docutils.parsers.rst import directives, Directive
-from docutils.utils.error_reporting import ErrorString
-
-#
-# AutodocReporter is only good up to Sphinx 1.7
-#
-import sphinx
-
-Use_SSI = sphinx.__version__[:3] >= '1.7'
-if Use_SSI:
-    from sphinx.util.docutils import switch_source_input
-else:
-    from sphinx.ext.autodoc import AutodocReporter
-
-__version__  = '1.0'
-
-def setup(app):
-
-    app.add_directive("kernel-feat", KernelFeat)
-    return dict(
-        version = __version__
-        , parallel_read_safe = True
-        , parallel_write_safe = True
-    )
-
-class KernelFeat(Directive):
-
-    u"""KernelFeat (``kernel-feat``) directive"""
-
-    required_arguments = 1
-    optional_arguments = 2
-    has_content = False
-    final_argument_whitespace = True
-
-    option_spec = {
-        "debug"     : directives.flag
-    }
-
-    def warn(self, message, **replace):
-        replace["fname"]   = self.state.document.current_source
-        replace["line_no"] = replace.get("line_no", self.lineno)
-        message = ("%(fname)s:%(line_no)s: [kernel-feat WARN] : " + message) % replace
-        self.state.document.settings.env.app.warn(message, prefix="")
-
-    def run(self):
-
-        doc = self.state.document
-        if not doc.settings.file_insertion_enabled:
-            raise self.warning("docutils: file insertion disabled")
-
-        env = doc.settings.env
-        cwd = path.dirname(doc.current_source)
-        cmd = "get_feat.pl rest --dir "
-        cmd += self.arguments[0]
-
-        if len(self.arguments) > 1:
-            cmd += " --arch " + self.arguments[1]
-
-        srctree = path.abspath(os.environ["srctree"])
-
-        fname = cmd
-
-        # extend PATH with $(srctree)/scripts
-        path_env = os.pathsep.join([
-            srctree + os.sep + "scripts",
-            os.environ["PATH"]
-        ])
-        shell_env = os.environ.copy()
-        shell_env["PATH"]    = path_env
-        shell_env["srctree"] = srctree
-
-        lines = self.runCmd(cmd, shell=True, cwd=cwd, env=shell_env)
-        nodeList = self.nestedParse(lines, fname)
-        return nodeList
-
-    def runCmd(self, cmd, **kwargs):
-        u"""Run command ``cmd`` and return it's stdout as unicode."""
-
-        try:
-            proc = subprocess.Popen(
-                cmd
-                , stdout = subprocess.PIPE
-                , stderr = subprocess.PIPE
-                , **kwargs
-            )
-            out, err = proc.communicate()
-
-            out, err = codecs.decode(out, 'utf-8'), codecs.decode(err, 'utf-8')
-
-            if proc.returncode != 0:
-                raise self.severe(
-                    u"command '%s' failed with return code %d"
-                    % (cmd, proc.returncode)
-                )
-        except OSError as exc:
-            raise self.severe(u"problems with '%s' directive: %s."
-                              % (self.name, ErrorString(exc)))
-        return out
-
-    def nestedParse(self, lines, fname):
-        content = ViewList()
-        node    = nodes.section()
-
-        if "debug" in self.options:
-            code_block = "\n\n.. code-block:: rst\n    :linenos:\n"
-            for l in lines.split("\n"):
-                code_block += "\n    " + l
-            lines = code_block + "\n\n"
-
-        for c, l in enumerate(lines.split("\n")):
-            content.append(l, fname, c)
-
-        buf  = self.state.memo.title_styles, self.state.memo.section_level, self.state.memo.reporter
-
-        if Use_SSI:
-            with switch_source_input(self.state, content):
-                self.state.nested_parse(content, 0, node, match_titles=1)
-        else:
-            self.state.memo.title_styles  = []
-            self.state.memo.section_level = 0
-            self.state.memo.reporter      = AutodocReporter(content, self.state.memo.reporter)
-            try:
-                self.state.nested_parse(content, 0, node, match_titles=1)
-            finally:
-                self.state.memo.title_styles, self.state.memo.section_level, self.state.memo.reporter = buf
-
-        return node.children
diff --git a/doc/sphinx/kerneldoc.py b/doc/sphinx/kerneldoc.py
index e9857ab904f..4bcbd6ae01c 100644
--- a/doc/sphinx/kerneldoc.py
+++ b/doc/sphinx/kerneldoc.py
@@ -62,7 +62,6 @@ class KernelDocDirective(Directive):
         'export': directives.unchanged,
         'internal': directives.unchanged,
         'identifiers': directives.unchanged,
-        'no-identifiers': directives.unchanged,
         'functions': directives.unchanged,
     }
     has_content = False
@@ -71,11 +70,6 @@ class KernelDocDirective(Directive):
         env = self.state.document.settings.env
         cmd = [env.config.kerneldoc_bin, '-rst', '-enable-lineno']
 
-	# Pass the version string to kernel-doc, as it needs to use a different
-	# dialect, depending what the C domain supports for each specific
-	# Sphinx versions
-        cmd += ['-sphinx-version', sphinx.__version__]
-
         filename = env.config.kerneldoc_srctree + '/' + self.arguments[0]
         export_file_patterns = []
 
@@ -105,12 +99,6 @@ class KernelDocDirective(Directive):
             else:
                 cmd += ['-no-doc-sections']
 
-        if 'no-identifiers' in self.options:
-            no_identifiers = self.options.get('no-identifiers').split()
-            if no_identifiers:
-                for i in no_identifiers:
-                    cmd += ['-nosymbol', i]
-
         for pattern in export_file_patterns:
             for f in glob.glob(env.config.kerneldoc_srctree + '/' + pattern):
                 env.note_dependency(os.path.abspath(f))
@@ -148,8 +136,7 @@ class KernelDocDirective(Directive):
                     lineoffset = int(match.group(1)) - 1
                     # we must eat our comments since the upset the markup
                 else:
-                    doc = env.srcdir + "/" + env.docname + ":" + str(self.lineno)
-                    result.append(line, doc + ": " + filename, lineoffset)
+                    result.append(line, filename, lineoffset)
                     lineoffset += 1
 
             node = nodes.section()
diff --git a/doc/sphinx/kernellog.py b/doc/sphinx/kernellog.py
index 8ac7d274f54..af924f51a7d 100644
--- a/doc/sphinx/kernellog.py
+++ b/doc/sphinx/kernellog.py
@@ -25,8 +25,4 @@ def verbose(app, message):
     else:
         app.verbose(message)
 
-def info(app, message):
-    if UseLogging:
-        logger.info(message)
-    else:
-        app.info(message)
+
diff --git a/doc/sphinx/kfigure.py b/doc/sphinx/kfigure.py
index 788704886ee..fbfe6693bb6 100644
--- a/doc/sphinx/kfigure.py
+++ b/doc/sphinx/kfigure.py
@@ -29,7 +29,7 @@ u"""
 
     Used tools:
 
-    * ``dot(1)``: Graphviz (https://www.graphviz.org). If Graphviz is not
+    * ``dot(1)``: Graphviz (http://www.graphviz.org). If Graphviz is not
       available, the DOT language is inserted as literal-block.
 
     * SVG to PDF: To generate PDF, you need at least one of this tools:
@@ -41,7 +41,7 @@ u"""
     * generate PDF from SVG / used by PDF (LaTeX) builder
 
     * generate SVG (html-builder) and PDF (latex-builder) from DOT files.
-      DOT: see https://www.graphviz.org/content/dot-language
+      DOT: see http://www.graphviz.org/content/dot-language
 
     """
 
@@ -182,7 +182,7 @@ def setupTools(app):
         kernellog.verbose(app, "use dot(1) from: " + dot_cmd)
     else:
         kernellog.warn(app, "dot(1) not found, for better output quality install "
-                       "graphviz from https://www.graphviz.org")
+                       "graphviz from http://www.graphviz.org")
     if convert_cmd:
         kernellog.verbose(app, "use convert(1) from: " + convert_cmd)
     else:
diff --git a/doc/sphinx/load_config.py b/doc/sphinx/load_config.py
index eeb394b39e2..301a21aa4f6 100644
--- a/doc/sphinx/load_config.py
+++ b/doc/sphinx/load_config.py
@@ -21,29 +21,6 @@ def loadConfig(namespace):
         and os.path.normpath(namespace["__file__"]) != os.path.normpath(config_file) ):
         config_file = os.path.abspath(config_file)
 
-        # Let's avoid one conf.py file just due to latex_documents
-        start = config_file.find('Documentation/')
-        if start >= 0:
-            start = config_file.find('/', start + 1)
-
-        end = config_file.rfind('/')
-        if start >= 0 and end > 0:
-            dir = config_file[start + 1:end]
-
-            print("source directory: %s" % dir)
-            new_latex_docs = []
-            latex_documents = namespace['latex_documents']
-
-            for l in latex_documents:
-                if l[0].find(dir + '/') == 0:
-                    has = True
-                    fn = l[0][len(dir) + 1:]
-                    new_latex_docs.append((fn, l[1], l[2], l[3], l[4]))
-                    break
-
-            namespace['latex_documents'] = new_latex_docs
-
-        # If there is an extra conf.py file, load it
         if os.path.isfile(config_file):
             sys.stdout.write("load additional sphinx-config: %s\n" % config_file)
             config = namespace.copy()
@@ -52,6 +29,4 @@ def loadConfig(namespace):
             del config['__file__']
             namespace.update(config)
         else:
-            config = namespace.copy()
-            config['tags'].add("subproject")
-            namespace.update(config)
+            sys.stderr.write("WARNING: additional sphinx-config not found: %s\n" % config_file)
diff --git a/doc/sphinx/maintainers_include.py b/doc/sphinx/maintainers_include.py
deleted file mode 100755
index dc8fed48d3c..00000000000
--- a/doc/sphinx/maintainers_include.py
+++ /dev/null
@@ -1,197 +0,0 @@
-#!/usr/bin/env python
-# SPDX-License-Identifier: GPL-2.0
-# -*- coding: utf-8; mode: python -*-
-# pylint: disable=R0903, C0330, R0914, R0912, E0401
-
-u"""
-    maintainers-include
-    ~~~~~~~~~~~~~~~~~~~
-
-    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 sys
-import re
-import os.path
-
-from docutils import statemachine
-from docutils.utils.error_reporting import ErrorString
-from docutils.parsers.rst import Directive
-from docutils.parsers.rst.directives.misc import Include
-
-__version__  = '1.0'
-
-def setup(app):
-    app.add_directive("maintainers-include", MaintainersInclude)
-    return dict(
-        version = __version__,
-        parallel_read_safe = True,
-        parallel_write_safe = True
-    )
-
-class MaintainersInclude(Include):
-    u"""MaintainersInclude (``maintainers-include``) directive"""
-    required_arguments = 0
-
-    def parse_maintainers(self, path):
-        """Parse all the MAINTAINERS lines into ReST for human-readability"""
-
-        result = list()
-        result.append(".. _maintainers:")
-        result.append("")
-
-        # Poor man's state machine.
-        descriptions = False
-        maintainers = False
-        subsystems = False
-
-        # Field letter to field name mapping.
-        field_letter = None
-        fields = dict()
-
-        prev = None
-        field_prev = ""
-        field_content = ""
-
-        for line in open(path):
-            if sys.version_info.major == 2:
-                line = unicode(line, 'utf-8')
-            # Have we reached the end of the preformatted Descriptions text?
-            if descriptions and line.startswith('Maintainers'):
-                descriptions = False
-                # Ensure a blank line following the last "|"-prefixed line.
-                result.append("")
-
-            # Start subsystem processing? This is to skip processing the text
-            # between the Maintainers heading and the first subsystem name.
-            if maintainers and not subsystems:
-                if re.search('^[A-Z0-9]', line):
-                    subsystems = True
-
-            # Drop needless input whitespace.
-            line = line.rstrip()
-
-            # Linkify all non-wildcard refs to ReST files in Documentation/.
-            pat = '(Documentation/([^\s\?\*]*)\.rst)'
-            m = re.search(pat, line)
-            if m:
-                # maintainers.rst is in a subdirectory, so include "../".
-                line = re.sub(pat, ':doc:`%s <../%s>`' % (m.group(2), m.group(2)), line)
-
-            # Check state machine for output rendering behavior.
-            output = None
-            if descriptions:
-                # Escape the escapes in preformatted text.
-                output = "| %s" % (line.replace("\\", "\\\\"))
-                # Look for and record field letter to field name mappings:
-                #   R: Designated *reviewer*: FullName <address@domain>
-                m = re.search("\s(\S):\s", line)
-                if m:
-                    field_letter = m.group(1)
-                if field_letter and not field_letter in fields:
-                    m = re.search("\*([^\*]+)\*", line)
-                    if m:
-                        fields[field_letter] = m.group(1)
-            elif subsystems:
-                # Skip empty lines: subsystem parser adds them as needed.
-                if len(line) == 0:
-                    continue
-                # Subsystem fields are batched into "field_content"
-                if line[1] != ':':
-                    # Render a subsystem entry as:
-                    #   SUBSYSTEM NAME
-                    #   ~~~~~~~~~~~~~~
-
-                    # Flush pending field content.
-                    output = field_content + "\n\n"
-                    field_content = ""
-
-                    # Collapse whitespace in subsystem name.
-                    heading = re.sub("\s+", " ", line)
-                    output = output + "%s\n%s" % (heading, "~" * len(heading))
-                    field_prev = ""
-                else:
-                    # Render a subsystem field as:
-                    #   :Field: entry
-                    #           entry...
-                    field, details = line.split(':', 1)
-                    details = details.strip()
-
-                    # 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 not ':doc:' in details:
-                            details = '``%s``' % (details)
-
-                    # Comma separate email field continuations.
-                    if field == field_prev and field_prev in ['M', 'R', 'L']:
-                        field_content = field_content + ","
-
-                    # Do not repeat field names, so that field entries
-                    # will be collapsed together.
-                    if field != field_prev:
-                        output = field_content + "\n"
-                        field_content = ":%s:" % (fields.get(field, field))
-                    field_content = field_content + "\n\t%s" % (details)
-                    field_prev = field
-            else:
-                output = line
-
-            # Re-split on any added newlines in any above parsing.
-            if output != None:
-                for separated in output.split('\n'):
-                    result.append(separated)
-
-            # Update the state machine when we find heading separators.
-            if line.startswith('----------'):
-                if prev.startswith('Descriptions'):
-                    descriptions = True
-                if prev.startswith('Maintainers'):
-                    maintainers = True
-
-            # Retain previous line for state machine transitions.
-            prev = line
-
-        # Flush pending field contents.
-        if field_content != "":
-            for separated in field_content.split('\n'):
-                result.append(separated)
-
-        output = "\n".join(result)
-        # For debugging the pre-rendered results...
-        #print(output, file=open("/tmp/MAINTAINERS.rst", "w"))
-
-        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)
-
-        # Walk up source path directories to find Documentation/../
-        path = self.state_machine.document.attributes['source']
-        path = os.path.realpath(path)
-        tail = path
-        while tail != "Documentation" and tail != "":
-            (path, tail) = os.path.split(path)
-
-        # Append "MAINTAINERS"
-        path = os.path.join(path, "MAINTAINERS")
-
-        try:
-            self.state.document.settings.record_dependencies.add(path)
-            lines = self.parse_maintainers(path)
-        except IOError as error:
-            raise self.severe('Problems with "%s" directive path:\n%s.' %
-                      (self.name, ErrorString(error)))
-
-        return []
diff --git a/doc/sphinx/parallel-wrapper.sh b/doc/sphinx/parallel-wrapper.sh
deleted file mode 100644
index e54c44ce117..00000000000
--- a/doc/sphinx/parallel-wrapper.sh
+++ /dev/null
@@ -1,33 +0,0 @@
-#!/bin/sh
-# SPDX-License-Identifier: GPL-2.0+
-#
-# Figure out if we should follow a specific parallelism from the make
-# environment (as exported by scripts/jobserver-exec), or fall back to
-# the "auto" parallelism when "-jN" is not specified at the top-level
-# "make" invocation.
-
-sphinx="$1"
-shift || true
-
-parallel="$PARALLELISM"
-if [ -z "$parallel" ] ; then
-	# If no parallelism is specified at the top-level make, then
-	# fall back to the expected "-jauto" mode that the "htmldocs"
-	# target has had.
-	auto=$(perl -e 'open IN,"'"$sphinx"' --version 2>&1 |";
-			while (<IN>) {
-				if (m/([\d\.]+)/) {
-					print "auto" if ($1 >= "1.7")
-				}
-			}
-			close IN')
-	if [ -n "$auto" ] ; then
-		parallel="$auto"
-	fi
-fi
-# Only if some parallelism has been determined do we add the -jN option.
-if [ -n "$parallel" ] ; then
-	parallel="-j$parallel"
-fi
-
-exec "$sphinx" $parallel "$@"
diff --git a/doc/sphinx/parse-headers.pl b/doc/sphinx/parse-headers.pl
index b063f2f1cfb..c518050ffc3 100755
--- a/doc/sphinx/parse-headers.pl
+++ b/doc/sphinx/parse-headers.pl
@@ -1,4 +1,4 @@
-#!/usr/bin/env perl
+#!/usr/bin/perl
 use strict;
 use Text::Tabs;
 use Getopt::Long;
@@ -110,7 +110,7 @@ while (<IN>) {
 	    ) {
 		my $s = $1;
 
-		$structs{$s} = "struct $s\\ ";
+		$structs{$s} = "struct :c:type:`$s`\\ ";
 		next;
 	}
 }
@@ -393,7 +393,7 @@ Report bugs to Mauro Carvalho Chehab <mchehab@kernel.org>
 
 Copyright (c) 2016 by Mauro Carvalho Chehab <mchehab+samsung@kernel.org>.
 
-License GPLv2: GNU GPL version 2 <https://gnu.org/licenses/gpl.html>.
+License GPLv2: GNU GPL version 2 <http://gnu.org/licenses/gpl.html>.
 
 This is free software: you are free to change and redistribute it.
 There is NO WARRANTY, to the extent permitted by law.
diff --git a/doc/sphinx/requirements.txt b/doc/sphinx/requirements.txt
index 5030d346d23..742be3e1261 100644
--- a/doc/sphinx/requirements.txt
+++ b/doc/sphinx/requirements.txt
@@ -1,4 +1,3 @@
-docutils
-Sphinx==2.4.4
+docutils==0.12
+Sphinx==1.4.9
 sphinx_rtd_theme
-six