[PATCH 1/2] doc/sphinx: fix Python string escapes

[Heinrich Schuchardt]

From: Benjamin Gray <bgray at linux.ibm.com>

Python 3.6 introduced a DeprecationWarning for invalid escape sequences.
This is upgraded to a SyntaxWarning in Python 3.12, and will eventually
be a syntax error.

Fix these now to get ahead of it before it's an error.

Signed-off-by: Benjamin Gray <bgray at linux.ibm.com>
Message-ID: <20230912060801.95533-3-bgray at linux.ibm.com>
Signed-off-by: Jonathan Corbet <corbet at lwn.net>

Adapted for U-Boot
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt at canonical.com>
---
 doc/sphinx/cdomain.py             | 2 +-
 doc/sphinx/kernel_abi.py          | 2 +-
 doc/sphinx/kerneldoc.py           | 2 +-
 doc/sphinx/maintainers_include.py | 8 ++++----
 4 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/doc/sphinx/cdomain.py b/doc/sphinx/cdomain.py
index 014a5229e57..491a7ed5f47 100644
--- a/doc/sphinx/cdomain.py
+++ b/doc/sphinx/cdomain.py
@@ -93,7 +93,7 @@ def markup_ctype_refs(match):
 #
 RE_expr = re.compile(r':c:(expr|texpr):`([^\`]+)`')
 def markup_c_expr(match):
-    return '\ ``' + match.group(2) + '``\ '
+    return '\\ ``' + match.group(2) + '``\\ '
 
 #
 # Parse Sphinx 3.x C markups, replacing them by backward-compatible ones
diff --git a/doc/sphinx/kernel_abi.py b/doc/sphinx/kernel_abi.py
index f3da859c987..32c50e496b5 100644
--- a/doc/sphinx/kernel_abi.py
+++ b/doc/sphinx/kernel_abi.py
@@ -147,7 +147,7 @@ class KernelCmd(Directive):
                 code_block += "\n    " + l
             lines = code_block + "\n\n"
 
-        line_regex = re.compile("^#define LINENO (\S+)\#([0-9]+)$")
+        line_regex = re.compile(r"^#define LINENO (\S+)\#([0-9]+)$")
         ln = 0
         n = 0
         f = fname
diff --git a/doc/sphinx/kerneldoc.py b/doc/sphinx/kerneldoc.py
index 01a55429c57..bc8bb9e5125 100644
--- a/doc/sphinx/kerneldoc.py
+++ b/doc/sphinx/kerneldoc.py
@@ -130,7 +130,7 @@ class KernelDocDirective(Directive):
             result = ViewList()
 
             lineoffset = 0;
-            line_regex = re.compile("^#define LINENO ([0-9]+)$")
+            line_regex = re.compile(r"^#define LINENO ([0-9]+)$")
             for line in lines:
                 match = line_regex.search(line)
                 if match:
diff --git a/doc/sphinx/maintainers_include.py b/doc/sphinx/maintainers_include.py
index dc8fed48d3c..6cee52cbb39 100755
--- a/doc/sphinx/maintainers_include.py
+++ b/doc/sphinx/maintainers_include.py
@@ -79,7 +79,7 @@ class MaintainersInclude(Include):
             line = line.rstrip()
 
             # Linkify all non-wildcard refs to ReST files in Documentation/.
-            pat = '(Documentation/([^\s\?\*]*)\.rst)'
+            pat = r'(Documentation/([^\s\?\*]*)\.rst)'
             m = re.search(pat, line)
             if m:
                 # maintainers.rst is in a subdirectory, so include "../".
@@ -92,11 +92,11 @@ class MaintainersInclude(Include):
                 output = "| %s" % (line.replace("\\", "\\\\"))
                 # Look for and record field letter to field name mappings:
                 #   R: Designated *reviewer*: FullName <address at domain>
-                m = re.search("\s(\S):\s", line)
+                m = re.search(r"\s(\S):\s", line)
                 if m:
                     field_letter = m.group(1)
                 if field_letter and not field_letter in fields:
-                    m = re.search("\*([^\*]+)\*", line)
+                    m = re.search(r"\*([^\*]+)\*", line)
                     if m:
                         fields[field_letter] = m.group(1)
             elif subsystems:
@@ -114,7 +114,7 @@ class MaintainersInclude(Include):
                     field_content = ""
 
                     # Collapse whitespace in subsystem name.
-                    heading = re.sub("\s+", " ", line)
+                    heading = re.sub(r"\s+", " ", line)
                     output = output + "%s\n%s" % (heading, "~" * len(heading))
                     field_prev = ""
                 else:
-- 
2.43.0