docs: kdoc: handle the obsolescensce of docutils.ErrorString()

The ErrorString() and SafeString() docutils functions were helpers meant to
ease the handling of encodings during the Python 3 transition.  There is no
real need for them after Python 3.6, and docutils 0.22 removes them,
breaking the docs build

Handle this by just injecting our own one-liner version of ErrorString(),
and removing the sole SafeString() call entirely.

Reported-by: Zhixu Liu <[email protected]>
Signed-off-by: Jonathan Corbet <[email protected]>
Upstream: https://git.kernel.org/linus/00d95fcc4dee66dfb6980de6f2973b32f973a1eb
[j.ne: Adapted from Linux to U-Boot]
Signed-off-by: J. Neuschäfer <[email protected]>
Reviewed-by: Heinrich Schuchardt <[email protected]>

1 files changed, 3 insertions, 1 deletions

diff --git a/doc/sphinx/kernel_feat.py b/doc/sphinx/kernel_feat.py
index 2fee04f1ded..cca48f6f1a4 100644
--- a/doc/sphinx/kernel_feat.py
+++ b/doc/sphinx/kernel_feat.py
@@ -41,7 +41,9 @@ 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
+
+def ErrorString(exc):  # Shamelessly stolen from docutils
+    return f'{exc.__class__.__name}: {exc}'
 
 #
 # AutodocReporter is only good up to Sphinx 1.7