From: Akira Yokosawa <akiyks@xxxxxxxxx> commit 627f01eab93d8671d4e4afee9b148f9998d20e7c upstream. One of the changes in Sphinx 5.0.0 [1] says [sic]: 5.0.0 final - #10474: language does not accept None as it value. The default value of language becomes to 'en' now. [1]: https://www.sphinx-doc.org/en/master/changes.html#release-5-0-0-released-may-30-2022 It results in a new warning from Sphinx 5.0.0 [sic]: WARNING: Invalid configuration value found: 'language = None'. Update your configuration to a valid langauge code. Falling back to 'en' (English). Silence the warning by using 'en'. It works with all the Sphinx versions required for building kernel documentation (1.7.9 or later). Signed-off-by: Akira Yokosawa <akiyks@xxxxxxxxx> Link: https://lore.kernel.org/r/bd0c2ddc-2401-03cb-4526-79ca664e1cbe@xxxxxxxxx Cc: stable@xxxxxxxxxxxxxxx Signed-off-by: Jonathan Corbet <corbet@xxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- Documentation/conf.py | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/Documentation/conf.py +++ b/Documentation/conf.py @@ -95,7 +95,7 @@ finally: # # This is also used if you do content translation via gettext catalogs. # Usually you set "language" from the command line for these cases. -language = None +language = 'en' # There are two options for replacing |today|: either, you set today to some # non-false value, then it is used: