[PATCH] Documentation: Drop use of 'cdomain' sphinx extension module

[Salvatore Bonaccorso]

'c_funcptr_sig_re' was removed upstream in sphinx v3.0.0b1 and so the
kernel documentation build fails sphinx 3.x.

As a (temporary) workaround to make the documentation build, the
'cdomain' sphinx extension can be removed from the Documentation build
configuration file, although some parts using the feature will be
broken.

https://github.com/sphinx-doc/sphinx/issues/7421 describes the
workaround.

Cc: Markus Heiser <markus.heiser@xxxxxxxxxxx>
Cc: Justin M. Forbes <jforbes@xxxxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/linux-doc/20200809132327.GA145573@eldamar.local/
Link: https://bugs.archlinux.org/task/66178
Link: https://bugs.archlinux.org/task/66156
Link: https://bugs.debian.org/963636
Signed-off-by: Salvatore Bonaccorso <carnil@xxxxxxxxxx>
---
 Documentation/conf.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Documentation/conf.py b/Documentation/conf.py
index c503188880d9..b5b2be8eec22 100644
--- a/Documentation/conf.py
+++ b/Documentation/conf.py
@@ -36,7 +36,7 @@ needs_sphinx = '1.3'
 # Add any Sphinx extension module names here, as strings. They can be
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
 # ones.
-extensions = ['kerneldoc', 'rstFlatTable', 'kernel_include', 'cdomain',
+extensions = ['kerneldoc', 'rstFlatTable', 'kernel_include',
               'kfigure', 'sphinx.ext.ifconfig', 'automarkup',
               'maintainers_include', 'sphinx.ext.autosectionlabel' ]
 
-- 
2.28.0