[PATCH] docs: Build kernel docs deterministically

[bernhard+linux-doc@lsmod.de]

From: "Bernhard M. Wiedemann" <bwiedemann@suse.de>

Because we want reproducible builds
and https://github.com/sphinx-doc/sphinx/issues/6714
did not receive any love from Sphinx devs in five years,
let's disable parallel doc builds until that Sphinx issue is fixed.

This patch was done while working on reproducible builds for openSUSE,
sponsored by the NLnet NGI0 fund.

Signed-off-by: Bernhard M. Wiedemann <bwiedemann@suse.de>
---
 Documentation/sphinx/parallel-wrapper.sh | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/sphinx/parallel-wrapper.sh b/Documentation/sphinx/parallel-wrapper.sh
index e54c44ce117d..cb93626bd86e 100644
--- a/Documentation/sphinx/parallel-wrapper.sh
+++ b/Documentation/sphinx/parallel-wrapper.sh
@@ -10,6 +10,9 @@ sphinx="$1"
 shift || true
 
 parallel="$PARALLELISM"
+# Because of issues in Sphinx(https://github.com/sphinx-doc/sphinx/issues/6714)
+# we disable parallel doc generation to get deterministic build results
+parallel=1
 if [ -z "$parallel" ] ; then
 	# If no parallelism is specified at the top-level make, then
 	# fall back to the expected "-jauto" mode that the "htmldocs"
-- 
2.46.0