doc: Build documentation in parallel
With the addition of the revision stats this now takes over a minute. Use
a parallel build to reduce it a bit (24 seconds for me).
Series-changes; 2
- Use '-j auto' instead
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/doc/Makefile b/doc/Makefile
index 6081858..f5de65e 100644
--- a/doc/Makefile
+++ b/doc/Makefile
@@ -58,6 +58,7 @@
$(SPHINXBUILD) \
-j$(shell nproc) \
-b $2 \
+ -j auto \
-c $(abspath $(srctree)/$(src)) \
-d $(abspath $(BUILDDIR)/.doctrees/$3) \
-D version=$(KERNELVERSION) -D release=$(KERNELRELEASE) \