linux-kernel - Re: [Regression] Docs build broken by commit 51e46c7a4007

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Message-ID: <202002201158.2911CE2388@keescook>
Date:   Thu, 20 Feb 2020 12:05:20 -0800
From:   Kees Cook <keescook@...omium.org>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     Jonathan Corbet <corbet@....net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>
Subject: Re: [Regression] Docs build broken by commit 51e46c7a4007

On Thu, Feb 20, 2020 at 07:50:47PM +0100, Rafael J. Wysocki wrote:
> On two of my systems the docs build has been broken by commit
> 51e46c7a4007 ("docs, parallelism: Rearrange how jobserver reservations
> are made").
> 
> The symptom is that the build system complains about the "output"
> directory not being there and returns with an error.
> 
> Reverting the problematic commit makes the problem go away.

How strange! This must be some race in the parallel build. AFAICT,
"output" is made in the first sub-target (Documentation/media). This
doesn't look entirely stable (there's no ordering implied by the "all"
target in there)...

Does this work for you?


diff --git a/Documentation/Makefile b/Documentation/Makefile
index d77bb607aea4..5654e087ae1e 100644
--- a/Documentation/Makefile
+++ b/Documentation/Makefile
@@ -62,7 +62,8 @@ loop_cmd = $(echo-cmd) $(cmd_$(1)) || exit;
 #    e.g. "media" for the linux-tv book-set at ./Documentation/media
 
 quiet_cmd_sphinx = SPHINX  $@ --> file://$(abspath $(BUILDDIR)/$3/$4)
-      cmd_sphinx = $(MAKE) BUILDDIR=$(abspath $(BUILDDIR)) $(build)=Documentation/media $2 && \
+      cmd_sphinx = mkdir -p $(abspath $(BUILDDIR)) && \
+	$(MAKE) BUILDDIR=$(abspath $(BUILDDIR)) $(build)=Documentation/media $2 && \
 	PYTHONDONTWRITEBYTECODE=1 \
 	BUILDDIR=$(abspath $(BUILDDIR)) SPHINX_CONF=$(abspath $(srctree)/$(src)/$5/$(SPHINX_CONF)) \
 	$(PYTHON) $(srctree)/scripts/jobserver-exec \

-- 
Kees Cook