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

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Date:   Thu, 20 Feb 2020 22:44:35 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        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 9:05 PM Kees Cook <keescook@...omium.org> wrote:
>
> 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.

I don't think so, I didn't use -j with htmldocs builds.

And you know what, adding "-j 2" to the command line actually makes it work. :-)

> 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?

No, it doesn't.

>
> 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 \
>
> --