linux-kernel - Re: [PATCH v3] docs: Use make invocation's -j argument for parallelism

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Date:   Fri, 4 Oct 2019 10:04:03 +0200
From:   Christian Borntraeger <borntraeger@...ibm.com>
To:     Kees Cook <keescook@...omium.org>, Jonathan Corbet <corbet@....net>
Cc:     Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Linux-Next Mailing List <linux-next@...r.kernel.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: [PATCH v3] docs: Use make invocation's -j argument for
 parallelism


On 25.09.19 01:29, Kees Cook wrote:
> While sphinx 1.7 and later supports "-jauto" for parallelism, this
> effectively ignores the "-j" flag used in the "make" invocation, which
> may cause confusion for build systems. Instead, extract the available
> parallelism from "make"'s job server (since it is not exposed in any
> special variables) and use that for the "sphinx-build" run. Now things
> work correctly for builds where -j is specified at the top-level:
> 
> 	make -j16 htmldocs
> 
> If -j is not specified, continue to fallback to "-jauto" if available.
> 
> Signed-off-by: Kees Cook <keescook@...omium.org>
> ---
> v3: python2, specific exceptions, correct SPDX, blocking writer
> v2: retain "-jauto" default behavior with top-level -j is missing.              
[...]
> diff --git a/scripts/jobserver-count b/scripts/jobserver-count
> new file mode 100755
> index 000000000000..0b482d6884d2
> --- /dev/null
> +++ b/scripts/jobserver-count
> @@ -0,0 +1,58 @@
> +#!/usr/bin/env python


This breaks our daily linux-next build for an fedora 30 rpm on s390x:

+ /usr/lib/rpm/redhat/brp-mangle-shebangs
mangling shebang in /usr/src/kernels/5.4.0-20191004.rc1.git155.311ef88adfa3.301.fc30.s390x+next/scripts/profile2linkerlist.pl from /usr/bin/env perl to #!/usr/bin/perl
mangling shebang in /usr/src/kernels/5.4.0-20191004.rc1.git155.311ef88adfa3.301.fc30.s390x+next/scripts/headerdep.pl from /usr/bin/env perl to #!/usr/bin/perl
mangling shebang in /usr/src/kernels/5.4.0-20191004.rc1.git155.311ef88adfa3.301.fc30.s390x+next/scripts/package/buildtar from /bin/sh to #!/usr/bin/sh
mangling shebang in /usr/src/kernels/5.4.0-20191004.rc1.git155.311ef88adfa3.301.fc30.s390x+next/scripts/package/builddeb from /bin/sh to #!/usr/bin/sh
mangling shebang in /usr/src/kernels/5.4.0-20191004.rc1.git155.311ef88adfa3.301.fc30.s390x+next/scripts/package/mkspec from /bin/sh to #!/usr/bin/sh
mangling shebang in /usr/src/kernels/5.4.0-20191004.rc1.git155.311ef88adfa3.301.fc30.s390x+next/scripts/package/mkdebian from /bin/sh to #!/usr/bin/sh
mangling shebang in /usr/src/kernels/5.4.0-20191004.rc1.git155.311ef88adfa3.301.fc30.s390x+next/scripts/checksyscalls.sh from /bin/sh to #!/usr/bin/sh
mangling shebang in /usr/src/kernels/5.4.0-20191004.rc1.git155.311ef88adfa3.301.fc30.s390x+next/scripts/gen_ksymdeps.sh from /bin/sh to #!/usr/bin/sh
mangling shebang in /usr/src/kernels/5.4.0-20191004.rc1.git155.311ef88adfa3.301.fc30.s390x+next/scripts/makelst from /bin/sh to #!/usr/bin/sh
mangling shebang in /usr/src/kernels/5.4.0-20191004.rc1.git155.311ef88adfa3.301.fc30.s390x+next/scripts/checkversion.pl from /usr/bin/env perl to #!/usr/bin/perl
mangling shebang in /usr/src/kernels/5.4.0-20191004.rc1.git155.311ef88adfa3.301.fc30.s390x+next/scripts/gcc-plugin.sh from /bin/sh to #!/usr/bin/sh
mangling shebang in /usr/src/kernels/5.4.0-20191004.rc1.git155.311ef88adfa3.301.fc30.s390x+next/scripts/gfp-translate from /bin/bash to #!/usr/bin/bash
mangling shebang in /usr/src/kernels/5.4.0-20191004.rc1.git155.311ef88adfa3.301.fc30.s390x+next/scripts/tags.sh from /bin/bash to #!/usr/bin/bash
*** ERROR: ambiguous python shebang in /usr/src/kernels/5.4.0-20191004.rc1.git155.311ef88adfa3.301.fc30.s390x+next/scripts/jobserver-count: #!/usr/bin/env python. Change it to python3 (or python2) explicitly.
mangling shebang in /usr/src/kernels/5.4.0-20191004.rc1.git155.311ef88adfa3.301.fc30.s390x+next/scripts/adjust_autoksyms.sh from /bin/sh to #!/usr/bin/sh
mangling shebang in /usr/src/kernels/5.4.0-20191004.rc1.git155.311ef88adfa3.301.fc30.s390x+next/scripts/kernel-doc from /usr/bin/env perl to #!/usr/bin/perl
[...]