Re: [PATCH] kbuild: Add an option to skip vmlinux.bz2 in the rpm's

From: Masahiro Yamada <masahiroy@kernel.org>
To: Zack Rusin <zackr@vmware.com>
Cc: Michal Marek <michal.lkml@markovi.net>,
	Nick Desaulniers <ndesaulniers@google.com>,
	Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] kbuild: Add an option to skip vmlinux.bz2 in the rpm's
Date: Tue, 27 Sep 2022 02:38:47 +0900	[thread overview]
Message-ID: <CAK7LNARRUbcZLNUOY-is=EVC7Ov8-0SHS=207=XbQkkjS59g4Q@mail.gmail.com> (raw)
In-Reply-To: <20220922184525.3021522-1-zack@kde.org>

On Fri, Sep 23, 2022 at 3:45 AM Zack Rusin <zack@kde.org> wrote:
>
> From: Zack Rusin <zackr@vmware.com>
>
> The debug vmlinux takes up the vast majority of space in the built
> rpm's. While having it enabled by default is a good idea because it
> makes debugging easier, having an option to skip it is highly valuable
> for CI/CD systems where small packages are a lot easier to deal with
> e.g. kernel rpm built using binrpm-pkg on Fedora 36 default 5.19.8 kernel
> config and localmodconfig goes from 255MB to 65MB which is an almost
> 4x difference.
>
> To skip adding vmlinux.bz2 to the built rpm add SKIP_RPM_VMLINUX
> environment variable which when set to "y", e.g. via
> "SKIP_RPM_VMLINUX=y make binrpm-pkg" won't include vmlinux.bz2 in the
> built rpm.
>
> Signed-off-by: Zack Rusin <zackr@vmware.com>
> Cc: Masahiro Yamada <masahiroy@kernel.org>
> Cc: Michal Marek <michal.lkml@markovi.net>
> Cc: Nick Desaulniers <ndesaulniers@google.com>
> Cc: linux-kbuild@vger.kernel.org
> Cc: linux-kernel@vger.kernel.org
> ---
>  scripts/package/mkspec | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
>
> diff --git a/scripts/package/mkspec b/scripts/package/mkspec
> index 7c477ca7dc98..5a71fc0852b0 100755
> --- a/scripts/package/mkspec
> +++ b/scripts/package/mkspec
> @@ -23,6 +23,12 @@ else
>         M=DEL
>  fi
>
> +if [ "$RPM_SKIP_VMLINUX" = y ]; then
> +       D=DEL
> +else
> +       D=
> +fi
> +
>  if grep -q CONFIG_DRM=y .config; then
>         PROVIDES=kernel-drm
>  fi
> @@ -94,8 +100,8 @@ $M   $MAKE %{?_smp_mflags} INSTALL_MOD_PATH=%{buildroot} modules_install
>         $MAKE %{?_smp_mflags} INSTALL_HDR_PATH=%{buildroot}/usr headers_install
>         cp System.map %{buildroot}/boot/System.map-$KERNELRELEASE
>         cp .config %{buildroot}/boot/config-$KERNELRELEASE
> -       bzip2 -9 --keep vmlinux
> -       mv vmlinux.bz2 %{buildroot}/boot/vmlinux-$KERNELRELEASE.bz2
> +$D     bzip2 -9 --keep vmlinux
> +$D     mv vmlinux.bz2 %{buildroot}/boot/vmlinux-$KERNELRELEASE.bz2
>  $S$M   rm -f %{buildroot}/lib/modules/$KERNELRELEASE/build
>  $S$M   rm -f %{buildroot}/lib/modules/$KERNELRELEASE/source
>  $S$M   mkdir -p %{buildroot}/usr/src/kernels/$KERNELRELEASE
> --
> 2.34.1
>

This came from fc370ecfdb37b853bd8e2118c7ad9f99fa9ac5cd
I do not know how useful or annoying it is.
Presumably, it was a cheesy work, and rather annoying than useful.

In debian (scripts/package/mkdebian), this kind of stuff is
a separate debug package, and only built when CONFIG_DEBUG_INFO=y.

Take more time in case somebody may come up with a better idea.

--
Best Regards
Masahiro Yamada