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

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Message-ID: <Yy3uCtztO3uDgecE@dev-arch.thelio-3990X>
Date:   Fri, 23 Sep 2022 10:34:02 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Zack Rusin <zackr@...are.com>
Cc:     Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kbuild: Add an option to skip vmlinux.bz2 in the rpm's

On Thu, Sep 22, 2022 at 02:45:25PM -0400, Zack Rusin wrote:
> From: Zack Rusin <zackr@...are.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@...are.com>
> Cc: Masahiro Yamada <masahiroy@...nel.org>
> Cc: Michal Marek <michal.lkml@...kovi.net>
> Cc: Nick Desaulniers <ndesaulniers@...gle.com>
> Cc: linux-kbuild@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org

Yes please, this seems to slightly improve the time spent actually
building and installing the package.

Tested-by: Nathan Chancellor <nathan@...nel.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
> 
>