linux-kernel - Re: [PATCH 1/2] kbuild: Enable decompression for use by EXTRA_FIRMWARE The build system can currently only compress files. This patch adds the functionality to decompress files. Decompression is needed for building firmware files into the kernel if those files are compressed on the filesystem. Compressed firmware files are in use by Gentoo, Fedora, Arch, and others.

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Date: Tue, 2 Jan 2024 07:46:02 +0100
From: Nicolas Schier <n.schier@....de>
To: Kevin Martin <kevinmbecause@...il.com>
Cc: joeyzerocrash@...tonmail.com, Masahiro Yamada <masahiroy@...nel.org>,
	Nathan Chancellor <nathan@...nel.org>,
	Nick Desaulniers <ndesaulniers@...gle.com>,
	Nicolas Schier <nicolas@...sle.eu>, linux-kbuild@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] kbuild: Enable decompression for use by
 EXTRA_FIRMWARE The build system can currently only compress files. This
 patch adds the functionality to decompress files. Decompression is needed
 for building firmware files into the kernel if those files are compressed on
 the filesystem. Compressed firmware files are in use by Gentoo, Fedora,
 Arch, and others.

Hi Kevin,

> Subject: Re: [PATCH 1/2] kbuild: Enable decompression for use by
>  EXTRA_FIRMWARE The build system can currently only compress files. This
>  patch adds the functionality to decompress files. Decompression is needed
>  for building firmware files into the kernel if those files are compressed on
>  the filesystem. Compressed firmware files are in use by Gentoo, Fedora,
>  Arch, and others.

patch description is squashed into the subject.  Did your tooling
accidentially remove the empty line between?

The patch itself looks good to me.

Tested-by: Nicolas Schier <n.schier@....de>

Kind regards,
Nicolas

On Wed, Dec 20, 2023 at 05:22:50AM -0500, Kevin Martin wrote:
> Signed-off-by: Kevin Martin <kevinmbecause@...il.com>
> ---
>  scripts/Makefile.lib | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
> index 1a965fe68..d043be3dc 100644
> --- a/scripts/Makefile.lib
> +++ b/scripts/Makefile.lib
> @@ -523,6 +523,9 @@ quiet_cmd_xzkern_with_size = XZKERN  $@
>  quiet_cmd_xzmisc = XZMISC  $@
>        cmd_xzmisc = cat $(real-prereqs) | $(XZ) --check=crc32 --lzma2=dict=1MiB > $@
>  
> +quiet_cmd_xzdec = XZDEC   $@
> +      cmd_xzdec = cat $(real-prereqs) | $(XZ) --decompress > $@
> +
>  # ZSTD
>  # ---------------------------------------------------------------------------
>  # Appends the uncompressed size of the data using size_append. The .zst
> @@ -548,6 +551,9 @@ quiet_cmd_zstd22 = ZSTD22  $@
>  quiet_cmd_zstd22_with_size = ZSTD22  $@
>        cmd_zstd22_with_size = { cat $(real-prereqs) | $(ZSTD) -22 --ultra; $(size_append); } > $@
>  
> +quiet_cmd_zstddec = ZSTDDEC $@
> +      cmd_zstddec = cat $(real-prereqs) | $(ZSTD) --decompress > $@
> +
>  # ASM offsets
>  # ---------------------------------------------------------------------------
>  
> -- 
> 2.41.0
>