From 80c91af608404aeb09e1d15b8afa4fb79a01faa8 Mon Sep 17 00:00:00 2001
From: Parth Pancholi <parth.pancholi@toradex.com>
Date: Thu, 14 Nov 2024 15:56:44 +0100
Subject: [PATCH] kbuild: switch from lz4c to lz4 for compression
commit e397a603e49cc7c7c113fad9f55a09637f290c34 upstream.
Replace lz4c with lz4 for kernel image compression.
Although lz4 and lz4c are functionally similar, lz4c has been deprecated
upstream since 2018. Since as early as Ubuntu 16.04 and Fedora 25, lz4
and lz4c have been packaged together, making it safe to update the
requirement from lz4c to lz4.
Consequently, some distributions and build systems, such as OpenEmbedded,
have fully transitioned to using lz4. OpenEmbedded core adopted this
change in commit fe167e082cbd ("bitbake.conf: require lz4 instead of
lz4c"), causing compatibility issues when building the mainline kernel
in the latest OpenEmbedded environment, as seen in the errors below.
This change also updates the LZ4 compression commands to make it backward
compatible by replacing stdin and stdout with the '-' option, due to some
unclear reason, the stdout keyword does not work for lz4 and '-' works for
both. In addition, this modifies the legacy '-c1' with '-9' which is also
compatible with both. This fixes the mainline kernel build failures with
the latest master OpenEmbedded builds associated with the mentioned
compatibility issues.
LZ4 arch/arm/boot/compressed/piggy_data
/bin/sh: 1: lz4c: not found
...
...
ERROR: oe_runmake failed
Link: https://github.com/lz4/lz4/pull/553
Suggested-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Signed-off-by: Parth Pancholi <parth.pancholi@toradex.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Cc: Salvatore Bonaccorso <carnil@debian.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
Makefile | 2 +-
scripts/Makefile.lib | 4 ++--
2 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/Makefile b/Makefile
index 9e6246e733eb9..96718830200d4 100644
--- a/Makefile
+++ b/Makefile
@@ -509,7 +509,7 @@ KGZIP = gzip
KBZIP2 = bzip2
KLZOP = lzop
LZMA = lzma
-LZ4 = lz4c
+LZ4 = lz4
XZ = xz
ZSTD = zstd
diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index 01a9f567d5af4..fe5e132fcea89 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -371,10 +371,10 @@ quiet_cmd_lzo_with_size = LZO $@
cmd_lzo_with_size = { cat $(real-prereqs) | $(KLZOP) -9; $(size_append); } > $@
quiet_cmd_lz4 = LZ4 $@
- cmd_lz4 = cat $(real-prereqs) | $(LZ4) -l -c1 stdin stdout > $@
+ cmd_lz4 = cat $(real-prereqs) | $(LZ4) -l -9 - - > $@
quiet_cmd_lz4_with_size = LZ4 $@
- cmd_lz4_with_size = { cat $(real-prereqs) | $(LZ4) -l -c1 stdin stdout; \
+ cmd_lz4_with_size = { cat $(real-prereqs) | $(LZ4) -l -9 - -; \
$(size_append); } > $@
# U-Boot mkimage
--
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