6.6-stable review patch. If anyone has any objections, please let me know.
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From: Parth Pancholi parth.pancholi@toradex.com
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(-)
--- a/Makefile +++ b/Makefile @@ -518,7 +518,7 @@ KGZIP = gzip KBZIP2 = bzip2 KLZOP = lzop LZMA = lzma -LZ4 = lz4c +LZ4 = lz4 XZ = xz ZSTD = zstd
--- a/scripts/Makefile.lib +++ b/scripts/Makefile.lib @@ -472,10 +472,10 @@ 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