scripts/gen_initramfs_list.sh: fix flags for initramfs LZ4 compression
LZ4 as implemented in the kernel differs from the default method now
used by the reference implementation of LZ4. Until the in-kernel method
is updated to support the new default, passing the legacy flag (-l) to
the compressor is necessary. Without this flag the kernel-generated,
LZ4-compressed initramfs is junk.
Kyungsik said:
: It seems that lz4 supports legacy format with the same option as lz4c
: does. Just looking at the first few bytes of lz4 compressed image, we can
: see whether it is new format or not.
:
: It shows new format magic number without this patch. New format magic
: number is 0x184d2204.
:
: $ hexdump -C ./initramfs_data.cpio.lz4 |more
: 00000000 04 22 4d 18 64 70 b9 69 (Little Endian)
: ...
:
: Currently kernel supports legacy format only.
Signed-off-by: Daniel M. Weeks <dan@danweeks.net>
Cc: Michal Marek <mmarek@suse.cz>
Acked-by: Kyungsik Lee <kyungsik.lee@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/scripts/gen_initramfs_list.sh b/scripts/gen_initramfs_list.sh
index ef47409..17fa901 100644
--- a/scripts/gen_initramfs_list.sh
+++ b/scripts/gen_initramfs_list.sh
@@ -257,7 +257,7 @@
&& compr="lzop -9 -f"
echo "$output_file" | grep -q "\.lz4$" \
&& [ -x "`which lz4 2> /dev/null`" ] \
- && compr="lz4 -9 -f"
+ && compr="lz4 -l -9 -f"
echo "$output_file" | grep -q "\.cpio$" && compr="cat"
shift
;;