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[Lzip-bug] Lzip patch for linux 5.10.25 released

From: Antonio Diaz Diaz
Subject: [Lzip-bug] Lzip patch for linux 5.10.25 released
Date: Tue, 20 Apr 2021 17:31:51 +0200
User-agent: Mozilla/5.0 (X11; U; Linux i586; en-US; rv: Gecko/20110420 SeaMonkey/2.0.14

I am pleased to announce the release of the lzip patch for linux 5.10.25.

Since 2016 I maintain a patch adding lzip decompression support to the linux kernel. This includes support for lzip-compressed kernel image, initramfs, initrd, modules, and squashfs filesystems. The patch implements a linux module named lzip_decompress.

Decompression time is usually a small fraction of the total boot time. Therefore it is not worth using a faster but weaker algorithm just to save a fraction of a second from a total boot time of, say, 20 seconds.

Lzip related components in the kernel

The lzip_decompress module in lib/lzip_decompress.c provides a versatile lzip decompression function able to do buffer to buffer decompression or stream decompression with fill and flush callback functions. The usage of the function is documented in include/linux/lzip.h.

For decompressing the kernel image, initramfs, and initrd, there is a wrapper function in lib/decompress_lunzip.c providing the same common interface as the other decompress_*.c files, which is defined in include/linux/decompress/generic.h.

For kernel makefiles, two commands are provided in scripts/Makefile.lib for use with $(call if_changed). The kernel image must be compressed with $(call if_changed,klzip) which will append a four-byte trailer containing the size of the uncompressed data, which is needed by the boot code. Other things should be compressed with $(call if_changed,lzip).


Xlunzip is a test tool for the lzip_decompress module. It is similar to lunzip, but it uses the lzip_decompress module as a backend. The xlunzip tarball contains a copy of the lzip_decompress module and can be compiled and tested without downloading or applying the patch to the kernel. The homepage of xlunzip is at http://www.nongnu.org/lzip/xlunzip.html

The patch can be downloaded from

The sha256sum is:
c0e76e054adad5bb82a30d72ddaad9e785fdeb8ea4945f1c8e1630da1a9ee004 linux-5.10.25_lzip-1.diff.lz

Please, test it and report any bugs you find.

Antonio Diaz, lzip author and maintainer.

If you care about data safety and long-term archiving, please consider using lzip. See http://www.nongnu.org/lzip/lzip_benchmark.html
http://www.nongnu.org/lzip/manual/lzip_manual.html#Quality-assurance and
http://www.nongnu.org/lzip/safety_of_the_lzip_format.html Thanks.

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