linux-kernel - Re: [PATCH] initramfs: allow again choice of the embedded compression algorithm

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Message-ID: <alpine.LFD.2.10.1409291328290.15448@wniryva.cad.erqung.pbz>
Date:	Mon, 29 Sep 2014 13:38:32 +0530 (IST)
From:	P J P <ppandit@...hat.com>
To:	klondike <klondike@...cosoft.sinip.es>
cc:	linux-kernel@...r.kernel.org, Paul Bolle <pebolle@...cali.nl>
Subject: Re: [PATCH] initramfs: allow again choice of the embedded compression
 algorithm

   Hello Klondike,

+-- On Thu, 25 Sep 2014, klondike wrote --+
| Despite embedding an uncompressed initramfs, a user may want to allow for a
| compressed extra initramfs to be passed using the rd system, for example to
| boot a recovery system. Commit 9ba4bcb645898d562498ea66a0df958ef0e7a68c
| ("initramfs: read CONFIG_RD_ variables for initramfs compression") broke
| that behavior by making the choice based on CONFIG_RD_* instead of adding
| CONFIG_INITRAMFS_COMPRESSION_LZ4. Saddly, CONFIG_RD_* is also used to
| choose the supported RD compression algorithms by the kernel and a user may
| want to suppport more than one.

  Ie. on embedded systems they use CONFIG_INITRAMFS_COMPRESSION_* options to 
compress ram disk and on other platforms they use CONFIG_RD_* options?
 
| As a result the following options are added or readed affecting the embedded
| initramfs compression:
| INITRAMFS_COMPRESSION_NONE Do no compression
| INITRAMFS_COMPRESSION_GZIP Compress using gzip
| INITRAMFS_COMPRESSION_BZIP2 Compress using bzip2
| INITRAMFS_COMPRESSION_LZMA Compress using lzma
| INITRAMFS_COMPRESSION_XZ Compress using xz
| INITRAMFS_COMPRESSION_LZO Compress using lzo
| INITRAMFS_COMPRESSION_LZ4 Compress using lz4

  I haven't tested the patch yet, but does it preserve the CONFIG_RD_* 
options' functionality?

Would unifying the two options into one be a good idea?
--
 - P J P
47AF CE69 3A90 54AA 9045 1053 DD13 3D32 FE5B 041F
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