linux-kernel - Re: [PATCH v3 -next 5/5] Kconfig: Make x86 and arm kernels default to the LZ4-compressed

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Message-ID: <51371320.6000002@openwrt.org>
Date:	Wed, 06 Mar 2013 10:57:52 +0100
From:	Florian Fainelli <florian@...nwrt.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Kyungsik Lee <kyungsik.lee@....com>,
	Russell King <linux@....linux.org.uk>,
	"H. Peter Anvin" <hpa@...or.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-kbuild@...r.kernel.org, x86@...nel.org,
	celinux-dev@...ts.celinuxforum.org,
	Nicolas Pitre <nico@...xnic.net>,
	David Sterba <dsterba@...e.cz>,
	Nitin Gupta <nitingupta910@...il.com>,
	Joe Millenbach <jmillenbach@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Michal Marek <mmarek@...e.cz>, hyojun.im@....com,
	chan.jeong@....com, raphael.andy.lee@...il.com
Subject: Re: [PATCH v3 -next 5/5] Kconfig: Make x86 and arm kernels default
 to the LZ4-compressed

On 03/06/2013 12:08 AM, Andrew Morton wrote:
> On Tue, 05 Mar 2013 13:04:20 +0100 Florian Fainelli <florian@...nwrt.org> wrote:
>
>> Hello,
>>
>> On 03/05/2013 12:47 PM, Kyungsik Lee wrote:
>>> This patch makes x86 and arm kernels default to the LZ4-compressed
>>> to test new LZ4 code in the linux-next. This is requested by
>>> Andrew Morton.
>>
>> I do not think making this the default is good idea, because the lz4demo
>> utility that you need to actually compress the kernel (used in patch 2)
>> is not installed nor available by default on most systems, while gzip
>> is.
>
> Yes, that's a showstopper even for linux-next.  What a shame.
>
> It means this code will walk into mainline with practically zero
> third-party testing.  Oh well, the risk is minor.  If it breaks, people
> can switch back to gzip easily enough.

If we want to have more coverage, how about importing the lz4demo 
utility source code to tools/lz4/, and change scripts/Makefile.lib to 
point at it? Once the lz4 utilities have reached a broader audience and 
are available with most distributions, we could revert back to assuming 
this utility can be found in PATH.
--
Florian
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