linux-kernel - Re: [PATCH] Add option to disable kernel compression

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Date:	Thu, 11 Apr 2013 13:08:08 +0530
From:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:	Christian Ruppert <christian.ruppert@...lis.com>
CC:	<linux-kernel@...r.kernel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	"David S. Miller" <davem@...emloft.net>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Vineet Gupta <Vineet.Gupta1@...opsys.com>,
	Noam Camus <noamc@...hip.com>,
	pierrick hascoet <pierrick.hascoet@...lis.com>
Subject: Re: [PATCH] Add option to disable kernel compression

On 04/09/2013 05:19 PM, Christian Ruppert wrote:
> Until now, kernel compression can only be disabled by deselecting
> HAVE_<compression> in the architecture Kconfig. However, some
> users/platforms within the same architecture might want to use
> compression while others might want to disable it.
> This patch is a solution to the dilemma.
>
> Signed-off-by: Christian Ruppert <christian.ruppert@...lis.com>
> ---
>  init/Kconfig |    8 +++++++-
>  1 files changed, 7 insertions(+), 1 deletions(-)
>
> diff --git a/init/Kconfig b/init/Kconfig
> index 5341d72..0924c51 100644
> --- a/init/Kconfig
> +++ b/init/Kconfig
> @@ -101,7 +101,6 @@ config HAVE_KERNEL_LZO
>  choice
>  	prompt "Kernel compression mode"
>  	default KERNEL_GZIP
> -	depends on HAVE_KERNEL_GZIP || HAVE_KERNEL_BZIP2 || HAVE_KERNEL_LZMA || HAVE_KERNEL_XZ || HAVE_KERNEL_LZO
>  	help
>  	  The linux kernel is a kind of self-extracting executable.
>  	  Several compression algorithms are available, which differ
> @@ -120,6 +119,13 @@ choice
>  
>  	  If in doubt, select 'gzip'
>  
> +config KERNEL_UNCOMPRESSED
> +	bool "No compression"

> +	help
> +	  No compression at all. The kernel is huge but the compression and
> +	  decompression times are zero.
> +	  This is usually not what you want.
> +
>  config KERNEL_GZIP
>  	bool "Gzip"
>  	depends on HAVE_KERNEL_GZIP

FWIW, this is an issue for ARC port where one of our platforms runs on a very slow
FPGA, hence doesn't want to spend time uncompressing the image - while others do
want the gzip.

Reviewed-by: Vineet Gupta <vgupta@...opsys.com>

Thx,
-Vineet
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