linux-kernel - Re: [PATCH] [FIX] init/Kconfig: fix option to disable kernel compression

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Date:	Sat, 16 Nov 2013 15:12:56 +0530
From:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:	Christian Ruppert <christian.ruppert@...lis.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Pavel Roskin <proski@....org>, Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Sam Ravnborg <sam@...nborg.org>, Noam Camus <noamc@...hip.com>,
	Joe Perches <joe@...ches.com>
Subject: Re: [PATCH] [FIX] init/Kconfig: fix option to disable kernel compression

On 11/15/2013 10:21 PM, Christian Ruppert wrote:
> Some architectures with self-decompressing kernel images did not compile
> with commit 69f0554ec261fd686ac7fa1c598cc9eb27b83a80 because they don't
> provide a non-decompression mechanism for uncompressed kernels.
> 
> Rectify this problem by allowing uncompressed kernels only for architectures
> which explicitly state they support them.
> 
> Signed-off-by: Christian Ruppert <christian.ruppert@...lis.com>


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

> ---
>  arch/arc/Kconfig | 2 ++
>  init/Kconfig     | 5 +++++
>  2 files changed, 7 insertions(+)
> 
> diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
> index 2ee0c9b..15f4c3d 100644
> --- a/arch/arc/Kconfig
> +++ b/arch/arc/Kconfig
> @@ -21,6 +21,8 @@ config ARC
>  	select HAVE_ARCH_KGDB
>  	select HAVE_ARCH_TRACEHOOK
>  	select HAVE_IOREMAP_PROT
> +	select HAVE_KERNEL_UNCOMPRESSED
> +	select HAVE_KERNEL_GZIP
>  	select HAVE_KPROBES
>  	select HAVE_KRETPROBES
>  	select HAVE_MEMBLOCK
> diff --git a/init/Kconfig b/init/Kconfig
> index 5496f30..d4baf2e 100644
> --- a/init/Kconfig
> +++ b/init/Kconfig
> @@ -97,6 +97,9 @@ config LOCALVERSION_AUTO
>  
>  	  which is done within the script "scripts/setlocalversion".)
>  
> +config HAVE_KERNEL_UNCOMPRESSED
> +        bool
> +
>  config HAVE_KERNEL_GZIP
>  	bool
>  
> @@ -118,6 +121,7 @@ config HAVE_KERNEL_LZ4
>  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 || HAVE_KERNEL_LZ4 || HAVE_KERNEL_UNCOMPRESSED
>  	help
>  	  The linux kernel is a kind of self-extracting executable.
>  	  Several compression algorithms are available, which differ
> @@ -138,6 +142,7 @@ choice
>  
>  config KERNEL_UNCOMPRESSED
>  	bool "No compression"
> +	depends on HAVE_KERNEL_UNCOMPRESSED
>  	help
>  	  No compression at all. The kernel is huge but the compression and
>  	  decompression times are zero.
> 

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