[Buildroot] [PATCH] Add kernel compression selection.

[Yann E. MORIN <yann.morin.1998@free.fr>]

Johan, Maxime, All,

On 2015-07-12 13:34 +0200, Maxime Hadjinlian spake thusly:
> From: Johan Sagaert <sagaert.johan@proximus.be>
> 
> This selection will ensure that the correct host tools
> will be build used for the kernel compression method used.
> 
> [Maxime: Select the compression opts in the kernel config too ]
> 
> Signed-off-by: Sagaert Johan <sagaert.johan@proximus.be>
> Signed-off-by: Maxime Hadjinlian <maxime.hadjinlian@gmail.com>

Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>

Regards,
Yann E. MORIN.

> ---
> V3->V4
> 	Add selection menu in the kernel menu section.
> 	This ensures only things needed are build.
> V2->V3
> 	Unconditionally build lz4.
> 	The building overhead is negligible.
> V1->V2
> 	Only add the host-lz4 dependency when ARM is selected.
> 	Don't touch host-lz4 package.
> ---
>  linux/Config.in | 28 ++++++++++++++++++++++++++++
>  linux/linux.mk  | 27 ++++++++++++++++++++++++++-
>  2 files changed, 54 insertions(+), 1 deletion(-)
> 
> diff --git a/linux/Config.in b/linux/Config.in
> index 8c86a1a..73ae0b9 100644
> --- a/linux/Config.in
> +++ b/linux/Config.in
> @@ -254,6 +254,34 @@ config BR2_LINUX_KERNEL_IMAGE_TARGET_CUSTOM
>  
>  endchoice
>  
> +#
> +# Kernel compression format
> +#
> +
> +choice
> +	prompt "Kernel compression format"
> +	help
> +	  This selection will just ensure that the correct host tools are build.
> +	  The actual compression for the kernel should be selected in the
> +	  kernel configuration menu.
> +
> +config BR2_LINUX_KERNEL_GZIP
> +	bool "gzip compression"
> +
> +config BR2_LINUX_KERNEL_LZ4
> +	bool "lz4 compression"
> +
> +config BR2_LINUX_KERNEL_LZMA
> +	bool "lzma compression"
> +
> +config BR2_LINUX_KERNEL_LZO
> +	bool "lzo compression"
> +
> +config BR2_LINUX_KERNEL_XZ
> +	bool "xz compression"
> +
> +endchoice
> +
>  config BR2_LINUX_KERNEL_IMAGE_TARGET_NAME
>  	string "Kernel image target name"
>  	depends on BR2_LINUX_KERNEL_IMAGE_TARGET_CUSTOM
> diff --git a/linux/linux.mk b/linux/linux.mk
> index eca1450..c710355 100644
> --- a/linux/linux.mk
> +++ b/linux/linux.mk
> @@ -56,7 +56,27 @@ LINUX_PATCHES = $(call qstrip,$(BR2_LINUX_KERNEL_PATCH))
>  LINUX_PATCH = $(filter ftp://% http://% https://%,$(LINUX_PATCHES))
>  
>  LINUX_INSTALL_IMAGES = YES
> -LINUX_DEPENDENCIES += host-kmod host-lzop
> +LINUX_DEPENDENCIES += host-kmod
> +
> +# host tools needed for kernel compression
> +ifeq ($(BR2_LINUX_KERNEL_LZ4),y)
> +LINUX_DEPENDENCIES += host-lz4
> +LINUX_COMPRESSION_OPTS = CONFIG_KERNEL_LZ4
> +else ifeq ($(BR2_LINUX_KERNEL_LZMA),y)
> +LINUX_DEPENDENCIES += host-lzma
> +LINUX_COMPRESSION_OPTS = CONFIG_KERNEL_LZMA
> +else ifeq ($(BR2_LINUX_KERNEL_LZO),y)
> +LINUX_DEPENDENCIES += host-lzop
> +LINUX_COMPRESSION_OPTS = CONFIG_KERNEL_LZO
> +else ifeq ($(BR2_LINUX_KERNEL_XZ),y)
> +LINUX_DEPENDENCIES += host-xz
> +LINUX_COMPRESSION_OPTS = CONFIG_KERNEL_XZ
> +endif
> +LINUX_COMPRESSION_OPT_$(BR2_LINUX_KERNEL_GZIP) = CONFIG_KERNEL_GZIP
> +LINUX_COMPRESSION_OPT_$(BR2_LINUX_KERNEL_LZ4) = CONFIG_KERNEL_LZ4
> +LINUX_COMPRESSION_OPT_$(BR2_LINUX_KERNEL_LZMA) = CONFIG_KERNEL_LZMA
> +LINUX_COMPRESSION_OPT_$(BR2_LINUX_KERNEL_LZO) = CONFIG_KERNEL_LZO
> +LINUX_COMPRESSION_OPT_$(BR2_LINUX_KERNEL_XZ) = CONFIG_KERNEL_XZ
>  
>  ifeq ($(BR2_LINUX_KERNEL_UBOOT_IMAGE),y)
>  LINUX_DEPENDENCIES += host-uboot-tools
> @@ -187,6 +207,11 @@ LINUX_KCONFIG_EDITORS = menuconfig xconfig gconfig nconfig
>  LINUX_KCONFIG_OPTS = $(LINUX_MAKE_FLAGS)
>  
>  define LINUX_KCONFIG_FIXUP_CMDS
> +	$(call KCONFIG_ENABLE_OPT,$(LINUX_COMPRESSION_OPT_y),$(@D)/.config)
> +	$(foreach opt, $(LINUX_COMPRESSION_OPT_),
> +		$(call KCONFIG_DISABLE_OPT,$(opt),$(@D)/.config)
> +	)
> +
>  	$(if $(BR2_arm)$(BR2_armeb),
>  		$(call KCONFIG_ENABLE_OPT,CONFIG_AEABI,$(@D)/.config))
>  	$(if $(BR2_TARGET_ROOTFS_CPIO),
> -- 
> 2.1.4
> 
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