linux-kernel - Re: [PATCH] Add ``cloneconfig'' target

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Message-ID: <20110225060706.GA12723@merkur.ravnborg.org>
Date:	Fri, 25 Feb 2011 07:07:06 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	Jeff Mahoney <jeffm@...e.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Roman Zippel <zippel@...ux-m68k.org>,
	linux-kbuild@...r.kernel.org
Subject: Re: [PATCH] Add ``cloneconfig'' target

On Thu, Feb 24, 2011 at 09:35:02PM -0500, Jeff Mahoney wrote:
> Cloneconfig takes the first configuration it finds which appears
> to belong to the running kernel, and configures the kernel sources
> to match this configuration as closely as possible.
> 
> Signed-off-by: Andreas Gruenbacher <agruen@...e.de>
> Signed-off-by: Jeff Mahoney <jeffm@...e.com>
> ---
>  scripts/kconfig/Makefile |   17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
> 
> --- a/scripts/kconfig/Makefile
> +++ b/scripts/kconfig/Makefile
> @@ -99,6 +99,23 @@ PHONY += allnoconfig allyesconfig allmod
>  
>  allnoconfig allyesconfig allmodconfig alldefconfig randconfig: $(obj)/conf
>  	$< --$@ $(Kconfig)
> + 
> +UNAME_RELEASE := $(shell uname -r)
> +CLONECONFIG := $(firstword $(wildcard /proc/config.gz \
> +				      /lib/modules/$(UNAME_RELEASE)/.config \
> +				      /etc/kernel-config \
> +				      /boot/config-$(UNAME_RELEASE)))
> +cloneconfig: $(obj)/conf
> +	$(Q)case "$(CLONECONFIG)" in				\
> +	'')	echo -e "The configuration of the running"	\
> +			"kernel could not be determined\n";	\
> +		false ;;					\
> +	*.gz)	gzip -cd $(CLONECONFIG) > .config.running ;;	\
> +	*)	cat $(CLONECONFIG) > .config.running ;;		\
> +	esac &&							\
> +	echo -e "Cloning configuration file $(CLONECONFIG)\n"
> +	$(Q)$< -D .config.running arch/$(SRCARCH)/Kconfig
> +

We already have something remotely similar in kconfig.
We use the following list:
config DEFCONFIG_LIST
        string
        depends on !UML
        option defconfig_list
        default "/lib/modules/$UNAME_RELEASE/.config"
        default "/etc/kernel-config"
        default "/boot/config-$UNAME_RELEASE"
        default "$ARCH_DEFCONFIG"
        default "arch/$ARCH/defconfig"

It would be better to teach kconfig to read /proc/config.gz
and then add it to the list above.

This list is used if you just type "make enuconfig" without
any configuration.

	Sam
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