linux-kernel - Re: make cloneconfig ?

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Date:	Thu, 24 Apr 2008 09:00:52 +0200
From:	devzero@....de
To:	Jesper Juhl <jesper.juhl@...il.com>
Cc:	agruen@...e.de, linux-kernel@...r.kernel.org
Subject: Re: make cloneconfig ?

> Isn't "cloneconfig" basically just "zcat /proc/config.gz > .config &&
> make oldconfig" ???  

yes (see below)

> If so, why do we need yet another "make
> <some_target>" Makefile rule? What would actually be gained?

ease of use and less confused users of suse-kernel based distro`s.
i have seen people giving hints for kernel compilation and telling "just do make cloneconfig" to non-suse users, just because they didn`t know, that this is suse specific.

ok, that`s not a real reason because you could argue that suse should drop it for more consistent end-user experience, but i think it`s much easier (and hassle free) to add it to mainline than drop it from suse. 

roland

List:       linux-kernel
Subject:    [kbuild 3/5] Add cloneconfig target
From:       Andreas Gruenbacher <agruen () suse ! de>
Date:       2005-01-18 18:41:23
Message-ID: 20050118192608.500213000.suse.de
[Download message RAW]

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>

Index: linux-2.6.11-rc1-bk6/scripts/kconfig/Makefile
===================================================================
--- linux-2.6.11-rc1-bk6.orig/scripts/kconfig/Makefile
+++ linux-2.6.11-rc1-bk6/scripts/kconfig/Makefile
@@ -37,6 +37,22 @@ allnoconfig: $(obj)/conf
 allmodconfig: $(obj)/conf
 	$< -m arch/$(ARCH)/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/$(ARCH)/Kconfig
+
 defconfig: $(obj)/conf
 ifeq ($(KBUILD_DEFCONFIG),)
 	$< -d arch/$(ARCH)/Kconfig

--
Andreas Gruenbacher <agruen@...e.de>
SUSE Labs, SUSE LINUX PRODUCTS GMBH

> -----Ursprüngliche Nachricht-----
> Von: "Jesper Juhl" <jesper.juhl@...il.com>
> Gesendet: 24.04.08 00:43:56
> An: "devzero@....de" <devzero@....de>
> CC: linux-kernel@...r.kernel.org, agruen@...e.de
> Betreff: Re: make cloneconfig ?

> On 24/04/2008, devzero@....de <devzero@....de> wrote:
> > any reason why "make cloneconfig" never made it into mainline?
> >
> >  many people are quite used to it and every time i build vanilla kernel i step into that trap  "oh - that`s a suse`ism"
> >
> >  make cloneconfig exists since /proc/config.gz - but while that one went into mainline, cloneconfig never did.
> >
> >  anyone know the reason for that ?
> >
> >  i wished, distros kernels were more similar to vanilla kernels - so what about making them more similar ?
> >
> >
> 
> Isn't "cloneconfig" basically just "zcat /proc/config.gz > .config &&
> make oldconfig" ???   If so, why do we need yet another "make
> <some_target>" Makefile rule? What would actually be gained?
> 
> -- 
> Jesper Juhl <jesper.juhl@...il.com>
> Don't top-post  http://www.catb.org/~esr/jargon/html/T/top-post.html
> Plain text mails only, please      http://www.expita.com/nomime.html
> 

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