----

-title: Config-brainstorming

----

-

-Brainstorming for enable Kconfig on compat-drivers

-

-<h1>Step 1</h1>

-

-Using the existing kernel's config, generate a Kconfig file that contains all the right symbols for that kernel:

-

-<code>

-<pre>

-cat .config | genkconf.sh > kernel-kconfig

-</pre>

-</code>

-

-where the script is this:

-

-<code>

-<pre>

-#!/bin/bash

-

-while read line ; do

- case "${line:0:7}" in

- "CONFIG_")

- line="${line:7}"

- cfg="${line%%=*}"

- val="${line#*=}"

- cfgtype="skip"

- if [ "$val" = "m" ] ; then

- cfgtype="tristate"

- elif [ "$val" = "y" ] ; then

- cfgtype="bool"

- fi

- if [ "$cfgtype" != "skip" ] ; then

- echo "config $cfg"

- echo " $cfgtype"

- echo " default $val"

- echo ""

- fi

- ;;

- "# CONFI")

- cfg="${line:9}"

- cfg="${cfg%% is not set}"

- echo "config $cfg"

- echo " bool"

- echo " default n"

- echo ""

- ;;

- esac

-done

-</pre>

-</code>

-

-<h1>Step 2</h1>

-

-Collect all Kconfig symbols from compat:

-<code>

-<pre>

-find . -name Kconfig | xargs cat | sed 's/^config //;t;d' > symbols

-</pre>

-</code>

-

-<h1>Step 3</h1>

-

-Instead of patching Makefiles, replaces all CONFIG_ by CONFIG_COMPAT_ in all Makefiles:

-

-<code><pre>

-find . -name Makefile | xargs rpl "CONFIG_" "CONFIG_COMPAT_"

-</pre></code>

-

-This means that only things that are actually selected in compat will be built.

-

-<h1>Step 4</h1>

-

-Replace all "FOO" with "COMPAT_FOO" symbols in Kconfig and code files:

-

-<code><pre>

-for sym in $(cat symbols) ; do

- find . -name Kconfig |\

- xargs rpl -w "$sym" "COMPAT_$sym"

-

- find . -name '*.c' -o -name '*.h' |\

- xargs rpl -w "CONFIG_$sym" "CONFIG_COMPAT_$sym"

-done

-</pre></code>

-

-<h1>Step 5</h1>

-

-Build a Kconfig file:

-

-<code><pre>

-echo 'source "kernel-kconfig"' > Kconfig

-for k in drivers/net/wireless/*/Kconfig ; do echo "source \"$k\"" >> Kconfig ; done

-</pre></code>

-

-etc. Currently, mac80211/cfg80211/... Kconfig isn't copied. They will need to be copied and potentially modified for dependencies like WEXT.

-

-<h1>Step 6</h1>

-Run menuconfig:

-

-<code><pre>

-/lib/modules/$(uname -r)/build/scripts/kconfig/mconf Kconfig

-</pre></code>

-

-<h1>Step 7</h1>

-

-Build the thing.

-

-The generated .config can be parsed with either the existing compat-drivers/scripts/gen-compat-autoconf.sh script or scripts/kconfig/confdata.c (conf --silentoldconfig). The generated include/linux/compat_autoconf.h is already included as part of the build of compat-drivers. \ No newline at end of file