Config-brainstorming
Brainstorming for enable Kconfig on compat-drivers
Contents |
Step 1
Using the existing kernel's config, generate a Kconfig file that contains all the right symbols for that kernel:
cat .config | genkconf.sh > kernel-kconfig
where the script is this:
#!/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
Step 2
Collect all Kconfig symbols from compat:
find . -name Kconfig | xargs cat | sed 's/^config //;t;d' > symbols
Step 3
Instead of patching Makefiles, replaces all CONFIG_ by CONFIG_COMPAT_ in all Makefiles:
find . -name Makefile | xargs rpl "CONFIG_" "CONFIG_COMPAT_"
This means that only things that are actually selected in compat will be built.
Step 4
Replace all "FOO" with "COMPAT_FOO" symbols in Kconfig and code files:
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_$sym"
done
Step 5
Build a Kconfig file:
echo 'source "kernel-kconfig"' > Kconfig
for k in drivers/net/wireless/*/Kconfig ; do echo "source \"$k\"" >> Kconfig ; done
etc. Currently, mac80211/cfg80211/... Kconfig isn't copied. They will need to be copied and potentially modified for dependencies like WEXT.
Step 6
Run menuconfig:
/lib/modules/$(uname -r)/build/scripts/kconfig/mconf Kconfig
Step 7
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.