1 files changed, 109 insertions, 0 deletions
diff --git a/source/config-brainstorming.rst b/source/config-brainstorming.rst
new file mode 100644
index 0000000..6ce2c77
--- /dev/null
+++ b/source/config-brainstorming.rst
@@ -0,0 +1,109 @@
+Config brainstorming
+====================
+
+Brainstorming for enable Kconfig on compat-drivers
+
+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:
+
+.. code-block:: bash
+
+   #!/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:
+
+.. code-block:: bash
+
+   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.