"make clean/mrproper/distclean" has not been working correctly.
When "make clean" is run, Kbuild descends into the directories
that are listed in "clean-dirs" variable, which includes $(srctree).
It intends descending into "./Kbuild", not "./Makefile".
(Note "Kbuild" takes precedence over "Makefile" in each directory.)
If Kbuild descends into "./Makefile", Kconfig is invoked via
"make silentoldconfig", which is not our intention.
Let's add "Kbuild" file at the top directory like Linux.
Update TODO list too.
Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Masahiro Yamada