Hi Masahiro. Thanks for picking this up. > A key point is, the parent Makefile knows whether built-in.o is needed > or not. If a subdirectory needs to create built-in.o, its parent can > tell the fact when Kbuild descends into it. Good observation! > > diff --git a/Makefile b/Makefile > index 008a4e5..cc0b618 100644 > --- a/Makefile > +++ b/Makefile > @@ -1003,7 +1003,7 @@ $(sort $(vmlinux-deps)): $(vmlinux-dirs) ; > > PHONY += $(vmlinux-dirs) > $(vmlinux-dirs): prepare scripts > - $(Q)$(MAKE) $(build)=$@ > + $(Q)$(MAKE) $(build)=$@ need-builtin=1 The need-bultin may also be required for the shortcuts that allows one to use: make <dir>/ example: make net/ And maybe selftest, documentation shortcuts too? Other than that - looks good. Reviewed-by: Sam Ravnborg <sam@xxxxxxxxxxxx> Sam -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html