Don't clean kernel_module by default to save some nanoseconds

README.adoc

@@ -2766,6 +2766,15 @@ dmesg -T
 sudo lsmod | grep hello
 ....
 
+Once you are done with this method, you must clean up the in-tree build objects before you decide to do the right thing and move on to the superior `./build` Buildroot method:
+
+....
+cd "kernel_module"
+./make-host.sh clean
+....
+
+otherwise they will cause problems.
+
 === Hello host
 
 Minimal host build system sanity check example.

build

@@ -136,8 +136,6 @@ BR2_ROOTFS_POST_SCRIPT_ARGS=\"$post_script_args\"
   make O="$out_dir" olddefconfig
 fi
 
-cd "${root_dir}/kernel_module"
-./make-host.sh -j "$j" clean
 mkdir -p "${root_dir}/9p"
 cd "${buildroot_dir}"
 # HOST_QEMU_OPTS is a hack that happens to work because the QEMU package luckly uses += at all times.