kbuild: verify that $DEPMOD is installed

Verify that 'depmod' ($DEPMOD) is installed.
This is a partial revert of commit 620c231c7a7f
("kbuild: do not check for ancient modutils tools").

Also update Documentation/process/changes.rst to refer to
kmod instead of module-init-tools.

Fixes kernel bugzilla #198965:
https://bugzilla.kernel.org/show_bug.cgi?id=198965

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Lucas De Marchi <lucas.demarchi@profusion.mobi>
Cc: Lucas De Marchi <lucas.de.marchi@gmail.com>
Cc: Michal Marek <michal.lkml@markovi.net>
Cc: Jessica Yu <jeyu@kernel.org>
Cc: Chih-Wei Huang <cwhuang@linux.org.tw>
Cc: stable@vger.kernel.org # any kernel since 2012
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

Documentation/process/changes.rst

@@ -35,7 +35,7 @@ binutils               2.20             ld -v
 flex                   2.5.35           flex --version
 bison                  2.0              bison --version
 util-linux             2.10o            fdformat --version
-module-init-tools      0.9.10           depmod -V
+kmod                   13               depmod -V
 e2fsprogs              1.41.4           e2fsck -V
 jfsutils               1.1.3            fsck.jfs -V
 reiserfsprogs          3.6.3            reiserfsck -V
@@ -156,12 +156,6 @@ is not build with ``CONFIG_KALLSYMS`` and you have no way to rebuild and
 reproduce the Oops with that option, then you can still decode that Oops
 with ksymoops.
 
-Module-Init-Tools
------------------
-
-A new module loader is now in the kernel that requires ``module-init-tools``
-to use.  It is backward compatible with the 2.4.x series kernels.
-
 Mkinitrd
 --------
 
@@ -371,16 +365,17 @@ Util-linux
 
 - <https://www.kernel.org/pub/linux/utils/util-linux/>
 
+Kmod
+----
+
+- <https://www.kernel.org/pub/linux/utils/kernel/kmod/>
+- <https://git.kernel.org/pub/scm/utils/kernel/kmod/kmod.git>
+
 Ksymoops
 --------
 
 - <https://www.kernel.org/pub/linux/utils/kernel/ksymoops/v2.4/>
 
-Module-Init-Tools
------------------
-
-- <https://www.kernel.org/pub/linux/utils/kernel/module-init-tools/>
-
 Mkinitrd
 --------
 

scripts/depmod.sh

@@ -10,10 +10,16 @@ fi
 DEPMOD=$1
 KERNELRELEASE=$2
 
-if ! test -r System.map -a -x "$DEPMOD"; then
+if ! test -r System.map ; then
 	exit 0
 fi
 
+if [ -z $(command -v $DEPMOD) ]; then
+	echo "'make modules_install' requires $DEPMOD. Please install it." >&2
+	echo "This is probably in the kmod package." >&2
+	exit 1
+fi
+
 # older versions of depmod require the version string to start with three
 # numbers, so we cheat with a symlink here
 depmod_hack_needed=true