kbuild: modules_install: warn when missing System.map file

rddunlap · masahir0y · commit f0b0d88a8251 · 2018-09-09T09:14:07.000+09:00
If there is no System.map file for "make modules_install",
scripts/depmod.sh will silently exit with success, having done
nothing.  Since this is an unexpected situation, change it to
report a Warning for the missing file.  The behavior is not
changed except for the Warning message.

The (previous) silent success and new Warning can be reproduced
by:
$ make mrproper; make defconfig
$ make modules; make modules_install

and since System.map is produced by "make vmlinux", the steps
above omit producing the System.map file.

Reported-by: Masahiro Yamada &lt;yamada.masahiro@socionext.com&gt;
Signed-off-by: Randy Dunlap &lt;rdunlap@infradead.org&gt;
Signed-off-by: Masahiro Yamada &lt;yamada.masahiro@socionext.com&gt;
diff --git a/scripts/depmod.sh b/scripts/depmod.sh
@@ -11,6 +11,7 @@ DEPMOD=$1
 KERNELRELEASE=$2
 
 if ! test -r System.map ; then
+	echo "Warning: modules_install: missing 'System.map' file. Skipping depmod." >&2
 	exit 0
 fi
 
