devtools: enhance error message in get maintainer script

When the DPDK_GETMAINTAINER_PATH variable was not set, the error
message from get-maintainer.sh was quite cheap:

	$ devtools/get-maintainer.sh --help
	usage: get-maintainer.sh <patch>
	Cannot execute DPDK_GETMAINTAINER_PATH

Add a more detailed explanation about this variable in the help.

Signed-off-by: Olivier Matz <olivier.matz@6wind.com>
Acked-by: Ferruh Yigit <ferruh.yigit@intel.com>

diff --git a/devtools/get-maintainer.sh b/devtools/get-maintainer.sh
index 5ae6b5a..5a25913 100755 (executable)
--- a/devtools/get-maintainer.sh
+++ b/devtools/get-maintainer.sh
@@ -42,15 +42,16 @@ options="$options --no-rolestats"
 print_usage () {
        cat <<- END_OF_HELP
        usage: $(basename $0) <patch>
+
+       The DPDK_GETMAINTAINER_PATH variable should be set to the full path to
+       the get_maintainer.pl script located in Linux kernel sources. Example:
+       DPDK_GETMAINTAINER_PATH=~/linux/scripts/get_maintainer.pl
+
+       Also refer to devtools/load-devel-config to store your configuration.
        END_OF_HELP
 }
 
-# Requires DPDK_GETMAINTAINER_PATH devel config option set,
-# please check devtools/load-devel-config.
-# DPDK_GETMAINTAINER_PATH should be full path to the get_maintainer.pl script,
-# like:
-#   DPDK_GETMAINTAINER_PATH=~/linux/scripts/get_maintainer.pl
-
+# Requires DPDK_GETMAINTAINER_PATH devel config option set
 if [ ! -x "$DPDK_GETMAINTAINER_PATH" ] ; then
        print_usage >&2
        echo