[PATCH v8 18/35] selftests-dyndbg: exit 127 if no facility

[Jim Cromie]

Test if /proc/dynamic_debug/control exists, exit 127 otherwise.
This distinguishes an untestable config from both pass & fail.
The 127 choice is pretty arbitrary, but imitating bisect.

That control file's presense guarantees that dynamic-debugging is
configured (unless /proc is off, unusually), without dealing with the
<debugfs> mount.

Signed-off-by: Jim Cromie <jim.cromie@xxxxxxxxx>
---
 tools/testing/selftests/dynamic_debug/dyndbg_selftest.sh | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tools/testing/selftests/dynamic_debug/dyndbg_selftest.sh b/tools/testing/selftests/dynamic_debug/dyndbg_selftest.sh
index 1be70af26a38..cb77ae142520 100755
--- a/tools/testing/selftests/dynamic_debug/dyndbg_selftest.sh
+++ b/tools/testing/selftests/dynamic_debug/dyndbg_selftest.sh
@@ -11,6 +11,11 @@ CYAN="\033[0;36m"
 NC="\033[0;0m"
 error_msg=""
 
+[ -e /proc/dynamic_debug/control ] || {
+    echo -e "${RED}: kernel not configured for this test ${NC}"
+    exit 127
+}
+
 function vx () {
     echo $1 > /sys/module/dynamic_debug/parameters/verbose
 }
-- 
2.44.0