From: SeongJae Park <sj@xxxxxxxxxx>
Subject: selftests/damon: test DAMON enabling with empty target_ids case
DAMON debugfs didn't check empty targets when starting monitoring, and the
issue is fixed with commit b5ca3e83ddb0 ("mm/damon/dbgfs: add
adaptive_targets list check before enable monitor_on"). To avoid future
regression, this commit adds a test case for that in DAMON selftests.
Link: https://lkml.kernel.org/r/20211201150440.1088-9-sj@xxxxxxxxxx
Signed-off-by: SeongJae Park <sj@xxxxxxxxxx>
Cc: Brendan Higgins <brendanhiggins@xxxxxxxxxx>
Cc: Shuah Khan <shuah@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
tools/testing/selftests/damon/debugfs_attrs.sh | 9 +++++++++
1 file changed, 9 insertions(+)
--- a/tools/testing/selftests/damon/debugfs_attrs.sh~selftests-damon-test-damon-enabling-with-empty-target_ids-case
+++ a/tools/testing/selftests/damon/debugfs_attrs.sh
@@ -94,4 +94,13 @@ test_write_succ "$file" "" "$orig_conten
test_content "$file" "$orig_content" "" "empty input written"
echo "$orig_content" > "$file"
+# Test empty targets case
+# =======================
+
+orig_target_ids=$(cat "$DBGFS/target_ids")
+echo "" > "$DBGFS/target_ids"
+orig_monitor_on=$(cat "$DBGFS/monitor_on")
+test_write_fail "$DBGFS/monitor_on" "on" "orig_monitor_on" "empty target ids"
+echo "$orig_target_ids" > "$DBGFS/target_ids"
+
echo "PASS"
_
