selftests/damon: add 'schemes' debugfs tests

This adds simple selftets for 'schemes' debugfs file of DAMON.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: SeongJae Park <[email protected]>
Cc: Amit Shah <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: David Hildenbrand <[email protected]>
Cc: David Rienjes <[email protected]>
Cc: David Woodhouse <[email protected]>
Cc: Greg Thelen <[email protected]>
Cc: Jonathan Cameron <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: Leonard Foerster <[email protected]>
Cc: Marco Elver <[email protected]>
Cc: Markus Boehme <[email protected]>
Cc: Shakeel Butt <[email protected]>
Cc: Shuah Khan <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

tools/testing/selftests/damon/debugfs_attrs.sh

@@ -57,6 +57,19 @@ test_write_fail "$file" "1 2 3 5 4" "$orig_content" \
 test_content "$file" "$orig_content" "1 2 3 4 5" "successfully written"
 echo "$orig_content" > "$file"
 
+# Test schemes file
+# =================
+
+file="$DBGFS/schemes"
+orig_content=$(cat "$file")
+
+test_write_succ "$file" "1 2 3 4 5 6 4" \
+	"$orig_content" "valid input"
+test_write_fail "$file" "1 2
+3 4 5 6 3" "$orig_content" "multi lines"
+test_write_succ "$file" "" "$orig_content" "disabling"
+echo "$orig_content" > "$file"
+
 # Test target_ids file
 # ====================