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selftests/damon: test DAMON enabling with empty target_ids case

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DAMON debugfs didn't check empty targets when starting monitoring, and
the issue is fixed with commit b5ca3e83dd ("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@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Brendan Higgins <brendanhiggins@google.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
SeongJae Park 2021-12-10 14:46:49 -08:00 committed by Linus Torvalds
parent 964e17016c
commit c6980e30af
1 changed files with 9 additions and 0 deletions
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9
tools/testing/selftests/damon/debugfs_attrs.sh
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@ -94,4 +94,13 @@ test_write_succ "$file" "" "$orig_content" "empty input"
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"