From: SeongJae Park sj@kernel.org
mainline inclusion from mainline-v5.16-rc5 commit c6980e30af356e85699f37142ae435a6aa483ceb category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I4RTX9
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
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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@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 (cherry picked from commit c6980e30af356e85699f37142ae435a6aa483ceb) Signed-off-by: Yue Zou zouyue3@huawei.com Reviewed-by: Kefeng Wangwangkefeng.wang@huawei.com Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- tools/testing/selftests/damon/debugfs_attrs.sh | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/tools/testing/selftests/damon/debugfs_attrs.sh b/tools/testing/selftests/damon/debugfs_attrs.sh index fc80380c59f0..d0916373f310 100644 --- a/tools/testing/selftests/damon/debugfs_attrs.sh +++ b/tools/testing/selftests/damon/debugfs_attrs.sh @@ -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"