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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>