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Commit 35f5d94187a6 ("mm/damon: implement a function for max nr_accesses safe calculation") has fixed an overflow bug that could cause divide-by-zero. Add a kunit test for the bug to ensure similar bugs are not introduced again. Link: https://lkml.kernel.org/r/20231213190338.54146-3-sj@kernel.org Signed-off-by: SeongJae Park <sj@kernel.org> Cc: Jonathan Corbet <corbet@lwn.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>