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Implement a kselftest for DAMON's {min,max}_nr_regions' parameters. The test ensures both the minimum and the maximum number of regions limit is respected even if the workload's real number of regions is less than the minimum or larger than the maximum limits. Link: https://lkml.kernel.org/r/20240625180538.73134-7-sj@kernel.org Signed-off-by: SeongJae Park <sj@kernel.org> Cc: Shuah Khan <shuah@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>