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The implementation of unsigned long type range directories can be reused
by multiple DAMON sysfs directories including those for DAMON-based
Operation Schemes and the range of number of monitoring regions.  Move the
code into the files for DAMON sysfs common logics.

Link: https://lkml.kernel.org/r/20221026225943.100429-9-sj@kernel.org

Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>