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'paddr' DAMON operations set can apply a DAMOS scheme's action to a large folio multiple times in single DAMOS-regions-walk if the folio is laid on multiple DAMON regions. Add a field for DAMOS scheme object that can be used by the underlying ops to know what was the last entity that the scheme's action has applied. The core layer unsets the field when each DAMOS-regions-walk is done for the given scheme. And update 'paddr' ops to use the infrastructure to avoid the problem. Link: https://lkml.kernel.org/r/20250207212033.45269-3-sj@kernel.org Fixes: 57223ac29584 ("mm/damon/paddr: support the pageout scheme") Signed-off-by: SeongJae Park <sj@kernel.org> Reported-by: Usama Arif <usamaarif642@gmail.com> Closes: https://lore.kernel.org/20250203225604.44742-3-usamaarif642@gmail.com Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>