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-rw-r--r--include/linux/damon.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/damon.h b/include/linux/damon.h
index 60e6da3012fa..7d0265d02954 100644
--- a/include/linux/damon.h
+++ b/include/linux/damon.h
@@ -55,6 +55,8 @@ struct damon_size_range {
* @list: List head for siblings.
* @age: Age of this region.
*
+ * For any use case, @ar should be non-zero positive size.
+ *
* @nr_accesses is reset to zero for every &damon_attrs->aggr_interval and be
* increased for every &damon_attrs->sample_interval if an access to the region
* during the last sampling interval is found. The update of this field should