diff --git a/mm/ksm.c b/mm/ksm.c
index ead1abb67495..c1dcc3cb4831 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -3208,6 +3208,7 @@ void rmap_walk_ksm(struct folio *folio, struct rmap_walk_control *rwc)
 	hlist_for_each_entry(rmap_item, &stable_node->hlist, hlist) {
 		/* Ignore the stable/unstable/sqnr flags */
 		const unsigned long addr = rmap_item->address & PAGE_MASK;
+		const unsigned long index = rmap_item->linear_page_index;
 		struct anon_vma *anon_vma = rmap_item->anon_vma;
 		struct anon_vma_chain *vmac;
 		struct vm_area_struct *vma;
@@ -3221,8 +3222,18 @@ void rmap_walk_ksm(struct folio *folio, struct rmap_walk_control *rwc)
 			anon_vma_lock_read(anon_vma);
 		}
 
+		/*
+		 * Currently, KSM folios are always small folios, so it's
+		 * sufficient to search for a single page. We can simply use
+		 * the linear_page_index of the original de-duplicate
+		 * anonymous page that we remembered in the rmap_item while
+		 * de-duplicating. Note that mremap() always de-duplicates KSM
+		 * folios: so if there was mremap() in our parent or our child,
+		 * we wouldn't have the KSM folio mapped in these processes
+		 * anymore.
+		 */
 		anon_vma_interval_tree_foreach(vmac, &anon_vma->rb_root,
-					       0, ULONG_MAX) {
+					       index, index) {
 
 			cond_resched();
 			vma = vmac->vma;