diff --git a/mm/ksm.c b/mm/ksm.c
index dbfb8f98b189..910a1307ac9f 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -1463,6 +1463,10 @@ static int replace_page(struct vm_area_struct *vma, struct page *page,
 		dec_mm_counter(mm, MM_ANONPAGES);
 	}
 
+	/* Preserve soft-dirty when replacing the page. */
+	if (pte_soft_dirty(orig_pte))
+		newpte = pte_mksoft_dirty(newpte);
+
 	flush_cache_page(vma, addr, pte_pfn(ptep_get(ptep)));
 	/*
 	 * No need to notify as we are replacing a read only page with another