diff --git a/mm/memory.c b/mm/memory.c
index 30e6d0248a3d70..a7bf87cf2ba0e9 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1313,6 +1313,17 @@ struct zap_details {
 	struct folio *single_folio;	/* Locked folio to be unmapped */
 };
 
+/* Whether we should zap all COWed (private) pages too */
+static inline bool should_zap_cows(struct zap_details *details)
+{
+	/* By default, zap all pages */
+	if (!details)
+		return true;
+
+	/* Or, we zap COWed pages only if the caller wants to */
+	return !details->zap_mapping;
+}
+
 /*
  * We set details->zap_mapping when we want to unmap shared but keep private
  * pages. Return true if skip zapping this page, false otherwise.
@@ -1320,11 +1331,15 @@ struct zap_details {
 static inline bool
 zap_skip_check_mapping(struct zap_details *details, struct page *page)
 {
-	if (!details || !page)
+	/* If we can make a decision without *page.. */
+	if (should_zap_cows(details))
+		return false;
+
+	/* E.g. the caller passes NULL for the case of a zero page */
+	if (!page)
 		return false;
 
-	return details->zap_mapping &&
-		(details->zap_mapping != page_rmapping(page));
+	return details->zap_mapping != page_rmapping(page);
 }
 
 static unsigned long zap_pte_range(struct mmu_gather *tlb,
@@ -1405,17 +1420,24 @@ static unsigned long zap_pte_range(struct mmu_gather *tlb,
 			continue;
 		}
 
-		/* If details->check_mapping, we leave swap entries. */
-		if (unlikely(details))
-			continue;
-
-		if (!non_swap_entry(entry))
+		if (!non_swap_entry(entry)) {
+			/* Genuine swap entry, hence a private anon page */
+			if (!should_zap_cows(details))
+				continue;
 			rss[MM_SWAPENTS]--;
-		else if (is_migration_entry(entry)) {
+		} else if (is_migration_entry(entry)) {
 			struct page *page;
 
 			page = pfn_swap_entry_to_page(entry);
+			if (zap_skip_check_mapping(details, page))
+				continue;
 			rss[mm_counter(page)]--;
+		} else if (is_hwpoison_entry(entry)) {
+			if (!should_zap_cows(details))
+				continue;
+		} else {
+			/* We should have covered all the swap entry types */
+			WARN_ON_ONCE(1);
 		}
 		if (unlikely(!free_swap_and_cache(entry)))
 			print_bad_pte(vma, addr, ptent, NULL);