FAILED: patch "[PATCH] mm/huge_memory: preserve PG_has_hwpoisoned if a folio is" failed to apply to 6.12-stable tree

index feac4aef7dfb..b4ff49d96501 100644
@@ -3263,6 +3263,14 @@ bool can_split_folio(struct folio *folio, int caller_pins, int *pextra_pins)
 					caller_pins;
 }
 
+static bool page_range_has_hwpoisoned(struct page *page, long nr_pages)
+{
+	for (; nr_pages; page++, nr_pages--)
+		if (PageHWPoison(page))
+			return true;
+	return false;
+}
+
 /*
  * It splits @folio into @new_order folios and copies the @folio metadata to
  * all the resulting folios.

@@ -3270,17 +3278,24 @@ bool can_split_folio(struct folio *folio, int caller_pins, int *pextra_pins)
 static void __split_folio_to_order(struct folio *folio, int old_order,
 		int new_order)
 {
+	/* Scan poisoned pages when split a poisoned folio to large folios */
+	const bool handle_hwpoison = folio_test_has_hwpoisoned(folio) && new_order;
 	long new_nr_pages = 1 << new_order;
 	long nr_pages = 1 << old_order;
 	long i;
 
+	folio_clear_has_hwpoisoned(folio);
+
+	/* Check first new_nr_pages since the loop below skips them */
+	if (handle_hwpoison &&
+	    page_range_has_hwpoisoned(folio_page(folio, 0), new_nr_pages))
+		folio_set_has_hwpoisoned(folio);
 	/*
 	 * Skip the first new_nr_pages, since the new folio from them have all
 	 * the flags from the original folio.
 	 */
 	for (i = new_nr_pages; i < nr_pages; i += new_nr_pages) {
 		struct page *new_head = &folio->page + i;
-
 		/*
 		 * Careful: new_folio is not a "real" folio before we cleared PageTail.
 		 * Don't pass it around before clear_compound_head().

@@ -3322,6 +3337,10 @@ static void __split_folio_to_order(struct folio *folio, int old_order,
 				 (1L << PG_dirty) |
 				 LRU_GEN_MASK | LRU_REFS_MASK));
 
+		if (handle_hwpoison &&
+		    page_range_has_hwpoisoned(new_head, new_nr_pages))
+			folio_set_has_hwpoisoned(new_folio);
+
 		new_folio->mapping = folio->mapping;
 		new_folio->index = folio->index + i;
 

@@ -3422,8 +3441,6 @@ static int __split_unmapped_folio(struct folio *folio, int new_order,
 	if (folio_test_anon(folio))
 		mod_mthp_stat(order, MTHP_STAT_NR_ANON, -1);
 
-	folio_clear_has_hwpoisoned(folio);
-
 	/*
 	 * split to new_order one order at a time. For uniform split,
 	 * folio is split to new_order directly.

index 0bb0ce0c106b..d68a22c729fb 100644
@@ -3091,9 +3091,17 @@ static void lru_add_page_tail(struct folio *folio, struct page *tail,
 	}
 }
 
+static bool page_range_has_hwpoisoned(struct page *page, long nr_pages)
+{
+	for (; nr_pages; page++, nr_pages--)
+		if (PageHWPoison(page))
+			return true;
+	return false;
+}
+
 static void __split_huge_page_tail(struct folio *folio, int tail,
 		struct lruvec *lruvec, struct list_head *list,
-		unsigned int new_order)
+		unsigned int new_order, const bool handle_hwpoison)
 {
 	struct page *head = &folio->page;
 	struct page *page_tail = head + tail;

@@ -3170,6 +3178,11 @@ static void __split_huge_page_tail(struct folio *folio, int tail,
 		folio_set_large_rmappable(new_folio);
 	}
 
+	/* Set has_hwpoisoned flag on new_folio if any of its pages is HWPoison */
+	if (handle_hwpoison &&
+	    page_range_has_hwpoisoned(page_tail, 1 << new_order))
+		folio_set_has_hwpoisoned(new_folio);
+
 	/* Finally unfreeze refcount. Additional reference from page cache. */
 	page_ref_unfreeze(page_tail,
 		1 + ((!folio_test_anon(folio) || folio_test_swapcache(folio)) ?

@@ -3194,6 +3207,8 @@ static void __split_huge_page(struct page *page, struct list_head *list,
 		pgoff_t end, unsigned int new_order)
 {
 	struct folio *folio = page_folio(page);
+	/* Scan poisoned pages when split a poisoned folio to large folios */
+	const bool handle_hwpoison = folio_test_has_hwpoisoned(folio) && new_order;
 	struct page *head = &folio->page;
 	struct lruvec *lruvec;
 	struct address_space *swap_cache = NULL;

@@ -3217,8 +3232,14 @@ static void __split_huge_page(struct page *page, struct list_head *list,
 
 	ClearPageHasHWPoisoned(head);
 
+	/* Check first new_nr pages since the loop below skips them */
+	if (handle_hwpoison &&
+	    page_range_has_hwpoisoned(folio_page(folio, 0), new_nr))
+		folio_set_has_hwpoisoned(folio);
+
 	for (i = nr - new_nr; i >= new_nr; i -= new_nr) {
-		__split_huge_page_tail(folio, i, lruvec, list, new_order);
+		__split_huge_page_tail(folio, i, lruvec, list, new_order,
+				       handle_hwpoison);
 		/* Some pages can be beyond EOF: drop them from page cache */
 		if (head[i].index >= end) {
 			struct folio *tail = page_folio(head + i);