mm/huge_memory: ensure huge_zero_folio won't have large_rmappable flag set

Ensure huge_zero_folio won't have large_rmappable flag set.  So it can be
reported as thp,zero correctly through stable_page_flags().

Link: https://lkml.kernel.org/r/20240914015306.3656791-1-linmiaohe@huawei.com
Fixes: 5691753d ("mm: convert huge_zero_page to huge_zero_folio")
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/huge_memory.c

@@ -220,6 +220,8 @@ static bool get_huge_zero_page(void)
 		count_vm_event(THP_ZERO_PAGE_ALLOC_FAILED);
 		return false;
 	}
+	/* Ensure zero folio won't have large_rmappable flag set. */
+	folio_clear_large_rmappable(zero_folio);
 	preempt_disable();
 	if (cmpxchg(&huge_zero_folio, NULL, zero_folio)) {
 		preempt_enable();