diff --git a/mm/internal.h b/mm/internal.h
index bb65422..66dd214 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -576,8 +576,8 @@ extern long populate_vma_page_range(struct vm_area_struct *vma,
 extern long faultin_vma_page_range(struct vm_area_struct *vma,
 				   unsigned long start, unsigned long end,
 				   bool write, int *locked);
-extern int mlock_future_check(struct mm_struct *mm, unsigned long flags,
-			      unsigned long len);
+extern bool mlock_future_check(struct mm_struct *mm, unsigned long flags,
+			       unsigned long bytes);
 /*
  * mlock_vma_folio() and munlock_vma_folio():
  * should be called with vma's mmap_lock held for read or write,