diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index f6fa99eca5158f36d3fe38a23baac5b7c54ca6bb..d2a70cf2154e68958b57c3e884b7614522a925c4 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -1070,7 +1070,7 @@ static ssize_t clear_refs_write(struct file *file, const char __user *buf,
 			}
 			mmu_notifier_invalidate_range_start(mm, 0, -1);
 		}
-		walk_page_range(0, ~0UL, &clear_refs_walk);
+		walk_page_range(0, mm->highest_vm_end, &clear_refs_walk);
 		if (type == CLEAR_REFS_SOFT_DIRTY)
 			mmu_notifier_invalidate_range_end(mm, 0, -1);
 		flush_tlb_mm(mm);