mm: Demote warning message in vmemmap_verify() to debug level

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4SK3S
CVE: NA

--------------------------------

For a system only have limited mirrored memory or some numa node without
mirrored memory, the per node vmemmap page_structs prefer to allocate
memory from mirrored region, which will lead to vmemmap_verify() report
lots of warning message.

This patch demote the "potential offnode page_structs" warning messages
to debug level to avoid a very long print during bootup.
Signed-off-by: NMa Wupeng <mawupeng1@huawei.com>
Reviewed-by: NXie XiuQi <xiexiuqi@huawei.com>
Reviewed-by: Kefeng Wang<wangkefeng.wang@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

mm/sparse-vmemmap.c

@@ -136,7 +136,7 @@ void __meminit vmemmap_verify(pte_t *pte, int node,
 	int actual_node = early_pfn_to_nid(pfn);
 
 	if (node_distance(actual_node, node) > LOCAL_DISTANCE)
-		pr_warn("[%lx-%lx] potential offnode page_structs\n",
+		pr_debug("[%lx-%lx] potential offnode page_structs\n",
 			start, end - 1);
 }