From 8defdd1135e2ce86885973b86ee1797c6cebc3a0 Mon Sep 17 00:00:00 2001
From: Gang Deng <gavin.dg@linux.alibaba.com>
Date: Thu, 16 Sep 2021 12:38:04 +0800
Subject: [PATCH] anolis: mm, kidled: skip node which has none memory

fix #36834759

Or the vmalloc() will print a warn message when the alloc size
equals zero, and kidled stop working.

Signed-off-by: Gang Deng <gavin.dg@linux.alibaba.com>
Reviewed-by: zhongjiang-ali <zhongjiang-ali@linux.alibaba.com>
Reviewed-by: Xu Yu <xuyu@linux.alibaba.com>
---
 mm/kidled.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/mm/kidled.c b/mm/kidled.c
index 78abc078489043..00f282b9a46231 100644
--- a/mm/kidled.c
+++ b/mm/kidled.c
@@ -400,6 +400,10 @@ static bool kidled_scan_node(pg_data_t *pgdat,
 
 #ifdef KIDLED_AGE_NOT_IN_PAGE_FLAGS
 	if (unlikely(!pgdat->node_page_age)) {
+		/* This node has none memory, skip it. */
+		if (!pgdat->node_spanned_pages)
+			return true;
+
 		pgdat->node_page_age = vzalloc(pgdat->node_spanned_pages);
 		if (unlikely(!pgdat->node_page_age))
 			return false;