mm: totalram_pages remain unchanged when cdmnode not set

ascend inclusion
category: bugfix
bugzilla: NA
CVE: NA

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

ddr_totalram_pages() return totalram_pages remain unchanged
when cdmnode not set.

Fixes: da9b9592e18f ("mm: Change tmpfs size base on ddr size.")
Signed-off-by: NLijun Fang <fanglijun3@huawei.com>
Reviewed-by: NKefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

mm/shmem.c

@@ -115,6 +115,9 @@ static unsigned long ddr_totalram_pages(void)
 	unsigned long managed_pages = 0;
 	pg_data_t *pgdat;
 
+	if (nodes_empty(cdmmask))
+		return totalram_pages;
+
 	for_each_online_node(nid) {
 		if (is_cdm_node(nid))
 			continue;