mm: page_alloc: call panic() when memoryless node allocation fails

In free_area_init(), we will continue to run after allocation of
memoryless node pgdat fails.  However, in the subsequent process (such as
when initializing zonelist), the case that NODE_DATA(nid) is NULL is not
handled, which will cause panic.  Instead of this, it's better to call
panic() directly when the memory allocation fails during system boot.

Link: https://lkml.kernel.org/r/20230212111027.95520-1-zhengqi.arch@bytedance.comSigned-off-by: Qi Zheng <zhengqi.arch@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/page_alloc.c

@@ -8405,11 +8405,9 @@ void __init free_area_init(unsigned long *max_zone_pfn)
 
 			/* Allocator not initialized yet */
 			pgdat = arch_alloc_nodedata(nid);
-			if (!pgdat) {
-				pr_err("Cannot allocate %zuB for node %d.\n",
-						sizeof(*pgdat), nid);
-				continue;
-			}
+			if (!pgdat)
+				panic("Cannot allocate %zuB for node %d.\n",
+				       sizeof(*pgdat), nid);
 			arch_refresh_nodedata(nid, pgdat);
 			free_area_init_memoryless_node(nid);