The cause of the problem is as follows:
1. when cat /sys/devices/system/memory/memory0/valid_zones,
    test_pages_in_a_zone() will be called.
2. test_pages_in_a_zone() finds the zone according to stat_pfn = 0.
    The smallest pfn of the numa node in the mips architecture is 128,
    and the page corresponding to the previous 0~127 pfn is not
    initialized (page->flags is 0xFFFFFFFF)
3. The nid and zonenum obtained using page_zone(pfn_to_page(0)) are out
    of bounds in the corresponding array,
    &NODE_DATA(page_to_nid(page))->node_zones[page_zonenum(page)],
    access to the out-of-bounds zone member variables appear abnormal,
    resulting in Oops.
Therefore, it is necessary to keep the page between 0 and the minimum
pfn to prevent Oops from appearing.

Signed-off-by: zhanglianjie <redacted>
---
  arch/mips/loongson64/numa.c | 3 +++
  1 file changed, 3 insertions(+)

diff --git a/arch/mips/loongson64/numa.c b/arch/mips/loongson64/numa.c
index fa9b4a487a47..dba9e6f17b9e 100644
--- a/arch/mips/loongson64/numa.c
+++ b/arch/mips/loongson64/numa.c

@@ -129,6 +129,9 @@ static void __init node_mem_init(unsigned int node)
  		if (node_end_pfn(0) >= (0xffffffff >> PAGE_SHIFT))
  			memblock_reserve((node_addrspace_offset | 0xfe000000),
  					 32 << 20);
+
+		/* Reserver pfn range 0~node[0]->node_start_pfn */