Found some struct instances that can be const

src/apps/snmp/snmp_core.c

@@ -60,15 +60,15 @@ const struct snmp_obj_id_const_ref snmp_zero_dot_zero = { LWIP_ARRAYSIZE(snmp_ze
 
 #if SNMP_LWIP_MIB2
 #include "lwip/apps/snmp_mib2.h"
-static const struct snmp_mib *default_mibs[] = { &mib2 };
-static u8_t snmp_num_mibs                    = 1;
+static const struct snmp_mib* const default_mibs[] = { &mib2 };
+static u8_t snmp_num_mibs                          = 1;
 #else
-static const struct snmp_mib *default_mibs[] = { NULL };
-static u8_t snmp_num_mibs                    = 0;
+static const struct snmp_mib* const default_mibs[] = { NULL };
+static u8_t snmp_num_mibs                          = 0;
 #endif
 
 /* List of known mibs */
-static struct snmp_mib const **snmp_mibs = default_mibs;
+static struct snmp_mib const * const *snmp_mibs = default_mibs;
 
 /**
  * Sets the MIBs to use.

src/apps/snmp/snmp_mib2.c

@@ -195,7 +195,7 @@ CREATE_LWIP_SYNC_NODE(7, udp_endpointTable)
 CREATE_LWIP_SYNC_NODE(8, udp_HCInDatagrams)
 CREATE_LWIP_SYNC_NODE(9, udp_HCOutDatagrams)
 
-static const struct snmp_node* udp_nodes[] = {
+static const struct snmp_node* const udp_nodes[] = {
   &SYNC_NODE_NAME(udp_inDatagrams).node.node,
   &SYNC_NODE_NAME(udp_noPorts).node.node,
   &SYNC_NODE_NAME(udp_inErrors).node.node,
@@ -294,7 +294,7 @@ CREATE_LWIP_SYNC_NODE(18, tcp_HCOutSegs)
 CREATE_LWIP_SYNC_NODE(19, tcp_ConnectionTable)
 CREATE_LWIP_SYNC_NODE(20, tcp_ListenerTable)
 
-static const struct snmp_node* tcp_nodes[] = {
+static const struct snmp_node* const tcp_nodes[] = {
   &SYNC_NODE_NAME(tcp_RtoAlgorithm).node.node,
   &SYNC_NODE_NAME(tcp_RtoMin).node.node,
   &SYNC_NODE_NAME(tcp_RtoMax).node.node,
@@ -458,7 +458,7 @@ CREATE_LWIP_SYNC_NODE(22, ip_NetToMediaTable)
 #endif /* LWIP_ARP */
 CREATE_LWIP_SYNC_NODE(23, ip_RoutingDiscards)
 
-static const struct snmp_node* ip_nodes[] = {
+static const struct snmp_node* const ip_nodes[] = {
   &SYNC_NODE_NAME(ip_Forwarding).node.node,
   &SYNC_NODE_NAME(ip_DefaultTTL).node.node,
   &SYNC_NODE_NAME(ip_InReceives).node.node,
@@ -504,7 +504,7 @@ static const struct snmp_table_simple_node at_Table = SNMP_TABLE_CREATE_SIMPLE(1
 /* the following nodes access variables in LWIP stack from SNMP worker thread and must therefore be synced to LWIP (TCPIP) thread */ 
 CREATE_LWIP_SYNC_NODE(1, at_Table)
 
-static const struct snmp_node* at_nodes[] = {
+static const struct snmp_node* const at_nodes[] = {
   &SYNC_NODE_NAME(at_Table).node.node
 };
 
@@ -568,7 +568,7 @@ static const struct snmp_table_node interfaces_Table = SNMP_TABLE_CREATE(
 CREATE_LWIP_SYNC_NODE(1, interfaces_Number)
 CREATE_LWIP_SYNC_NODE(2, interfaces_Table)
 
-static const struct snmp_node* interface_nodes[] = {
+static const struct snmp_node* const interface_nodes[] = {
   &SYNC_NODE_NAME(interfaces_Number).node.node,
   &SYNC_NODE_NAME(interfaces_Table).node.node
 };
@@ -593,7 +593,7 @@ static const struct snmp_scalar_array_node_def system_nodes[] = {
 static const struct snmp_scalar_array_node system_node = SNMP_SCALAR_CREATE_ARRAY_NODE(1, system_nodes, system_get_value, system_set_test, system_set_value);
 
 /* --- mib-2 .1.3.6.1.2.1 ----------------------------------------------------- */
-static const struct snmp_node* mib2_nodes[] = {
+static const struct snmp_node* const mib2_nodes[] = {
   &system_node.node.node,
   &interface_root.node,
 #if LWIP_ARP && LWIP_IPV4

src/core/memp.c

@@ -72,7 +72,7 @@
 #define LWIP_MEMPOOL(name,num,size,desc) LWIP_MEMPOOL_DECLARE(name,num,size,desc)
 #include "lwip/priv/memp_std.h"
 
-const struct memp_desc *memp_pools[MEMP_MAX] = {
+const struct memp_desc* const memp_pools[MEMP_MAX] = {
 #define LWIP_MEMPOOL(name,num,size,desc) &memp_ ## name,
 #include "lwip/priv/memp_std.h"
 };

src/include/lwip/memp.h

@@ -62,7 +62,7 @@ typedef enum {
  *   extern u8_t __attribute__((section(".onchip_mem"))) memp_memory_my_private_pool[];
  */
 
-extern const struct memp_desc *memp_pools[MEMP_MAX];
+extern const struct memp_desc* const memp_pools[MEMP_MAX];
 
 #define LWIP_MEMPOOL_PROTOTYPE(name) extern const struct memp_desc memp_ ## name