xfrm: snmp: do not use SNMP_MIB_SENTINEL anymore

Use ARRAY_SIZE(), so that we know the limit at compile time.

Signed-off-by: Eric Dumazet <[e-mail]>
Cc: Steffen Klassert <[e-mail]>
Reviewed-by: Sabrina Dubroca <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

net/xfrm/xfrm_proc.c

···
 	SNMP_MIB_ITEM("XfrmInStateDirError", LINUX_MIB_XFRMINSTATEDIRERROR),
 	SNMP_MIB_ITEM("XfrmInIptfsError", LINUX_MIB_XFRMINIPTFSERROR),
 	SNMP_MIB_ITEM("XfrmOutNoQueueSpace", LINUX_MIB_XFRMOUTNOQSPACE),
-	SNMP_MIB_SENTINEL
 };
 
 static int xfrm_statistics_seq_show(struct seq_file *seq, void *v)
 {
-	unsigned long buff[LINUX_MIB_XFRMMAX];
+	unsigned long buff[ARRAY_SIZE(xfrm_mib_list)];
+	const int cnt = ARRAY_SIZE(xfrm_mib_list);
 	struct net *net = seq->private;
 	int i;
 
-	memset(buff, 0, sizeof(unsigned long) * LINUX_MIB_XFRMMAX);
+	memset(buff, 0, sizeof(buff));
 
 	xfrm_state_update_stats(net);
-	snmp_get_cpu_field_batch(buff, xfrm_mib_list,
-				 net->mib.xfrm_statistics);
-	for (i = 0; xfrm_mib_list[i].name; i++)
+	snmp_get_cpu_field_batch_cnt(buff, xfrm_mib_list, cnt,
+				     net->mib.xfrm_statistics);
+	for (i = 0; i < cnt; i++)
 		seq_printf(seq, "%-24s\t%lu\n", xfrm_mib_list[i].name,
 						buff[i]);