cifs: print last update time for interface list

[ Upstream commit 05844bd ]

We store the last updated time for interface list while
parsing the interfaces. This change is to just print that
info in DebugData.

Signed-off-by: Shyam Prasad N <sprasad@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Stable-dep-of: fa1d050 ("cifs: account for primary channel in the interface list")
Signed-off-by: Sasha Levin <sashal@kernel.org>

fs/smb/client/cifs_debug.c

@@ -457,8 +457,10 @@ static int cifs_debug_data_proc_show(struct seq_file *m, void *v)
 
 			spin_lock(&ses->iface_lock);
 			if (ses->iface_count)
-				seq_printf(m, "\n\n\tServer interfaces: %zu",
-					   ses->iface_count);
+				seq_printf(m, "\n\n\tServer interfaces: %zu"
+					   "\tLast updated: %lu seconds ago",
+					   ses->iface_count,
+					   (jiffies - ses->iface_last_update) / HZ);
 			j = 0;
 			list_for_each_entry(iface, &ses->iface_list,
 						 iface_head) {