SUNRPC: Don't display the rpc_show_tasks header if there are no tasks

Clean up: don't display the rpc_show_tasks column header unless there is at
least one task to display.  As far as I can tell, it is safe to let the
list_for_each_entry macro decide that each list is empty.

scripts/checkpatch.pl also wants a KERN_FOO at the start of any newly added
printk() calls, so this and subsequent patches will also add KERN_INFO.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index ab8038d..7dda328 100644 (file)
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -1526,24 +1526,30 @@ struct rpc_task *rpc_call_null(struct rpc_clnt *clnt, struct rpc_cred *cred, int
 EXPORT_SYMBOL_GPL(rpc_call_null);
 
 #ifdef RPC_DEBUG
+static void rpc_show_header(void)
+{
+       printk(KERN_INFO "-pid- proc flgs status -client- -prog- --rqstp- "
+               "-timeout -rpcwait -action- ---ops--\n");
+}
+
 void rpc_show_tasks(void)
 {
        struct rpc_clnt *clnt;
        struct rpc_task *t;
+       int header = 0;
 
        spin_lock(&rpc_client_lock);
-       if (list_empty(&all_clients))
-               goto out;
-       printk("-pid- proc flgs status -client- -prog- --rqstp- -timeout "
-               "-rpcwait -action- ---ops--\n");
        list_for_each_entry(clnt, &all_clients, cl_clients) {
-               if (list_empty(&clnt->cl_tasks))
-                       continue;
                spin_lock(&clnt->cl_lock);
                list_for_each_entry(t, &clnt->cl_tasks, tk_task) {
                        const char *rpc_waitq = "none";
                        int proc;
 
+                       if (!header) {
+                               rpc_show_header();
+                               header++;
+                       }
+
                        if (t->tk_msg.rpc_proc)
                                proc = t->tk_msg.rpc_proc->p_proc;
                        else
@@ -1563,7 +1569,6 @@ void rpc_show_tasks(void)
                }
                spin_unlock(&clnt->cl_lock);
        }
-out:
        spin_unlock(&rpc_client_lock);
 }
 #endif