NFSD: Remove the nfsd_cb_work and nfsd_cb_done tracepoints

Clean up: These are noise in properly working systems. If you really
need to observe the operation of the callback mechanism, use the
sunrpc:rpc\* tracepoints along with the workqueue tracepoints.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

fs/nfsd/nfs4callback.c

@@ -970,7 +970,6 @@ static void nfsd4_cb_probe_done(struct rpc_task *task, void *calldata)
 {
 	struct nfs4_client *clp = container_of(calldata, struct nfs4_client, cl_cb_null);
 
-	trace_nfsd_cb_done(clp, task->tk_status);
 	if (task->tk_status)
 		nfsd4_mark_cb_down(clp, task->tk_status);
 	else
@@ -1172,8 +1171,6 @@ static void nfsd4_cb_done(struct rpc_task *task, void *calldata)
 	struct nfsd4_callback *cb = calldata;
 	struct nfs4_client *clp = cb->cb_clp;
 
-	trace_nfsd_cb_done(clp, task->tk_status);
-
 	if (!nfsd4_cb_sequence_done(task, cb))
 		return;
 
@@ -1326,8 +1323,6 @@ nfsd4_run_cb_work(struct work_struct *work)
 	struct rpc_clnt *clnt;
 	int flags;
 
-	trace_nfsd_cb_work(clp, cb->cb_msg.rpc_proc->p_name);
-
 	if (cb->cb_need_restart) {
 		cb->cb_need_restart = false;
 	} else {

fs/nfsd/trace.h

@@ -979,54 +979,6 @@ TRACE_EVENT(nfsd_cb_setup_err,
 		__entry->addr, __entry->cl_boot, __entry->cl_id, __entry->error)
 );
 
-TRACE_EVENT(nfsd_cb_work,
-	TP_PROTO(
-		const struct nfs4_client *clp,
-		const char *procedure
-	),
-	TP_ARGS(clp, procedure),
-	TP_STRUCT__entry(
-		__field(u32, cl_boot)
-		__field(u32, cl_id)
-		__string(procedure, procedure)
-		__array(unsigned char, addr, sizeof(struct sockaddr_in6))
-	),
-	TP_fast_assign(
-		__entry->cl_boot = clp->cl_clientid.cl_boot;
-		__entry->cl_id = clp->cl_clientid.cl_id;
-		__assign_str(procedure, procedure)
-		memcpy(__entry->addr, &clp->cl_cb_conn.cb_addr,
-			sizeof(struct sockaddr_in6));
-	),
-	TP_printk("addr=%pISpc client %08x:%08x procedure=%s",
-		__entry->addr, __entry->cl_boot, __entry->cl_id,
-		__get_str(procedure))
-);
-
-TRACE_EVENT(nfsd_cb_done,
-	TP_PROTO(
-		const struct nfs4_client *clp,
-		int status
-	),
-	TP_ARGS(clp, status),
-	TP_STRUCT__entry(
-		__field(u32, cl_boot)
-		__field(u32, cl_id)
-		__field(int, status)
-		__array(unsigned char, addr, sizeof(struct sockaddr_in6))
-	),
-	TP_fast_assign(
-		__entry->cl_boot = clp->cl_clientid.cl_boot;
-		__entry->cl_id = clp->cl_clientid.cl_id;
-		__entry->status = status;
-		memcpy(__entry->addr, &clp->cl_cb_conn.cb_addr,
-			sizeof(struct sockaddr_in6));
-	),
-	TP_printk("addr=%pISpc client %08x:%08x status=%d",
-		__entry->addr, __entry->cl_boot, __entry->cl_id,
-		__entry->status)
-);
-
 TRACE_EVENT(nfsd_cb_recall,
 	TP_PROTO(
 		const struct nfs4_stid *stid