rcu: Remove the interface "rcudata.csv"

This patch removes the interface "rcudata.csv" since it is apparently
not used.
Signed-off-by: Michael Wang <wangyun@linux.vnet.ibm.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

kernel/rcutree_trace.c

@@ -174,77 +174,6 @@ static const struct file_operations rcudata_fops = {
 	.release = seq_release,
 };
 
-static void print_one_rcu_data_csv(struct seq_file *m, struct rcu_data *rdp)
-{
-	if (!rdp->beenonline)
-		return;
-	seq_printf(m, "%d,%s,%lu,%lu,%d,%d",
-		   rdp->cpu,
-		   cpu_is_offline(rdp->cpu) ? "\"N\"" : "\"Y\"",
-		   rdp->completed, rdp->gpnum,
-		   rdp->passed_quiesce, rdp->qs_pending);
-	seq_printf(m, ",%d,%llx,%d,%lu",
-		   atomic_read(&rdp->dynticks->dynticks),
-		   rdp->dynticks->dynticks_nesting,
-		   rdp->dynticks->dynticks_nmi_nesting,
-		   rdp->dynticks_fqs);
-	seq_printf(m, ",%lu", rdp->offline_fqs);
-	seq_printf(m, ",%ld,%ld,\"%c%c%c%c\"", rdp->qlen_lazy, rdp->qlen,
-		   ".N"[rdp->nxttail[RCU_NEXT_READY_TAIL] !=
-			rdp->nxttail[RCU_NEXT_TAIL]],
-		   ".R"[rdp->nxttail[RCU_WAIT_TAIL] !=
-			rdp->nxttail[RCU_NEXT_READY_TAIL]],
-		   ".W"[rdp->nxttail[RCU_DONE_TAIL] !=
-			rdp->nxttail[RCU_WAIT_TAIL]],
-		   ".D"[&rdp->nxtlist != rdp->nxttail[RCU_DONE_TAIL]]);
-#ifdef CONFIG_RCU_BOOST
-	seq_printf(m, ",%d,\"%c\"",
-		   per_cpu(rcu_cpu_has_work, rdp->cpu),
-		   convert_kthread_status(per_cpu(rcu_cpu_kthread_status,
-					  rdp->cpu)));
-#endif /* #ifdef CONFIG_RCU_BOOST */
-	seq_printf(m, ",%ld", rdp->blimit);
-	seq_printf(m, ",%lu,%lu,%lu\n",
-		   rdp->n_cbs_invoked, rdp->n_cbs_orphaned, rdp->n_cbs_adopted);
-}
-
-static int show_rcudata_csv(struct seq_file *m, void *v)
-{
-	struct rcu_data *rdp = (struct rcu_data *)v;
-	if (cpumask_first(cpu_possible_mask) == rdp->cpu) {
-		seq_puts(m, "\"CPU\",\"Online?\",\"c\",\"g\",\"pq\",\"pq\",");
-		seq_puts(m, "\"dt\",\"dt nesting\",\"dt NMI nesting\",\"df\",");
-		seq_puts(m, "\"of\",\"qll\",\"ql\",\"qs\"");
-#ifdef CONFIG_RCU_BOOST
-		seq_puts(m, "\"kt\",\"ktl\"");
-#endif /* #ifdef CONFIG_RCU_BOOST */
-		seq_puts(m, ",\"b\",\"ci\",\"co\",\"ca\"\n");
-	}
-
-	print_one_rcu_data_csv(m, rdp);
-	return 0;
-}
-
-static const struct seq_operations rcudate_csv_op = {
-	.start = r_start,
-	.next  = r_next,
-	.stop  = r_stop,
-	.show  = show_rcudata_csv,
-};
-
-static int rcudata_csv_open(struct inode *inode, struct file *file)
-{
-	return r_open(inode, file, &rcudate_csv_op);
-}
-
-static const struct file_operations rcudata_csv_fops = {
-	.owner = THIS_MODULE,
-	.open = rcudata_csv_open,
-	.read = seq_read,
-	.llseek = no_llseek,
-	.release = seq_release,
-};
-
 #ifdef CONFIG_RCU_BOOST
 
 static void print_one_rcu_node_boost(struct seq_file *m, struct rcu_node *rnp)
@@ -496,11 +425,6 @@ static int __init rcutree_trace_init(void)
 			if (!retval)
 				goto free_out;
 
-			retval = debugfs_create_file("rcudata.csv", 0444,
-					rspdir, rsp, &rcudata_csv_fops);
-			if (!retval)
-				goto free_out;
-
 			retval = debugfs_create_file("rcu_pending", 0444,
 					rspdir, rsp, &rcu_pending_fops);
 			if (!retval)