1 files changed, 22 insertions, 15 deletions

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 45551c7b4c36..427da2341bf0 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -1149,22 +1149,22 @@ static void tracing_snapshot_instance_cond(struct trace_array *tr,
 	unsigned long flags;
 
 	if (in_nmi()) {
-		internal_trace_puts("*** SNAPSHOT CALLED FROM NMI CONTEXT ***\n");
-		internal_trace_puts("*** snapshot is being ignored        ***\n");
+		trace_array_puts(tr, "*** SNAPSHOT CALLED FROM NMI CONTEXT ***\n");
+		trace_array_puts(tr, "*** snapshot is being ignored        ***\n");
 		return;
 	}
 
 	if (!tr->allocated_snapshot) {
-		internal_trace_puts("*** SNAPSHOT NOT ALLOCATED ***\n");
-		internal_trace_puts("*** stopping trace here!   ***\n");
-		tracing_off();
+		trace_array_puts(tr, "*** SNAPSHOT NOT ALLOCATED ***\n");
+		trace_array_puts(tr, "*** stopping trace here!   ***\n");
+		tracer_tracing_off(tr);
 		return;
 	}
 
 	/* Note, snapshot can not be used when the tracer uses it */
 	if (tracer->use_max_tr) {
-		internal_trace_puts("*** LATENCY TRACER ACTIVE ***\n");
-		internal_trace_puts("*** Can not use snapshot (sorry) ***\n");
+		trace_array_puts(tr, "*** LATENCY TRACER ACTIVE ***\n");
+		trace_array_puts(tr, "*** Can not use snapshot (sorry) ***\n");
 		return;
 	}
 
@@ -3726,7 +3726,7 @@ __find_next_entry(struct trace_iterator *iter, int *ent_cpu,
 #define STATIC_FMT_BUF_SIZE	128
 static char static_fmt_buf[STATIC_FMT_BUF_SIZE];
 
-static char *trace_iter_expand_format(struct trace_iterator *iter)
+char *trace_iter_expand_format(struct trace_iterator *iter)
 {
 	char *tmp;
 
@@ -4446,8 +4446,11 @@ static enum print_line_t print_trace_fmt(struct trace_iterator *iter)
 	if (trace_seq_has_overflowed(s))
 		return TRACE_TYPE_PARTIAL_LINE;
 
-	if (event)
+	if (event) {
+		if (tr->trace_flags & TRACE_ITER_FIELDS)
+			return print_event_fields(iter, event);
 		return event->funcs->trace(iter, sym_flags, event);
+	}
 
 	trace_seq_printf(s, "Unknown type %d\n", entry->type);
 
@@ -5167,6 +5170,8 @@ loff_t tracing_lseek(struct file *file, loff_t offset, int whence)
 static const struct file_operations tracing_fops = {
 	.open		= tracing_open,
 	.read		= seq_read,
+	.read_iter	= seq_read_iter,
+	.splice_read	= generic_file_splice_read,
 	.write		= tracing_write_stub,
 	.llseek		= tracing_lseek,
 	.release	= tracing_release,
@@ -9514,6 +9519,7 @@ static int __remove_instance(struct trace_array *tr)
 	tracefs_remove(tr->dir);
 	free_percpu(tr->last_func_repeats);
 	free_trace_buffers(tr);
+	clear_tracing_err_log(tr);
 
 	for (i = 0; i < tr->nr_topts; i++) {
 		kfree(tr->topts[i].topts);
@@ -10391,19 +10397,20 @@ out:
 
 void __init ftrace_boot_snapshot(void)
 {
+#ifdef CONFIG_TRACER_MAX_TRACE
 	struct trace_array *tr;
 
-	if (snapshot_at_boot) {
-		tracing_snapshot();
-		internal_trace_puts("** Boot snapshot taken **\n");
-	}
+	if (!snapshot_at_boot)
+		return;
 
 	list_for_each_entry(tr, &ftrace_trace_arrays, list) {
-		if (tr == &global_trace)
+		if (!tr->allocated_snapshot)
 			continue;
-		trace_array_puts(tr, "** Boot snapshot taken **\n");
+
 		tracing_snapshot_instance(tr);
+		trace_array_puts(tr, "** Boot snapshot taken **\n");
 	}
+#endif
 }
 
 void __init early_trace_init(void)