tracing: remove extra latency_trace method from trace structure

Impact: clean up

The trace and latency_trace function pointers are identical for
every tracer but the function tracer. The differences in the function
tracer are trivial (latency output puts paranthesis around parent).

This patch removes the latency_trace pointer and all prints will
now just use the trace output function pointer.
Signed-off-by: Steven Rostedt <srostedt@redhat.com>

kernel/trace/blktrace.c

@@ -1231,7 +1231,6 @@ static struct tracer blk_tracer __read_mostly = {
 static struct trace_event trace_blk_event = {
 	.type	 	= TRACE_BLK,
 	.trace		= blk_trace_event_print,
-	.latency_trace	= blk_trace_event_print,
 	.binary		= blk_trace_event_print_binary,
 };
 

kernel/trace/trace.c

@@ -1485,7 +1485,7 @@ static enum print_line_t print_lat_fmt(struct trace_iterator *iter)
 	}
 
 	if (event)
-		return event->latency_trace(iter, sym_flags);
+		return event->trace(iter, sym_flags);
 
 	if (!trace_seq_printf(s, "Unknown type %d\n", entry->type))
 		goto partial;

kernel/trace/trace_branch.c

@@ -159,7 +159,6 @@ static enum print_line_t trace_branch_print(struct trace_iterator *iter,
 static struct trace_event trace_branch_event = {
 	.type	 	= TRACE_BRANCH,
 	.trace		= trace_branch_print,
-	.latency_trace	= trace_branch_print,
 };
 
 static struct tracer branch_trace __read_mostly =

kernel/trace/trace_output.c

@@ -437,8 +437,6 @@ int register_ftrace_event(struct trace_event *event)
 
 	if (event->trace == NULL)
 		event->trace = trace_nop_print;
-	if (event->latency_trace == NULL)
-		event->latency_trace = trace_nop_print;
 	if (event->raw == NULL)
 		event->raw = trace_nop_print;
 	if (event->hex == NULL)
@@ -480,29 +478,6 @@ enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags)
 }
 
 /* TRACE_FN */
-static enum print_line_t trace_fn_latency(struct trace_iterator *iter,
-					  int flags)
-{
-	struct ftrace_entry *field;
-	struct trace_seq *s = &iter->seq;
-
-	trace_assign_type(field, iter->ent);
-
-	if (!seq_print_ip_sym(s, field->ip, flags))
-		goto partial;
-	if (!trace_seq_puts(s, " ("))
-		goto partial;
-	if (!seq_print_ip_sym(s, field->parent_ip, flags))
-		goto partial;
-	if (!trace_seq_puts(s, ")\n"))
-		goto partial;
-
-	return TRACE_TYPE_HANDLED;
-
- partial:
-	return TRACE_TYPE_PARTIAL_LINE;
-}
-
 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags)
 {
 	struct ftrace_entry *field;
@@ -573,7 +548,6 @@ static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags)
 static struct trace_event trace_fn_event = {
 	.type	 	= TRACE_FN,
 	.trace		= trace_fn_trace,
-	.latency_trace	= trace_fn_latency,
 	.raw		= trace_fn_raw,
 	.hex		= trace_fn_hex,
 	.binary		= trace_fn_bin,
@@ -705,7 +679,6 @@ static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
 static struct trace_event trace_ctx_event = {
 	.type	 	= TRACE_CTX,
 	.trace		= trace_ctx_print,
-	.latency_trace	= trace_ctx_print,
 	.raw		= trace_ctx_raw,
 	.hex		= trace_ctx_hex,
 	.binary		= trace_ctxwake_bin,
@@ -714,7 +687,6 @@ static struct trace_event trace_ctx_event = {
 static struct trace_event trace_wake_event = {
 	.type	 	= TRACE_WAKE,
 	.trace		= trace_wake_print,
-	.latency_trace	= trace_wake_print,
 	.raw		= trace_wake_raw,
 	.hex		= trace_wake_hex,
 	.binary		= trace_ctxwake_bin,
@@ -770,7 +742,6 @@ static enum print_line_t trace_special_bin(struct trace_iterator *iter,
 static struct trace_event trace_special_event = {
 	.type	 	= TRACE_SPECIAL,
 	.trace		= trace_special_print,
-	.latency_trace	= trace_special_print,
 	.raw		= trace_special_print,
 	.hex		= trace_special_hex,
 	.binary		= trace_special_bin,
@@ -808,7 +779,6 @@ static enum print_line_t trace_stack_print(struct trace_iterator *iter,
 static struct trace_event trace_stack_event = {
 	.type	 	= TRACE_STACK,
 	.trace		= trace_stack_print,
-	.latency_trace	= trace_stack_print,
 	.raw		= trace_special_print,
 	.hex		= trace_special_hex,
 	.binary		= trace_special_bin,
@@ -838,7 +808,6 @@ static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
 static struct trace_event trace_user_stack_event = {
 	.type	 	= TRACE_USER_STACK,
 	.trace		= trace_user_stack_print,
-	.latency_trace	= trace_user_stack_print,
 	.raw		= trace_special_print,
 	.hex		= trace_special_hex,
 	.binary		= trace_special_bin,
@@ -883,7 +852,6 @@ static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags)
 static struct trace_event trace_print_event = {
 	.type	 	= TRACE_PRINT,
 	.trace		= trace_print_print,
-	.latency_trace	= trace_print_print,
 	.raw		= trace_print_raw,
 };
 

kernel/trace/trace_output.h

@@ -10,7 +10,6 @@ struct trace_event {
 	struct hlist_node	node;
 	int			type;
 	trace_print_func	trace;
-	trace_print_func	latency_trace;
 	trace_print_func	raw;
 	trace_print_func	hex;
 	trace_print_func	binary;