tracing: Have max_latency be defined for HWLAT_TRACER as well

The hwlat tracer uses tr->max_latency, and if it's the only tracer enabled
that uses it, the build will fail. Add max_latency and its file when the
hwlat tracer is enabled.

Link: http://lkml.kernel.org/r/[e-mail]

Reported-by: Randy Dunlap <[e-mail]>
Tested-by: Randy Dunlap <[e-mail]>
Acked-by: Randy Dunlap <[e-mail]>
Signed-off-by: Steven Rostedt <[e-mail]>

kernel/trace/trace.c

···
 	return ret;
 }
 
-#ifdef CONFIG_TRACER_MAX_TRACE
+#if defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER)
 
 static ssize_t
 tracing_max_lat_read(struct file *filp, char __user *ubuf,
···
 	.llseek		= generic_file_llseek,
 };
 
-#ifdef CONFIG_TRACER_MAX_TRACE
+#if defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER)
 static const struct file_operations tracing_max_lat_fops = {
 	.open		= tracing_open_generic,
 	.read		= tracing_max_lat_read,
···
 
 	create_trace_options_dir(tr);
 
-#ifdef CONFIG_TRACER_MAX_TRACE
+#if defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER)
 	trace_create_file("tracing_max_latency", 0644, d_tracer,
 			&tr->max_latency, &tracing_max_lat_fops);
 #endif

kernel/trace/trace.h

···
 	 */
 	struct trace_buffer	max_buffer;
 	bool			allocated_snapshot;
+#endif
+#if defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER)
 	unsigned long		max_latency;
 #endif
 	struct trace_pid_list	__rcu *filtered_pids;