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/d6c3b7eb-ba95-1ffa-0453-464e1e24262a@infradead.org
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 474cc81..e0d0cfc 100644 (file)
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -4945,7 +4945,7 @@ out:
        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,
@@ -5867,7 +5867,7 @@ static const struct file_operations tracing_thresh_fops = {
        .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,
@@ -7195,7 +7195,7 @@ init_tracer_tracefs(struct trace_array *tr, struct dentry *d_tracer)
 
        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

diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 1d866b0..fd24b1f 100644 (file)
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -214,6 +214,8 @@ struct trace_array {
         */
        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;