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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>
This commit is contained in:
Steven Rostedt (Red Hat) 2016-09-07 12:45:09 -04:00 committed by Steven Rostedt
parent 7b2c862501
commit f971cc9aab
2 changed files with 5 additions and 3 deletions
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6
kernel/trace/trace.c
View File

@ -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

2
kernel/trace/trace.h
View File

@ -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;