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-rw-r--r--kernel/trace/trace.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 2525042760e6..505f8a45f426 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -1162,6 +1162,13 @@ extern struct mutex event_mutex;
extern struct list_head ftrace_events;
extern const struct file_operations event_trigger_fops;
+extern const struct file_operations event_hist_fops;
+
+#ifdef CONFIG_HIST_TRIGGERS
+extern int register_trigger_hist_cmd(void);
+#else
+static inline int register_trigger_hist_cmd(void) { return 0; }
+#endif
extern int register_trigger_cmds(void);
extern void clear_event_triggers(struct trace_array *tr);