ring-buffer: Check if buffer exists before polling

[platform/adaptation/renesas_rcar/renesas_kernel.git] / kernel / trace / trace.h

diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 02b592f..c8bd809 100644 (file)
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -336,7 +336,7 @@ struct tracer {
        void                    (*stop)(struct trace_array *tr);
        void                    (*open)(struct trace_iterator *iter);
        void                    (*pipe_open)(struct trace_iterator *iter);
-       void                    (*wait_pipe)(struct trace_iterator *iter);
+       int                     (*wait_pipe)(struct trace_iterator *iter);
        void                    (*close)(struct trace_iterator *iter);
        void                    (*pipe_close)(struct trace_iterator *iter);
        ssize_t                 (*read)(struct trace_iterator *iter,
@@ -552,7 +552,7 @@ void trace_init_global_iter(struct trace_iterator *iter);
 
 void tracing_iter_reset(struct trace_iterator *iter, int cpu);
 
-void poll_wait_pipe(struct trace_iterator *iter);
+int poll_wait_pipe(struct trace_iterator *iter);
 
 void tracing_sched_switch_trace(struct trace_array *tr,
                                struct task_struct *prev,