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Subject[patch 8/9] x86, ftrace: call trace->open() before stopping tracing; add trace->print_header()
Add a callback to allow an ftrace plug-in to write its own header.

Move the call to trace->open() up a few lines.

The changes are required by the BTS ftrace plug-in.

Signed-off-by: Markus Metzger <markus.t.metzger@intel.com>
---

Index: ftrace/kernel/trace/trace.c
===================================================================
--- ftrace.orig/kernel/trace/trace.c 2008-11-24 13:46:26.000000000 +0100
+++ ftrace/kernel/trace/trace.c 2008-11-25 08:18:05.000000000 +0100
@@ -2298,7 +2298,9 @@
seq_printf(m, "# tracer: %s\n", iter->trace->name);
seq_puts(m, "#\n");
}
- if (iter->iter_flags & TRACE_FILE_LAT_FMT) {
+ if (iter->trace && iter->trace->print_header)
+ iter->trace->print_header(m);
+ else if (iter->iter_flags & TRACE_FILE_LAT_FMT) {
/* print nothing if the buffers are empty */
if (trace_empty(iter))
return 0;
@@ -2350,6 +2352,10 @@
iter->trace = current_trace;
iter->pos = -1;

+ /* Notify the tracer early; before we stop tracing. */
+ if (iter->trace && iter->trace->open)
+ iter->trace->open(iter);
+
/* Annotate start of buffers if we had overruns */
if (ring_buffer_overruns(iter->tr->buffer))
iter->iter_flags |= TRACE_FILE_ANNOTATE;
@@ -2375,9 +2381,6 @@
/* stop the trace while dumping */
tracing_stop();

- if (iter->trace && iter->trace->open)
- iter->trace->open(iter);
-
mutex_unlock(&trace_types_lock);

out:
Index: ftrace/kernel/trace/trace.h
===================================================================
--- ftrace.orig/kernel/trace/trace.h 2008-11-24 13:46:26.000000000 +0100
+++ ftrace/kernel/trace/trace.h 2008-11-25 08:18:05.000000000 +0100
@@ -311,6 +311,7 @@
int (*selftest)(struct tracer *trace,
struct trace_array *tr);
#endif
+ void (*print_header)(struct seq_file *m);
enum print_line_t (*print_line)(struct trace_iterator *iter);
/* If you handled the flag setting, return 0 */
int (*set_flag)(u32 old_flags, u32 bit, int set);
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