[PATCH 4.19 002/152] tracing: Fix number of entries in trace header

From: Greg Kroah-Hartman
Date: Mon Feb 25 2019 - 16:20:39 EST


4.19-stable review patch. If anyone has any objections, please let me know.

------------------

From: Quentin Perret <quentin.perret@xxxxxxx>

commit 9e7382153f80ba45a0bbcd540fb77d4b15f6e966 upstream.

The following commit

441dae8f2f29 ("tracing: Add support for display of tgid in trace output")

removed the call to print_event_info() from print_func_help_header_irq()
which results in the ftrace header not reporting the number of entries
written in the buffer. As this wasn't the original intent of the patch,
re-introduce the call to print_event_info() to restore the orginal
behaviour.

Link: http://lkml.kernel.org/r/20190214152950.4179-1-quentin.perret@xxxxxxx

Acked-by: Joel Fernandes <joelaf@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Fixes: 441dae8f2f29 ("tracing: Add support for display of tgid in trace output")
Signed-off-by: Quentin Perret <quentin.perret@xxxxxxx>
Signed-off-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
kernel/trace/trace.c | 2 ++
1 file changed, 2 insertions(+)

--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -3383,6 +3383,8 @@ static void print_func_help_header_irq(s
const char tgid_space[] = " ";
const char space[] = " ";

+ print_event_info(buf, m);
+
seq_printf(m, "# %s _-----=> irqs-off\n",
tgid ? tgid_space : space);
seq_printf(m, "# %s / _----=> need-resched\n",