tracing: Fix number of entries in trace header

BugLink: https://bugs.launchpad.net/bugs/1837813
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@arm.com
Acked-by: Joel Fernandes <joelaf@google.com>
Cc: stable@vger.kernel.org
Fixes: 441dae8f2f29 ("tracing: Add support for display of tgid in trace output")
Signed-off-by: Quentin Perret <quentin.perret@arm.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 6de085b3b5ac28f26880c9546b92e8f690f52a95..a5332e6900056c07acd6074e170e751363b778fd 100644 (file)
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -3387,6 +3387,8 @@ static void print_func_help_header_irq(struct trace_buffer *buf, struct seq_file
        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",