linux-kernel - [PATCH v2] tracing: Fix number of entries in trace header

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Message-Id: <20190214152950.4179-1-quentin.perret@arm.com>
Date:   Thu, 14 Feb 2019 15:29:50 +0000
From:   Quentin Perret <quentin.perret@....com>
To:     rostedt@...dmis.org, mingo@...hat.com
Cc:     linux-kernel@...r.kernel.org, joelaf@...gle.com,
        smuckle@...gle.com, dietmar.eggemann@....com,
        quentin.perret@....com
Subject: [PATCH v2] tracing: Fix number of entries in trace header

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.

Fixes: 441dae8f2f29 ("tracing: Add support for display of tgid in trace output")
Cc: 4.13+ <stable@...r.kernel.org> # v4.13+
Signed-off-by: Quentin Perret <quentin.perret@....com>
Acked-by: Joel Fernandes <joelaf@...gle.com>
---
 kernel/trace/trace.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index c521b7347482..c4238b441624 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -3384,6 +3384,8 @@ 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",
-- 
2.20.1