linux-kernel - [PATCH 4.20 003/183] tracing: Fix number of entries in trace header

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Message-Id: <20190225195055.248478401@linuxfoundation.org>
Date:   Mon, 25 Feb 2019 22:09:36 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Joel Fernandes <joelaf@...gle.com>,
        Quentin Perret <quentin.perret@....com>,
        "Steven Rostedt (VMware)" <rostedt@...dmis.org>
Subject: [PATCH 4.20 003/183] tracing: Fix number of entries in trace header

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

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

From: Quentin Perret <quentin.perret@....com>

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@...gle.com>
Cc: stable@...r.kernel.org
Fixes: 441dae8f2f29 ("tracing: Add support for display of tgid in trace output")
Signed-off-by: Quentin Perret <quentin.perret@....com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

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

--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -3384,6 +3384,8 @@ 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",