linux-kernel - [PATCH] visl: use canonical ftrace path

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Date:   Tue, 29 Aug 2023 14:46:01 -0600
From:   Ross Zwisler <zwisler@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     Ross Zwisler <zwisler@...gle.com>,
        Mark Rutland <mark.rutland@....com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        linux-media@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
        Daniel Almeida <daniel.almeida@...labora.com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>
Subject: [PATCH] visl: use canonical ftrace path

From: Ross Zwisler <zwisler@...gle.com>

The canonical location for the tracefs filesystem is at /sys/kernel/tracing.

But, from Documentation/trace/ftrace.rst:

  Before 4.1, all ftrace tracing control files were within the debugfs
  file system, which is typically located at /sys/kernel/debug/tracing.
  For backward compatibility, when mounting the debugfs file system,
  the tracefs file system will be automatically mounted at:

  /sys/kernel/debug/tracing

Update the visl decoder driver documentation to use this tracefs path.

Signed-off-by: Ross Zwisler <zwisler@...gle.com>
---
 Documentation/admin-guide/media/visl.rst | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/Documentation/admin-guide/media/visl.rst b/Documentation/admin-guide/media/visl.rst
index 7d2dc78341c9..4328c6c72d30 100644
--- a/Documentation/admin-guide/media/visl.rst
+++ b/Documentation/admin-guide/media/visl.rst
@@ -78,7 +78,7 @@ The trace events are defined on a per-codec basis, e.g.:
 
 .. code-block:: bash
 
-        $ ls /sys/kernel/debug/tracing/events/ | grep visl
+        $ ls /sys/kernel/tracing/events/ | grep visl
         visl_fwht_controls
         visl_h264_controls
         visl_hevc_controls
@@ -90,13 +90,13 @@ For example, in order to dump HEVC SPS data:
 
 .. code-block:: bash
 
-        $ echo 1 >  /sys/kernel/debug/tracing/events/visl_hevc_controls/v4l2_ctrl_hevc_sps/enable
+        $ echo 1 >  /sys/kernel/tracing/events/visl_hevc_controls/v4l2_ctrl_hevc_sps/enable
 
 The SPS data will be dumped to the trace buffer, i.e.:
 
 .. code-block:: bash
 
-        $ cat /sys/kernel/debug/tracing/trace
+        $ cat /sys/kernel/tracing/trace
         video_parameter_set_id 0
         seq_parameter_set_id 0
         pic_width_in_luma_samples 1920
-- 
2.42.0.rc2.253.gd59a3bf2b4-goog