linux-kernel - [RFC PATCH v2 0/1] of: easier debugging for node life cycle issues

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Message-Id: <20180121143117.19805-1-wsa+renesas@sang-engineering.com>
Date:   Sun, 21 Jan 2018 15:31:16 +0100
From:   Wolfram Sang <wsa+renesas@...g-engineering.com>
To:     devicetree@...r.kernel.org
Cc:     Tyrel Datwyler <tyreld@...ux.vnet.ibm.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        linux-renesas-soc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        linux-kernel@...r.kernel.org,
        Wolfram Sang <wsa+renesas@...g-engineering.com>
Subject: [RFC PATCH v2 0/1] of: easier debugging for node life cycle issues

I got a bug report for a DT node refcounting problem in the I2C subsystem. This
patch was a huge help in validating the bug report and the proposed solution.
So, I thought I bring it to attention again. Thanks Tyrel, for the initial
work!

Note that I did not test the dynamic updates, only of_node_{get|put} so far. I
read that Tyrel checked dynamic updates extensively with this patch. And since
DT overlays are also used within our Renesas dev team, this will help there, as
well.

Tested on a Renesas Salvator-XS board (R-Car H3).

Changes since RFC v1:
	* rebased to v4.15-rc8
	* fixed commit abbrev and one of the sysfs paths in commit desc
	* removed trailing space and fixed pointer declaration in code

I consider all the remaining checkpatch issues irrelevant for this patch.

So what about applying it?

Kind regards,

   Wolfram

Tyrel Datwyler (1):
  of: introduce event tracepoints for dynamic device_node lifecyle

 drivers/of/dynamic.c      | 32 ++++++----------
 include/trace/events/of.h | 93 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 105 insertions(+), 20 deletions(-)
 create mode 100644 include/trace/events/of.h

-- 
2.11.0