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

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Message-ID: <9c03edf1-564b-dd40-bbdf-e21e499869a6@gmail.com>
Date:   Wed, 24 Jan 2018 22:48:31 -0800
From:   Frank Rowand <frowand.list@...il.com>
To:     Wolfram Sang <wsa+renesas@...g-engineering.com>,
        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>,
        Steven Rostedt <rostedt@...dmis.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v2 0/1] of: easier debugging for node life cycle
 issues

On 01/21/18 06:31, Wolfram Sang wrote:
> 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.

It's been nine months since version 1.  If you are going to include the
dynamic updates part of the patch then please test them.


> 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.

I am OK with the line length warnings in this patch.

Why can't the macro error be fixed?

A file entry needs to be added to MAINTAINERS.


> 
> 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
>