linux-kernel - Re: [PATCH 1/3] of: base: add support to get machine compatible string

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Date:   Wed, 23 Nov 2016 17:43:09 +0530
From:   Sekhar Nori <nsekhar@...com>
To:     Sudeep Holla <sudeep.holla@....com>
CC:     Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Kevin Hilman <khilman@...libre.com>,
        Michael Turquette <mturquette@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        Peter Ujfalusi <peter.ujfalusi@...com>,
        Russell King <linux@...linux.org.uk>,
        LKML <linux-kernel@...r.kernel.org>,
        arm-soc <linux-arm-kernel@...ts.infradead.org>,
        linux-drm <dri-devel@...ts.freedesktop.org>,
        linux-devicetree <devicetree@...r.kernel.org>,
        Jyri Sarha <jsarha@...com>,
        Tomi Valkeinen <tomi.valkeinen@...com>,
        David Airlie <airlied@...ux.ie>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Robin Murphy <robin.murphy@....com>
Subject: Re: [PATCH 1/3] of: base: add support to get machine compatible
 string

On Wednesday 23 November 2016 05:37 PM, Sudeep Holla wrote:
>> So, the if(!of_node_get()) is just an expensive NULL pointer check. I
>> think
>> it is better to be explicit about it by not using of_node_get/put() at
>> all.
>> How about:
>>
> 
> Are we planning to use this in any time sensitive paths? Anyways I am
> fine removing them.

Not worried about the time taken as much as it serving as a bad example
and getting carried over to other places where the impact might actually
be real.

> 
>> +int of_machine_get_model_name(const char **model)
>> +{
>> +       int error;
>> +
>> +       if (!of_root)
>> +               return -EINVAL;
>> +
>> +       error = of_property_read_string(of_root, "model", model);
>> +       if (error)
>> +               error = of_property_read_string_index(of_root,
>> "compatible",
>> +                                                     0, model);
>> +       return error;
>> +}
>> +EXPORT_SYMBOL(of_machine_get_model_name);
>>
>> I know the patch is already in -next so I guess it depends on how
>> strongly
>> Rob feels about this.
> 
> Frank expressed his concerns and it may be reverted.

Didn't notice that. I will check that thread. Thanks!

Regards,
Sekhar