linux-kernel - Re: [PATCH] scripts: dtc: fix a false alarm for node_name_chars

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Message-ID: <7c6f0015-cf50-4c8b-060d-f6641d0aeb16@gmail.com>
Date:   Tue, 31 May 2022 20:45:30 -0500
From:   Frank Rowand <frowand.list@...il.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Qun-Wei Lin <qun-wei.lin@...iatek.com>, matthias.bgg@...il.com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, casper.li@...iatek.com,
        chinwen.chang@...iatek.com, kuan-ying.lee@...iatek.com
Subject: Re: [PATCH] scripts: dtc: fix a false alarm for
 node_name_chars_strict

On 5/31/22 17:49, Rob Herring wrote:
> On Tue, May 31, 2022 at 04:43:18PM -0400, Frank Rowand wrote:
>> On 5/31/22 01:33, Qun-Wei Lin wrote:
>>> The function check_node_name_chars_strict issues a false alarm when
>>> compiling an overlay dts.
>>>
>>> /fragment@..._overlay__: Character '_' not recommended in node name
>>>
>>> This workaround will fix it by skip checking for node named __overlay__.
>>
>> This is not a false alarm.
>>
>> Do not special case node name "__overlay__".  This node name should never
>> occur in a modern overlay source file.
> 
> A dtbo -> dts pass will give warnings, so handling these nodes is 
> worthwhile. Though thinking a bit more about it, I think this one is off 
> by default, but W=2 turns it on.

Yes, at least as of 5.18-rc1 the warning is only if
'-W node_name_chars_strict', so a dtbo -> dts pass will not give the
warning for node __overlay__ by default.

-Frank

> 
> Rob