linux-kernel - Re: [PATCH] checkpatch: fix spurious vendor compatible warnings

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Message-ID: <530F9F03.40803@epfl.ch>
Date:	Thu, 27 Feb 2014 21:24:35 +0100
From:	Florian Vaussard <florian.vaussard@...l.ch>
To:	Joe Perches <joe@...ches.com>
CC:	Andy Whitcroft <apw@...onical.com>, Rob Herring <robh@...nel.org>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] checkpatch: fix spurious vendor compatible warnings



On 02/27/2014 09:10 PM, Joe Perches wrote:
> On Thu, 2014-02-27 at 20:56 +0100, Florian Vaussard wrote:
>> With a compatible string like
>>
>> compatible = "foo";
>>
>> checkpatch will currently try to find "foo" in  vendor-prefixes.txt,
>> which is wrong since the vendor prefix is empty in this specific case.
>>
>> Skip the vendor test if the compatible is not like
>>
>> compatible = "vendor,something";
>>
>> Signed-off-by: Florian Vaussard <florian.vaussard@...l.ch>
>> ---
>>  scripts/checkpatch.pl | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
>> index 464dcef..35ec185 100755
>> --- a/scripts/checkpatch.pl
>> +++ b/scripts/checkpatch.pl
>> @@ -2058,6 +2058,7 @@ sub process {
>>  				my $vendor = $compat;
>>  				my $vendor_path = $dt_path . "vendor-prefixes.txt";
>>  				next if (! -f $vendor_path);
>> +				next if not $vendor =~ /^[a-zA-Z0-9]+\,.*/;
>>  				$vendor =~ s/^([a-zA-Z0-9]+)\,.*/$1/;
>>  				`grep -Eq "$vendor" $vendor_path`;
>>  				if ( $? >> 8 ) {
> 
> Some vendor names have dashes.
> I don't know if underscores are allowed.
> 
> $ grep -rP --include=*.[ch] -oh "compatible\s*=\s*\"[^,]+,\w" * | \
>   sed -r -e 's/\s//g' -e 's/,.$//' | sort | uniq -c | grep "[_-]"
>       1 compatible="active-semi
>       8 compatible="asahi-kasei
> 

Good catch. In ePAPR v1.1, I could not find any strict requirement. It
is just saying:

The recommended format is “manufacturer,model”, where manufacturer is a
string describing the name of the manufacturer (such as a stock ticker
symbol), and model specifies the model number.

If I am not mistaking, the stock ticker symbol will not contain exotic
characters, but it is not always available. So we should probably add
the '-. I am not sure for the '_'.

Florian
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