netdev - Re: [PATCH v2 2/2] checkpatch: suggest using eth_zero_addr() and eth_broadcast

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Date:	Tue, 21 Apr 2015 22:57:54 +0200
From:	Mateusz Kulikowski <mateusz.kulikowski@...il.com>
To:	Joe Perches <joe@...ches.com>
CC:	apw@...onical.com, davem@...emloft.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] checkpatch: suggest using eth_zero_addr() and
 eth_broadcast_addr()

Hi Joe, 

On 20.04.2015 03:13, Joe Perches wrote:
> On Mon, 2015-04-20 at 00:16 +0200, Mateusz Kulikowski wrote:
>> Suggest using eth_zero_addr() or eth_broadcast_addr() instead of memset().
> 
> Hi again Mateusz
> 
>> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> []
>> @@ -5042,6 +5042,22 @@ sub process {
>>  			     "Prefer ether_addr_equal() or ether_addr_equal_unaligned() over memcmp()\n" . $herecurr)
>>  		}
>>  
>> +# check for memset(foo, 0x0, ETH_ALEN) that could be eth_zero_addr
>> +# check for memset(foo, 0xFF, ETH_ALEN) that could be eth_broadcast_addr
>> +		if ($^V && $^V ge 5.10.0 &&
>> +		    $line =~ /^\+(?:.*?)\bmemset\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\,\s*ETH_ALEN\s*\)/s) {
> 
> Because you are working with $line and not $stat,
> the last /s isn't useful here.
> 
> $line is always a single line.

Perhaps it would be smarter to use (for both patches) $stat instead.
This applies also to existing checks (like PREFER_ETHER_ADDR_COPY) 
so we can catch calls formatted like

memset(very.long.structure->something.something_different42,
       0xFF, ETH_ALEN);


Regards,
Mateusz
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