linux-kernel - Re: [PATCH 1/3] net: macb: check constant to define and fix _

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Date:   Fri, 23 Jun 2023 10:40:52 +0100
From:   Ben Dooks <ben.dooks@...ethink.co.uk>
To:     Simon Horman <simon.horman@...igine.com>
Cc:     netdev@...r.kernel.org, pabeni@...hat.com, kuba@...nel.org,
        edumazet@...gle.com, davem@...emloft.net,
        linux-kernel@...r.kernel.org, claudiu.beznea@...rochip.com,
        nicolas.ferre@...rochip.com
Subject: Re: [PATCH 1/3] net: macb: check constant to define and fix __be32
 warnings



On 2023-06-22 16:49, Simon Horman wrote:
> On Thu, Jun 22, 2023 at 02:05:05PM +0100, Ben Dooks wrote:
>> The checks on ipv4 addresses in the filtering code check against
>> a constant of 0xFFFFFFFF, so replace it with MACB_IPV4_MASK and
>> then make sure it is of __be32 type to avoid the following
>> sparse warnigns:
>> 
>> drivers/net/ethernet/cadence/macb_main.c:3448:39: warning: restricted 
>> __be32 degrades to integer
>> drivers/net/ethernet/cadence/macb_main.c:3453:39: warning: restricted 
>> __be32 degrades to integer
>> drivers/net/ethernet/cadence/macb_main.c:3483:20: warning: restricted 
>> __be32 degrades to integer
>> drivers/net/ethernet/cadence/macb_main.c:3497:20: warning: restricted 
>> __be32 degrades to integer
>> 
>> Signed-off-by: Ben Dooks <ben.dooks@...ethink.co.uk>
>> ---
>>  drivers/net/ethernet/cadence/macb_main.c | 10 ++++++----
>>  1 file changed, 6 insertions(+), 4 deletions(-)
>> 
>> diff --git a/drivers/net/ethernet/cadence/macb_main.c 
>> b/drivers/net/ethernet/cadence/macb_main.c
>> index f20ec0d5260b..538d4c7e023b 100644
>> --- a/drivers/net/ethernet/cadence/macb_main.c
>> +++ b/drivers/net/ethernet/cadence/macb_main.c
>> @@ -3418,6 +3418,8 @@ static int macb_get_ts_info(struct net_device 
>> *netdev,
>>  	return ethtool_op_get_ts_info(netdev, info);
>>  }
>> 
>> +#define MACB_IPV4_MASK htonl(0xFFFFFFFF)
>> +
> 
> Hi Ben,
> 
> according to a recent thread, it seems that the preferred approach 
> might be
> ~(__le32)0.
> 
> https://lore.kernel.org/netdev/20230522153615.247577-1-minhuadotchen@gmail.com/

Out of interest, should we keep the define then or simply go through 
changing
all the places where change is needed?

-- 
Ben