linux-kernel - Re: [PATCH v2] net: stmmac: compare p->des0 and p->des1 with _

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Message-Id: <20230519114652.70372-1-minhuadotchen@gmail.com>
Date:   Fri, 19 May 2023 19:46:52 +0800
From:   Min-Hua Chen <minhuadotchen@...il.com>
To:     simon.horman@...igine.com
Cc:     alexandre.torgue@...s.st.com, davem@...emloft.net,
        edumazet@...gle.com, joabreu@...opsys.com, kuba@...nel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        mcoquelin.stm32@...il.com, minhuadotchen@...il.com,
        netdev@...r.kernel.org, pabeni@...hat.com, peppe.cavallaro@...com
Subject: Re: [PATCH v2] net: stmmac: compare p->des0 and p->des1 with __le32

>On Fri, May 19, 2023 at 07:25:08PM +0800, Min-Hua Chen wrote:
>> Use cpu_to_le32 to convert the constants to __le32 type
>> before comparing them with p->des0 and p->des1 (they are __le32 type)
>> and to fix following sparse warnings:
>> 
>> drivers/net/ethernet/stmicro/stmmac/dwxgmac2_descs.c:110:23: sparse: warning: restricted __le32 degrades to integer
>> drivers/net/ethernet/stmicro/stmmac/dwxgmac2_descs.c:110:50: sparse: warning: restricted __le32 degrades to integer
>> 
>> Signed-off-by: Min-Hua Chen <minhuadotchen@...il.com>
>
>Reviewed-by: Simon Horman <simon.horman@...igine.com>
>
>> ---
>>  drivers/net/ethernet/stmicro/stmmac/dwxgmac2_descs.c | 3 ++-
>>  1 file changed, 2 insertions(+), 1 deletion(-)
>> 
>> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_descs.c b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_descs.c
>> index 13c347ee8be9..eefbeea04964 100644
>> --- a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_descs.c
>> +++ b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_descs.c
>> @@ -107,7 +107,8 @@ static int dwxgmac2_rx_check_timestamp(void *desc)
>>  	ts_valid = !(rdes3 & XGMAC_RDES3_TSD) && (rdes3 & XGMAC_RDES3_TSA);
>>  
>>  	if (likely(desc_valid && ts_valid)) {
>> -		if ((p->des0 == 0xffffffff) && (p->des1 == 0xffffffff))
>> +		if ((p->des0 == cpu_to_le32(0xffffffff)) &&
>> +		    (p->des1 == cpu_to_le32(0xffffffff)))
>
>nit: Sorry for not noticing this in v1.
>     There are unnecessary parentheses (both before and after this change).
>
Thanks, I noticed this before submitting v2 (by checkpath.pl) but I keep
the original parentheses.

I will do v3 with your Reviewed-by tag. :-)

thanks,
Min-Hua