linux-kernel - Re: [PATCH net-next] net: aquantia: Fix build error wihtout CONFIG_PTP_1588

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Message-ID: <4edcf4c4-b8fc-00a1-5f13-6c41a27eb4a5@huawei.com>
Date:   Sat, 26 Oct 2019 16:57:44 +0800
From:   Yuehaibing <yuehaibing@...wei.com>
To:     Simon Horman <simon.horman@...ronome.com>
CC:     <epomozov@...vell.com>, <igor.russkikh@...antia.com>,
        <davem@...emloft.net>, <dmitry.bezrukov@...antia.com>,
        <sergey.samoilenko@...antia.com>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next] net: aquantia: Fix build error wihtout
 CONFIG_PTP_1588_CLOCK

On 2019/10/26 16:09, Simon Horman wrote:
> On Fri, Oct 25, 2019 at 09:37:26PM +0800, YueHaibing wrote:
>> If PTP_1588_CLOCK is n, building fails:
>>
>> drivers/net/ethernet/aquantia/atlantic/aq_ptp.c: In function aq_ptp_adjfine:
>> drivers/net/ethernet/aquantia/atlantic/aq_ptp.c:279:11:
>>  error: implicit declaration of function scaled_ppm_to_ppb [-Werror=implicit-function-declaration]
>>            scaled_ppm_to_ppb(scaled_ppm));
>>
>> Just cp scaled_ppm_to_ppb() from ptp_clock.c to fix this.
>>
>> Fixes: 910479a9f793 ("net: aquantia: add basic ptp_clock callbacks")
>> Signed-off-by: YueHaibing <yuehaibing@...wei.com>
> 
> Hi YueHaibing,
> 
> thanks for your patch.
> 
> What is the motivation for not using the existing copy of this function?

I'm not sure if PTP_1588_CLOCK is needed at this config,
using the existing function need to PTP_1588_CLOCK is selected.

> 
>> ---
>>  drivers/net/ethernet/aquantia/atlantic/aq_ptp.c | 20 ++++++++++++++++++++
>>  1 file changed, 20 insertions(+)
>>
>> diff --git a/drivers/net/ethernet/aquantia/atlantic/aq_ptp.c b/drivers/net/ethernet/aquantia/atlantic/aq_ptp.c
>> index 3ec0841..80c001d 100644
>> --- a/drivers/net/ethernet/aquantia/atlantic/aq_ptp.c
>> +++ b/drivers/net/ethernet/aquantia/atlantic/aq_ptp.c
>> @@ -262,6 +262,26 @@ static void aq_ptp_tx_timeout_check(struct aq_ptp_s *aq_ptp)
>>  	}
>>  }
>>  
>> +static s32 scaled_ppm_to_ppb(long ppm)
>> +{
>> +	/*
>> +	 * The 'freq' field in the 'struct timex' is in parts per
>> +	 * million, but with a 16 bit binary fractional field.
>> +	 *
>> +	 * We want to calculate
>> +	 *
>> +	 *    ppb = scaled_ppm * 1000 / 2^16
>> +	 *
>> +	 * which simplifies to
>> +	 *
>> +	 *    ppb = scaled_ppm * 125 / 2^13
>> +	 */
>> +	s64 ppb = 1 + ppm;
>> +	ppb *= 125;
>> +	ppb >>= 13;
>> +	return (s32) ppb;
>> +}
>> +
>>  /* aq_ptp_adjfine
>>   * @ptp: the ptp clock structure
>>   * @ppb: parts per billion adjustment from base
>> -- 
>> 2.7.4
>>
>>
> 
> .
>