linux-kernel - Re: [PATCH 15/42] drivers/ptp: Convert snprintf to sysfs

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Date: Tue, 16 Jan 2024 05:52:14 +0000
From: "Zhijian Li (Fujitsu)" <lizhijian@...itsu.com>
To: Rahul Rameshbabu <rrameshbabu@...dia.com>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Richard
 Cochran <richardcochran@...il.com>, "netdev@...r.kernel.org"
	<netdev@...r.kernel.org>
Subject: Re: [PATCH 15/42] drivers/ptp: Convert snprintf to sysfs_emit



On 16/01/2024 13:01, Rahul Rameshbabu wrote:
> On Tue, 16 Jan, 2024 12:51:24 +0800 Li Zhijian <lizhijian@...itsu.com> wrote:
>> Per filesystems/sysfs.rst, show() should only use sysfs_emit()
>> or sysfs_emit_at() when formatting the value to be returned to user space.
>>
>> coccinelle complains that there are still a couple of functions that use
>> snprintf(). Convert them to sysfs_emit().
>>
>>> ./drivers/ptp/ptp_sysfs.c:27:8-16: WARNING: please use sysfs_emit
>>
>> No functional change intended
>>
>> CC: Richard Cochran <richardcochran@...il.com>
>> CC: netdev@...r.kernel.org
>> Signed-off-by: Li Zhijian <lizhijian@...itsu.com>
>> ---
>>   drivers/ptp/ptp_sysfs.c | 3 +--
>>   1 file changed, 1 insertion(+), 2 deletions(-)
>>
>> diff --git a/drivers/ptp/ptp_sysfs.c b/drivers/ptp/ptp_sysfs.c
>> index f7a499a1bd39..49737ed6ef5f 100644
>> --- a/drivers/ptp/ptp_sysfs.c
>> +++ b/drivers/ptp/ptp_sysfs.c
>> @@ -24,8 +24,7 @@ static ssize_t max_phase_adjustment_show(struct device *dev,
>>   {
>>   	struct ptp_clock *ptp = dev_get_drvdata(dev);
>>   
>> -	return snprintf(page, PAGE_SIZE - 1, "%d\n",
>> -			ptp->info->getmaxphase(ptp->info));
>> +	return sysfs_emit(page, "%d\n", ptp->info->getmaxphase(ptp->info));
>>   }
>>   static DEVICE_ATTR_RO(max_phase_adjustment);
> 
> I authored the lines that are being changed here, so figured I should
> provide my review. Doesn't PTP_SHOW_INT in the same file also use
> snprintf in the same manner and should be changed to sysfs_emit?

Thanks for you review.
Yes, i think so, beside PTP_SHOW_INT, there are 3 other places not detected by coccinelle should be fixed.
I will update it in V2.

$ grep snprintf drivers/ptp/ptp_sysfs.c
         return snprintf(page, PAGE_SIZE-1, "%d\n", ptp->info->var);     \
         cnt = snprintf(page, PAGE_SIZE, "%u %lld %u\n",
         size = snprintf(page, PAGE_SIZE - 1, "%u\n", ptp->n_vclocks);
         size = snprintf(page, PAGE_SIZE - 1, "%u\n", ptp->max_vclocks);


Thanks
Zhijian


> 
> --
> Thanks,
> 
> Rahul Rameshbabu