linux-kernel - Re: [PATCH 1/4] rk3399_dmc: Fix line continuation format

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Date:   Thu, 23 Nov 2017 11:12:26 +0900
From:   Chanwoo Choi <cw00.choi@...sung.com>
To:     Joe Perches <joe@...ches.com>, myungjoo.ham@...sung.com,
        Kyungmin Park <kyungmin.park@...sung.com>
Cc:     "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/4] rk3399_dmc: Fix line continuation format

On 2017년 11월 23일 11:07, Joe Perches wrote:
> On Thu, 2017-11-23 at 10:45 +0900, Chanwoo Choi wrote:
>> On 2017년 11월 23일 10:21, MyungJoo Ham wrote:
>>>> On Wed, 2017-11-22 at 14:13 +0900, Chanwoo Choi wrote:
>>>>> On 2017년 11월 17일 00:27, Joe Perches wrote:
>>>>>> Line continuations with excess spacing causes unexpected output.
>>>>>>
>>>>>> Signed-off-by: Joe Perches <joe@...ches.com>
>>>>>> ---
>>>>>>  drivers/devfreq/rk3399_dmc.c | 4 ++--
>>>>>>  1 file changed, 2 insertions(+), 2 deletions(-)
>>>>>>
>>>>>> diff --git a/drivers/devfreq/rk3399_dmc.c b/drivers/devfreq/rk3399_dmc.c
>>>>>> index 5dfbfa3cc878..0938c97d46f0 100644
>>>>>> --- a/drivers/devfreq/rk3399_dmc.c
>>>>>> +++ b/drivers/devfreq/rk3399_dmc.c
>>>>>> @@ -146,8 +146,8 @@ static int rk3399_dmcfreq_target(struct device *dev, unsigned long *freq,
>>>>>>  
>>>>>>  	/* If get the incorrect rate, set voltage to old value. */
>>>>>>  	if (dmcfreq->rate != target_rate) {
>>>>>> -		dev_err(dev, "Get wrong ddr frequency, Request frequency %lu,\
>>>>>> -			Current frequency %lu\n", target_rate, dmcfreq->rate);
>>>>>> +		dev_err(dev, "Get wrong ddr frequency, Request frequency %lu, Current frequency %lu\n",
>>>>>> +			target_rate, dmcfreq->rate);
>>>>>
>>>>> IMO, I don't like over 80 char in the one line.
>>>>
>>>> Fix it as you chose, but the code I proposed
>>>> is what is preferred by CodingStyle.
>>>>
>>>> The current code is unintentional.
>>>>
>>>> Right now there are 3 tabs between "Request frequency"
>>>> and "Current frequency" in the output.
>>>
>>> Chanwoo, this is not a simple coding style issue.
>>> I'm seeing these unintentional tabs as well.
>>>
>>>
>>> If you want to keep it 80 cols with strings (which is r mandatory for strings in double quotes),
>>> We'd better do:
>>>
>>> -		dev_err(dev, "Get wrong ddr frequency, Request frequency %lu,\
>>> -			Current frequency %lu\n", target_rate, dmcfreq->rate);
>>> +		dev_err(dev, "Get wrong ddr frequency, Request frequency %lu,"
>>> +			" Current frequency %lu\n", target_rate, dmcfreq->rate);
>>
>> I agree with Myungjoo's opinion.
>> I think the readability is important. So, I prefer to keep one line within 80 char.
> 
> Read Documentation/process/coding-style.rst
> 
> What I proposed is by far the common style.
> I think you should get used to it.

Read line.81 in the Documentation/process/coding-style.rst
- "2) Breaking long lines and strings"

Or, we better to modify the error message within 80 char.

-- 
Best Regards,
Chanwoo Choi
Samsung Electronics