linux-kernel - Re: [PATCH v4 12/24] PM / devfreq: tegra30: Inline all one-line functions

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Date:   Fri, 19 Jul 2019 10:24:18 +0900
From:   Chanwoo Choi <cw00.choi@...sung.com>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>,
        linux-pm@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 12/24] PM / devfreq: tegra30: Inline all one-line
 functions

On 19. 7. 19. 오전 10:22, Dmitry Osipenko wrote:
> В Thu, 18 Jul 2019 18:09:05 +0900
> Chanwoo Choi <cw00.choi@...sung.com> пишет:
> 
>> On 19. 7. 16. 오후 10:35, Dmitry Osipenko wrote:
>>> 16.07.2019 15:26, Chanwoo Choi пишет:  
>>>> Hi Dmitry,
>>>>
>>>> I'm not sure that it is necessary.
>>>> As I knew, usally, the 'inline' is used on header file
>>>> to define the empty functions.
>>>>
>>>> Do we have to change it with 'inline' keyword?  
>>>
>>> The 'inline' attribute tells compiler that instead of jumping into
>>> the function, it should take the function's code and replace the
>>> function's invocation with that code. This is done in order to help
>>> compiler optimize code properly, please see [1]. There is
>>> absolutely no need to create a function call into a function that
>>> consists of a single instruction.
>>>
>>> [1] https://gcc.gnu.org/onlinedocs/gcc-9.1.0/gcc/Inline.html
>>>   
>>
>> If you want to add 'inline' keyword, I recommend that 
>> you better to remove the modified function in this patch
>> and then just call the 'write_relaxed or read_relaxed' function
>> directly. It is same result when using inline keyword.
> 
> That could be done, but it makes code less readable.
> 
> See the difference:
> 
> device_writel(dev, ACTMON_INTR_STATUS_CLEAR, ACTMON_DEV_INTR_STATUS);
> 
> writel_relaxed(ACTMON_INTR_STATUS_CLEAR,
> 	       dev->regs + ACTMON_DEV_INTR_STATUS);

No problem if you add the detailed comment and you want to use
the 'inline' keyword.

> 
> 
> 


-- 
Best Regards,
Chanwoo Choi
Samsung Electronics