linux-kernel - Re: [PATCH 1/2] clk: samsung: exynos5260: Move struct samsung_cmu

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Date:   Thu, 25 Aug 2016 23:43:10 +0900
From:   Tomasz Figa <tomasz.figa@...il.com>
To:     Chanwoo Choi <cw00.choi@...sung.com>
Cc:     Stephen Boyd <sboyd@...eaurora.org>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Michael Turquette <mturquette@...libre.com>,
        Kukjin Kim <kgene@...nel.org>,
        Krzysztof Kozłowski <k.kozlowski@...sung.com>,
        chanwoo@...nel.org,
        "linux-samsung-soc@...r.kernel.org" 
        <linux-samsung-soc@...r.kernel.org>, linux-clk@...r.kernel.org,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] clk: samsung: exynos5260: Move struct
 samsung_cmu_info to init section

2016-08-25 16:28 GMT+09:00 Chanwoo Choi <cw00.choi@...sung.com>:
> Hi Stephen,
>
> On 2016년 08월 25일 09:11, Stephen Boyd wrote:
>> On 08/24, Chanwoo Choi wrote:
>>> On 2016년 08월 24일 13:43, Stephen Boyd wrote:
>>>> On 08/23, Sylwester Nawrocki wrote:
>>>>> So the saving is rather insignificant but the patch doesn't make
>>>>> things worse and I'd say it might be worth applying.
>>>>>
>>>>
>>>> Sounds good. This sort of information should be in the commit
>>>> text though. Talking about const doesn't make any sense to me.
>>>
>>> Do you mean that 'const' is initconst secion?
>>
>> No. Marking it as initconst in the patch is correct.
>
> OK.
>
>>
>>> If possible, could you explain the anything
>>> why you don't make sense about 'const'?
>>>
>>
>> I'm just saying that the reasoning to move it from the text
>> section to the data section shouldn't be because of const. There
>> should be better reasons to do this, like size benefits.
>>
>
> As I already said, the samsung_cmu_register_on() requires
> the 'const' type argument for 'struct samsung_cmu_info'.

If a function takes a const pointer as an argument, then it's
perfectly valid to give a non-const pointer. Casting from non-cost
into const is valid, other way around not.

>
> So, I defined the instance on the out of the exynos5260_clk_aud_init() as following:
>         static const struct samsung_cmu_info aud_cmu __initconst = {
>
> How can i add the 'const' keyword and '__initsecion' to the
> "struct samsung_cmu_info aud_cmu" in the "static void __init
> exynos5260_clk_aud_init(struct device_node *np)"?

Stephen meant that there must be some benefit from a change to make it
worth being included into the kernel.

Best regards,
Tomasz