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

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Message-ID: <20160824044346.GR6502@codeaurora.org>
Date:   Tue, 23 Aug 2016 21:43:46 -0700
From:   Stephen Boyd <sboyd@...eaurora.org>
To:     Sylwester Nawrocki <s.nawrocki@...sung.com>
Cc:     Chanwoo Choi <cw00.choi@...sung.com>, tomasz.figa@...il.com,
        mturquette@...libre.com, kgene@...nel.org, k.kozlowski@...sung.com,
        chanwoo@...nel.org, linux-samsung-soc@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] clk: samsung: exynos5260: Move struct
 samsung_cmu_info to init section

On 08/23, Sylwester Nawrocki wrote:
> On 08/23/2016 04:35 AM, Chanwoo Choi wrote:
> I checked stripped object files and it seems with the patch there
> is some saving of the kernel image size. Exactly 784 bytes, which
> makes zImage smaller by 480 bytes.
> 
> The patch increases .init.rodata section size by 780 bytes but 
> decreases .init.text section size by 1564 bytes.  Looks like 
> a static initializer is cheaper.
> 
> $ ls -l  drivers/clk/samsung/clk-exynos5260.o
> 
> < -rw-rw-r-- 1 snawrocki snawrocki 29100 Aug 23 11:35 drivers/clk/samsung/clk-exynos5260.o
> ---
> > -rw-rw-r-- 1 snawrocki snawrocki 28316 Aug 23 11:32 drivers/clk/samsung/clk-exynos5260.o
> 
> 
> The section size differences are as below:
> 15c15
> <   3 .init.text    000006b8  00000000  00000000  00000034  2**2
> ---
> >   3 .init.text    0000009c  00000000  00000000  00000034  2**2
> 25c25
> <   8 .init.rodata  00003f6c  00000000  00000000  00002f20  2**2
> ---
> >   8 .init.rodata  00004278  00000000  00000000  00002904  2**2
> 
> 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.

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