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

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Date:   Mon, 22 Aug 2016 17:55:12 -0700
From:   Stephen Boyd <sboyd@...eaurora.org>
To:     Chanwoo Choi <cw00.choi@...sung.com>
Cc:     s.nawrocki@...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 08/22, Chanwoo Choi wrote:
> This patch moves the all samsung_cmu_info struct to initconst section
> because they are used only in initconst section.
> 
> Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
> ---
>  drivers/clk/samsung/clk-exynos5260.c | 350 +++++++++++++++++------------------
>  1 file changed, 175 insertions(+), 175 deletions(-)
> 
> diff --git a/drivers/clk/samsung/clk-exynos5260.c b/drivers/clk/samsung/clk-exynos5260.c
> index a43642c36039..fd1d9bfc151b 100644
> --- a/drivers/clk/samsung/clk-exynos5260.c
> +++ b/drivers/clk/samsung/clk-exynos5260.c
> @@ -131,21 +131,21 @@ static const struct samsung_gate_clock aud_gate_clks[] __initconst = {
>  			EN_IP_AUD, 4, 0, 0),
>  };
>  
> +static const struct samsung_cmu_info aud_cmu __initconst = {
> +	.mux_clks	= aud_mux_clks,
> +	.nr_mux_clks	= ARRAY_SIZE(aud_mux_clks),
> +	.div_clks	= aud_div_clks,
> +	.nr_div_clks	= ARRAY_SIZE(aud_div_clks),
> +	.gate_clks	= aud_gate_clks,
> +	.nr_gate_clks	= ARRAY_SIZE(aud_gate_clks),
> +	.nr_clk_ids	= AUD_NR_CLK,
> +	.clk_regs	= aud_clk_regs,
> +	.nr_clk_regs	= ARRAY_SIZE(aud_clk_regs),
> +};
> +
>  static void __init exynos5260_clk_aud_init(struct device_node *np)
>  {
> -	struct samsung_cmu_info cmu = { NULL };
> -

I presume this was done this way to save some initdata space by
only allocating the array that's needed at runtime? I would
expect to see some more kernel image bloat from this change but
runtime memory usage would stay the same. Is there any real
benefit from this patch though?

-- 
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