linux-kernel - Re: [PATCH] drivers/clk: convert VL struct to struct

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Date:   Wed, 2 Oct 2019 14:20:28 -0500
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Stephen Kitt <steve@....org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Paul Burton <paul.burton@...s.com>,
        Paul Cercueil <paul@...pouillou.net>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drivers/clk: convert VL struct to struct_size



On 9/27/19 13:51, Stephen Kitt wrote:
> There are a few manually-calculated variable-length struct allocations
> left, this converts them to use struct_size.
> 

How did you find this?

Please, mention the tool you used to find this in the commit log. With that
you can add my

Acked-by: Gustavo A. R. Silva <gustavo@...eddedor.com>

Thanks
--
Gustavo

> Signed-off-by: Stephen Kitt <steve@....org>
> ---
>  drivers/clk/at91/sckc.c                     | 3 +--
>  drivers/clk/imgtec/clk-boston.c             | 3 +--
>  drivers/clk/ingenic/tcu.c                   | 3 +--
>  drivers/clk/mvebu/ap-cpu-clk.c              | 4 ++--
>  drivers/clk/mvebu/cp110-system-controller.c | 4 ++--
>  drivers/clk/samsung/clk.c                   | 3 +--
>  drivers/clk/uniphier/clk-uniphier-core.c    | 3 +--
>  7 files changed, 9 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/clk/at91/sckc.c b/drivers/clk/at91/sckc.c
> index 9bfe9a28294a..5ad6180449cb 100644
> --- a/drivers/clk/at91/sckc.c
> +++ b/drivers/clk/at91/sckc.c
> @@ -478,8 +478,7 @@ static void __init of_sam9x60_sckc_setup(struct device_node *np)
>  	if (IS_ERR(slow_osc))
>  		goto unregister_slow_rc;
>  
> -	clk_data = kzalloc(sizeof(*clk_data) + (2 * sizeof(struct clk_hw *)),
> -			   GFP_KERNEL);
> +	clk_data = kzalloc(struct_size(clk_data, hws, 2), GFP_KERNEL);
>  	if (!clk_data)
>  		goto unregister_slow_osc;
>  
> diff --git a/drivers/clk/imgtec/clk-boston.c b/drivers/clk/imgtec/clk-boston.c
> index 33ab4ff61165..b00cbd045af5 100644
> --- a/drivers/clk/imgtec/clk-boston.c
> +++ b/drivers/clk/imgtec/clk-boston.c
> @@ -58,8 +58,7 @@ static void __init clk_boston_setup(struct device_node *np)
>  	cpu_div = ext_field(mmcmdiv, BOSTON_PLAT_MMCMDIV_CLK1DIV);
>  	cpu_freq = mult_frac(in_freq, mul, cpu_div);
>  
> -	onecell = kzalloc(sizeof(*onecell) +
> -			  (BOSTON_CLK_COUNT * sizeof(struct clk_hw *)),
> +	onecell = kzalloc(struct_size(onecell, hws, BOSTON_CLK_COUNT),
>  			  GFP_KERNEL);
>  	if (!onecell)
>  		return;
> diff --git a/drivers/clk/ingenic/tcu.c b/drivers/clk/ingenic/tcu.c
> index a1a5f9cb439e..ad7daa494fd4 100644
> --- a/drivers/clk/ingenic/tcu.c
> +++ b/drivers/clk/ingenic/tcu.c
> @@ -358,8 +358,7 @@ static int __init ingenic_tcu_probe(struct device_node *np)
>  		}
>  	}
>  
> -	tcu->clocks = kzalloc(sizeof(*tcu->clocks) +
> -			      sizeof(*tcu->clocks->hws) * TCU_CLK_COUNT,
> +	tcu->clocks = kzalloc(struct_size(tcu->clocks, hws, TCU_CLK_COUNT),
>  			      GFP_KERNEL);
>  	if (!tcu->clocks) {
>  		ret = -ENOMEM;
> diff --git a/drivers/clk/mvebu/ap-cpu-clk.c b/drivers/clk/mvebu/ap-cpu-clk.c
> index af5e5acad370..6b394302c76a 100644
> --- a/drivers/clk/mvebu/ap-cpu-clk.c
> +++ b/drivers/clk/mvebu/ap-cpu-clk.c
> @@ -274,8 +274,8 @@ static int ap_cpu_clock_probe(struct platform_device *pdev)
>  	if (!ap_cpu_clk)
>  		return -ENOMEM;
>  
> -	ap_cpu_data = devm_kzalloc(dev, sizeof(*ap_cpu_data) +
> -				sizeof(struct clk_hw *) * nclusters,
> +	ap_cpu_data = devm_kzalloc(dev, struct_size(ap_cpu_data, hws,
> +						    nclusters),
>  				GFP_KERNEL);
>  	if (!ap_cpu_data)
>  		return -ENOMEM;
> diff --git a/drivers/clk/mvebu/cp110-system-controller.c b/drivers/clk/mvebu/cp110-system-controller.c
> index 808463276145..84c8900542e4 100644
> --- a/drivers/clk/mvebu/cp110-system-controller.c
> +++ b/drivers/clk/mvebu/cp110-system-controller.c
> @@ -235,8 +235,8 @@ static int cp110_syscon_common_probe(struct platform_device *pdev,
>  	if (ret)
>  		return ret;
>  
> -	cp110_clk_data = devm_kzalloc(dev, sizeof(*cp110_clk_data) +
> -				      sizeof(struct clk_hw *) * CP110_CLK_NUM,
> +	cp110_clk_data = devm_kzalloc(dev, struct_size(cp110_clk_data, hws,
> +						       CP110_CLK_NUM),
>  				      GFP_KERNEL);
>  	if (!cp110_clk_data)
>  		return -ENOMEM;
> diff --git a/drivers/clk/samsung/clk.c b/drivers/clk/samsung/clk.c
> index e544a38106dd..dad31308c071 100644
> --- a/drivers/clk/samsung/clk.c
> +++ b/drivers/clk/samsung/clk.c
> @@ -60,8 +60,7 @@ struct samsung_clk_provider *__init samsung_clk_init(struct device_node *np,
>  	struct samsung_clk_provider *ctx;
>  	int i;
>  
> -	ctx = kzalloc(sizeof(struct samsung_clk_provider) +
> -		      sizeof(*ctx->clk_data.hws) * nr_clks, GFP_KERNEL);
> +	ctx = kzalloc(struct_size(ctx, clk_data.hws, nr_clks), GFP_KERNEL);
>  	if (!ctx)
>  		panic("could not allocate clock provider context.\n");
>  
> diff --git a/drivers/clk/uniphier/clk-uniphier-core.c b/drivers/clk/uniphier/clk-uniphier-core.c
> index c6aaca73cf86..12380236d7ab 100644
> --- a/drivers/clk/uniphier/clk-uniphier-core.c
> +++ b/drivers/clk/uniphier/clk-uniphier-core.c
> @@ -64,8 +64,7 @@ static int uniphier_clk_probe(struct platform_device *pdev)
>  	for (p = data; p->name; p++)
>  		clk_num = max(clk_num, p->idx + 1);
>  
> -	hw_data = devm_kzalloc(dev,
> -			sizeof(*hw_data) + clk_num * sizeof(struct clk_hw *),
> +	hw_data = devm_kzalloc(dev, struct_size(hw_data, hws, clk_num),
>  			GFP_KERNEL);
>  	if (!hw_data)
>  		return -ENOMEM;
>