linux-kernel - Re: [PATCH] clk: imx: imx7ulp: use struct

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Message-ID: <18969a9a-f9e1-e301-9f17-d1e3ab301dbd@embeddedor.com>
Date:   Mon, 14 Jan 2019 10:44:37 -0600
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <fabio.estevam@....com>,
        NXP Linux Team <linux-imx@....com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clk: imx: imx7ulp: use struct_size() in kzalloc()

Hi,

Friendly ping:

Who can take this?

Thanks
--
Gustavo

On 12/24/18 12:40 AM, Gustavo A. R. Silva wrote:
> One of the more common cases of allocation size calculations is finding
> the size of a structure that has a zero-sized array at the end, along
> with memory for some number of elements for that array. For example:
> 
> struct foo {
>      int stuff;
>      void *entry[];
> };
> 
> instance = kzalloc(sizeof(struct foo) + sizeof(void *) * count, GFP_KERNEL);
> 
> Instead of leaving these open-coded and prone to type mistakes, we can
> now use the new struct_size() helper:
> 
> instance = kzalloc(struct_size(instance, entry, count), GFP_KERNEL);
> 
> This issue was detected with the help of Coccinelle.
> 
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
> ---
>   drivers/clk/imx/clk-imx7ulp.c | 16 ++++++++--------
>   1 file changed, 8 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/clk/imx/clk-imx7ulp.c b/drivers/clk/imx/clk-imx7ulp.c
> index 4e18f629f823..ce306631e844 100644
> --- a/drivers/clk/imx/clk-imx7ulp.c
> +++ b/drivers/clk/imx/clk-imx7ulp.c
> @@ -48,8 +48,8 @@ static void __init imx7ulp_clk_scg1_init(struct device_node *np)
>   	struct clk_hw **clks;
>   	void __iomem *base;
>   
> -	clk_data = kzalloc(sizeof(*clk_data) + sizeof(*clk_data->hws) *
> -			   IMX7ULP_CLK_SCG1_END, GFP_KERNEL);
> +	clk_data = kzalloc(struct_size(clk_data, hws, IMX7ULP_CLK_SCG1_END),
> +			   GFP_KERNEL);
>   	if (!clk_data)
>   		return;
>   
> @@ -136,8 +136,8 @@ static void __init imx7ulp_clk_pcc2_init(struct device_node *np)
>   	struct clk_hw **clks;
>   	void __iomem *base;
>   
> -	clk_data = kzalloc(sizeof(*clk_data) + sizeof(*clk_data->hws) *
> -			   IMX7ULP_CLK_PCC2_END, GFP_KERNEL);
> +	clk_data = kzalloc(struct_size(clk_data, hws, IMX7ULP_CLK_PCC2_END),
> +			   GFP_KERNEL);
>   	if (!clk_data)
>   		return;
>   
> @@ -183,8 +183,8 @@ static void __init imx7ulp_clk_pcc3_init(struct device_node *np)
>   	struct clk_hw **clks;
>   	void __iomem *base;
>   
> -	clk_data = kzalloc(sizeof(*clk_data) + sizeof(*clk_data->hws) *
> -			   IMX7ULP_CLK_PCC3_END, GFP_KERNEL);
> +	clk_data = kzalloc(struct_size(clk_data, hws, IMX7ULP_CLK_PCC3_END),
> +			   GFP_KERNEL);
>   	if (!clk_data)
>   		return;
>   
> @@ -228,8 +228,8 @@ static void __init imx7ulp_clk_smc1_init(struct device_node *np)
>   	struct clk_hw **clks;
>   	void __iomem *base;
>   
> -	clk_data = kzalloc(sizeof(*clk_data) + sizeof(*clk_data->hws) *
> -			   IMX7ULP_CLK_SMC1_END, GFP_KERNEL);
> +	clk_data = kzalloc(struct_size(clk_data, hws, IMX7ULP_CLK_SMC1_END),
> +			   GFP_KERNEL);
>   	if (!clk_data)
>   		return;
>   
>