linux-kernel - Re: [PATCH] i2c: mux: Use struct_size() in devm

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Message-ID: <a7851536-52dc-367e-ffc2-88f49f96bd00@axentia.se>
Date:   Tue, 11 Jun 2019 07:12:04 +0000
From:   Peter Rosin <peda@...ntia.se>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Wolfram Sang <wsa@...-dreams.de>
CC:     "linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] i2c: mux: Use struct_size() in devm_kzalloc()

On 2019-05-29 18:20, 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;
>     struct boo entry[];
> };
> 
> instance = devm_kzalloc(dev, sizeof(struct foo) + count * sizeof(struct boo), GFP_KERNEL);
> 
> Instead of leaving these open-coded and prone to type mistakes, we can
> now use the new struct_size() helper:
> 
> instance = devm_kzalloc(dev, struct_size(instance, entry, count), GFP_KERNEL);
> 
> This code was detected with the help of Coccinelle.

Thanks, patch applied to i2c-mux/for-next

Cheers,
Peter