linux-kernel - Re: [PATCH net-next] nfp: use struct

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Message-Id: <20190201.151312.1302495749109758446.davem@davemloft.net>
Date:   Fri, 01 Feb 2019 15:13:12 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     gustavo@...eddedor.com
Cc:     jakub.kicinski@...ronome.com, oss-drivers@...ronome.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] nfp: use struct_size() in kzalloc()

From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Date: Wed, 30 Jan 2019 18:38:59 -0600

> 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 = kzalloc(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 = kzalloc(struct_size(instance, entry, count), GFP_KERNEL);
> 
> This code was detected with the help of Coccinelle.
> 
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>

Applied.