linux-kernel - Re: [PATCH net-next] cxgb4/l2t: Use struct

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Message-Id: <20190116.211153.2129962135276201404.davem@davemloft.net>
Date:   Wed, 16 Jan 2019 21:11:53 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     gustavo@...eddedor.com
Cc:     arjun@...lsio.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] cxgb4/l2t: Use struct_size() in kvzalloc()

From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Date: Tue, 15 Jan 2019 15:44:52 -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 = kvzalloc(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 = kvzalloc(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.