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Date:   Tue, 29 Jan 2019 10:57:24 -0800 (PST)
Message-Id: <20190129.105724.1719800687435588791.davem@davemloft.net>
To:     gustavo@embeddedor.com
Cc:     arjun@chelsio.com, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH net-next] cxgb4: cxgb4_tc_u32: use struct_size() in
 kvzalloc()
From:   David Miller <davem@davemloft.net>
In-Reply-To: <20190129170523.GA29824@embeddedor>
References: <20190129170523.GA29824@embeddedor>
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From: "Gustavo A. R. Silva" <gustavo@embeddedor.com>
Date: Tue, 29 Jan 2019 11:05:23 -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@embeddedor.com>

Applied, thanks.