linux-kernel - Re: [PATCH net-next] mlxsw: spectrum_router: Use struct

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Message-Id: <20190208.225839.1381803240249892208.davem@davemloft.net>
Date:   Fri, 08 Feb 2019 22:58:39 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     gustavo@...eddedor.com
Cc:     jiri@...lanox.com, idosch@...lanox.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] mlxsw: spectrum_router: Use struct_size() in
 kzalloc()

From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Date: Thu, 7 Feb 2019 21:42:41 -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[];
> };
> 
> size = sizeof(struct foo) + count * sizeof(struct boo);
> instance = kzalloc(size, 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)
> 
> Notice that, in this case, variable alloc_size is not necessary, hence
> it is removed.
> 
> This code was detected with the help of Coccinelle.
> 
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>

Applied.