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

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Message-ID: <20190116071321.GA22825@splinter.mtl.com>
Date:   Wed, 16 Jan 2019 07:13:24 +0000
From:   Ido Schimmel <idosch@...lanox.com>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>
CC:     Jiri Pirko <jiri@...lanox.com>,
        "David S. Miller" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next] mlxsw: spectrum_nve: Use struct_size() in
 kzalloc()

On Tue, Jan 15, 2019 at 05:14:29PM -0600, 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 = 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 issue was detected with the help of Coccinelle.
> 
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>

Reviewed-by: Ido Schimmel <idosch@...lanox.com>