linux-kernel - Re: [oss-drivers] [PATCH][next] nfp: flower: use struct

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Message-ID: <20190605141838.506a453b@cakuba.netronome.com>
Date:   Wed, 5 Jun 2019 14:18:38 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc:     "David S. Miller" <davem@...emloft.net>, oss-drivers@...ronome.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [oss-drivers] [PATCH][next] nfp: flower: use struct_size()
 helper

On Wed, 5 Jun 2019 15:38:27 -0500, 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 nfp_tun_active_tuns {
> 	...
>         struct route_ip_info {
>                 __be32 ipv4;
>                 __be32 egress_port;
>                 __be32 extra[2];
>         } tun_info[];
> };
> 
> Make use of the struct_size() helper instead of an open-coded version
> in order to avoid any potential type mistakes.
> 
> So, replace the following form:
> 
> sizeof(struct nfp_tun_active_tuns) + sizeof(struct route_ip_info) * count
> 
> with:
> 
> struct_size(payload, tun_info, count)
> 
> This code was detected with the help of Coccinelle.
> 
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>

Acked-by: Jakub Kicinski <jakub.kicinski@...ronome.com>

Thanks!