linux-kernel - Re: [PATCH net-next] nfp: use struct

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Message-ID: <20190130165221.243d37f9@cakuba.hsd1.ca.comcast.net>
Date:   Wed, 30 Jan 2019 16:52:21 -0800
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: [PATCH net-next] nfp: use struct_size() in kzalloc()

On Wed, 30 Jan 2019 18:38:59 -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 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>