linux-kernel - Re: [PATCH][next] i40e: Use struct

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Message-ID: <51444c930eb77df0acfdbd354ef003b81e6c6b66.camel@intel.com>
Date:   Fri, 29 Mar 2019 15:36:58 -0700
From:   Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        "David S. Miller" <davem@...emloft.net>
Cc:     intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] i40e: Use struct_size() in kzalloc()

On Thu, 2019-03-28 at 12:52 -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 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 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>
> ---
>  drivers/net/ethernet/intel/i40e/i40e_client.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)

Thanks Gustavo, I will queue this up.

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