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

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Date:   Thu, 7 Feb 2019 21:49:06 -0600
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Chuck Lever <chuck.lever@...cle.com>
Cc:     Trond Myklebust <trond.myklebust@...merspace.com>,
        Anna Schumaker <anna.schumaker@...app.com>,
        Bruce Fields <bfields@...ldses.org>,
        Jeff Layton <jlayton@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Linux NFS Mailing List <linux-nfs@...r.kernel.org>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] xprtrdma: Use struct_size() in kzalloc()



On 1/31/19 8:11 AM, Chuck Lever wrote:
> 
> 
>> On Jan 30, 2019, at 7:46 PM, Gustavo A. R. Silva <gustavo@...eddedor.com> 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>
> 
> Reviewed-by: Chuck Lever <chuck.lever@...cle.com>
> 

Thanks, Chuck.

--
Gustavo