linux-kernel - Re: [PATCH] IB/core: Use struct

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Message-ID: <20190107190006.GA23891@ziepe.ca>
Date:   Mon, 7 Jan 2019 12:00:06 -0700
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc:     Doug Ledford <dledford@...hat.com>, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] IB/core: Use struct_size() in kzalloc()

On Fri, Jan 04, 2019 at 12:15:58PM -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;
>     void *entry[];
> };
> 
> instance = kzalloc(sizeof(struct foo) + sizeof(void *) * count, 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>
> ---
>  drivers/infiniband/core/sa_query.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)

Applied to for-next, thanks

Jason