linux-kernel - Re: powerpc/spufs: use struct

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Date:   Thu, 24 Jan 2019 14:40:19 +1100 (AEDT)
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Jeremy Kerr <jk@...abs.org>, Arnd Bergmann <arnd@...db.de>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Subject: Re: powerpc/spufs: use struct_size() in kmalloc()

On Tue, 2019-01-08 at 18:37:20 UTC, "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 = kmalloc(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 = kmalloc(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>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/00def7130af8b3fad1bdef98429c94a6

cheers