Hi Dave,
I wonder if you can take this.
Thanks
--
Gustavo
On 1/8/19 10:13 AM, 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 <gust...@embeddedor.com>
> ---
> arch/sparc/kernel/cpumap.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/arch/sparc/kernel/cpumap.c b/arch/sparc/kernel/cpumap.c
> index d1d52822603d..1cb62bfeaa1f 100644
> --- a/arch/sparc/kernel/cpumap.c
> +++ b/arch/sparc/kernel/cpumap.c
> @@ -194,8 +194,7 @@ static struct cpuinfo_tree *build_cpuinfo_tree(void)
>
> n = enumerate_cpuinfo_nodes(tmp_level);
>
> - new_tree = kzalloc(sizeof(struct cpuinfo_tree) +
> - (sizeof(struct cpuinfo_node) * n), GFP_ATOMIC);
> + new_tree = kzalloc(struct_size(new_tree, nodes, n), GFP_ATOMIC);
> if (!new_tree)
> return NULL;
>
>
