linux-kernel - Re: [PATCH -next] RDMA/mlx5: fix type warning of sizeof in __mlx5_ib_alloc

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Date:   Thu, 17 Sep 2020 12:08:10 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Liu Shixin <liushixin2@...wei.com>
Cc:     Doug Ledford <dledford@...hat.com>, Jason Gunthorpe <jgg@...pe.ca>,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next] RDMA/mlx5: fix type warning of sizeof in
 __mlx5_ib_alloc_counters()

On Thu, Sep 17, 2020 at 05:10:08PM +0800, Liu Shixin wrote:
> sizeof() when applied to a pointer typed expression should give the
> size of the pointed data, even if the data is a pointer.
>
> Signed-off-by: Liu Shixin <liushixin2@...wei.com>
> ---
>  drivers/infiniband/hw/mlx5/counters.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/infiniband/hw/mlx5/counters.c b/drivers/infiniband/hw/mlx5/counters.c
> index 145f3cb40ccb..aeeb14ecb3ee 100644
> --- a/drivers/infiniband/hw/mlx5/counters.c
> +++ b/drivers/infiniband/hw/mlx5/counters.c
> @@ -456,12 +456,12 @@ static int __mlx5_ib_alloc_counters(struct mlx5_ib_dev *dev,
>  		cnts->num_ext_ppcnt_counters = ARRAY_SIZE(ext_ppcnt_cnts);
>  		num_counters += ARRAY_SIZE(ext_ppcnt_cnts);
>  	}
> -	cnts->names = kcalloc(num_counters, sizeof(cnts->names), GFP_KERNEL);
> +	cnts->names = kcalloc(num_counters, sizeof(*cnts->names), GFP_KERNEL);

This change is correct.

>  	if (!cnts->names)
>  		return -ENOMEM;
>
>  	cnts->offsets = kcalloc(num_counters,
> -				sizeof(cnts->offsets), GFP_KERNEL);
> +				sizeof(*cnts->offsets), GFP_KERNEL);

This is not.


>  	if (!cnts->offsets)
>  		goto err_names;
>
> --
> 2.25.1
>