linux-kernel - Re: [PATCH] Staging: rtl8192e: make sizeof type-independent

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Date:   Tue, 21 Jun 2022 18:02:05 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Felix Schlepper <f3sch.git@...look.com>
Cc:     gregkh@...uxfoundation.org, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Staging: rtl8192e: make sizeof type-independent

On Tue, Jun 21, 2022 at 04:58:45PM +0200, Felix Schlepper wrote:
> Making sizeof operator type-independent.
> 
> Reported by checkpatch:
> 
> CHECK: Prefer kmalloc(sizeof(*txb)...) over
>         kmalloc(sizeof(struct rtllib_txb)...)
> 
> ---
> Note: First patch, trying to follow kernelnewbies tutorial.
> 
> Signed-off-by: Felix Schlepper <f3sch.git@...look.com>
> ---
>  drivers/staging/rtl8192e/rtllib_tx.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/staging/rtl8192e/rtllib_tx.c b/drivers/staging/rtl8192e/rtllib_tx.c
> index 37715afb0210..01e163e61f0e 100644
> --- a/drivers/staging/rtl8192e/rtllib_tx.c
> +++ b/drivers/staging/rtl8192e/rtllib_tx.c
> @@ -205,8 +205,7 @@ static struct rtllib_txb *rtllib_alloc_txb(int nr_frags, int txb_size,
>  	struct rtllib_txb *txb;
>  	int i;
>  
> -	txb = kmalloc(sizeof(struct rtllib_txb) + (sizeof(u8 *) * nr_frags),
> -		      gfp_mask);
> +	txb = kmalloc(sizeof(*txb) + (sizeof(u8 *) * nr_frags), gfp_mask);

Use the struct_size() macro instead.

regards,
dan carpenter