linux-kernel - Re: [PATCH v4 5/6] can: c_can: prepare to up the message objects number

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Message-ID: <1019942000.124735.1614942841458@mail1.libero.it>
Date:   Fri, 5 Mar 2021 12:14:01 +0100 (CET)
From:   Dario Binacchi <dariobin@...ero.it>
To:     Marc Kleine-Budde <mkl@...gutronix.de>
Cc:     linux-kernel@...r.kernel.org,
        Alexander Stein <alexander.stein@...tec-electronic.com>,
        Federico Vaga <federico.vaga@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Oliver Hartkopp <socketcan@...tkopp.net>,
        Vincent Mailhol <mailhol.vincent@...adoo.fr>,
        Wolfgang Grandegger <wg@...ndegger.com>,
        YueHaibing <yuehaibing@...wei.com>,
        Zhang Qilong <zhangqilong3@...wei.com>,
        linux-can@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH v4 5/6] can: c_can: prepare to up the message objects
 number


> Il 04/03/2021 16:26 Marc Kleine-Budde <mkl@...gutronix.de> ha scritto:
> 
>  
> On 02.03.2021 22:54:34, Dario Binacchi wrote:
> > diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
> > index 77b9aee56154..0052ba5197e0 100644
> > --- a/drivers/net/can/c_can/c_can.c
> > +++ b/drivers/net/can/c_can/c_can.c
> [...]
> > -struct net_device *alloc_c_can_dev(void)
> > +struct net_device *alloc_c_can_dev(int msg_obj_num)
> >  {
> >  	struct net_device *dev;
> >  	struct c_can_priv *priv;
> > +	int msg_obj_tx_num = msg_obj_num / 2;
> >  
> > -	dev = alloc_candev(sizeof(struct c_can_priv), C_CAN_MSG_OBJ_TX_NUM);
> > +	dev = alloc_candev(sizeof(*priv) + sizeof(u32) * msg_obj_tx_num,
> > +			   msg_obj_tx_num);
> 
> I've converted this to make use of the struct_size() macro:
> 
> +       dev = alloc_candev(struct_size(priv, dlc, msg_obj_tx_num),
> +                          msg_obj_tx_num);
> 

Nice!
I learned a new thing.

Thanks and regards,
Dario

> regards,
> Marc
> 
> -- 
> Pengutronix e.K.                 | Marc Kleine-Budde           |
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