linux-kernel - Re: [PATCH v3 5/6] can: c_can: prepare to up the message objects number

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Message-ID: <20210301130845.3s45ujmhkazscm6x@pengutronix.de>
Date:   Mon, 1 Mar 2021 14:08:45 +0100
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Dario Binacchi <dariobin@...ero.it>
Cc:     linux-kernel@...r.kernel.org,
        Federico Vaga <federico.vaga@...il.com>,
        Oliver Hartkopp <socketcan@...tkopp.net>,
        Vincent Mailhol <mailhol.vincent@...adoo.fr>,
        YueHaibing <yuehaibing@...wei.com>,
        Zhang Qilong <zhangqilong3@...wei.com>,
        linux-can@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH v3 5/6] can: c_can: prepare to up the message objects
 number

On 01.03.2021 12:38:05, Marc Kleine-Budde wrote:
> On 28.02.2021 11:38:54, Dario Binacchi wrote:
> [...]
> 
> > @@ -730,7 +728,7 @@ static void c_can_do_tx(struct net_device *dev)
> >  	while ((idx = ffs(pend))) {
> >  		idx--;
> >  		pend &= ~(1 << idx);
> > -		obj = idx + C_CAN_MSG_OBJ_TX_FIRST;
> > +		obj = idx + priv->msg_obj_tx_first;
> >  		c_can_inval_tx_object(dev, IF_TX, obj);
> >  		can_get_echo_skb(dev, idx, NULL);
> >  		bytes += priv->dlc[idx];
> > @@ -740,7 +738,7 @@ static void c_can_do_tx(struct net_device *dev)
> >  	/* Clear the bits in the tx_active mask */
> >  	atomic_sub(clr, &priv->tx_active);
> >  
> > -	if (clr & (1 << (C_CAN_MSG_OBJ_TX_NUM - 1)))
> > +	if (clr & (1 << (priv->msg_obj_tx_num - 1)))
> 
> Do we need 1UL here, too?

There are several more "1 <<" in the driver. As the right side of the
sift operation can be up to 32, I think you should replace all "1 <<"
with "1UL <<".

regards,
Marc

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