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

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Message-ID: <20210301194550.6zqmxzcwvzlgjzcj@pengutronix.de>
Date:   Mon, 1 Mar 2021 20:45:50 +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>,
        Alexander Stein <alexander.stein@...tec-electronic.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 v3 5/6] can: c_can: prepare to up the message objects
 number

On 01.03.2021 18:21:42, 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?
> 
> Do you agree if I use the BIT macro ?

No, please use GENMASK(priv->msg_obj_tx_num, 0) here.

regrads,
Marc

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