From mboxrd@z Thu Jan  1 00:00:00 1970
From: Joe Perches <joe@perches.com>
Subject: Re: [PATCH net-next] net: macb: replace literal constant with
 NET_IP_ALIGN
Date: Wed, 01 Jul 2015 10:06:29 -0700
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Cc: Nicolae Rosia <nicolae.rosia@certsign.ro>, netdev@vger.kernel.org,
	'Nicolas Ferre <nicolas.ferre@atmel.com>
To: Eric Dumazet <eric.dumazet@gmail.com>
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On Wed, 2015-07-01 at 12:56 +0200, Eric Dumazet wrote:
> On Tue, 2015-06-30 at 20:25 +0300, Nicolae Rosia wrote:
> > diff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c
[]
> > @@ -2554,9 +2554,9 @@ static void at91ether_rx(struct net_device *dev)
> >  	while (lp->rx_ring[lp->rx_tail].addr & MACB_BIT(RX_USED)) {
> >  		p_recv = lp->rx_buffers + lp->rx_tail * AT91ETHER_MAX_RBUFF_SZ;
> >  		pktlen = MACB_BF(RX_FRMLEN, lp->rx_ring[lp->rx_tail].ctrl);
> > -		skb = netdev_alloc_skb(dev, pktlen + 2);
> > +		skb = netdev_alloc_skb(dev, pktlen + NET_IP_ALIGN);
> >  		if (skb) {
> > -			skb_reserve(skb, 2);
> > +			skb_reserve(skb, NET_IP_ALIGN);
> >  			memcpy(skb_put(skb, pktlen), p_recv, pktlen);
> >  
> >  			skb->protocol = eth_type_trans(skb, dev);
> 
> Then please use netdev_alloc_skb_ip_align(), so that you get rid of
> skb_reserve()

It seems there are ~50 of these in the kernel tree
that could be converted.