netdev - Re: [net-next 3/4] e1000: look in the page and not in skb->data for the last byte

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Date:	Thu, 17 May 2012 04:50:17 -0700
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:	davem@...emloft.net, netdev@...r.kernel.org, gospo@...hat.com,
	sassmann@...hat.com
Subject: Re: [net-next 3/4] e1000: look in the page and not in skb->data for
 the last byte

On Thu, 2012-05-17 at 13:38 +0200, Sebastian Andrzej Siewior wrote:
> On 05/17/2012 01:27 PM, Jeff Kirsher wrote:
> > diff --git a/drivers/net/ethernet/intel/e1000/e1000_main.c b/drivers/net/ethernet/intel/e1000/e1000_main.c
> > index fefbf4d..6ac80c8 100644
> > --- a/drivers/net/ethernet/intel/e1000/e1000_main.c
> > +++ b/drivers/net/ethernet/intel/e1000/e1000_main.c
> > @@ -4066,7 +4066,11 @@ static bool e1000_clean_jumbo_rx_irq(struct e1000_adapter *adapter,
> >   		/* errors is only valid for DD + EOP descriptors */
> >   		if (unlikely((status&  E1000_RXD_STAT_EOP)&&
> >   		(rx_desc->errors&  E1000_RXD_ERR_FRAME_ERR_MASK))) {
> > -			u8 last_byte = *(skb->data + length - 1);
> > +			u8 *mapped;
> > +			u8 last_byte;
> > +
> > +			mapped = kmap_atomic(buffer_info->page);
> > +			last_byte = *(mapped + length - 1);
> >   			if (TBI_ACCEPT(hw, status, rx_desc->errors, length,
> >   				       last_byte)) {
> >   				spin_lock_irqsave(&adapter->stats_lock,
> 
> This is not what I've sent. My original patch [0] hat a unmap as well. 
> One comment was, that kmap_atomic() is too much overhead because the 
> page can never be highmem. So I changed it to page_address() [1].
> 
> [0] http://permalink.gmane.org/gmane.linux.drivers.e1000.devel/10008
> [1] http://permalink.gmane.org/gmane.linux.drivers.e1000.devel/10012
> 
> Sebastian

Your correct, I apologize.  This was my fault, I applied your v1 of the
patch and then realized there was a v2.

I will re-send the series with the correct patch.

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