netdev - Re: [PATCH/RESEND] drivers/net/ethernet: dev_alloc_skb to netdev_alloc

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Message-ID: <CA+Dx6HbxEFLTMMGJ-ASY=4zNthRtWps6KnFiPNLAz6o+HVmS9g@mail.gmail.com>
Date:	Tue, 24 Jan 2012 02:11:43 +0530
From:	"Pradeep A. Dalvi" <netdev@...deepdalvi.com>
To:	Joe Perches <joe@...ches.com>
Cc:	netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
	Christoph Hellwig <hch@....de>, linux-kernel@...r.kernel.org,
	Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: [PATCH/RESEND] drivers/net/ethernet: dev_alloc_skb to netdev_alloc_skb

On Tue, Jan 24, 2012 at 1:26 AM, Joe Perches <joe@...ches.com> wrote:
> On Tue, 2012-01-24 at 00:49 +0530, Pradeep A. Dalvi wrote:
>> On Tue, Jan 24, 2012 at 12:10 AM, Joe Perches <joe@...ches.com> wrote:
>> > On Mon, 2012-01-23 at 23:58 +0530, Pradeep A. Dalvi wrote:
>> >> Replaced deprecating dev_alloc_skb with netdev_alloc_skb in drivers/net/ethernet
>> >>   - Removed extra skb->dev = dev after netdev_alloc_skb
>> > []
>> >> diff --git a/drivers/net/ethernet/amd/lance.c b/drivers/net/ethernet/amd/lance.c
>> > []
>> >> @@ -871,13 +871,12 @@ lance_init_ring(struct net_device *dev, gfp_t gfp)
>> >>               struct sk_buff *skb;
>> >>               void *rx_buff;
>> >>
>> >> -             skb = alloc_skb(PKT_BUF_SZ, GFP_DMA | gfp);
>> >> +             skb = netdev_alloc_skb(dev, PKT_BUF_SZ);
>> >
>> > This change seems suspect.
>> Not really sure what made you suspect something in here. If you could
>> help me understand possibly broken scenarios, would essentially be
>> helpful. Thanks in advance!
>
> Where did the GFP_DMA go?

Aah! Is that really needed? Cause from my understanding, priority GFP
flag __GFP_DMA is anyway negated in __alloc_skb, in a way from all
sources i.e. netdev_alloc_skb or dev_alloc_skb or even alloc_skb. Am I
missing something here?
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