linux-kernel - Re: [Xen-devel] [PATCH] xen-netfront: Remove BUGs on paged skb data which crosses a page boundary

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Date:	Mon, 1 Dec 2014 13:27:32 +0000
From:	David Vrabel <david.vrabel@...rix.com>
To:	David Miller <davem@...emloft.net>, <seth.forshee@...onical.com>
CC:	<zoltan.kiss@...aro.org>, <eric.dumazet@...il.com>,
	<netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<stefan.bader@...onical.com>, <david.vrabel@...rix.com>,
	<xen-devel@...ts.xenproject.org>, <boris.ostrovsky@...cle.com>
Subject: Re: [Xen-devel] [PATCH] xen-netfront: Remove BUGs on paged skb data
 which crosses a page boundary

On 26/11/14 17:28, David Miller wrote:
> From: Seth Forshee <seth.forshee@...onical.com>
> Date: Tue, 25 Nov 2014 20:28:24 -0600
> 
>> These BUGs can be erroneously triggered by frags which refer to
>> tail pages within a compound page. The data in these pages may
>> overrun the hardware page while still being contained within the
>> compound page, but since compound_order() evaluates to 0 for tail
>> pages the assertion fails. The code already iterates through
>> subsequent pages correctly in this scenario, so the BUGs are
>> unnecessary and can be removed.
>>
>> Fixes: f36c374782e4 ("xen/netfront: handle compound page fragments on transmit")
>> Cc: <stable@...r.kernel.org> # 3.7+
>> Signed-off-by: Seth Forshee <seth.forshee@...onical.com>
> 
> Can I get some Xen developer reviews?

Sorry for the delay, I've been on holiday.

Reviewed-by: David Vrabel <david.vrabel@...rix.com>

Thanks.

David
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