netdev - Re: [PATCH] xen-netfront: Remove BUGs on paged skb data which crosses a page boundary

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Message-Id: <20141202.192530.460426718376541462.davem@davemloft.net>
Date:	Tue, 02 Dec 2014 19:25:30 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	seth.forshee@...onical.com
Cc:	konrad.wilk@...cle.com, boris.ostrovsky@...cle.com,
	david.vrabel@...rix.com, zoltan.kiss@...aro.org,
	eric.dumazet@...il.com, stefan.bader@...onical.com,
	xen-devel@...ts.xenproject.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] xen-netfront: Remove BUGs on paged skb data which
 crosses a page boundary

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>

Applied, thanks.
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