On Wed, Nov 26, 2014 at 12:28:12PM -0500, David Miller wrote:
> From: Seth Forshee <seth.fors...@canonical.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: <sta...@vger.kernel.org> # 3.7+
> > Signed-off-by: Seth Forshee <seth.fors...@canonical.com>
>
> Can I get some Xen developer reviews?
Fwiw this issue was discussed previously and this was the recommended
fix.
http://article.gmane.org/gmane.linux.kernel/1825381
Since then I got some feedback from a tester that he didn't see any
problems with the BUGs removed (actually replaced with a WARN so I know
that he actually saw the condition which triggered the BUG).
Thanks,
Seth
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