On Sat, Jan 12, 2008 at 03:37:59AM +0100, Andi Kleen wrote:
> > And yes, the
> > network stack shouldn't call synchronize_rcu() quite so much, but fixing
> > that
> > is a little more involved.
>
> ... but the correct solution.
There has to be at least 1 synchronize_rcu() or equivalent in the
unregister_netdev() path. I suspect the easiest way to fix it might be to
use call_rcu() to actually free the network device, as anything else will
limit performance of single threaded teardown (ie, when an l2tp daemon
gets terminated via kill -9). This means an API change that exposes
rcu for unregister_netdev().
-ben
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