From: Herbert Xu <herbert@gondor.apana.org.au>
Date: Fri, 5 Sep 2008 21:55:07 +1000

ipsec: Use RCU-like construct for saved state within a walk

Ok, now that I finally understand how this works I like it.

The only comment I would make is that maybe it's a bit excessive
to trigger the GC worker every time we walk the states.

Instead you could expose the GC task's local list go:

	xfrm_state_walk_completed++;
	smp_wmb();
	if (!list_empty(&xfrm_state_gc_work_list))
		schedule_work(&xfrm_state_gc_work);

in xfrm_state_walk_done().