Shouldn't this be folded into the previous change 'net: add support for
per-paged-fragment destructors'?  Maybe it doesn't matter since nothing
is setting a non-NULL fragment destructor yet.

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.