> Basically we have two cases:
> - paging in something new ("no_page"), for which the final test is just
> to test that the page table is still zero (ie we don't even need to
> save any "original" value).
> - paging in something old ("swap_page"), in wich case the final test is
> to check that the pte is still the same as swp_entry_to_pte(entry).
>
Or: we define a new value SWP_LOADING (eg SWP_ENTRY(1,0).
if the pte entry is SWP_LOADING, then we just sleep.
otherwise, we replace the pte with SWP_LOADING, do the actual io, and
wake-up all other threads that are waiting.
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