On Mon, Jun 24, 2024 at 11:53:30AM -0700, Yosry Ahmed wrote: > After a page is swapped out during reclaim, __remove_mapping() will > call __delete_from_swap_cache() to replace the swap cache entry with a > shadow entry (which is an xa_value). Special entries are disjoint from shadow entries. Shadow entries have the last two bits as 01 or 11 (are congruent to 1 or 3 modulo 4). Special entries have values below 4096 which end in 10 (are congruent to 2 modulo 4).
