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The "hot" list stored in a shared_context was used to keep a reference to shared blocks that were currently being used and were thus removed from the available list (so that they don't get reused for another cache response). This 'hot' list does not ever need to be shared across threads since every one of them only works on their current row. The main need behind this 'hot' list was to detach the corresponding blocks from the 'avail' list and to have a known list root when calling list_for_each_entry_from in shctx_row_data_append (for instance). Since we actually never need to iterate over all members of the 'hot' list, we can remove it and replace the inc_hot/dec_hot logic by a detach/reattach one.