ADD_ONCE
ADD_ONCE(cache->stats.failed_writes, 1);
ADD_ONCE(cache->stats.reclaimed, reclamations);
ADD_ONCE(info->cache->stats.pages_saved, 1);
ADD_ONCE(cache->stats.write_count, 1);
ADD_ONCE(cache->stats.read_count, 1);
ADD_ONCE(cache->stats.wait_for_page, 1);
ADD_ONCE(cache->stats.found_in_cache, 1);
ADD_ONCE(cache->stats.read_outgoing, 1);
ADD_ONCE(cache->stats.fetch_required, 1);
ADD_ONCE(cache->stats.discard_required, 1);
ADD_ONCE(cache->stats.cache_pressure, 1);
ADD_ONCE(stats->free_pages, delta);
ADD_ONCE(stats->incoming_pages, delta);
ADD_ONCE(stats->outgoing_pages, delta);
ADD_ONCE(stats->failed_pages, delta);
ADD_ONCE(stats->clean_pages, delta);
ADD_ONCE(stats->dirty_pages, delta);
ADD_ONCE(cache->stats.failed_reads, 1);
ADD_ONCE(cache->stats.failed_reads, 1);
ADD_ONCE(cache->stats.pages_loaded, 1);
ADD_ONCE(cache->stats.flush_count, 1);