WATCH_QUEUE_NOTES_PER_PAGE
page = wqueue->notes[note / WATCH_QUEUE_NOTES_PER_PAGE];
offset = note % WATCH_QUEUE_NOTES_PER_PAGE * WATCH_QUEUE_NOTE_SIZE;
nr_pages = (nr_notes + WATCH_QUEUE_NOTES_PER_PAGE - 1);
nr_pages /= WATCH_QUEUE_NOTES_PER_PAGE;
nr_notes = nr_pages * WATCH_QUEUE_NOTES_PER_PAGE;
pages[i]->private = i * WATCH_QUEUE_NOTES_PER_PAGE;