Afaics offset etc can't be negative, so I don't think this really improves matters. I think there's quite a few other places where we use %u to print integers that we know aren't negative.
That was one of my intentions in the mentioned patch, but I couldn't confirm that the page number (and offset) in SLRU was used signed not by purpose. Thank you for confirming this. I will try to replace int to unsigned where it is relevant in SLRU as part of the mentioned thread. Though it could be a big change worth a separate patch maybe.