On Fri, 25 Oct 2024, Yang Shi wrote: > > The other subtle thing is folio->_deferred_list is reused when the > folio is moved to the local on-stack list. And some Yes. > list_empty(deferred_list) checks return true even though the folio is > actually on the local on-stack list. Some code may depend on or The code definitely depends on that behaviour: that's how folios get unqueued when refcount reaches 0, whether they are on the public list or on the local list at that time. > inadvertently depend on this behavior. Using folio_batch may break > some assumptions, but depending on this subtle behavior is definitely > not reliable IMHO.
