On Thu, Oct 12, 2023 at 10:11:06AM +0900, Hyesoo Yu wrote: > For compound pages, the head sets the PG_head flag and > the tail sets the compound_head to indicate the head page. > If a user allocates a compound page and frees it with a different > order, the compound page information will not be properly > initialized. To detect this problem, compound_page(page) and > the order are compared, but it is not checked when the order is 0. > That error should be checked regardless of the order. I believe all compound pages are order >= 1, so this error can't occur when the order is 0.
