On 2/27/24 11:00 AM, Matthew Wilcox wrote: > On Tue, Feb 27, 2024 at 10:13:38AM -0800, Jianfeng Wang wrote: >> Change cma_alloc() to return struct folio. This further increases the >> usage of folios in mm/hugetlb. > > I love the idea, but I don't think this works. The memory returned > from cma_alloc() isn't set up to be a folio, is it? That is, it > doesn't have compound_head initialised so that page_folio() on > consecutive pages will return the same pointer. > Thanks for review. cma_alloc() returns an array of order-0 pages. So, this commit makes cma_alloc() return an array of folios (each an order-0 page) rather than a compound page. Functions that use cma_alloc() do not expect a compound page as well. > Or have I misunderstood?
