On Wed, Mar 17, 2021 at 03:15:12PM -0700, akpm@xxxxxxxxxxxxxxxxxxxx wrote: > Several architectures already have definition of PMD_ORDER as the size of > second level page table, so to avoid conflict with these definitions use > PMD_PAGE_ORDER name and update DAX respectively. I thought I NACKed this patch already? The architectures should be updated to not use PMD_ORDER. PMD_ORDER is clearly the right name for what is now PMD_PAGE_ORDER. The architectures should be using PMD_ALLOC_ORDER or some such.