On Thu, Jul 17, 2025 at 01:52:08PM +0200, David Hildenbrand wrote: >The huge zero folio is refcounted (+mapcounted -- is that a word?) >differently than "normal" folios, similarly (but different) to the ordinary >shared zeropage. > >For this reason, we special-case these pages in >vm_normal_page*/vm_normal_folio*, and only allow selected callers to >still use them (e.g., GUP can still take a reference on them). > >vm_normal_page_pmd() already filters out the huge zero folio. However, >so far we are not marking it as special like we do with the ordinary >shared zeropage. Let's mark it as special, so we can further refactor >vm_normal_page_pmd() and vm_normal_page(). > >While at it, update the doc regarding the shared zero folios. > >Reviewed-by: Oscar Salvador <osalvador@xxxxxxx> >Signed-off-by: David Hildenbrand <david@xxxxxxxxxx> Reviewed-by: Wei Yang <richard.weiyang@xxxxxxxxx> -- Wei Yang Help you, Help me
