Re: [PATCH 1/1] mm/huge_memory: disallow raw PMD mappings of the huge zero page

[Kiryl Shutsemau]

On Thu, Sep 17, 2026 at 08:10:10PM +0800, Lance Yang wrote:
> vm_mixed_zeropage_allowed() validates zeropage insertion into
> VM_MIXEDMAP VMAs. No in-tree user needs to insert the huge zero page
> through vmf_insert_pfn_pmd().
> 
> Return VM_FAULT_SIGBUS if vmf_insert_pfn_pmd() is asked to map it.
> 
> Link: https://lore.kernel.org/linux-mm/f76beaf8-351a-4b22-b362-a945a5e1af6a@xxxxxxxxxx/
> Suggested-by: Kiryl Shutsemau <kas@xxxxxxxxxx>
> Suggested-by: David Hildenbrand <david@xxxxxxxxxx>
> Signed-off-by: Lance Yang <lance.yang@xxxxxxxxx>

The patch looks fine, but don't we want to cover the same for non-huge
zero page in vmf_insert_pfn_prot()?

-- 
  Kiryl Shutsemau / Kirill A. Shutemov