Re: [RFC 09/10] mm/khugepage.c: Warn if trying to scan devmap pmd

David Hildenbrand
2024-04-11T13:46:02Z

On 11.04.24 02:57, Alistair Popple wrote:
> The only user of devmap PTEs is FS DAX, and khugepaged should not be
> scanning these VMAs. This is checked by calling
> hugepage_vma_check. Therefore khugepaged should never encounter a
> devmap PTE. Warn if this occurs.
>
> Signed-off-by: Alistair Popple <apopple@nvidia.com>
>
> ---
>
> Note this is a transitory patch to test the above assumption both at
> runtime and during review. I will likely remove it as the whole thing
> gets deleted when pXX_devmap is removed.

Yes, doesn't make sense for this patch to exist if it would go upstream
along with the next patch that removes that completely.

--
Cheers,

David / dhildenb