On Mon, Apr 30, 2018 at 01:22:44PM -0700, Matthew Wilcox wrote:
> diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
> index e0e74e91f3e8..0e6117123737 100644
> --- a/include/linux/mm_types.h
> +++ b/include/linux/mm_types.h
> @@ -134,7 +134,7 @@ struct page {
> unsigned long _pt_pad_1; /* compound_head */
> pgtable_t pmd_huge_pte; /* protected by page->ptl */
> unsigned long _pt_pad_2; /* mapping */
> - unsigned long _pt_pad_3;
> + struct mm_struct *pt_mm;
I guess it worth to have a comment that this field is only used of pgd
page tables and therefore doesn't conflict with pmd_huge_pte.
--
Kirill A. Shutemov
