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SubjectRe: [v3 PATCH 3/7] mm: khugepaged: remove the redundant anon vma check
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On 2022/6/7 5:44, Yang Shi wrote:
> The hugepage_vma_check() already checked it, so remove the redundant
> check.
>
> Signed-off-by: Yang Shi <shy828301@gmail.com>
> ---
> mm/khugepaged.c | 3 ---
> 1 file changed, 3 deletions(-)
>
> diff --git a/mm/khugepaged.c b/mm/khugepaged.c
> index d0f8020164fc..7a5d1c1a1833 100644
> --- a/mm/khugepaged.c
> +++ b/mm/khugepaged.c
> @@ -966,9 +966,6 @@ static int hugepage_vma_revalidate(struct mm_struct *mm, unsigned long address,
> return SCAN_ADDRESS_RANGE;
> if (!hugepage_vma_check(vma, vma->vm_flags))
> return SCAN_VMA_CHECK;
> - /* Anon VMA expected */
> - if (!vma->anon_vma || !vma_is_anonymous(vma))
> - return SCAN_VMA_CHECK;

Is it possible that hugepage_vma_check returns true due to the shmem check, or file thp check since
we dropped mmap_lock ? So anon vma is explicitly checked again here?

Thanks!

> return 0;
> }
>
>

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