linux-kernel - Re: [RFC PATCH 1/3] mm: add function folio_in

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Date:   Fri, 7 Jul 2023 23:47:56 -0600
From:   Yu Zhao <yuzhao@...gle.com>
To:     Yin Fengwei <fengwei.yin@...el.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        ryan.roberts@....com, shy828301@...il.com,
        akpm@...ux-foundation.org, willy@...radead.org, david@...hat.com
Subject: Re: [RFC PATCH 1/3] mm: add function folio_in_range()

On Fri, Jul 7, 2023 at 10:52 AM Yin Fengwei <fengwei.yin@...el.com> wrote:
>
> It will be used to check whether the folio is mapped to specific
> VMA and whether the mapping address of folio is in the range.
>
> Signed-off-by: Yin Fengwei <fengwei.yin@...el.com>
> ---
>  mm/internal.h | 26 ++++++++++++++++++++++++++
>  1 file changed, 26 insertions(+)
>
> diff --git a/mm/internal.h b/mm/internal.h
> index f1276d90484ad..66117523d7d71 100644
> --- a/mm/internal.h
> +++ b/mm/internal.h
> @@ -585,6 +585,32 @@ extern long faultin_vma_page_range(struct vm_area_struct *vma,
>                                    bool write, int *locked);
>  extern bool mlock_future_ok(struct mm_struct *mm, unsigned long flags,
>                                unsigned long bytes);
> +
> +static inline bool
> +folio_in_range(struct folio *folio, struct vm_area_struct *vma,
> +               unsigned long start, unsigned long end)

Is there a caller that's not "folio_in_range(folio, vma,
vma->vm_start, vma->vm_end)"?

If not, then just "folio_within_vma(folio, vma)" or a wrapper on top
of  folio_in_range().