linux-kernel - Re: [PATCH v7 1/9] fs: Constify vma argument to vma_is

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Date:   Thu, 26 Mar 2020 08:19:47 +0100
From:   Pankaj Gupta <pankaj.gupta.linux@...il.com>
To:     Thomas Hellström (VMware) 
        <thomas_os@...pmail.org>
Cc:     linux-mm@...ck.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, pv-drivers@...are.com,
        linux-graphics-maintainer@...are.com,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Ralph Campbell <rcampbell@...dia.com>,
        Jérôme Glisse <jglisse@...hat.com>,
        Christian König <christian.koenig@....com>,
        Dan Williams <dan.j.williams@...el.com>,
        Roland Scheidegger <sroland@...are.com>
Subject: Re: [PATCH v7 1/9] fs: Constify vma argument to vma_is_dax

> From: "Thomas Hellstrom (VMware)" <thomas_os@...pmail.org>
>
> The function is used by upcoming vma_is_special_huge() with which we want
> to use a const vma argument. Since for vma_is_dax() the vma argument is
> only dereferenced for reading, constify it.
>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Michal Hocko <mhocko@...e.com>
> Cc: "Matthew Wilcox (Oracle)" <willy@...radead.org>
> Cc: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
> Cc: Ralph Campbell <rcampbell@...dia.com>
> Cc: "Jérôme Glisse" <jglisse@...hat.com>
> Cc: "Christian König" <christian.koenig@....com>
> Cc: Dan Williams <dan.j.williams@...el.com>
> Signed-off-by: Thomas Hellstrom (VMware) <thomas_os@...pmail.org>
> Reviewed-by: Roland Scheidegger <sroland@...are.com>
> Acked-by: Christian König <christian.koenig@....com>
> ---
>  include/linux/fs.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/include/linux/fs.h b/include/linux/fs.h
> index 3cd4fe6b845e..2b38ce5b73ad 100644
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -3391,7 +3391,7 @@ static inline bool io_is_direct(struct file *filp)
>         return (filp->f_flags & O_DIRECT) || IS_DAX(filp->f_mapping->host);
>  }
>
> -static inline bool vma_is_dax(struct vm_area_struct *vma)
> +static inline bool vma_is_dax(const struct vm_area_struct *vma)
>  {
>         return vma->vm_file && IS_DAX(vma->vm_file->f_mapping->host);
>  }
> --
Acked-by: Pankaj Gupta <pankaj.gupta.linux@...il.com>

> 2.21.1
>
>