linux-kernel - Re: [PATCH v4 1/9] fs: Constify vma argument to vma_is

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Message-ID: <CAPcyv4hUGPCWrR=Mj4-dR3vOq5peSXvBWL2F4c0ktsAT+YygEw@mail.gmail.com>
Date:   Wed, 25 Mar 2020 21:36:47 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Thomas Hellström (VMware) 
        <thomas_os@...pmail.org>
Cc:     Linux MM <linux-mm@...ck.org>,
        Maling list - DRI developers 
        <dri-devel@...ts.freedesktop.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        pv-drivers@...are.com, linux-graphics-maintainer@...are.com,
        Thomas Hellstrom <thellstrom@...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>,
        Roland Scheidegger <sroland@...are.com>
Subject: Re: [PATCH v4 1/9] fs: Constify vma argument to vma_is_dax

On Thu, Feb 20, 2020 at 4:27 AM Thomas Hellström (VMware)
<thomas_os@...pmail.org> wrote:
>
> From: Thomas Hellstrom <thellstrom@...are.com>
>
> The vma argument is only dereferenced for reading.
>
> 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 <thellstrom@...are.com>
> 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 98e0349adb52..4f41fdbf402f 100644
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -3367,7 +3367,7 @@ 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);
>  }

Looks good to me:

Acked-by: Dan Williams <dan.j.williams@...el.com>