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From:   Pankaj Gupta <pankaj.gupta.linux@gmail.com>
Date:   Thu, 26 Mar 2020 08:19:47 +0100
Message-ID: <CAM9Jb+i=r5RuSruFgYomoDMBgkqw=+ff-VmBfVByY_DPT2_2VA@mail.gmail.com>
Subject: Re: [PATCH v7 1/9] fs: Constify vma argument to vma_is_dax
To:     =?UTF-8?Q?Thomas_Hellstr=C3=B6m_=28VMware=29?= 
        <thomas_os@shipmail.org>
Cc:     linux-mm@kvack.org, dri-devel@lists.freedesktop.org,
        linux-kernel@vger.kernel.org, pv-drivers@vmware.com,
        linux-graphics-maintainer@vmware.com,
        Andrew Morton <akpm@linux-foundation.org>,
        Michal Hocko <mhocko@suse.com>,
        "Matthew Wilcox (Oracle)" <willy@infradead.org>,
        "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
        Ralph Campbell <rcampbell@nvidia.com>,
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        =?UTF-8?Q?Christian_K=C3=B6nig?= <christian.koenig@amd.com>,
        Dan Williams <dan.j.williams@intel.com>,
        Roland Scheidegger <sroland@vmware.com>
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> From: "Thomas Hellstrom (VMware)" <thomas_os@shipmail.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@linux-foundation.org>
> Cc: Michal Hocko <mhocko@suse.com>
> Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>
> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
> Cc: Ralph Campbell <rcampbell@nvidia.com>
> Cc: "J=C3=A9r=C3=B4me Glisse" <jglisse@redhat.com>
> Cc: "Christian K=C3=B6nig" <christian.koenig@amd.com>
> Cc: Dan Williams <dan.j.williams@intel.com>
> Signed-off-by: Thomas Hellstrom (VMware) <thomas_os@shipmail.org>
> Reviewed-by: Roland Scheidegger <sroland@vmware.com>
> Acked-by: Christian K=C3=B6nig <christian.koenig@amd.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@gmail.com>

> 2.21.1
>
>