Re: [PATCH v4 1/9] fs: Constify vma argument to vma_is_dax

[Dan Williams <dan.j.williams@intel.com>]

On Thu, Feb 20, 2020 at 4:27 AM Thomas Hellström (VMware)
<thomas_os@shipmail.org> wrote:
>
> From: Thomas Hellstrom <thellstrom@vmware.com>
>
> The vma argument is only dereferenced for reading.
>
> 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: "Jérôme Glisse" <jglisse@redhat.com>
> Cc: "Christian König" <christian.koenig@amd.com>
> Cc: Dan Williams <dan.j.williams@intel.com>
> Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
> Reviewed-by: Roland Scheidegger <sroland@vmware.com>
> Acked-by: Christian König <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 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@intel.com>