On Tue, Feb 12, 2019 at 10:56:12AM +0800, Peter Xu wrote:
> From: Shaohua Li <shli@xxxxxx>
>
> add helper for writeprotect check. Will use it later.
>
> Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
> Cc: Pavel Emelyanov <xemul@xxxxxxxxxxxxx>
> Cc: Rik van Riel <riel@xxxxxxxxxx>
> Cc: Kirill A. Shutemov <kirill@xxxxxxxxxxxxx>
> Cc: Mel Gorman <mgorman@xxxxxxx>
> Cc: Hugh Dickins <hughd@xxxxxxxxxx>
> Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
> Signed-off-by: Shaohua Li <shli@xxxxxx>
> Signed-off-by: Andrea Arcangeli <aarcange@xxxxxxxxxx>
> Signed-off-by: Peter Xu <peterx@xxxxxxxxxx>
Reviewed-by: Jérôme Glisse <jglisse@xxxxxxxxxx>
> ---
> include/linux/userfaultfd_k.h | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
> diff --git a/include/linux/userfaultfd_k.h b/include/linux/userfaultfd_k.h
> index 37c9eba75c98..38f748e7186e 100644
> --- a/include/linux/userfaultfd_k.h
> +++ b/include/linux/userfaultfd_k.h
> @@ -50,6 +50,11 @@ static inline bool userfaultfd_missing(struct vm_area_struct *vma)
> return vma->vm_flags & VM_UFFD_MISSING;
> }
>
> +static inline bool userfaultfd_wp(struct vm_area_struct *vma)
> +{
> + return vma->vm_flags & VM_UFFD_WP;
> +}
> +
> static inline bool userfaultfd_armed(struct vm_area_struct *vma)
> {
> return vma->vm_flags & (VM_UFFD_MISSING | VM_UFFD_WP);
> @@ -94,6 +99,11 @@ static inline bool userfaultfd_missing(struct vm_area_struct *vma)
> return false;
> }
>
> +static inline bool userfaultfd_wp(struct vm_area_struct *vma)
> +{
> + return false;
> +}
> +
> static inline bool userfaultfd_armed(struct vm_area_struct *vma)
> {
> return false;
> --
> 2.17.1
>
