>>> On 21.02.18 at 15:02, <julien.gr...@arm.com> wrote:
> @@ -872,7 +879,7 @@ map_grant_ref(
>      struct grant_table *lgt, *rgt;
>      struct vcpu   *led;
>      grant_handle_t handle;
> -    unsigned long  frame = 0;
> +    mfn_t frame = _mfn(0);

If the initializer is needed at all, I think it should again become
INVALID_MFN. Same in a few other places.

> --- a/xen/include/asm-x86/grant_table.h
> +++ b/xen/include/asm-x86/grant_table.h
> @@ -76,7 +76,7 @@ static inline unsigned int gnttab_dom0_max(void)
>  #define gnttab_status_gmfn(d, t, i)                     \
>      (mfn_to_gmfn(d, gnttab_status_mfn(t, i)))
>  
> -#define gnttab_mark_dirty(d, f) paging_mark_dirty((d), _mfn(f))
> +#define gnttab_mark_dirty(d, f) paging_mark_dirty((d), f)

Please take the opportunity and also drop the stray parentheses
around d.

With these taken care of and with Wei's R-b
Acked-by: Jan Beulich <jbeul...@suse.com>

Jan


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