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charset="utf-8" There's neither documentation of what this flag is supposed to mean, nor any implementation. With this, don't even bother enclosing the #define-s in a __XEN_INTERFACE_VERSION__ conditional, but drop them altogether. Signed-off-by: Jan Beulich --- a/xen/include/public/grant_table.h +++ b/xen/include/public/grant_table.h @@ -628,9 +628,6 @@ DEFINE_XEN_GUEST_HANDLE(gnttab_cache_flu #define _GNTMAP_contains_pte (4) #define GNTMAP_contains_pte (1<<_GNTMAP_contains_pte) =20 -#define _GNTMAP_can_fail (5) -#define GNTMAP_can_fail (1<<_GNTMAP_can_fail) - /* * Bits to be placed in guest kernel available PTE bits (architecture * dependent; only supported when XENFEAT_gnttab_map_avail_bits is set).