gnttab_try_end_foreign_access
if (!gnttab_try_end_foreign_access(s->grants_used[i]->gref)) {
if (!gnttab_try_end_foreign_access(s->indirect_grants[i]->gref)) {
!gnttab_try_end_foreign_access(gnt_list_entry->gref))
if (unlikely(!gnttab_try_end_foreign_access(shadow->gref[i]))) {
if (!gnttab_try_end_foreign_access(shadow->req.seg[i].gref))
EXPORT_SYMBOL_GPL(gnttab_try_end_foreign_access);
if (gnttab_try_end_foreign_access(ref)) {
int gnttab_try_end_foreign_access(grant_ref_t ref);