ioctl_gntdev_unmap_notify  762 drivers/xen/gntdev.c 	struct ioctl_gntdev_unmap_notify op;
ioctl_gntdev_unmap_notify  134 include/uapi/xen/gntdev.h _IOC(_IOC_NONE, 'G', 7, sizeof(struct ioctl_gntdev_unmap_notify))