DEVLINK_ATTR_FLASH_UPDATE_OVERWRITE_MASK
nla_overwrite_mask = info->attrs[DEVLINK_ATTR_FLASH_UPDATE_OVERWRITE_MASK];
.maxattr = DEVLINK_ATTR_FLASH_UPDATE_OVERWRITE_MASK,
static const struct nla_policy devlink_flash_update_nl_policy[DEVLINK_ATTR_FLASH_UPDATE_OVERWRITE_MASK + 1] = {
[DEVLINK_ATTR_FLASH_UPDATE_OVERWRITE_MASK] = NLA_POLICY_BITFIELD32(3),