set_global_limit
set_global_limit(dd, new_total);
set_global_limit(dd, new_total);
static int set_global_limit(const char *val, const struct kernel_param *kp);
module_param_call(max_user_bgreq, set_global_limit, param_get_uint,
module_param_call(max_user_congthresh, set_global_limit, param_get_uint,