1 /* 2 * Copyright (C) 2015 Oracle. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation; either version 2 7 * of the License, or (at your option) any later version. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, see http://www.gnu.org/copyleft/gpl.txt 16 */ 17 18 #include "smatch.h" 19 #include "smatch_slist.h" 20 21 static int my_id; 22 23 static void match_test_bit(const char *fn, struct expression *expr, void *data) 24 { 25 struct expression *arg; 26 char *macro; 27 28 arg = get_argument_from_call_expr(expr->args, 0); 29 arg = strip_expr(arg); 30 31 if (!arg || arg->type != EXPR_BINOP) 32 return; 33 if (arg->op != '|' && arg->op != SPECIAL_LEFTSHIFT) 34 return; 35 macro = get_macro_name(arg->pos); 36 if (macro && strstr(macro, "cpu_has")) 37 return; 38 sm_warning("test_bit() takes a bit number"); 39 } 40 41 void check_test_bit(int id) 42 { 43 my_id = id; 44 45 if (option_project != PROJ_KERNEL) 46 return; 47 48 add_function_hook("test_bit", &match_test_bit, NULL); 49 add_function_hook("variable_test_bit", &match_test_bit, NULL); 50 add_function_hook("set_bit", &match_test_bit, NULL); 51 add_function_hook("clear_bit", &match_test_bit, NULL); 52 add_function_hook("test_and_clear_bit", &match_test_bit, NULL); 53 add_function_hook("test_and_set_bit", &match_test_bit, NULL); 54 } 55