1 /* 2 * Copyright (C) 2010 Dan Carpenter. 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 20 static int my_id; 21 22 /* this is stolen from the kernel but it's totally fair use dude... */ 23 #define __GFP_DMA (0x01u) 24 #define __GFP_HIGHMEM (0x02u) 25 #define __GFP_DMA32 (0x04u) 26 #define __GFP_MOVABLE (0x08u) 27 #define GFP_ZONEMASK (__GFP_DMA|__GFP_HIGHMEM|__GFP_DMA32|__GFP_MOVABLE) 28 29 static void match_alloc(const char *fn, struct expression *expr, void *_arg) 30 { 31 int arg_nr = PTR_INT(_arg); 32 struct expression *arg_expr; 33 sval_t sval; 34 35 arg_expr = get_argument_from_call_expr(expr->args, arg_nr); 36 if (!get_value(arg_expr, &sval)) 37 return; 38 if (sval.uvalue == 0) /* GFP_NOWAIT */ 39 return; 40 if (!(sval.uvalue & ~GFP_ZONEMASK)) 41 sm_error("no modifiers for allocation."); 42 } 43 44 void check_gfp_dma(int id) 45 { 46 my_id = id; 47 if (option_project != PROJ_KERNEL) 48 return; 49 add_function_hook("kmalloc", &match_alloc, INT_PTR(1)); 50 add_function_hook("kzalloc", &match_alloc, INT_PTR(1)); 51 }