check_not_passing_gfp.c

   1 /*
   2  * Copyright (C) 2012 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 const char *my_flags;
  24
  25 static void match_function_definition(struct symbol *sym)
  26 {
  27         struct symbol *arg;
  28         char *type_str;
  29
  30         FOR_EACH_PTR(sym->ctype.base_type->arguments, arg) {
  31                 type_str = pos_ident(arg->pos);
  32                 if (!type_str || strcmp(type_str, "gfp_t") != 0)
  33                         continue;
  34                 my_flags = arg->ident->name;
  35                 return;
  36         } END_FOR_EACH_PTR(arg);
  37 }
  38
  39 static void match_call(struct expression *expr)
  40 {
  41         struct expression *arg;
  42         char *name;
  43
  44         if (!my_flags)
  45                 return;
  46
  47         FOR_EACH_PTR(expr->args, arg) {
  48                 name = get_macro_name(arg->pos);
  49                 if (!name || strncmp(name, "GFP_", 4) != 0)
  50                         continue;
  51                 if (strcmp(name, "GFP_KERNEL") != 0)
  52                         continue;
  53                 sm_msg("warn: use '%s' here instead of %s?", my_flags, name);
  54         } END_FOR_EACH_PTR(arg);
  55 }
  56
  57 void check_not_passing_gfp(int id)
  58 {
  59         if (option_project != PROJ_KERNEL)
  60                 return;
  61
  62         my_id = id;
  63
  64         add_function_data((unsigned long *)&my_flags);
  65
  66         add_hook(&match_function_definition, FUNC_DEF_HOOK);
  67         add_hook(&match_call, FUNCTION_CALL_HOOK);
  68 }