check_kvmalloc_NOFS.c

   1 /*
   2  * Copyright (C) 2021 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
  20 static int my_id;
  21
  22 static void match_alloc(const char *fn, struct expression *expr, void *_arg)
  23 {
  24         int arg_nr = PTR_INT(_arg);
  25         struct expression *arg_expr;
  26         sval_t sval;
  27
  28         arg_expr = get_argument_from_call_expr(expr->args, arg_nr);
  29         if (!get_value(arg_expr, &sval))
  30                 return;
  31
  32         if (sval.value & GFP_DIRECT_RECLAIM())
  33                 return;
  34
  35         sm_error("%s() does not make sense for no sleep code", fn);
  36 }
  37
  38 void check_kvmalloc_NOFS(int id)
  39 {
  40         if (option_project != PROJ_KERNEL)
  41                 return;
  42
  43         my_id = id;
  44
  45         add_function_hook("kvmalloc", &match_alloc, INT_PTR(1));
  46         add_function_hook("kvzalloc", &match_alloc, INT_PTR(1));
  47         add_function_hook("kvmalloc_array", &match_alloc, INT_PTR(2));
  48         add_function_hook("kvcalloc", &match_alloc, INT_PTR(2));
  49 }