check_scheduling_in_atomic.c

   1 /*
   2  * Copyright (C) 2018 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 int warn_line;
  23 static void schedule(void)
  24 {
  25         if (is_impossible_path())
  26                 return;
  27         if (get_preempt_cnt() <= 0)
  28                 return;
  29
  30         if (warn_line == get_lineno())
  31                 return;
  32         warn_line = get_lineno();
  33
  34         sm_msg("warn: sleeping in atomic context");
  35 }
  36
  37 void check_scheduling_in_atomic(int id)
  38 {
  39         my_id = id;
  40
  41         if (option_project != PROJ_KERNEL)
  42                 return;
  43
  44         add_sleep_callback(&schedule);
  45 }
  46