release/src-rt-6.x.4708/linux/linux-2.6.36/kernel/rcutiny_plugin.h

   1 /*
   2  * Read-Copy Update mechanism for mutual exclusion (tree-based version)
   3  * Internal non-public definitions that provide either classic
   4  * or preemptable semantics.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  *
  20  * Copyright IBM Corporation, 2009
  21  *
  22  * Author: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
  23  */
  24
  25 #ifdef CONFIG_DEBUG_LOCK_ALLOC
  26
  27 #include <linux/kernel_stat.h>
  28
  29 /*
  30  * During boot, we forgive RCU lockdep issues.  After this function is
  31  * invoked, we start taking RCU lockdep issues seriously.
  32  */
  33 void rcu_scheduler_starting(void)
  34 {
  35         WARN_ON(nr_context_switches() > 0);
  36         rcu_scheduler_active = 1;
  37 }
  38
  39 #endif /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */