arch/arc/include/asm/mutex.h

   1 /*
   2  * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8
   9 /*
  10  * xchg() based mutex fast path maintains a state of 0 or 1, as opposed to
  11  * atomic dec based which can "count" any number of lock contenders.
  12  * This ideally needs to be fixed in core, but for now switching to dec ver.
  13  */
  14 #if defined(CONFIG_SMP) && (CONFIG_NR_CPUS > 2)
  15 #include <asm-generic/mutex-dec.h>
  16 #else
  17 #include <asm-generic/mutex-xchg.h>
  18 #endif