diff options
Diffstat (limited to 'arch/arc/include/asm/mutex.h')
| -rw-r--r-- | arch/arc/include/asm/mutex.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/arch/arc/include/asm/mutex.h b/arch/arc/include/asm/mutex.h new file mode 100644 index 00000000000..a2f88ff9f50 --- /dev/null +++ b/arch/arc/include/asm/mutex.h @@ -0,0 +1,18 @@ +/* + * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +/* + * xchg() based mutex fast path maintains a state of 0 or 1, as opposed to + * atomic dec based which can "count" any number of lock contenders. + * This ideally needs to be fixed in core, but for now switching to dec ver. + */ +#if defined(CONFIG_SMP) && (CONFIG_NR_CPUS > 2) +#include <asm-generic/mutex-dec.h> +#else +#include <asm-generic/mutex-xchg.h> +#endif |