From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- arch/arc/include/asm/mutex.h | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) create mode 100644 arch/arc/include/asm/mutex.h (limited to 'arch/arc/include/asm/mutex.h') diff --git a/arch/arc/include/asm/mutex.h b/arch/arc/include/asm/mutex.h new file mode 100644 index 000000000..a2f88ff9f --- /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 +#else +#include +#endif -- cgit v1.2.3-54-g00ecf