From 8e4bff4cab0ddac6060645b0715210484d02ff40 Mon Sep 17 00:00:00 2001 From: Yuval Adam <_@yuv.al> Date: Wed, 30 Aug 2017 08:25:59 +0000 Subject: Initial file dump from open source release --- arch/arm/include/asm/mutex.h | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) create mode 100644 arch/arm/include/asm/mutex.h (limited to 'arch/arm/include/asm/mutex.h') diff --git a/arch/arm/include/asm/mutex.h b/arch/arm/include/asm/mutex.h new file mode 100644 index 00000000..87c04491 --- /dev/null +++ b/arch/arm/include/asm/mutex.h @@ -0,0 +1,21 @@ +/* + * arch/arm/include/asm/mutex.h + * + * ARM optimized mutex locking primitives + * + * Please look into asm-generic/mutex-xchg.h for a formal definition. + */ +#ifndef _ASM_MUTEX_H +#define _ASM_MUTEX_H +/* + * On pre-ARMv6 hardware this results in a swp-based implementation, + * which is the most efficient. For ARMv6+, we have exclusive memory + * accessors and use atomic_dec to avoid the extra xchg operations + * on the locking slowpaths. + */ +#if __LINUX_ARM_ARCH__ < 6 +#include +#else +#include +#endif +#endif /* _ASM_MUTEX_H */ -- cgit v1.3.1