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kernel add
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/*
* 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 <asm-generic/mutex-xchg.h>
#else
#include <asm-generic/mutex-dec.h>
#endif
#endif /* _ASM_MUTEX_H */
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