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mutex.h
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1 /*
2  * arch/arm/include/asm/mutex.h
3  *
4  * ARM optimized mutex locking primitives
5  *
6  * Please look into asm-generic/mutex-xchg.h for a formal definition.
7  */
8 #ifndef _ASM_MUTEX_H
9 #define _ASM_MUTEX_H
10 /*
11  * On pre-ARMv6 hardware this results in a swp-based implementation,
12  * which is the most efficient. For ARMv6+, we have exclusive memory
13  * accessors and use atomic_dec to avoid the extra xchg operations
14  * on the locking slowpaths.
15  */
16 #if __LINUX_ARM_ARCH__ < 6
17 #include <asm-generic/mutex-xchg.h>
18 #else
19 #include <asm-generic/mutex-dec.h>
20 #endif
21 #endif /* _ASM_MUTEX_H */