e72e9355e3
git: https://android.googlesource.com/kernel/common branch: android-4.9 commit: 03fcc2fe71308c2d164b4e6cbfc738c63e670444
22 lines
577 B
C
22 lines
577 B
C
/*
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* arch/arm/include/asm/mutex.h
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*
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* ARM optimized mutex locking primitives
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*
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* Please look into asm-generic/mutex-xchg.h for a formal definition.
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*/
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#ifndef _ASM_MUTEX_H
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#define _ASM_MUTEX_H
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/*
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* On pre-ARMv6 hardware this results in a swp-based implementation,
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* which is the most efficient. For ARMv6+, we have exclusive memory
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* accessors and use atomic_dec to avoid the extra xchg operations
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* on the locking slowpaths.
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*/
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#if __LINUX_ARM_ARCH__ < 6
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#include <asm-generic/mutex-xchg.h>
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#else
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#include <asm-generic/mutex-dec.h>
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#endif
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#endif /* _ASM_MUTEX_H */
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