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Blackfin: convert to asm-generic/mutex-dec.h for all systems
The Blackfin mutex.h is merely a copy of an older asm-generic/mutex-dec.h, so punt it and just use the common one directly. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
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Mike Frysinger
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Jul 23, 2011
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,76 +1 @@ | ||
| /* | ||
| * Pull in the generic implementation for the mutex fastpath. | ||
| * | ||
| * TODO: implement optimized primitives instead, or leave the generic | ||
| * implementation in place, or pick the atomic_xchg() based generic | ||
| * implementation. (see asm-generic/mutex-xchg.h for details) | ||
| * | ||
| * Copyright 2006-2009 Analog Devices Inc. | ||
| * | ||
| * Licensed under the GPL-2 or later. | ||
| */ | ||
|
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| #ifndef _ASM_MUTEX_H | ||
| #define _ASM_MUTEX_H | ||
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| #ifndef CONFIG_SMP | ||
| #include <asm-generic/mutex.h> | ||
| #else | ||
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| static inline void | ||
| __mutex_fastpath_lock(atomic_t *count, void (*fail_fn)(atomic_t *)) | ||
| { | ||
| if (unlikely(atomic_dec_return(count) < 0)) | ||
| fail_fn(count); | ||
| else | ||
| smp_mb(); | ||
| } | ||
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| static inline int | ||
| __mutex_fastpath_lock_retval(atomic_t *count, int (*fail_fn)(atomic_t *)) | ||
| { | ||
| if (unlikely(atomic_dec_return(count) < 0)) | ||
| return fail_fn(count); | ||
| else { | ||
| smp_mb(); | ||
| return 0; | ||
| } | ||
| } | ||
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| static inline void | ||
| __mutex_fastpath_unlock(atomic_t *count, void (*fail_fn)(atomic_t *)) | ||
| { | ||
| smp_mb(); | ||
| if (unlikely(atomic_inc_return(count) <= 0)) | ||
| fail_fn(count); | ||
| } | ||
|
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| #define __mutex_slowpath_needs_to_unlock() 1 | ||
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| static inline int | ||
| __mutex_fastpath_trylock(atomic_t *count, int (*fail_fn)(atomic_t *)) | ||
| { | ||
| /* | ||
| * We have two variants here. The cmpxchg based one is the best one | ||
| * because it never induce a false contention state. It is included | ||
| * here because architectures using the inc/dec algorithms over the | ||
| * xchg ones are much more likely to support cmpxchg natively. | ||
| * | ||
| * If not we fall back to the spinlock based variant - that is | ||
| * just as efficient (and simpler) as a 'destructive' probing of | ||
| * the mutex state would be. | ||
| */ | ||
| #ifdef __HAVE_ARCH_CMPXCHG | ||
| if (likely(atomic_cmpxchg(count, 1, 0) == 1)) { | ||
| smp_mb(); | ||
| return 1; | ||
| } | ||
| return 0; | ||
| #else | ||
| return fail_fn(count); | ||
| #endif | ||
| } | ||
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| #endif | ||
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| #endif | ||
| #include <asm-generic/mutex-dec.h> |