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include/linux/spinlock_up.h
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#ifndef __LINUX_SPINLOCK_UP_H #define __LINUX_SPINLOCK_UP_H #ifndef __LINUX_SPINLOCK_H # error "please don't include this file directly" #endif /* * include/linux/spinlock_up.h - UP-debug version of spinlocks. * * portions Copyright 2005, Red Hat, Inc., Ingo Molnar * Released under the General Public License (GPL). * * In the debug case, 1 means unlocked, 0 means locked. (the values * are inverted, to catch initialization bugs) * * No atomicity anywhere, we are on UP. */ #ifdef CONFIG_DEBUG_SPINLOCK |
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#define arch_spin_is_locked(x) ((x)->slock == 0) |
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static inline void arch_spin_lock(arch_spinlock_t *lock) |
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{ lock->slock = 0; } static inline void |
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arch_spin_lock_flags(arch_spinlock_t *lock, unsigned long flags) |
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{ local_irq_save(flags); lock->slock = 0; } |
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static inline int arch_spin_trylock(arch_spinlock_t *lock) |
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{ char oldval = lock->slock; lock->slock = 0; return oldval > 0; } |
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static inline void arch_spin_unlock(arch_spinlock_t *lock) |
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{ lock->slock = 1; } /* * Read-write spinlocks. No debug version. */ |
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#define arch_read_lock(lock) do { (void)(lock); } while (0) #define arch_write_lock(lock) do { (void)(lock); } while (0) #define arch_read_trylock(lock) ({ (void)(lock); 1; }) #define arch_write_trylock(lock) ({ (void)(lock); 1; }) #define arch_read_unlock(lock) do { (void)(lock); } while (0) #define arch_write_unlock(lock) do { (void)(lock); } while (0) |
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#else /* DEBUG_SPINLOCK */ |
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#define arch_spin_is_locked(lock) ((void)(lock), 0) |
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/* for sched.c and kernel_lock.c: */ |
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# define arch_spin_lock(lock) do { (void)(lock); } while (0) # define arch_spin_lock_flags(lock, flags) do { (void)(lock); } while (0) # define arch_spin_unlock(lock) do { (void)(lock); } while (0) # define arch_spin_trylock(lock) ({ (void)(lock); 1; }) |
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#endif /* DEBUG_SPINLOCK */ |
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#define arch_spin_is_contended(lock) (((void)(lock), 0)) |
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#define arch_read_can_lock(lock) (((void)(lock), 1)) #define arch_write_can_lock(lock) (((void)(lock), 1)) |
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#define arch_spin_unlock_wait(lock) \ do { cpu_relax(); } while (arch_spin_is_locked(lock)) |
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#endif /* __LINUX_SPINLOCK_UP_H */ |