[PATCH] m32r: update include/asm-m32r/semaphore.h
This patch updates include/asm-m32r/semaphore.h for good readability and maintainability. Signed-off-by: Hirokazu Takata <takata@linux-m32r.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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@ -9,7 +9,7 @@
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* SMP- and interrupt-safe semaphores..
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*
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* Copyright (C) 1996 Linus Torvalds
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* Copyright (C) 2004 Hirokazu Takata <takata at linux-m32r.org>
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* Copyright (C) 2004, 2006 Hirokazu Takata <takata at linux-m32r.org>
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*/
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#include <linux/config.h>
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@ -77,27 +77,8 @@ asmlinkage void __up(struct semaphore * sem);
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*/
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static inline void down(struct semaphore * sem)
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{
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unsigned long flags;
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long count;
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might_sleep();
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local_irq_save(flags);
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__asm__ __volatile__ (
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"# down \n\t"
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DCACHE_CLEAR("%0", "r4", "%1")
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M32R_LOCK" %0, @%1; \n\t"
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"addi %0, #-1; \n\t"
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M32R_UNLOCK" %0, @%1; \n\t"
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: "=&r" (count)
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: "r" (&sem->count)
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: "memory"
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#ifdef CONFIG_CHIP_M32700_TS1
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, "r4"
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#endif /* CONFIG_CHIP_M32700_TS1 */
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);
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local_irq_restore(flags);
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if (unlikely(count < 0))
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if (unlikely(atomic_dec_return(&sem->count) < 0))
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__down(sem);
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}
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@ -107,28 +88,10 @@ static inline void down(struct semaphore * sem)
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*/
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static inline int down_interruptible(struct semaphore * sem)
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{
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unsigned long flags;
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long count;
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int result = 0;
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might_sleep();
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local_irq_save(flags);
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__asm__ __volatile__ (
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"# down_interruptible \n\t"
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DCACHE_CLEAR("%0", "r4", "%1")
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M32R_LOCK" %0, @%1; \n\t"
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"addi %0, #-1; \n\t"
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M32R_UNLOCK" %0, @%1; \n\t"
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: "=&r" (count)
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: "r" (&sem->count)
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: "memory"
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#ifdef CONFIG_CHIP_M32700_TS1
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, "r4"
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#endif /* CONFIG_CHIP_M32700_TS1 */
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);
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local_irq_restore(flags);
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if (unlikely(count < 0))
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if (unlikely(atomic_dec_return(&sem->count) < 0))
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result = __down_interruptible(sem);
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return result;
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@ -174,26 +137,7 @@ static inline int down_trylock(struct semaphore * sem)
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*/
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static inline void up(struct semaphore * sem)
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{
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unsigned long flags;
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long count;
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local_irq_save(flags);
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__asm__ __volatile__ (
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"# up \n\t"
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DCACHE_CLEAR("%0", "r4", "%1")
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M32R_LOCK" %0, @%1; \n\t"
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"addi %0, #1; \n\t"
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M32R_UNLOCK" %0, @%1; \n\t"
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: "=&r" (count)
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: "r" (&sem->count)
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: "memory"
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#ifdef CONFIG_CHIP_M32700_TS1
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, "r4"
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#endif /* CONFIG_CHIP_M32700_TS1 */
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);
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local_irq_restore(flags);
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if (unlikely(count <= 0))
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if (unlikely(atomic_inc_return(&sem->count) <= 0))
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__up(sem);
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}
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