From b7d317f5cca47313741561ffeacf4c55ade5e10e Mon Sep 17 00:00:00 2001 From: KaiGai Kohei Date: Tue, 19 Oct 2004 18:13:58 -0700 Subject: [PATCH] atomic_inc_return() for arm26 This patch implements atomic_inc_return() and so on for ARM26. Because Hugh says that SMP is not supported in arm26, it is implemented by normal operations between local_irq_save() and local_irq_restore() like another atomic operations. Signed-off-by: KaiGai, Kohei Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/asm-arm26/atomic.h | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) (limited to 'include') diff --git a/include/asm-arm26/atomic.h b/include/asm-arm26/atomic.h index 5697fc898593..56fa1a3038fa 100644 --- a/include/asm-arm26/atomic.h +++ b/include/asm-arm26/atomic.h @@ -105,6 +105,27 @@ static inline void atomic_clear_mask(unsigned long mask, unsigned long *addr) local_irq_restore(flags); } +static inline int atomic_add_return(int i, volatile atomic_t *v) +{ + unsigned long flags; + int val; + + local_irq_save(flags); + val = v->counter + i; + v->counter = val; + local_irq_restore(flags); + + return val; +} + +static inline int atomic_sub_return(int i, volatile atomic_t *v) +{ + return atomic_add_return(-i, v); +} + +#define atomic_inc_return(v) (atomic_add_return(1,v)) +#define atomic_dec_return(v) (atomic_sub_return(1,v)) + /* Atomic operations are already serializing on ARM */ #define smp_mb__before_atomic_dec() barrier() #define smp_mb__after_atomic_dec() barrier() -- cgit v1.2.3