/* *  linux/include/asm-arm26/atomic.h * *  Copyright (c) 1996 Russell King. *  Modified for arm26 by Ian Molton * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * *  Changelog: *   25-11-2004 IM	Updated for 2.6.9 *   27-06-1996	RMK	Created *   13-04-1997	RMK	Made functions atomic! *   07-12-1997	RMK	Upgraded for v2.1. *   26-08-1998	PJB	Added #ifdef __KERNEL__ * *  FIXME - its probably worth seeing what these compile into... */#ifndef __ASM_ARM_ATOMIC_H#define __ASM_ARM_ATOMIC_H  #ifdef CONFIG_SMP#error SMP is NOT supported#endif typedef struct { volatile int counter; } atomic_t; #define ATOMIC_INIT(i)	{ (i) } #ifdef __KERNEL__#include <asm/system.h> #define atomic_read(v) ((v)->counter)#define atomic_set(v,i)	(((v)->counter) = (i)) static inline int atomic_add_return(int i, atomic_t *v){        unsigned long flags;        int val;         local_irq_save(flags);        val = v->counter;        v->counter = val += i;        local_irq_restore(flags);         return val;} static inline int atomic_sub_return(int i, atomic_t *v){        unsigned long flags;        int val;         local_irq_save(flags);        val = v->counter;        v->counter = val -= i;        local_irq_restore(flags);         return val;} static inline int atomic_cmpxchg(atomic_t *v, int old, int new){	int ret;	unsigned long flags; 	local_irq_save(flags);	ret = v->counter;	if (likely(ret == old))		v->counter = new;	local_irq_restore(flags); 	return ret;} #define atomic_xchg(v, new) (xchg(&((v)->counter), new)) static inline int atomic_add_unless(atomic_t *v, int a, int u){	int ret;	unsigned long flags; 	local_irq_save(flags);	ret = v->counter;	if (ret != u)		v->counter += a;	local_irq_restore(flags); 	return ret != u;}#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) static inline void atomic_clear_mask(unsigned long mask, unsigned long *addr){        unsigned long flags;         local_irq_save(flags);        *addr &= ~mask;        local_irq_restore(flags);} #define atomic_add(i, v)        (void) atomic_add_return(i, v)#define atomic_inc(v)           (void) atomic_add_return(1, v)#define atomic_sub(i, v)        (void) atomic_sub_return(i, v)#define atomic_dec(v)           (void) atomic_sub_return(1, v) #define atomic_inc_and_test(v)  (atomic_add_return(1, v) == 0)#define atomic_dec_and_test(v)  (atomic_sub_return(1, v) == 0)#define atomic_inc_return(v)    (atomic_add_return(1, v))#define atomic_dec_return(v)    (atomic_sub_return(1, v)) #define atomic_add_negative(i,v) (atomic_add_return(i, v) < 0) /* Atomic operations are already serializing on ARM26 */#define smp_mb__before_atomic_dec()	barrier()#define smp_mb__after_atomic_dec()	barrier()#define smp_mb__before_atomic_inc()	barrier()#define smp_mb__after_atomic_inc()	barrier() #include <asm-generic/atomic.h>#endif#endif