You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
53 lines
1.0 KiB
53 lines
1.0 KiB
/*
|
|
* atomic32.c: 32-bit atomic_t implementation
|
|
*
|
|
* Copyright (C) 2004 Keith M Wesolowski
|
|
*
|
|
* Based on asm-parisc/atomic.h Copyright (C) 2000 Philipp Rumpf
|
|
*/
|
|
|
|
#include <asm/atomic.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/module.h>
|
|
|
|
#ifdef CONFIG_SMP
|
|
#define ATOMIC_HASH_SIZE 4
|
|
#define ATOMIC_HASH(a) (&__atomic_hash[(((unsigned long)a)>>8) & (ATOMIC_HASH_SIZE-1)])
|
|
|
|
spinlock_t __atomic_hash[ATOMIC_HASH_SIZE] = {
|
|
[0 ... (ATOMIC_HASH_SIZE-1)] = SPIN_LOCK_UNLOCKED
|
|
};
|
|
|
|
#else /* SMP */
|
|
|
|
static DEFINE_SPINLOCK(dummy);
|
|
#define ATOMIC_HASH_SIZE 1
|
|
#define ATOMIC_HASH(a) (&dummy)
|
|
|
|
#endif /* SMP */
|
|
|
|
int __atomic_add_return(int i, atomic_t *v)
|
|
{
|
|
int ret;
|
|
unsigned long flags;
|
|
spin_lock_irqsave(ATOMIC_HASH(v), flags);
|
|
|
|
ret = (v->counter += i);
|
|
|
|
spin_unlock_irqrestore(ATOMIC_HASH(v), flags);
|
|
return ret;
|
|
}
|
|
|
|
void atomic_set(atomic_t *v, int i)
|
|
{
|
|
unsigned long flags;
|
|
spin_lock_irqsave(ATOMIC_HASH(v), flags);
|
|
|
|
v->counter = i;
|
|
|
|
spin_unlock_irqrestore(ATOMIC_HASH(v), flags);
|
|
}
|
|
|
|
EXPORT_SYMBOL(__atomic_add_return);
|
|
EXPORT_SYMBOL(atomic_set);
|
|
|
|
|