forked from luck/tmp_suning_uos_patched
edc35bd72e
Further name space cleanup. No functional change Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Peter Zijlstra <peterz@infradead.org> Acked-by: David S. Miller <davem@davemloft.net> Acked-by: Ingo Molnar <mingo@elte.hu> Cc: linux-arch@vger.kernel.org
84 lines
1.8 KiB
C
84 lines
1.8 KiB
C
/*
|
|
* bitops.c: atomic operations which got too long to be inlined all over
|
|
* the place.
|
|
*
|
|
* Copyright 1999 Philipp Rumpf (prumpf@tux.org)
|
|
* Copyright 2000 Grant Grundler (grundler@cup.hp.com)
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/spinlock.h>
|
|
#include <asm/system.h>
|
|
#include <asm/atomic.h>
|
|
|
|
#ifdef CONFIG_SMP
|
|
arch_spinlock_t __atomic_hash[ATOMIC_HASH_SIZE] __lock_aligned = {
|
|
[0 ... (ATOMIC_HASH_SIZE-1)] = __ARCH_SPIN_LOCK_UNLOCKED
|
|
};
|
|
#endif
|
|
|
|
#ifdef CONFIG_64BIT
|
|
unsigned long __xchg64(unsigned long x, unsigned long *ptr)
|
|
{
|
|
unsigned long temp, flags;
|
|
|
|
_atomic_spin_lock_irqsave(ptr, flags);
|
|
temp = *ptr;
|
|
*ptr = x;
|
|
_atomic_spin_unlock_irqrestore(ptr, flags);
|
|
return temp;
|
|
}
|
|
#endif
|
|
|
|
unsigned long __xchg32(int x, int *ptr)
|
|
{
|
|
unsigned long flags;
|
|
long temp;
|
|
|
|
_atomic_spin_lock_irqsave(ptr, flags);
|
|
temp = (long) *ptr; /* XXX - sign extension wanted? */
|
|
*ptr = x;
|
|
_atomic_spin_unlock_irqrestore(ptr, flags);
|
|
return (unsigned long)temp;
|
|
}
|
|
|
|
|
|
unsigned long __xchg8(char x, char *ptr)
|
|
{
|
|
unsigned long flags;
|
|
long temp;
|
|
|
|
_atomic_spin_lock_irqsave(ptr, flags);
|
|
temp = (long) *ptr; /* XXX - sign extension wanted? */
|
|
*ptr = x;
|
|
_atomic_spin_unlock_irqrestore(ptr, flags);
|
|
return (unsigned long)temp;
|
|
}
|
|
|
|
|
|
#ifdef CONFIG_64BIT
|
|
unsigned long __cmpxchg_u64(volatile unsigned long *ptr, unsigned long old, unsigned long new)
|
|
{
|
|
unsigned long flags;
|
|
unsigned long prev;
|
|
|
|
_atomic_spin_lock_irqsave(ptr, flags);
|
|
if ((prev = *ptr) == old)
|
|
*ptr = new;
|
|
_atomic_spin_unlock_irqrestore(ptr, flags);
|
|
return prev;
|
|
}
|
|
#endif
|
|
|
|
unsigned long __cmpxchg_u32(volatile unsigned int *ptr, unsigned int old, unsigned int new)
|
|
{
|
|
unsigned long flags;
|
|
unsigned int prev;
|
|
|
|
_atomic_spin_lock_irqsave(ptr, flags);
|
|
if ((prev = *ptr) == old)
|
|
*ptr = new;
|
|
_atomic_spin_unlock_irqrestore(ptr, flags);
|
|
return (unsigned long)prev;
|
|
}
|