// SPDX-License-Identifier: GPL-2.0/* * 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 <linux/atomic.h> #ifdef CONFIG_SMParch_spinlock_t __atomic_hash[ATOMIC_HASH_SIZE] __lock_aligned = {	[0 ... (ATOMIC_HASH_SIZE-1)]  = __ARCH_SPIN_LOCK_UNLOCKED};#endif #ifdef CONFIG_64BITunsigned long notrace __xchg64(unsigned long x, volatile 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 notrace __xchg32(int x, volatile 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 notrace __xchg8(char x, volatile 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;}  #define CMPXCHG(T)						\	T notrace __cmpxchg_##T(volatile T *ptr, T old, T new)	\	{							\		unsigned long flags;				\		T prev;						\								\		_atomic_spin_lock_irqsave(ptr, flags);		\		if ((prev = *ptr) == old)			\			*ptr = new;				\		_atomic_spin_unlock_irqrestore(ptr, flags);	\		return prev;					\	} CMPXCHG(u64)CMPXCHG(u32)CMPXCHG(u16)CMPXCHG(u8)