ia64/xen: introduce sync bitops which is necessary for ia64/xen support.

#ifndef _ASM_IA64_SYNC_BITOPS_H

#define _ASM_IA64_SYNC_BITOPS_H

/*

 * Copyright (C) 2008 Isaku Yamahata <yamahata at valinux co jp>

 *

 * Based on synch_bitops.h which Dan Magenhaimer wrote.

 *

 * bit operations which provide guaranteed strong synchronisation

 * when communicating with Xen or other guest OSes running on other CPUs.

 */

static inline void sync_set_bit(int nr, volatile void *addr)

{

	set_bit(nr, addr);

}

static inline void sync_clear_bit(int nr, volatile void *addr)

{

	clear_bit(nr, addr);

}

static inline void sync_change_bit(int nr, volatile void *addr)

{

	change_bit(nr, addr);

}

static inline int sync_test_and_set_bit(int nr, volatile void *addr)

{

	return test_and_set_bit(nr, addr);

}

static inline int sync_test_and_clear_bit(int nr, volatile void *addr)

{

	return test_and_clear_bit(nr, addr);

}

static inline int sync_test_and_change_bit(int nr, volatile void *addr)

{

	return test_and_change_bit(nr, addr);

}

static inline int sync_test_bit(int nr, const volatile void *addr)

{

	return test_bit(nr, addr);

}

#define sync_cmpxchg(ptr, old, new)				\

	((__typeof__(*(ptr)))cmpxchg_acq((ptr), (old), (new)))

#endif /* _ASM_IA64_SYNC_BITOPS_H */