1#ifndef __ASM_SYNC_BITOPS_H__
 2#define __ASM_SYNC_BITOPS_H__
 3
 4#include <asm/bitops.h>
 5
 6/* sync_bitops functions are equivalent to the SMP implementation of the
 7 * original functions, independently from CONFIG_SMP being defined.
 8 *
 9 * We need them because _set_bit etc are not SMP safe if !CONFIG_SMP. But
10 * under Xen you might be communicating with a completely external entity
11 * who might be on another CPU (e.g. two uniprocessor guests communicating
12 * via event channels and grant tables). So we need a variant of the bit
13 * ops which are SMP safe even on a UP kernel.
14 */
15
16#define sync_set_bit(nr, p)		_set_bit(nr, p)
17#define sync_clear_bit(nr, p)		_clear_bit(nr, p)
18#define sync_change_bit(nr, p)		_change_bit(nr, p)
19#define sync_test_and_set_bit(nr, p)	_test_and_set_bit(nr, p)
20#define sync_test_and_clear_bit(nr, p)	_test_and_clear_bit(nr, p)
21#define sync_test_and_change_bit(nr, p)	_test_and_change_bit(nr, p)
22#define sync_test_bit(nr, addr)		test_bit(nr, addr)
23#define sync_cmpxchg			cmpxchg
24
25
26#endif