#ifndef __ASM_SYNC_BITOPS_H__#define __ASM_SYNC_BITOPS_H__#include <asm/bitops.h>#include <asm/system.h>/* sync_bitops functions are equivalent to the SMP implementation of the * original functions, independently from CONFIG_SMP being defined. * * We need them because _set_bit etc are not SMP safe if !CONFIG_SMP. But * under Xen you might be communicating with a completely external entity * who might be on another CPU (e.g. two uniprocessor guests communicating * via event channels and grant tables). So we need a variant of the bit * ops which are SMP safe even on a UP kernel. */#define sync_set_bit(nr, p) _set_bit(nr, p)#define sync_clear_bit(nr, p) _clear_bit(nr, p)#define sync_change_bit(nr, p) _change_bit(nr, p)#define sync_test_and_set_bit(nr, p) _test_and_set_bit(nr, p)#define sync_test_and_clear_bit(nr, p) _test_and_clear_bit(nr, p)#define sync_test_and_change_bit(nr, p) _test_and_change_bit(nr, p)#define sync_test_bit(nr, addr) test_bit(nr, addr)#define sync_cmpxchg cmpxchg#endif
