1#ifndef __ASM_SYNC_BITOPS_H__ 2#define __ASM_SYNC_BITOPS_H__ 3 4#include <asm/bitops.h> 5#include <asm/cmpxchg.h> 6 7/* sync_bitops functions are equivalent to the SMP implementation of the 8 * original functions, independently from CONFIG_SMP being defined. 9 * 10 * We need them because _set_bit etc are not SMP safe if !CONFIG_SMP. But 11 * under Xen you might be communicating with a completely external entity 12 * who might be on another CPU (e.g. two uniprocessor guests communicating 13 * via event channels and grant tables). So we need a variant of the bit 14 * ops which are SMP safe even on a UP kernel. 15 */ 16 17#define sync_set_bit(nr, p) set_bit(nr, p) 18#define sync_clear_bit(nr, p) clear_bit(nr, p) 19#define sync_change_bit(nr, p) change_bit(nr, p) 20#define sync_test_and_set_bit(nr, p) test_and_set_bit(nr, p) 21#define sync_test_and_clear_bit(nr, p) test_and_clear_bit(nr, p) 22#define sync_test_and_change_bit(nr, p) test_and_change_bit(nr, p) 23#define sync_test_bit(nr, addr) test_bit(nr, addr) 24#define sync_cmpxchg cmpxchg 25 26#endif 27