1*e54d2f61SStefano Stabellini #ifndef __ASM_SYNC_BITOPS_H__ 2*e54d2f61SStefano Stabellini #define __ASM_SYNC_BITOPS_H__ 3*e54d2f61SStefano Stabellini 4*e54d2f61SStefano Stabellini #include <asm/bitops.h> 5*e54d2f61SStefano Stabellini #include <asm/system.h> 6*e54d2f61SStefano Stabellini 7*e54d2f61SStefano Stabellini /* sync_bitops functions are equivalent to the SMP implementation of the 8*e54d2f61SStefano Stabellini * original functions, independently from CONFIG_SMP being defined. 9*e54d2f61SStefano Stabellini * 10*e54d2f61SStefano Stabellini * We need them because _set_bit etc are not SMP safe if !CONFIG_SMP. But 11*e54d2f61SStefano Stabellini * under Xen you might be communicating with a completely external entity 12*e54d2f61SStefano Stabellini * who might be on another CPU (e.g. two uniprocessor guests communicating 13*e54d2f61SStefano Stabellini * via event channels and grant tables). So we need a variant of the bit 14*e54d2f61SStefano Stabellini * ops which are SMP safe even on a UP kernel. 15*e54d2f61SStefano Stabellini */ 16*e54d2f61SStefano Stabellini 17*e54d2f61SStefano Stabellini #define sync_set_bit(nr, p) _set_bit(nr, p) 18*e54d2f61SStefano Stabellini #define sync_clear_bit(nr, p) _clear_bit(nr, p) 19*e54d2f61SStefano Stabellini #define sync_change_bit(nr, p) _change_bit(nr, p) 20*e54d2f61SStefano Stabellini #define sync_test_and_set_bit(nr, p) _test_and_set_bit(nr, p) 21*e54d2f61SStefano Stabellini #define sync_test_and_clear_bit(nr, p) _test_and_clear_bit(nr, p) 22*e54d2f61SStefano Stabellini #define sync_test_and_change_bit(nr, p) _test_and_change_bit(nr, p) 23*e54d2f61SStefano Stabellini #define sync_test_bit(nr, addr) test_bit(nr, addr) 24*e54d2f61SStefano Stabellini #define sync_cmpxchg cmpxchg 25*e54d2f61SStefano Stabellini 26*e54d2f61SStefano Stabellini 27*e54d2f61SStefano Stabellini #endif 28