1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */ 2*4882a593Smuzhiyun #ifndef __ASM_SYNC_BITOPS_H__ 3*4882a593Smuzhiyun #define __ASM_SYNC_BITOPS_H__ 4*4882a593Smuzhiyun 5*4882a593Smuzhiyun #include <asm/bitops.h> 6*4882a593Smuzhiyun 7*4882a593Smuzhiyun /* sync_bitops functions are equivalent to the SMP implementation of the 8*4882a593Smuzhiyun * original functions, independently from CONFIG_SMP being defined. 9*4882a593Smuzhiyun * 10*4882a593Smuzhiyun * We need them because _set_bit etc are not SMP safe if !CONFIG_SMP. But 11*4882a593Smuzhiyun * under Xen you might be communicating with a completely external entity 12*4882a593Smuzhiyun * who might be on another CPU (e.g. two uniprocessor guests communicating 13*4882a593Smuzhiyun * via event channels and grant tables). So we need a variant of the bit 14*4882a593Smuzhiyun * ops which are SMP safe even on a UP kernel. 15*4882a593Smuzhiyun */ 16*4882a593Smuzhiyun 17*4882a593Smuzhiyun #define sync_set_bit(nr, p) _set_bit(nr, p) 18*4882a593Smuzhiyun #define sync_clear_bit(nr, p) _clear_bit(nr, p) 19*4882a593Smuzhiyun #define sync_change_bit(nr, p) _change_bit(nr, p) 20*4882a593Smuzhiyun #define sync_test_and_set_bit(nr, p) _test_and_set_bit(nr, p) 21*4882a593Smuzhiyun #define sync_test_and_clear_bit(nr, p) _test_and_clear_bit(nr, p) 22*4882a593Smuzhiyun #define sync_test_and_change_bit(nr, p) _test_and_change_bit(nr, p) 23*4882a593Smuzhiyun #define sync_test_bit(nr, addr) test_bit(nr, addr) 24*4882a593Smuzhiyun #define sync_cmpxchg cmpxchg 25*4882a593Smuzhiyun 26*4882a593Smuzhiyun 27*4882a593Smuzhiyun #endif 28