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