162306a36Sopenharmony_ci/* SPDX-License-Identifier: GPL-2.0 */ 262306a36Sopenharmony_ci#ifndef __ASM_SYNC_BITOPS_H__ 362306a36Sopenharmony_ci#define __ASM_SYNC_BITOPS_H__ 462306a36Sopenharmony_ci 562306a36Sopenharmony_ci#include <asm/bitops.h> 662306a36Sopenharmony_ci#include <asm/cmpxchg.h> 762306a36Sopenharmony_ci 862306a36Sopenharmony_ci/* sync_bitops functions are equivalent to the SMP implementation of the 962306a36Sopenharmony_ci * original functions, independently from CONFIG_SMP being defined. 1062306a36Sopenharmony_ci * 1162306a36Sopenharmony_ci * We need them because _set_bit etc are not SMP safe if !CONFIG_SMP. But 1262306a36Sopenharmony_ci * under Xen you might be communicating with a completely external entity 1362306a36Sopenharmony_ci * who might be on another CPU (e.g. two uniprocessor guests communicating 1462306a36Sopenharmony_ci * via event channels and grant tables). So we need a variant of the bit 1562306a36Sopenharmony_ci * ops which are SMP safe even on a UP kernel. 1662306a36Sopenharmony_ci */ 1762306a36Sopenharmony_ci 1862306a36Sopenharmony_ci#define sync_set_bit(nr, p) set_bit(nr, p) 1962306a36Sopenharmony_ci#define sync_clear_bit(nr, p) clear_bit(nr, p) 2062306a36Sopenharmony_ci#define sync_change_bit(nr, p) change_bit(nr, p) 2162306a36Sopenharmony_ci#define sync_test_and_set_bit(nr, p) test_and_set_bit(nr, p) 2262306a36Sopenharmony_ci#define sync_test_and_clear_bit(nr, p) test_and_clear_bit(nr, p) 2362306a36Sopenharmony_ci#define sync_test_and_change_bit(nr, p) test_and_change_bit(nr, p) 2462306a36Sopenharmony_ci#define sync_test_bit(nr, addr) test_bit(nr, addr) 2562306a36Sopenharmony_ci#define arch_sync_cmpxchg arch_cmpxchg 2662306a36Sopenharmony_ci 2762306a36Sopenharmony_ci#endif 28