18c2ecf20Sopenharmony_ci/* SPDX-License-Identifier: GPL-2.0 */ 28c2ecf20Sopenharmony_ci#ifndef __ASM_SYNC_BITOPS_H__ 38c2ecf20Sopenharmony_ci#define __ASM_SYNC_BITOPS_H__ 48c2ecf20Sopenharmony_ci 58c2ecf20Sopenharmony_ci#include <asm/bitops.h> 68c2ecf20Sopenharmony_ci#include <asm/cmpxchg.h> 78c2ecf20Sopenharmony_ci 88c2ecf20Sopenharmony_ci/* sync_bitops functions are equivalent to the SMP implementation of the 98c2ecf20Sopenharmony_ci * original functions, independently from CONFIG_SMP being defined. 108c2ecf20Sopenharmony_ci * 118c2ecf20Sopenharmony_ci * We need them because _set_bit etc are not SMP safe if !CONFIG_SMP. But 128c2ecf20Sopenharmony_ci * under Xen you might be communicating with a completely external entity 138c2ecf20Sopenharmony_ci * who might be on another CPU (e.g. two uniprocessor guests communicating 148c2ecf20Sopenharmony_ci * via event channels and grant tables). So we need a variant of the bit 158c2ecf20Sopenharmony_ci * ops which are SMP safe even on a UP kernel. 168c2ecf20Sopenharmony_ci */ 178c2ecf20Sopenharmony_ci 188c2ecf20Sopenharmony_ci#define sync_set_bit(nr, p) set_bit(nr, p) 198c2ecf20Sopenharmony_ci#define sync_clear_bit(nr, p) clear_bit(nr, p) 208c2ecf20Sopenharmony_ci#define sync_change_bit(nr, p) change_bit(nr, p) 218c2ecf20Sopenharmony_ci#define sync_test_and_set_bit(nr, p) test_and_set_bit(nr, p) 228c2ecf20Sopenharmony_ci#define sync_test_and_clear_bit(nr, p) test_and_clear_bit(nr, p) 238c2ecf20Sopenharmony_ci#define sync_test_and_change_bit(nr, p) test_and_change_bit(nr, p) 248c2ecf20Sopenharmony_ci#define sync_test_bit(nr, addr) test_bit(nr, addr) 258c2ecf20Sopenharmony_ci#define arch_sync_cmpxchg arch_cmpxchg 268c2ecf20Sopenharmony_ci 278c2ecf20Sopenharmony_ci#endif 28