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