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
 7/* sync_bitops functions are equivalent to the SMP implementation of the
 8 * original functions, independently from CONFIG_SMP being defined.
 9 *
10 * We need them because _set_bit etc are not SMP safe if !CONFIG_SMP. But
11 * under Xen you might be communicating with a completely external entity
12 * who might be on another CPU (e.g. two uniprocessor guests communicating
13 * via event channels and grant tables). So we need a variant of the bit
14 * ops which are SMP safe even on a UP kernel.
15 */
16
17#define sync_set_bit(nr, p)		_set_bit(nr, p)
18#define sync_clear_bit(nr, p)		_clear_bit(nr, p)
19#define sync_change_bit(nr, p)		_change_bit(nr, p)
20#define sync_test_and_set_bit(nr, p)	_test_and_set_bit(nr, p)
21#define sync_test_and_clear_bit(nr, p)	_test_and_clear_bit(nr, p)
22#define sync_test_and_change_bit(nr, p)	_test_and_change_bit(nr, p)
23#define sync_test_bit(nr, addr)		test_bit(nr, addr)
24#define arch_sync_cmpxchg		arch_cmpxchg
25
26
27#endif