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- /* SPDX-License-Identifier: GPL-2.0 */
- #ifndef __ASM_SYNC_BITOPS_H__
- #define __ASM_SYNC_BITOPS_H__
- #include <asm/bitops.h>
- #include <asm/cmpxchg.h>
- /* sync_bitops functions are equivalent to the SMP implementation of the
- * original functions, independently from CONFIG_SMP being defined.
- *
- * We need them because _set_bit etc are not SMP safe if !CONFIG_SMP. But
- * under Xen you might be communicating with a completely external entity
- * who might be on another CPU (e.g. two uniprocessor guests communicating
- * via event channels and grant tables). So we need a variant of the bit
- * ops which are SMP safe even on a UP kernel.
- */
- #define sync_set_bit(nr, p) set_bit(nr, p)
- #define sync_clear_bit(nr, p) clear_bit(nr, p)
- #define sync_change_bit(nr, p) change_bit(nr, p)
- #define sync_test_and_set_bit(nr, p) test_and_set_bit(nr, p)
- #define sync_test_and_clear_bit(nr, p) test_and_clear_bit(nr, p)
- #define sync_test_and_change_bit(nr, p) test_and_change_bit(nr, p)
- #define sync_test_bit(nr, addr) test_bit(nr, addr)
- #define arch_sync_cmpxchg arch_cmpxchg
- #endif
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