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[linux/fpc-iii.git] / arch / arm64 / include / asm / sync_bitops.h
blobeee31a9f72a55111b455e28ed4eaae2cc8178217
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __ASM_SYNC_BITOPS_H__
3 #define __ASM_SYNC_BITOPS_H__
5 #include <asm/bitops.h>
6 #include <asm/cmpxchg.h>
8 /* sync_bitops functions are equivalent to the SMP implementation of the
9 * original functions, independently from CONFIG_SMP being defined.
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.
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 sync_cmpxchg cmpxchg
27 #endif