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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
9f54ad66 SS |
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 sync_cmpxchg cmpxchg | |
26 | ||
27 | #endif |