projects / mirror_ubuntu-focal-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| e54d2f61 SS |
2 | #ifndef __ASM_SYNC_BITOPS_H__ |
| 3 | #define __ASM_SYNC_BITOPS_H__ | |
| 4 | ||
| 5 | #include <asm/bitops.h> | |
| e54d2f61 SS |
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 sync_cmpxchg cmpxchg | |
| 25 | ||
| 26 | ||
| 27 | #endif |