| Kyle Swenson | 8d8f654 | 2021-03-15 11:02:55 -0600 | [diff] [blame^] | 1 | #ifndef __ASM_SYNC_BITOPS_H__ |
| 2 | #define __ASM_SYNC_BITOPS_H__ |
| 3 | |
| 4 | #include <asm/bitops.h> |
| 5 | #include <asm/cmpxchg.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 sync_cmpxchg cmpxchg |
| 25 | |
| 26 | #endif |