| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef __ASM_SYNC_BITOPS_H__ |
| #define __ASM_SYNC_BITOPS_H__ |
| |
| #include <asm/bitops.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 sync_cmpxchg cmpxchg |
| |
| |
| #endif |
