1*b2441318SGreg Kroah-Hartman /* SPDX-License-Identifier: GPL-2.0 */ 2e54d2f61SStefano Stabellini #ifndef __ASM_SYNC_BITOPS_H__ 3e54d2f61SStefano Stabellini #define __ASM_SYNC_BITOPS_H__ 4e54d2f61SStefano Stabellini 5e54d2f61SStefano Stabellini #include <asm/bitops.h> 6e54d2f61SStefano Stabellini 7e54d2f61SStefano Stabellini /* sync_bitops functions are equivalent to the SMP implementation of the 8e54d2f61SStefano Stabellini * original functions, independently from CONFIG_SMP being defined. 9e54d2f61SStefano Stabellini * 10e54d2f61SStefano Stabellini * We need them because _set_bit etc are not SMP safe if !CONFIG_SMP. But 11e54d2f61SStefano Stabellini * under Xen you might be communicating with a completely external entity 12e54d2f61SStefano Stabellini * who might be on another CPU (e.g. two uniprocessor guests communicating 13e54d2f61SStefano Stabellini * via event channels and grant tables). So we need a variant of the bit 14e54d2f61SStefano Stabellini * ops which are SMP safe even on a UP kernel. 15e54d2f61SStefano Stabellini */ 16e54d2f61SStefano Stabellini 17e54d2f61SStefano Stabellini #define sync_set_bit(nr, p) _set_bit(nr, p) 18e54d2f61SStefano Stabellini #define sync_clear_bit(nr, p) _clear_bit(nr, p) 19e54d2f61SStefano Stabellini #define sync_change_bit(nr, p) _change_bit(nr, p) 20e54d2f61SStefano Stabellini #define sync_test_and_set_bit(nr, p) _test_and_set_bit(nr, p) 21e54d2f61SStefano Stabellini #define sync_test_and_clear_bit(nr, p) _test_and_clear_bit(nr, p) 22e54d2f61SStefano Stabellini #define sync_test_and_change_bit(nr, p) _test_and_change_bit(nr, p) 23e54d2f61SStefano Stabellini #define sync_test_bit(nr, addr) test_bit(nr, addr) 24e54d2f61SStefano Stabellini #define sync_cmpxchg cmpxchg 25e54d2f61SStefano Stabellini 26e54d2f61SStefano Stabellini 27e54d2f61SStefano Stabellini #endif 28