28 lines
1.1 KiB
C
28 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef __ASM_SYNC_BITOPS_H__
|
|
#define __ASM_SYNC_BITOPS_H__
|
|
|
|
#include <asm/bitops.h>
|
|
#include <asm/cmpxchg.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
|