xref: /openbmc/linux/arch/arm/include/asm/sync_bitops.h (revision b34e08d5)
1 #ifndef __ASM_SYNC_BITOPS_H__
2 #define __ASM_SYNC_BITOPS_H__
3 
4 #include <asm/bitops.h>
5 
6 /* sync_bitops functions are equivalent to the SMP implementation of the
7  * original functions, independently from CONFIG_SMP being defined.
8  *
9  * We need them because _set_bit etc are not SMP safe if !CONFIG_SMP. But
10  * under Xen you might be communicating with a completely external entity
11  * who might be on another CPU (e.g. two uniprocessor guests communicating
12  * via event channels and grant tables). So we need a variant of the bit
13  * ops which are SMP safe even on a UP kernel.
14  */
15 
16 #define sync_set_bit(nr, p)		_set_bit(nr, p)
17 #define sync_clear_bit(nr, p)		_clear_bit(nr, p)
18 #define sync_change_bit(nr, p)		_change_bit(nr, p)
19 #define sync_test_and_set_bit(nr, p)	_test_and_set_bit(nr, p)
20 #define sync_test_and_clear_bit(nr, p)	_test_and_clear_bit(nr, p)
21 #define sync_test_and_change_bit(nr, p)	_test_and_change_bit(nr, p)
22 #define sync_test_bit(nr, addr)		test_bit(nr, addr)
23 #define sync_cmpxchg			cmpxchg
24 
25 
26 #endif
27