1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_GENERIC_BITOPS_ATOMIC_H_
3 #define _ASM_GENERIC_BITOPS_ATOMIC_H_
5 #include <linux/atomic.h>
6 #include <linux/compiler.h>
7 #include <asm/barrier.h>
10 * Implementation of atomic bitops using atomic-fetch ops.
11 * See Documentation/atomic_bitops.txt for details.
14 static inline void set_bit(unsigned int nr, volatile unsigned long *p)
17 atomic_long_or(BIT_MASK(nr), (atomic_long_t *)p);
20 static inline void clear_bit(unsigned int nr, volatile unsigned long *p)
23 atomic_long_andnot(BIT_MASK(nr), (atomic_long_t *)p);
26 static inline void change_bit(unsigned int nr, volatile unsigned long *p)
29 atomic_long_xor(BIT_MASK(nr), (atomic_long_t *)p);
32 static inline int test_and_set_bit(unsigned int nr, volatile unsigned long *p)
35 unsigned long mask = BIT_MASK(nr);
38 if (READ_ONCE(*p) & mask)
41 old = atomic_long_fetch_or(mask, (atomic_long_t *)p);
42 return !!(old & mask);
45 static inline int test_and_clear_bit(unsigned int nr, volatile unsigned long *p)
48 unsigned long mask = BIT_MASK(nr);
51 if (!(READ_ONCE(*p) & mask))
54 old = atomic_long_fetch_andnot(mask, (atomic_long_t *)p);
55 return !!(old & mask);
58 static inline int test_and_change_bit(unsigned int nr, volatile unsigned long *p)
61 unsigned long mask = BIT_MASK(nr);
64 old = atomic_long_fetch_xor(mask, (atomic_long_t *)p);
65 return !!(old & mask);
68 #endif /* _ASM_GENERIC_BITOPS_ATOMIC_H */