1 /* SPDX-License-Identifier: GPL-2.0 */
4 * This file provides wrappers with sanitizer instrumentation for atomic bit
7 * To use this functionality, an arch's bitops.h file needs to define each of
8 * the below bit operations with an arch_ prefix (e.g. arch_set_bit(),
9 * arch___set_bit(), etc.).
11 #ifndef _ASM_GENERIC_BITOPS_INSTRUMENTED_ATOMIC_H
12 #define _ASM_GENERIC_BITOPS_INSTRUMENTED_ATOMIC_H
14 #include <linux/instrumented.h>
17 * set_bit - Atomically set a bit in memory
19 * @addr: the address to start counting from
21 * This is a relaxed atomic operation (no implied memory barriers).
23 * Note that @nr may be almost arbitrarily large; this function is not
24 * restricted to acting on a single-word quantity.
26 static inline void set_bit(long nr
, volatile unsigned long *addr
)
28 instrument_atomic_write(addr
+ BIT_WORD(nr
), sizeof(long));
29 arch_set_bit(nr
, addr
);
33 * clear_bit - Clears a bit in memory
35 * @addr: Address to start counting from
37 * This is a relaxed atomic operation (no implied memory barriers).
39 static inline void clear_bit(long nr
, volatile unsigned long *addr
)
41 instrument_atomic_write(addr
+ BIT_WORD(nr
), sizeof(long));
42 arch_clear_bit(nr
, addr
);
46 * change_bit - Toggle a bit in memory
48 * @addr: Address to start counting from
50 * This is a relaxed atomic operation (no implied memory barriers).
52 * Note that @nr may be almost arbitrarily large; this function is not
53 * restricted to acting on a single-word quantity.
55 static inline void change_bit(long nr
, volatile unsigned long *addr
)
57 instrument_atomic_write(addr
+ BIT_WORD(nr
), sizeof(long));
58 arch_change_bit(nr
, addr
);
62 * test_and_set_bit - Set a bit and return its old value
64 * @addr: Address to count from
66 * This is an atomic fully-ordered operation (implied full memory barrier).
68 static inline bool test_and_set_bit(long nr
, volatile unsigned long *addr
)
70 instrument_atomic_read_write(addr
+ BIT_WORD(nr
), sizeof(long));
71 return arch_test_and_set_bit(nr
, addr
);
75 * test_and_clear_bit - Clear a bit and return its old value
77 * @addr: Address to count from
79 * This is an atomic fully-ordered operation (implied full memory barrier).
81 static inline bool test_and_clear_bit(long nr
, volatile unsigned long *addr
)
83 instrument_atomic_read_write(addr
+ BIT_WORD(nr
), sizeof(long));
84 return arch_test_and_clear_bit(nr
, addr
);
88 * test_and_change_bit - Change a bit and return its old value
90 * @addr: Address to count from
92 * This is an atomic fully-ordered operation (implied full memory barrier).
94 static inline bool test_and_change_bit(long nr
, volatile unsigned long *addr
)
96 instrument_atomic_read_write(addr
+ BIT_WORD(nr
), sizeof(long));
97 return arch_test_and_change_bit(nr
, addr
);
100 #endif /* _ASM_GENERIC_BITOPS_INSTRUMENTED_NON_ATOMIC_H */