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| 2 |
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| 3 | |
| 4 | * This file provides wrappers with sanitizer instrumentation for atomic bit
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| 5 | * operations.
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| 6 | *
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| 7 | * To use this functionality, an arch's bitops.h file needs to define each of
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| 8 | * the below bit operations with an arch_ prefix (e.g. arch_set_bit(),
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| 9 | * arch___set_bit(), etc.).
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| 10 |
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| 11 | #ifndef _ASM_GENERIC_BITOPS_INSTRUMENTED_ATOMIC_H
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| 12 | #define _ASM_GENERIC_BITOPS_INSTRUMENTED_ATOMIC_H
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| 13 |
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| 14 | #include <linux/instrumented.h>
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| 15 |
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| 16 | |
| 17 | * set_bit - Atomically set a bit in memory
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| 18 | * @nr: the bit to set
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| 19 | * @addr: the address to start counting from
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| 20 | *
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| 21 | * This is a relaxed atomic operation (no implied memory barriers).
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| 22 | *
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| 23 | * Note that @nr may be almost arbitrarily large; this function is not
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| 24 | * restricted to acting on a single-word quantity.
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| 25 |
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| 26 | static __always_inline void set_bit(long nr, volatile unsigned long *addr)
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| 27 | {
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| 28 | instrument_atomic_write(addr + BIT_WORD(nr), sizeof(long));
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| 29 | arch_set_bit(nr, addr);
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| 30 | }
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| 31 |
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| 32 | |
| 33 | * clear_bit - Clears a bit in memory
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| 34 | * @nr: Bit to clear
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| 35 | * @addr: Address to start counting from
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| 36 | *
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| 37 | * This is a relaxed atomic operation (no implied memory barriers).
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| 38 |
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| 39 | static __always_inline void clear_bit(long nr, volatile unsigned long *addr)
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| 40 | {
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| 41 | instrument_atomic_write(addr + BIT_WORD(nr), sizeof(long));
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| 42 | arch_clear_bit(nr, addr);
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| 43 | }
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| 44 |
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| 45 | |
| 46 | * change_bit - Toggle a bit in memory
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| 47 | * @nr: Bit to change
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| 48 | * @addr: Address to start counting from
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| 49 | *
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| 50 | * This is a relaxed atomic operation (no implied memory barriers).
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| 51 | *
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| 52 | * Note that @nr may be almost arbitrarily large; this function is not
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| 53 | * restricted to acting on a single-word quantity.
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| 54 |
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| 55 | static __always_inline void change_bit(long nr, volatile unsigned long *addr)
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| 56 | {
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| 57 | instrument_atomic_write(addr + BIT_WORD(nr), sizeof(long));
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| 58 | arch_change_bit(nr, addr);
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| 59 | }
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| 60 |
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| 61 | |
| 62 | * test_and_set_bit - Set a bit and return its old value
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| 63 | * @nr: Bit to set
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| 64 | * @addr: Address to count from
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| 65 | *
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| 66 | * This is an atomic fully-ordered operation (implied full memory barrier).
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| 67 |
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| 68 | static __always_inline bool test_and_set_bit(long nr, volatile unsigned long *addr)
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| 69 | {
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| 70 | kcsan_mb();
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| 71 | instrument_atomic_read_write(addr + BIT_WORD(nr), sizeof(long));
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| 72 | return arch_test_and_set_bit(nr, addr);
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| 73 | }
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| 74 |
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| 75 | |
| 76 | * test_and_clear_bit - Clear a bit and return its old value
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| 77 | * @nr: Bit to clear
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| 78 | * @addr: Address to count from
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| 79 | *
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| 80 | * This is an atomic fully-ordered operation (implied full memory barrier).
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| 81 |
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| 82 | static __always_inline bool test_and_clear_bit(long nr, volatile unsigned long *addr)
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| 83 | {
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| 84 | kcsan_mb();
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| 85 | instrument_atomic_read_write(addr + BIT_WORD(nr), sizeof(long));
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| 86 | return arch_test_and_clear_bit(nr, addr);
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| 87 | }
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| 88 |
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| 89 | |
| 90 | * test_and_change_bit - Change a bit and return its old value
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| 91 | * @nr: Bit to change
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| 92 | * @addr: Address to count from
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| 93 | *
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| 94 | * This is an atomic fully-ordered operation (implied full memory barrier).
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| 95 |
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| 96 | static __always_inline bool test_and_change_bit(long nr, volatile unsigned long *addr)
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| 97 | {
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| 98 | kcsan_mb();
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| 99 | instrument_atomic_read_write(addr + BIT_WORD(nr), sizeof(long));
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| 100 | return arch_test_and_change_bit(nr, addr);
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| 101 | }
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| 102 |
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| 103 | #endif
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