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       1                 :            : /* SPDX-License-Identifier: GPL-2.0 */
       2                 :            : 
       3                 :            : /*
       4                 :            :  * This file provides wrappers with sanitizer instrumentation for atomic bit
       5                 :            :  * operations.
       6                 :            :  *
       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.).
      10                 :            :  */
      11                 :            : #ifndef _ASM_GENERIC_BITOPS_INSTRUMENTED_ATOMIC_H
      12                 :            : #define _ASM_GENERIC_BITOPS_INSTRUMENTED_ATOMIC_H
      13                 :            : 
      14                 :            : #include <linux/kasan-checks.h>
      15                 :            : 
      16                 :            : /**
      17                 :            :  * set_bit - Atomically set a bit in memory
      18                 :            :  * @nr: the bit to set
      19                 :            :  * @addr: the address to start counting from
      20                 :            :  *
      21                 :            :  * This is a relaxed atomic operation (no implied memory barriers).
      22                 :            :  *
      23                 :            :  * Note that @nr may be almost arbitrarily large; this function is not
      24                 :            :  * restricted to acting on a single-word quantity.
      25                 :            :  */
      26                 :   11715968 : static inline void set_bit(long nr, volatile unsigned long *addr)
      27                 :            : {
      28         [ #  # ]:   11715968 :         kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
      29         [ +  + ]:   11715968 :         arch_set_bit(nr, addr);
      30                 :   11715158 : }
      31                 :            : 
      32                 :            : /**
      33                 :            :  * clear_bit - Clears a bit in memory
      34                 :            :  * @nr: Bit to clear
      35                 :            :  * @addr: Address to start counting from
      36                 :            :  *
      37                 :            :  * This is a relaxed atomic operation (no implied memory barriers).
      38                 :            :  */
      39                 :    5834283 : static inline void clear_bit(long nr, volatile unsigned long *addr)
      40                 :            : {
      41         [ #  # ]:    5834283 :         kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
      42         [ +  + ]:    5834283 :         arch_clear_bit(nr, addr);
      43                 :    5834187 : }
      44                 :            : 
      45                 :            : /**
      46                 :            :  * change_bit - Toggle a bit in memory
      47                 :            :  * @nr: Bit to change
      48                 :            :  * @addr: Address to start counting from
      49                 :            :  *
      50                 :            :  * This is a relaxed atomic operation (no implied memory barriers).
      51                 :            :  *
      52                 :            :  * Note that @nr may be almost arbitrarily large; this function is not
      53                 :            :  * restricted to acting on a single-word quantity.
      54                 :            :  */
      55                 :            : static inline void change_bit(long nr, volatile unsigned long *addr)
      56                 :            : {
      57                 :            :         kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
      58                 :            :         arch_change_bit(nr, addr);
      59                 :            : }
      60                 :            : 
      61                 :            : /**
      62                 :            :  * test_and_set_bit - Set a bit and return its old value
      63                 :            :  * @nr: Bit to set
      64                 :            :  * @addr: Address to count from
      65                 :            :  *
      66                 :            :  * This is an atomic fully-ordered operation (implied full memory barrier).
      67                 :            :  */
      68                 :    1558137 : static inline bool test_and_set_bit(long nr, volatile unsigned long *addr)
      69                 :            : {
      70                 :    1558137 :         kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
      71                 :    1558137 :         return arch_test_and_set_bit(nr, addr);
      72                 :            : }
      73                 :            : 
      74                 :            : /**
      75                 :            :  * test_and_clear_bit - Clear a bit and return its old value
      76                 :            :  * @nr: Bit to clear
      77                 :            :  * @addr: Address to count from
      78                 :            :  *
      79                 :            :  * This is an atomic fully-ordered operation (implied full memory barrier).
      80                 :            :  */
      81                 :    1932680 : static inline bool test_and_clear_bit(long nr, volatile unsigned long *addr)
      82                 :            : {
      83                 :    1932680 :         kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
      84                 :    1932680 :         return arch_test_and_clear_bit(nr, addr);
      85                 :            : }
      86                 :            : 
      87                 :            : /**
      88                 :            :  * test_and_change_bit - Change a bit and return its old value
      89                 :            :  * @nr: Bit to change
      90                 :            :  * @addr: Address to count from
      91                 :            :  *
      92                 :            :  * This is an atomic fully-ordered operation (implied full memory barrier).
      93                 :            :  */
      94                 :            : static inline bool test_and_change_bit(long nr, volatile unsigned long *addr)
      95                 :            : {
      96                 :            :         kasan_check_write(addr + BIT_WORD(nr), sizeof(long));
      97                 :            :         return arch_test_and_change_bit(nr, addr);
      98                 :            : }
      99                 :            : 
     100                 :            : #endif /* _ASM_GENERIC_BITOPS_INSTRUMENTED_NON_ATOMIC_H */