/* SPDX-License-Identifier: GPL-2.0 */
/*
* This file provides wrappers with sanitizer instrumentation for atomic bit
* operations .
*
* To use this functionality , an arch ' s bitops . h file needs to define each of
* the below bit operations with an arch_ prefix ( e . g . arch_set_bit ( ) ,
* arch___set_bit ( ) , etc . ) .
*/
#ifndef _ASM_GENERIC_BITOPS_INSTRUMENTED_ATOMIC_H
#define _ASM_GENERIC_BITOPS_INSTRUMENTED_ATOMIC_H
#include <linux/instrumented.h>
/**
* set_bit - Atomically set a bit in memory
* @ nr : the bit to set
* @ addr : the address to start counting from
*
* This is a relaxed atomic operation ( no implied memory barriers ) .
*
* Note that @ nr may be almost arbitrarily large ; this function is not
* restricted to acting on a single - word quantity .
*/
static __always_inline void set_bit(long nr, volatile unsigned long *addr)
{
instrument_atomic_write(addr + BIT_WORD(nr), sizeof (long ));
arch_set_bit(nr, addr);
}
/**
* clear_bit - Clears a bit in memory
* @ nr : Bit to clear
* @ addr : Address to start counting from
*
* This is a relaxed atomic operation ( no implied memory barriers ) .
*/
static __always_inline void clear_bit(long nr, volatile unsigned long *addr)
{
instrument_atomic_write(addr + BIT_WORD(nr), sizeof (long ));
arch_clear_bit(nr, addr);
}
/**
* change_bit - Toggle a bit in memory
* @ nr : Bit to change
* @ addr : Address to start counting from
*
* This is a relaxed atomic operation ( no implied memory barriers ) .
*
* Note that @ nr may be almost arbitrarily large ; this function is not
* restricted to acting on a single - word quantity .
*/
static __always_inline void change_bit(long nr, volatile unsigned long *addr)
{
instrument_atomic_write(addr + BIT_WORD(nr), sizeof (long ));
arch_change_bit(nr, addr);
}
/**
* test_and_set_bit - Set a bit and return its old value
* @ nr : Bit to set
* @ addr : Address to count from
*
* This is an atomic fully - ordered operation ( implied full memory barrier ) .
*/
static __always_inline bool test_and_set_bit(long nr, volatile unsigned long *addr)
{
kcsan_mb();
instrument_atomic_read_write(addr + BIT_WORD(nr), sizeof (long ));
return arch_test_and_set_bit(nr, addr);
}
/**
* test_and_clear_bit - Clear a bit and return its old value
* @ nr : Bit to clear
* @ addr : Address to count from
*
* This is an atomic fully - ordered operation ( implied full memory barrier ) .
*/
static __always_inline bool test_and_clear_bit(long nr, volatile unsigned long *addr)
{
kcsan_mb();
instrument_atomic_read_write(addr + BIT_WORD(nr), sizeof (long ));
return arch_test_and_clear_bit(nr, addr);
}
/**
* test_and_change_bit - Change a bit and return its old value
* @ nr : Bit to change
* @ addr : Address to count from
*
* This is an atomic fully - ordered operation ( implied full memory barrier ) .
*/
static __always_inline bool test_and_change_bit(long nr, volatile unsigned long *addr)
{
kcsan_mb();
instrument_atomic_read_write(addr + BIT_WORD(nr), sizeof (long ));
return arch_test_and_change_bit(nr, addr);
}
#endif /* _ASM_GENERIC_BITOPS_INSTRUMENTED_NON_ATOMIC_H */
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(vorverarbeitet am 2026-09-30)
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