include/asm-generic/bitops/instrumented-atomic.h

Source file repositories/reference/linux-study-clean/include/asm-generic/bitops/instrumented-atomic.h

File Facts

System
Linux kernel
Corpus path
include/asm-generic/bitops/instrumented-atomic.h
Extension
.h
Size
3054 bytes
Lines
104
Domain
Repository Root And Misc
Bucket
include
Inferred role
Repository Root And Misc: implementation source
Status
source implementation candidate

Why This File Exists

Top-level or miscellaneous repository surface. Use this as map coverage unless a later manual pass promotes the file into a deeper subsystem dossier.

Dependency Surface

Detected Declarations

Annotated Snippet

#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);

Annotation

Implementation Notes