104 lines · c
1/* SPDX-License-Identifier: GPL-2.0 */2 3/*4 * This file provides wrappers with sanitizer instrumentation for atomic bit5 * operations.6 *7 * To use this functionality, an arch's bitops.h file needs to define each of8 * 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_H12#define _ASM_GENERIC_BITOPS_INSTRUMENTED_ATOMIC_H13 14#include <linux/instrumented.h>15 16/**17 * set_bit - Atomically set a bit in memory18 * @nr: the bit to set19 * @addr: the address to start counting from20 *21 * This is a relaxed atomic operation (no implied memory barriers).22 *23 * Note that @nr may be almost arbitrarily large; this function is not24 * restricted to acting on a single-word quantity.25 */26static __always_inline void set_bit(long nr, volatile unsigned long *addr)27{28 instrument_atomic_write(addr + BIT_WORD(nr), sizeof(long));29 arch_set_bit(nr, addr);30}31 32/**33 * clear_bit - Clears a bit in memory34 * @nr: Bit to clear35 * @addr: Address to start counting from36 *37 * This is a relaxed atomic operation (no implied memory barriers).38 */39static __always_inline void clear_bit(long nr, volatile unsigned long *addr)40{41 instrument_atomic_write(addr + BIT_WORD(nr), sizeof(long));42 arch_clear_bit(nr, addr);43}44 45/**46 * change_bit - Toggle a bit in memory47 * @nr: Bit to change48 * @addr: Address to start counting from49 *50 * This is a relaxed atomic operation (no implied memory barriers).51 *52 * Note that @nr may be almost arbitrarily large; this function is not53 * restricted to acting on a single-word quantity.54 */55static __always_inline void change_bit(long nr, volatile unsigned long *addr)56{57 instrument_atomic_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 value63 * @nr: Bit to set64 * @addr: Address to count from65 *66 * This is an atomic fully-ordered operation (implied full memory barrier).67 */68static __always_inline bool test_and_set_bit(long nr, volatile unsigned long *addr)69{70 kcsan_mb();71 instrument_atomic_read_write(addr + BIT_WORD(nr), sizeof(long));72 return arch_test_and_set_bit(nr, addr);73}74 75/**76 * test_and_clear_bit - Clear a bit and return its old value77 * @nr: Bit to clear78 * @addr: Address to count from79 *80 * This is an atomic fully-ordered operation (implied full memory barrier).81 */82static __always_inline bool test_and_clear_bit(long nr, volatile unsigned long *addr)83{84 kcsan_mb();85 instrument_atomic_read_write(addr + BIT_WORD(nr), sizeof(long));86 return arch_test_and_clear_bit(nr, addr);87}88 89/**90 * test_and_change_bit - Change a bit and return its old value91 * @nr: Bit to change92 * @addr: Address to count from93 *94 * This is an atomic fully-ordered operation (implied full memory barrier).95 */96static __always_inline bool test_and_change_bit(long nr, volatile unsigned long *addr)97{98 kcsan_mb();99 instrument_atomic_read_write(addr + BIT_WORD(nr), sizeof(long));100 return arch_test_and_change_bit(nr, addr);101}102 103#endif /* _ASM_GENERIC_BITOPS_INSTRUMENTED_NON_ATOMIC_H */104