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편집 파일: instrumented-lock.h

/* SPDX-License-Identifier: GPL-2.0 */ /* * This file provides wrappers with sanitizer instrumentation for bit * locking 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_LOCK_H #define _ASM_GENERIC_BITOPS_INSTRUMENTED_LOCK_H #include <linux/instrumented.h> /** * clear_bit_unlock - Clear a bit in memory, for unlock * @nr: the bit to set * @addr: the address to start counting from * * This operation is atomic and provides release barrier semantics. */ static inline void clear_bit_unlock(long nr, volatile unsigned long *addr) { kcsan_release(); instrument_atomic_write(addr + BIT_WORD(nr), sizeof(long)); arch_clear_bit_unlock(nr, addr); } /** * __clear_bit_unlock - Clears a bit in memory * @nr: Bit to clear * @addr: Address to start counting from * * This is a non-atomic operation but implies a release barrier before the * memory operation. It can be used for an unlock if no other CPUs can * concurrently modify other bits in the word. */ static inline void __clear_bit_unlock(long nr, volatile unsigned long *addr) { kcsan_release(); instrument_write(addr + BIT_WORD(nr), sizeof(long)); arch___clear_bit_unlock(nr, addr); } /** * test_and_set_bit_lock - Set a bit and return its old value, for lock * @nr: Bit to set * @addr: Address to count from * * This operation is atomic and provides acquire barrier semantics if * the returned value is 0. * It can be used to implement bit locks. */ static inline bool test_and_set_bit_lock(long nr, volatile unsigned long *addr) { instrument_atomic_read_write(addr + BIT_WORD(nr), sizeof(long)); return arch_test_and_set_bit_lock(nr, addr); } #if defined(arch_clear_bit_unlock_is_negative_byte) /** * clear_bit_unlock_is_negative_byte - Clear a bit in memory and test if bottom * byte is negative, for unlock. * @nr: the bit to clear * @addr: the address to start counting from * * This operation is atomic and provides release barrier semantics. * * This is a bit of a one-trick-pony for the filemap code, which clears * PG_locked and tests PG_waiters, */ static inline bool clear_bit_unlock_is_negative_byte(long nr, volatile unsigned long *addr) { kcsan_release(); instrument_atomic_write(addr + BIT_WORD(nr), sizeof(long)); return arch_clear_bit_unlock_is_negative_byte(nr, addr); } /* Let everybody know we have it. */ #define clear_bit_unlock_is_negative_byte clear_bit_unlock_is_negative_byte #endif #endif /* _ASM_GENERIC_BITOPS_INSTRUMENTED_LOCK_H */