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