#ifndef _ASM_GENERIC_BITOPS_LOCK_H_#define _ASM_GENERIC_BITOPS_LOCK_H_ /** * 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. * It can be used to implement bit locks. */#define test_and_set_bit_lock(nr, addr)	test_and_set_bit(nr, addr) /** * 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. */#define clear_bit_unlock(nr, addr)	\do {					\	smp_mb__before_atomic();	\	clear_bit(nr, addr);		\} while (0) /** * __clear_bit_unlock - Clear a bit in memory, for unlock * @nr: the bit to set * @addr: the address to start counting from * * A weaker form of clear_bit_unlock() as used by __bit_lock_unlock(). If all * the bits in the word are protected by this lock some archs can use weaker * ops to safely unlock. * * See for example x86's implementation. */#define __clear_bit_unlock(nr, addr)	\do {					\	smp_mb__before_atomic();	\	clear_bit(nr, addr);		\} while (0) #endif /* _ASM_GENERIC_BITOPS_LOCK_H_ */