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- #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_ */
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