From 8e4bff4cab0ddac6060645b0715210484d02ff40 Mon Sep 17 00:00:00 2001
From: Yuval Adam <_@yuv.al>
Date: Wed, 30 Aug 2017 08:25:59 +0000
Subject: Initial file dump from open source release

---
 include/asm-generic/bitops/lock.h | 45 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100644 include/asm-generic/bitops/lock.h

(limited to 'include/asm-generic/bitops/lock.h')

diff --git a/include/asm-generic/bitops/lock.h b/include/asm-generic/bitops/lock.h
new file mode 100644
index 00000000..308a9e22
--- /dev/null
+++ b/include/asm-generic/bitops/lock.h
@@ -0,0 +1,45 @@
+#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_clear_bit();	\
+	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
+ *
+ * This operation is like clear_bit_unlock, however it is not atomic.
+ * It does provide release barrier semantics so it can be used to unlock
+ * a bit lock, however it would only be used if no other CPU can modify
+ * any bits in the memory until the lock is released (a good example is
+ * if the bit lock itself protects access to the other bits in the word).
+ */
+#define __clear_bit_unlock(nr, addr)	\
+do {					\
+	smp_mb();			\
+	__clear_bit(nr, addr);		\
+} while (0)
+
+#endif /* _ASM_GENERIC_BITOPS_LOCK_H_ */
+
-- 
cgit v1.3.1