Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / include / linux / bit_spinlock.h

diff --git a/kernel/include/linux/bit_spinlock.h b/kernel/include/linux/bit_spinlock.h
new file mode 100644 (file)
index 0000000..3b5bafc
--- /dev/null
+++ b/kernel/include/linux/bit_spinlock.h
@@ -0,0 +1,100 @@
+#ifndef __LINUX_BIT_SPINLOCK_H
+#define __LINUX_BIT_SPINLOCK_H
+
+#include <linux/kernel.h>
+#include <linux/preempt.h>
+#include <linux/atomic.h>
+#include <linux/bug.h>
+
+/*
+ *  bit-based spin_lock()
+ *
+ * Don't use this unless you really need to: spin_lock() and spin_unlock()
+ * are significantly faster.
+ */
+static inline void bit_spin_lock(int bitnum, unsigned long *addr)
+{
+       /*
+        * Assuming the lock is uncontended, this never enters
+        * the body of the outer loop. If it is contended, then
+        * within the inner loop a non-atomic test is used to
+        * busywait with less bus contention for a good time to
+        * attempt to acquire the lock bit.
+        */
+       preempt_disable();
+#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
+       while (unlikely(test_and_set_bit_lock(bitnum, addr))) {
+               preempt_enable();
+               do {
+                       cpu_relax();
+               } while (test_bit(bitnum, addr));
+               preempt_disable();
+       }
+#endif
+       __acquire(bitlock);
+}
+
+/*
+ * Return true if it was acquired
+ */
+static inline int bit_spin_trylock(int bitnum, unsigned long *addr)
+{
+       preempt_disable();
+#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
+       if (unlikely(test_and_set_bit_lock(bitnum, addr))) {
+               preempt_enable();
+               return 0;
+       }
+#endif
+       __acquire(bitlock);
+       return 1;
+}
+
+/*
+ *  bit-based spin_unlock()
+ */
+static inline void bit_spin_unlock(int bitnum, unsigned long *addr)
+{
+#ifdef CONFIG_DEBUG_SPINLOCK
+       BUG_ON(!test_bit(bitnum, addr));
+#endif
+#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
+       clear_bit_unlock(bitnum, addr);
+#endif
+       preempt_enable();
+       __release(bitlock);
+}
+
+/*
+ *  bit-based spin_unlock()
+ *  non-atomic version, which can be used eg. if the bit lock itself is
+ *  protecting the rest of the flags in the word.
+ */
+static inline void __bit_spin_unlock(int bitnum, unsigned long *addr)
+{
+#ifdef CONFIG_DEBUG_SPINLOCK
+       BUG_ON(!test_bit(bitnum, addr));
+#endif
+#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
+       __clear_bit_unlock(bitnum, addr);
+#endif
+       preempt_enable();
+       __release(bitlock);
+}
+
+/*
+ * Return true if the lock is held.
+ */
+static inline int bit_spin_is_locked(int bitnum, unsigned long *addr)
+{
+#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
+       return test_bit(bitnum, addr);
+#elif defined CONFIG_PREEMPT_COUNT
+       return preempt_count();
+#else
+       return 1;
+#endif
+}
+
+#endif /* __LINUX_BIT_SPINLOCK_H */
+