From 534b67238eebe59e9142c95a4b25e96154565854 Mon Sep 17 00:00:00 2001
From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Thu, 11 Nov 2010 14:05:08 -0800
Subject: [PATCH] --- yaml --- r: 221714 b: refs/heads/master c:
 3f9d35b9514da6757ca98831372518f9eeb71b33 h: refs/heads/master v: v3

---
 [refs]                       |  2 +-
 trunk/include/linux/atomic.h | 37 ++++++++++++++++++++++++++++++++++++
 2 files changed, 38 insertions(+), 1 deletion(-)
 create mode 100644 trunk/include/linux/atomic.h

diff --git a/[refs] b/[refs]
index 3db5c1bacc6e..d303ab2b0897 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 8705a1baf78287eceeb00bc29401d0ae6a03f213
+refs/heads/master: 3f9d35b9514da6757ca98831372518f9eeb71b33
diff --git a/trunk/include/linux/atomic.h b/trunk/include/linux/atomic.h
new file mode 100644
index 000000000000..96c038e43d66
--- /dev/null
+++ b/trunk/include/linux/atomic.h
@@ -0,0 +1,37 @@
+#ifndef _LINUX_ATOMIC_H
+#define _LINUX_ATOMIC_H
+#include <asm/atomic.h>
+
+/**
+ * atomic_inc_not_zero_hint - increment if not null
+ * @v: pointer of type atomic_t
+ * @hint: probable value of the atomic before the increment
+ *
+ * This version of atomic_inc_not_zero() gives a hint of probable
+ * value of the atomic. This helps processor to not read the memory
+ * before doing the atomic read/modify/write cycle, lowering
+ * number of bus transactions on some arches.
+ *
+ * Returns: 0 if increment was not done, 1 otherwise.
+ */
+#ifndef atomic_inc_not_zero_hint
+static inline int atomic_inc_not_zero_hint(atomic_t *v, int hint)
+{
+	int val, c = hint;
+
+	/* sanity test, should be removed by compiler if hint is a constant */
+	if (!hint)
+		return atomic_inc_not_zero(v);
+
+	do {
+		val = atomic_cmpxchg(v, c, c + 1);
+		if (val == c)
+			return 1;
+		c = val;
+	} while (c);
+
+	return 0;
+}
+#endif
+
+#endif /* _LINUX_ATOMIC_H */