From 456d57a4dffc3231b7fe10714189736cf53c3320 Mon Sep 17 00:00:00 2001
From: Sumit Singh <sumsingh@nvidia.com>
Date: Mon, 21 Apr 2014 15:22:15 +0530
Subject: llist: defining relaxed version of llist_empty

Defining relaxed version of llist_empty as llist_empty_relaxed,
which will be used for power-optimization.

bug 1440421

Change-Id: I1c4c34b381e49775ed08ddd606d9744a7e7e1fba
Signed-off-by: Sumit Singh <sumsingh@nvidia.com>
Reviewed-on: http://git-master/r/426483
Reviewed-by: Sri Krishna Chowdary <schowdary@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Alexander Van Brunt <avanbrunt@nvidia.com>
Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
---
 include/linux/llist.h | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'include/linux')

diff --git a/include/linux/llist.h b/include/linux/llist.h
index 97cf31da6..197228346 100644
--- a/include/linux/llist.h
+++ b/include/linux/llist.h
@@ -57,6 +57,7 @@
 
 #include <linux/kernel.h>
 #include <asm/cmpxchg.h>
+#include <asm/relaxed.h>
 
 struct llist_head {
 	struct llist_node *first;
@@ -160,6 +161,11 @@ static inline bool llist_empty(const struct llist_head *head)
 	return ACCESS_ONCE(head->first) == NULL;
 }
 
+static inline bool llist_empty_relaxed(const struct llist_head *head)
+{
+	return (void *)cpu_relaxed_read_long(&head->first) == NULL;
+}
+
 static inline struct llist_node *llist_next(struct llist_node *node)
 {
 	return node->next;
-- 
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