linux-kernel - [RESEND PATCH 2/5] lib/dlock-list: Add _

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Date:	Tue,  7 Jun 2016 15:35:52 -0400
From:	Waiman Long <Waiman.Long@....com>
To:	Alexander Viro <viro@...iv.linux.org.uk>, Jan Kara <jack@...e.com>,
	Jeff Layton <jlayton@...chiereds.net>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Tejun Heo <tj@...nel.org>,
	Christoph Lameter <cl@...ux-foundation.org>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Andi Kleen <andi@...stfloor.org>,
	Dave Chinner <dchinner@...hat.com>,
	Boqun Feng <boqun.feng@...il.com>,
	Scott J Norton <scott.norton@....com>,
	Douglas Hatch <doug.hatch@....com>,
	Waiman Long <Waiman.Long@....com>
Subject: [RESEND PATCH 2/5] lib/dlock-list: Add __percpu modifier for parameters

From: Boqun Feng <boqun.feng@...il.com>

Add __percpu modifier properly to help:

1.	Differ pointers to actual structures with those to percpu
	structures, which could improve readability.

2. 	Prevent sparse from complaining about "different address spaces"

Signed-off-by: Boqun Feng <boqun.feng@...il.com>
Signed-off-by: Waiman Long <Waiman.Long@....com>
---
 include/linux/dlock-list.h |   18 ++++++++++--------
 lib/dlock-list.c           |    5 +++--
 2 files changed, 13 insertions(+), 10 deletions(-)

diff --git a/include/linux/dlock-list.h b/include/linux/dlock-list.h
index 43355f8..a8e1fd2 100644
--- a/include/linux/dlock-list.h
+++ b/include/linux/dlock-list.h
@@ -108,7 +108,8 @@ static inline void init_dlock_list_node(struct dlock_list_node *node)
 	node->lockptr = NULL;
 }
 
-static inline void free_dlock_list_head(struct dlock_list_head **pdlock_head)
+static inline void
+free_dlock_list_head(struct dlock_list_head __percpu **pdlock_head)
 {
 	free_percpu(*pdlock_head);
 	*pdlock_head = NULL;
@@ -117,7 +118,7 @@ static inline void free_dlock_list_head(struct dlock_list_head **pdlock_head)
 /*
  * Check if all the per-cpu lists are empty
  */
-static inline bool dlock_list_empty(struct dlock_list_head *dlock_head)
+static inline bool dlock_list_empty(struct dlock_list_head __percpu *dlock_head)
 {
 	int cpu;
 
@@ -134,7 +135,7 @@ static inline bool dlock_list_empty(struct dlock_list_head *dlock_head)
  * Return: true if the entry is found, false if all the lists exhausted
  */
 static __always_inline bool
-__dlock_list_next_cpu(struct dlock_list_head *head,
+__dlock_list_next_cpu(struct dlock_list_head __percpu *head,
 		      struct dlock_list_state *state)
 {
 	if (state->lock)
@@ -172,7 +173,7 @@ next_cpu:
  *
  * Return: true if the next entry is found, false if all the entries iterated
  */
-static inline bool dlock_list_iterate(struct dlock_list_head *head,
+static inline bool dlock_list_iterate(struct dlock_list_head __percpu *head,
 				      struct dlock_list_state *state)
 {
 	/*
@@ -200,8 +201,9 @@ static inline bool dlock_list_iterate(struct dlock_list_head *head,
  *
  * Return: true if the next entry is found, false if all the entries iterated
  */
-static inline bool dlock_list_iterate_safe(struct dlock_list_head *head,
-					   struct dlock_list_state *state)
+static inline bool
+dlock_list_iterate_safe(struct dlock_list_head __percpu *head,
+			struct dlock_list_state *state)
 {
 	/*
 	 * Find next entry
@@ -226,8 +228,8 @@ static inline bool dlock_list_iterate_safe(struct dlock_list_head *head,
 }
 
 extern void dlock_list_add(struct dlock_list_node *node,
-			  struct dlock_list_head *head);
+			   struct dlock_list_head __percpu *head);
 extern void dlock_list_del(struct dlock_list_node *node);
-extern int  init_dlock_list_head(struct dlock_list_head **pdlock_head);
+extern int  init_dlock_list_head(struct dlock_list_head __percpu **pdlock_head);
 
 #endif /* __LINUX_DLOCK_LIST_H */
diff --git a/lib/dlock-list.c b/lib/dlock-list.c
index 84d4623..e1a1930 100644
--- a/lib/dlock-list.c
+++ b/lib/dlock-list.c
@@ -27,7 +27,7 @@ static struct lock_class_key dlock_list_key;
 /*
  * Initialize the per-cpu list head
  */
-int init_dlock_list_head(struct dlock_list_head **pdlock_head)
+int init_dlock_list_head(struct dlock_list_head __percpu **pdlock_head)
 {
 	struct dlock_list_head *dlock_head;
 	int cpu;
@@ -53,7 +53,8 @@ int init_dlock_list_head(struct dlock_list_head **pdlock_head)
  * function is called. However, deletion may be done by a different CPU.
  * So we still need to use a lock to protect the content of the list.
  */
-void dlock_list_add(struct dlock_list_node *node, struct dlock_list_head *head)
+void dlock_list_add(struct dlock_list_node *node,
+		    struct dlock_list_head __percpu *head)
 {
 	struct dlock_list_head *myhead;
 
-- 
1.7.1