[PATCH v2 07/20] rbtree: move some implementation details from rbtree.h to rbtree.c

[Praveen Kumar <kpraveen.lkml@gmail.com>]

rbtree users must use the documented APIs to manipulate the tree
structure.  Low-level helpers to manipulate node colors and parenthood are
not part of that API, so move them to lib/rbtree.c

Signed-off-by: Michel Lespinasse <walken@google.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Acked-by: David Woodhouse <David.Woodhouse@intel.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Daniel Santos <daniel.santos@pobox.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
[Linux commit bf7ad8eeab995710c766df49c9c69a8592ca0216]

Ported to Xen.

Signed-off-by: Praveen Kumar <kpraveen.lkml@gmail.com>
---
 xen/common/rbtree.c      | 20 +++++++++++++++++++-
 xen/include/xen/rbtree.h | 29 +++++++----------------------
 2 files changed, 26 insertions(+), 23 deletions(-)

diff --git a/xen/common/rbtree.c b/xen/common/rbtree.c
index 2561dbc7d9..49f73e2461 100644
--- a/xen/common/rbtree.c
+++ b/xen/common/rbtree.c
@@ -22,6 +22,24 @@
 #include <xen/types.h>
 #include <xen/rbtree.h>
 
+#define    RB_RED    0
+#define    RB_BLACK  1
+
+#define rb_color(r)     ((r)->__rb_parent_color & 1)
+#define rb_is_red(r)    (!rb_color(r))
+#define rb_is_black(r)  rb_color(r)
+#define rb_set_red(r)   do { (r)->__rb_parent_color &= ~1; } while (0)
+#define rb_set_black(r) do { (r)->__rb_parent_color |= 1; } while (0)
+
+static inline void rb_set_parent(struct rb_node *rb, struct rb_node *p)
+{
+    rb->__rb_parent_color = rb_color(rb) | (unsigned long)p;
+}
+static inline void rb_set_color(struct rb_node *rb, int color)
+{
+    rb->__rb_parent_color = (rb->__rb_parent_color & ~1) | color;
+}
+
 static void __rb_rotate_left(struct rb_node *node, struct rb_root *root)
 {
     struct rb_node *right = node->rb_right;
@@ -255,7 +273,7 @@ void rb_erase(struct rb_node *node, struct rb_root *root)
             rb_set_parent(old->rb_right, node);
         }
 
-        node->rb_parent_color = old->rb_parent_color;
+        node->__rb_parent_color = old->__rb_parent_color;
         node->rb_left = old->rb_left;
 
         rb_set_parent(old->rb_left, node);
diff --git a/xen/include/xen/rbtree.h b/xen/include/xen/rbtree.h
index f74b68ce62..89df40afd0 100644
--- a/xen/include/xen/rbtree.h
+++ b/xen/include/xen/rbtree.h
@@ -21,9 +21,7 @@
 
 struct rb_node
 {
-    unsigned long  rb_parent_color;
-#define RB_RED  0
-#define RB_BLACK 1
+    unsigned long  __rb_parent_color;
     struct rb_node *rb_right;
     struct rb_node *rb_left;
 };
@@ -33,21 +31,7 @@ struct rb_root
     struct rb_node *rb_node;
 };
 
-#define rb_parent(r)   ((struct rb_node *)((r)->rb_parent_color & ~3))
-#define rb_color(r)   ((r)->rb_parent_color & 1)
-#define rb_is_red(r)   (!rb_color(r))
-#define rb_is_black(r) rb_color(r)
-#define rb_set_red(r)  do { (r)->rb_parent_color &= ~1; } while (0)
-#define rb_set_black(r)  do { (r)->rb_parent_color |= 1; } while (0)
-
-static inline void rb_set_parent(struct rb_node *rb, struct rb_node *p)
-{
-    rb->rb_parent_color = (rb->rb_parent_color & 3) | (unsigned long)p;
-}
-static inline void rb_set_color(struct rb_node *rb, int color)
-{
-    rb->rb_parent_color = (rb->rb_parent_color & ~1) | color;
-}
+#define rb_parent(r)   ((struct rb_node *)((r)->__rb_parent_color & ~3))
 
 #define RB_ROOT (struct rb_root) { NULL, }
 #define rb_entry(ptr, type, member) container_of(ptr, type, member)
@@ -55,9 +39,10 @@ static inline void rb_set_color(struct rb_node *rb, int color)
 #define RB_EMPTY_ROOT(root)  ((root)->rb_node == NULL)
 
 /* 'empty' nodes are nodes that are known not to be inserted in an rbree */
-#define RB_EMPTY_NODE(node)  ((node)->rb_parent_color == (unsigned long)(node))
-#define RB_CLEAR_NODE(node)  ((node)->rb_parent_color = (unsigned long)(node))
-
+#define RB_EMPTY_NODE(node)  \
+    ((node)->__rb_parent_color == (unsigned long)(node))
+#define RB_CLEAR_NODE(node)  \
+    ((node)->__rb_parent_color = (unsigned long)(node))
 
 extern void rb_insert_color(struct rb_node *, struct rb_root *);
 extern void rb_erase(struct rb_node *, struct rb_root *);
@@ -75,7 +60,7 @@ extern void rb_replace_node(struct rb_node *victim, struct rb_node *new,
 static inline void rb_link_node(struct rb_node * node, struct rb_node * parent,
                                 struct rb_node ** rb_link)
 {
-    node->rb_parent_color = (unsigned long )parent;
+    node->__rb_parent_color = (unsigned long )parent;
     node->rb_left = node->rb_right = NULL;
 
     *rb_link = node;
-- 
2.12.0


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