[Xen-devel] [PATCH v4 04/17] rbtree: move some implementation details from rbtree.h to rbtree.c

[Praveen Kumar <kpraveen.lkml@xxxxxxxxx>]

From: Michel Lespinasse <walken@xxxxxxxxxx>

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@xxxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Acked-by: David Woodhouse <David.Woodhouse@xxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Daniel Santos <daniel.santos@xxxxxxxxx>
Cc: Jens Axboe <axboe@xxxxxxxxx>
Cc: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Signed-off-by: David Woodhouse <David.Woodhouse@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
[Linux commit bf7ad8eeab995710c766df49c9c69a8592ca0216]

Ported to Xen.

Signed-off-by: Praveen Kumar <kpraveen.lkml@xxxxxxxxx>
---
 xen/common/rbtree.c      | 20 +++++++++++++++++++-
 xen/include/xen/rbtree.h | 34 +++++++++-------------------------
 2 files changed, 28 insertions(+), 26 deletions(-)

diff --git a/xen/common/rbtree.c b/xen/common/rbtree.c
index e2a665118b..1ed5943c5a 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;
@@ -254,7 +272,7 @@ 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 4249752dcb..c3af3db5d0 100644
--- a/xen/include/xen/rbtree.h
+++ b/xen/include/xen/rbtree.h
@@ -19,36 +19,18 @@
 #ifndef __RBTREE_H__
 #define __RBTREE_H__
 
-struct rb_node
-{
-       unsigned long  rb_parent_color;
-#define        RB_RED          0
-#define        RB_BLACK        1
+struct rb_node {
+       unsigned long  __rb_parent_color;
        struct rb_node *rb_right;
        struct rb_node *rb_left;
 } __attribute__((aligned(sizeof(long))));
     /* The alignment might seem pointless, but allegedly CRIS needs it */
 
-struct rb_root
-{
+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)
@@ -56,8 +38,10 @@ 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 +59,7 @@ 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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