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Subject[PATCH] rbtree: fix jffs2 build issue due to renamed __rb_parent_color field
When renaming rb_parent_color into __rb_parent_color to highlight the
fact that people aren't expected to directly manipulate this, I broke
the jffs2 build which was doing such direct manipulation in
fs/jffs2/readinode.c . Fix this and add a comment explaining why
this direct use is safe here.

Signed-off-by: Michel Lespinasse <walken@google.com>
---
fs/jffs2/readinode.c | 6 ++++--
1 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/fs/jffs2/readinode.c b/fs/jffs2/readinode.c
index dc0437e..b00fc50 100644
--- a/fs/jffs2/readinode.c
+++ b/fs/jffs2/readinode.c
@@ -395,7 +395,9 @@ static int jffs2_add_tn_to_tree(struct jffs2_sb_info *c,

/* Trivial function to remove the last node in the tree. Which by definition
has no right-hand -- so can be removed just by making its only child (if
- any) take its place under its parent. */
+ any) take its place under its parent. Note that we don't maintain the
+ usual rbtree invariants as there won't be further insert or erase
+ operations on the tree.*/
static void eat_last(struct rb_root *root, struct rb_node *node)
{
struct rb_node *parent = rb_parent(node);
@@ -414,7 +416,7 @@ static void eat_last(struct rb_root *root, struct rb_node *node)
*link = node->rb_left;
/* Colour doesn't matter now. Only the parent pointer. */
if (node->rb_left)
- node->rb_left->rb_parent_color = node->rb_parent_color;
+ node->rb_left->__rb_parent_color = node->__rb_parent_color;
}

/* We put this in reverse order, so we can just use eat_last */
--
1.7.7.3

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