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Subject[PATCH 2/8] trace/trace_stat: use rbtree postorder iteration helper instead of opencoding
Date
Use rbtree_postorder_for_each_entry_safe() to destroy the rbtree instead
of opencoding an alternate postorder iteration that modifies the tree

Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com>
---
kernel/trace/trace_stat.c | 42 ++++++------------------------------------
1 file changed, 6 insertions(+), 36 deletions(-)

diff --git a/kernel/trace/trace_stat.c b/kernel/trace/trace_stat.c
index 847f88a..fa53acc 100644
--- a/kernel/trace/trace_stat.c
+++ b/kernel/trace/trace_stat.c
@@ -43,46 +43,16 @@ static DEFINE_MUTEX(all_stat_sessions_mutex);
/* The root directory for all stat files */
static struct dentry *stat_dir;

-/*
- * Iterate through the rbtree using a post order traversal path
- * to release the next node.
- * It won't necessary release one at each iteration
- * but it will at least advance closer to the next one
- * to be released.
- */
-static struct rb_node *release_next(struct tracer_stat *ts,
- struct rb_node *node)
+static void __reset_stat_session(struct stat_session *session)
{
- struct stat_node *snode;
- struct rb_node *parent = rb_parent(node);
-
- if (node->rb_left)
- return node->rb_left;
- else if (node->rb_right)
- return node->rb_right;
- else {
- if (!parent)
- ;
- else if (parent->rb_left == node)
- parent->rb_left = NULL;
- else
- parent->rb_right = NULL;
+ struct stat_node *snode, *n;

- snode = container_of(node, struct stat_node, node);
- if (ts->stat_release)
- ts->stat_release(snode->stat);
+ rbtree_postorder_for_each_entry_safe(snode, n, &session->stat_root,
+ node) {
+ if (session->ts->stat_release)
+ session->ts->stat_release(snode->stat);
kfree(snode);
-
- return parent;
}
-}
-
-static void __reset_stat_session(struct stat_session *session)
-{
- struct rb_node *node = session->stat_root.rb_node;
-
- while (node)
- node = release_next(session->ts, node);

session->stat_root = RB_ROOT;
}
--
1.8.4.2


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