* Stefan Hajnoczi [off-list ref] [2011-09-20 18:03:10]:

On Tue, Sep 20, 2011 at 05:30:40PM +0530, Srikar Dronamraju wrote:

quoted

+static void build_probe_list(struct inode *inode, struct list_head *head)
+{
+	struct uprobe *uprobe;
+	struct rb_node *n;
+	unsigned long flags;
+
+	n = uprobes_tree.rb_node;
+	spin_lock_irqsave(&uprobes_treelock, flags);

Not sure whether grabbing root.rb_node outside the spinlock is safe?  If
the tree is rotated on another CPU you could catch and out-of-date node?

Agree that its better to access the node in the spinlock.
Shall correct this.
 

quoted

+static void dec_mm_uprobes_count(struct vm_area_struct *vma,
+		struct inode *inode)
+{
+	struct uprobe *uprobe;
+	struct rb_node *n;
+	unsigned long flags;
+
+	n = uprobes_tree.rb_node;
+	spin_lock_irqsave(&uprobes_treelock, flags);

Same here.

Okay.

-- 
Thanks and Regards
Srikar

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