Re: [PATCH v5 3.1.0-rc4-tip 4/26] uprobes: Define hooks formmap/munmap.

[Stefan Hajnoczi]

On Tue, Sep 20, 2011 at 05:30:40PM +0530, Srikar Dronamraju wrote:
> +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the tree is rotated on another CPU you could catch and out-of-date node?

> +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.

Stefan
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