I can do that.
I was thinking that the answer you get from radix_tree_tag_get() may be invalid
if the tag chain is being modified as you read it. So if you do:
rcu_read_lock()
...
x = radix_tree_tag_get(r, i, t);
...
y = radix_tree_tag_get(r, i, t);
...
rcu_read_unlock()
Then you can't guarantee that x == y, even though you were holding the RCU read
lock.
As you suggested, I'll try and come up with a comment modification to this
effect.
David
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