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Re: [dm-devel] idr_get_new_exact ?


On 09/23/2010 01:42 PM, Paul Mundt wrote:
> On Mon, Sep 20, 2010 at 11:26:47PM +0200, Tejun Heo wrote:
>> Hello,
>> On 09/20/2010 10:35 PM, Roland Dreier wrote:
>>> Looks fine to me as an improvement over the status quo, but I wonder how
>>> many of these places could use the radix_tree stuff instead?  If you're
>>> not using the ability of the idr code to assign an id for you, then it
>>> seems the radix_tree API is a better fit.
>> I agree.  Wouldn't those users better off simply using radix tree?
> It could go either way. I was about to write the same function when
> playing with it for IRQ mapping, the idea being to propagate the initial
> tree with sparse static vectors and then switch over to dynamic IDs for
> virtual IRQ creation. I ended up going with a radix tree for other
> reasons, though.

I see.  If there are use cases where fixed and dynamic IDs need to be
mixed, no objection from me.



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