[PATCH 8/9] iommu: add support for ARM Ltd. System MMU architecture

Joerg Roedel joro at 8bytes.org
Fri Jun 21 11:30:44 EDT 2013

On Fri, Jun 21, 2013 at 04:00:06PM +0100, Will Deacon wrote:
> Damn, I was hoping to avoid locking on the map path. In fact, this is a good
> argument to go with your suggestion below (otherwise I'd need to use
> reader/writer locks which seem to be frowned on).

You should look into using rcu-lists instead. You still need a lock, but
only when you actually manipulating the lists. For traversing them it is
sufficient to take the rcu_read_lock() which has very low overhead.


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