On Wed, Jan 28, 2015 at 02:35:24PM +0000, Will Deacon wrote:
> On Tue, Jan 27, 2015 at 12:08:57AM +0000, Joerg Roedel wrote:
> > @@ -51,6 +51,7 @@ struct iommu_group {
> > void (*iommu_data_release)(void *iommu_data);
> > char *name;
> > int id;
> > + unsigned dev_cnt;
>
> Is this actually used on a fast path, or can we just inspect the list of
> devices on the group instead?
Not really a fast path, but we have to hold the group mutex while
traversing the list, which could hurt performance somewhere else. Are
these 4 bytes a problem?
Joerg
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