On Thu, Jul 24, 2014 at 11:34:27AM +0200, Joerg Roedel wrote: > On Wed, Jul 23, 2014 at 10:49:55AM -0700, Olav Haugan wrote: > > Joerg, can you comment on what you envisioned when you suggested that we > > add the fallback? > > > > The problem is that we already have tons of IOMMU drivers in the tree > which don't provide these call-backs. So adding this API extension > without a fall-back that works for these drivers too would fragment the > functionality between different IOMMU drivers in an inacceptable way and > undermine the purpose of a generic API. But we only care about in-tree drivers anyway, so we can equally well just point all drivers to the generic implementation in the same patch that adds this new function. The end result will be the same, but it will keep the core function simpler (and more consistent with the other core functions). Thierry
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