On Fri, 11 Jul 2014 00:53:26 +0300 Oded Gabbay <oded.gabbay at gmail.com> wrote:
> From: Andrew Lewycky <Andrew.Lewycky at amd.com> > > This patch changes the location of the mmu_notifier_invalidate_page function > call inside try_to_unmap_one. The mmu_notifier_invalidate_page function > call tells the IOMMU that a pgae should be invalidated. > > The location is changed from after releasing the physical page to > before releasing the physical page. > > This change should prevent the bug that would occur in the > (rare) case where the GPU attempts to access a page while the CPU > attempts to swap out that page (or discard it if it is not dirty). um OK, but what is the effect on all the other mmu_notifier_ops.invalidate_page() implementations? Please spell this out in full detail within the changelog and be sure to cc the affected maintainers.