On Fri, 11 Jul 2014 00:53:26 +0300 Oded Gabbay <oded.gabbay@xxxxxxxxx> wrote: > From: Andrew Lewycky <Andrew.Lewycky@xxxxxxx> > > 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. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>