On Fri, Jun 07, 2019 at 05:14:52PM -0700, Ralph Campbell wrote: > HMM defines its own struct hmm_update which is passed to the > sync_cpu_device_pagetables() callback function. This is > sufficient when the only action is to invalidate. However, > a device may want to know the reason for the invalidation and > be able to see the new permissions on a range, update device access > rights or range statistics. Since sync_cpu_device_pagetables() > can be called from try_to_unmap(), the mmap_sem may not be held > and find_vma() is not safe to be called. > Pass the struct mmu_notifier_range to sync_cpu_device_pagetables() > to allow the full invalidation information to be used. > > Signed-off-by: Ralph Campbell <rcampbell@xxxxxxxxxx> > --- > > I'm sending this out now since we are updating many of the HMM APIs > and I think it will be useful. This make so much sense, I'd like to apply this in hmm.git, is there any objection? Jason
