Hi Jérôme, Ben and Jason, below is a series against the hmm tree which starts revamping the migrate_vma functionality. The prime idea is to export three slightly lower level functions and thus avoid the need for migrate_vma_ops callbacks. Diffstat: 7 files changed, 282 insertions(+), 614 deletions(-) A git tree is also available at: git://git.infradead.org/users/hch/misc.git migrate_vma-cleanup.3 Gitweb: http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/migrate_vma-cleanup.3 Changes since v2: - don't unmap pages when returning 0 from nouveau_dmem_migrate_to_ram - minor style fixes - add a new patch to remove CONFIG_MIGRATE_VMA_HELPER Changes since v1: - fix a few whitespace issues - drop the patch to remove MIGRATE_PFN_WRITE for now - various spelling fixes - clear cpages and npages in migrate_vma_setup - fix the nouveau_dmem_fault_copy_one return value - minor improvements to some nouveau internal calling conventions