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: 5 files changed, 281 insertions(+), 607 deletions(-) A git tree is also available at: git://git.infradead.org/users/hch/misc.git migrate_vma-cleanup.2 Gitweb: http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/migrate_vma-cleanup.2 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